Update version to v1.2.0

Android/app/proguard-rules.pro

@@ -1,4 +1,6 @@
 -keeppackagenames **
 -keep class skip.** { *; }
--keep class com.sun.jna.Pointer { *; }
+-keep class com.sun.jna.** { *; }
+-keep class * implements com.sun.jna.** { *; }
 -keep class sats.price.** { *; }
+-dontwarn java.awt.**

Darwin/Entitlements.plist

@@ -2,5 +2,9 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
 </dict>
 </plist>

Darwin/SatsPrice.xcodeproj/project.pbxproj

@@ -199,26 +199,30 @@
 		499CD4422AC5B799001AE8D8 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CURRENT_PROJECT_VERSION = 10;
 				DEVELOPMENT_TEAM = S99A5B637C;
+				ENABLE_APP_SANDBOX = YES;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_KEY_CFBundleDisplayName = SatsPrice;
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				LD_RUNPATH_SEARCH_PATHS = "@executable_path/Frameworks";
 				"LD_RUNPATH_SEARCH_PATHS[sdk=macosx*]" = "@executable_path/../Frameworks";
-				MARKETING_VERSION = 1.0.0;
+				MARKETING_VERSION = 1.2.0;
 			};
 			name = Debug;
 		};
 		499CD4432AC5B799001AE8D8 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CURRENT_PROJECT_VERSION = 10;
 				DEVELOPMENT_TEAM = S99A5B637C;
+				ENABLE_APP_SANDBOX = YES;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_KEY_CFBundleDisplayName = SatsPrice;
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				LD_RUNPATH_SEARCH_PATHS = "@executable_path/Frameworks";
 				"LD_RUNPATH_SEARCH_PATHS[sdk=macosx*]" = "@executable_path/../Frameworks";
-				MARKETING_VERSION = 1.0.0;
+				MARKETING_VERSION = 1.2.0;
 			};
 			name = Release;
 		};

Package.swift

@@ -15,10 +15,23 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://source.skip.tools/skip.git", from: "1.0.7"),
-        .package(url: "https://source.skip.tools/skip-ui.git", from: "1.0.0")
+        .package(url: "https://source.skip.tools/skip-ui.git", from: "1.0.0"),
+        .package(url: "https://source.skip.tools/skip-foundation.git", from: "1.0.0"),
+        .package(url: "https://source.skip.tools/skip-model.git", from: "1.0.0"),
+        .package(url: "https://source.skip.tools/skip-sql.git", "0.0.0"..<"2.0.0")
     ],
     targets: [
-        .target(name: "SatsPrice", dependencies: [.product(name: "SkipUI", package: "skip-ui")], resources: [.process("Resources")], plugins: [.plugin(name: "skipstone", package: "skip")]),
+        .target(
+            name: "SatsPrice",
+            dependencies: [
+                .product(name: "SkipUI", package: "skip-ui"),
+                .product(name: "SkipFoundation", package: "skip-foundation"),
+                .product(name: "SkipModel", package: "skip-model"),
+                .product(name: "SkipSQLPlus", package: "skip-sql")
+            ],
+            resources: [.process("Resources")],
+            plugins: [.plugin(name: "skipstone", package: "skip")]
+        ),
         .testTarget(name: "SatsPriceTests", dependencies: ["SatsPrice", .product(name: "SkipTest", package: "skip")], resources: [.process("Resources")], plugins: [.plugin(name: "skipstone", package: "skip")]),
     ]
 )

README.md

@@ -1,12 +1,41 @@
+<div align="center">
+
+<img src="./docs/assets/satsprice-logo.png" alt="SatsPrice Logo" title="SatsPrice logo" width="256"/>
+
 # SatsPrice
 
-This app fetches the price of Bitcoin relative to common ISO currencies from multiple sources, and converts inputted amounts between Sats, BTC, and the selected ISO currency.
+This app fetches the price of Bitcoin relative to common fiat currencies from multiple sources, and converts inputted amounts between Sats, BTC, and the selected fiat currency.
+
+[![GitHub downloads](https://img.shields.io/github/downloads/tyiu/sats-price/total?label=Downloads&labelColor=27303D&color=0D1117&logo=github&logoColor=FFFFFF&style=flat)](https://github.com/tyiu/sats-price/releases)
+
+[![Last Version](https://img.shields.io/github/release/tyiu/sats-price?maxAge=3600&label=Stable&labelColor=06599d&color=043b69)](https://github.com/tyiu/sats-price)
+[![License: GPL-3.0](https://img.shields.io/github/license/tyiu/sats-price?labelColor=27303D&color=0877d2)](/LICENSE)
+
+## Download and Install
+
+[<img src="./docs/assets/download_on_apple.svg"
+alt="Download on the Apple App Store"
+height="70">](https://apps.apple.com/app/satsprice/id6478230475)
+[<img src="./docs/assets/download_on_zapstore.svg"
+alt="Get it on Zap Store"
+height="70">](https://github.com/zapstore/zapstore/releases)
+[<img src="./docs/assets/download_on_obtainium.png"
+alt="Get it on Obtaininum"
+height="70">](https://github.com/ImranR98/Obtainium)
+[<img src="./docs/assets/download_on_github.svg" alt="Get it on GitHub"
+height="70">](https://github.com/tyiu/sats-price/releases)
+
+## Supported Platforms
+
+iOS 16.0+ • macOS 13.0+ • Android 10.0+
+
+</div>
+
+## Building
 
 This is a free [Skip](https://skip.tools) dual-platform app project.
 It builds a native app for both iOS and Android.
 
-## Building
-
 This project is both a stand-alone Swift Package Manager module,
 as well as an Xcode project that builds and transpiles the project
 into a Kotlin Gradle project for Android using the Skip plugin.
@@ -48,3 +77,10 @@ Android Studio's logcat tab for the transpiled Kotlin app.
 This project depends on [Skip](https://skip.tools) to build as a multi-platform app.
 
 The [Bitcoin Calculator](https://www.flaticon.com/free-icons/bitcoin-calculator) icon was created by Icon home and licensed as free for personal and commercial use with attribution.
+
+The following free APIs are used:
+- Coinbase
+  - [Get Exchange Rates](https://docs.cdp.coinbase.com/coinbase-app/docs/api-exchange-rates#get-exchange-rates)
+  - [Get Spot Price](https://docs.cdp.coinbase.com/coinbase-app/docs/api-prices#get-spot-price)
+- CoinGecko
+  - [Coin Price by IDs](https://docs.coingecko.com/reference/simple-price)

Skip.env

@@ -11,10 +11,10 @@ PRODUCT_NAME = SatsPrice
 PRODUCT_BUNDLE_IDENTIFIER = xyz.tyiu.SatsPrice
 
 // The semantic version of the app
-MARKETING_VERSION = 1.0.0
+MARKETING_VERSION = 1.2.0
 
 // The build number specifying the internal app version
-CURRENT_PROJECT_VERSION = 7
+CURRENT_PROJECT_VERSION = 10
 
 // The package name for the Android entry point, referenced by the AndroidManifest.xml
 ANDROID_PACKAGE_NAME = sats.price

Sources/SatsPrice/ContentView.swift

@@ -6,71 +6,53 @@ import Combine
 import SwiftUI
 
 public struct ContentView: View {
-    @ObservedObject private var satsViewModel = SatsViewModel()
+    let model: SatsPriceModel
 
-    @State private var priceSource: PriceSource
+    @StateObject private var satsViewModel: SatsViewModel
 
     private let dateFormatter: DateFormatter
 
-    private let priceFetcherDelegator: PriceFetcherDelegator
+    init(model: SatsPriceModel) {
+        self.model = model
+
+        _satsViewModel = StateObject<SatsViewModel>(wrappedValue: SatsViewModel(model: model))
 
-    init(_ priceSource: PriceSource) {
         dateFormatter = DateFormatter()
         dateFormatter.dateStyle = .short
         dateFormatter.timeStyle = .short
-
-        self.priceSource = priceSource
-        priceFetcherDelegator = PriceFetcherDelegator(priceSource)
     }
 
-    @MainActor
+    public var addCurrencyView: some View {
-    func updatePrice() async {
+        NavigationLink(
-        do {
+            destination: {
-            guard let price = try await priceFetcherDelegator.convertBTC(toCurrency: satsViewModel.selectedCurrency) else {
+                CurrencyPickerView(satsViewModel: satsViewModel)
-                satsViewModel.btcToCurrencyString = ""
+            },
-                return
+            label: {
+                Text("Change Currencies")
             }
-
+        )
-            satsViewModel.btcToCurrencyString = "\(price)"
-        } catch {
-            satsViewModel.btcToCurrencyString = ""
-        }
-        satsViewModel.lastUpdated = Date.now
     }
 
     public var body: some View {
         NavigationStack {
             Form {
                 Section {
-                    Picker("Price Source", selection: $priceSource) {
+                    Picker("Price Source", selection: $satsViewModel.priceSource) {
                         ForEach(PriceSource.allCases, id: \.self) {
                             Text($0.description)
                         }
                     }
 
-                    Picker("Currency", selection: $satsViewModel.selectedCurrency) {
-                        ForEach(satsViewModel.currencies, id: \.self) {
-                            if let localizedCurrency = Locale.current.localizedString(forCurrencyCode: $0.identifier) {
-                                Text("\($0.identifier) - \(localizedCurrency)")
-                            } else {
-                                Text($0.identifier)
-                            }
-                        }
-                    }
-#if os(iOS) || SKIP
-                    .pickerStyle(.navigationLink)
-#endif
-
                     HStack {
-                        TextField("1 BTC to \(satsViewModel.selectedCurrency.identifier)", text: $satsViewModel.btcToCurrencyString)
+                        TextField("1 BTC to \(satsViewModel.currentCurrency.identifier)", text: satsViewModel.btcToCurrencyString(for: satsViewModel.currentCurrency))
-                            .disabled(priceSource != .manual)
+                            .disabled(satsViewModel.priceSource != .manual)
 #if os(iOS) || SKIP
                             .keyboardType(.decimalPad)
 #endif
-                        if priceSource != .manual {
+                        if satsViewModel.priceSource != .manual {
                             Button(action: {
                                 Task {
-                                    await updatePrice()
+                                    await satsViewModel.updatePrice()
                                 }
                             }) {
                                 Image(systemName: "arrow.clockwise.circle")
@@ -78,62 +60,70 @@ public struct ContentView: View {
                         }
                     }
                 } header: {
-                    Text("1 BTC to \(satsViewModel.selectedCurrency.identifier)")
+                    Text("1 BTC to \(satsViewModel.currentCurrency.identifier)")
                 } footer: {
-                    if priceSource != .manual, let lastUpdated = satsViewModel.lastUpdated {
+                    if satsViewModel.priceSource != .manual, let lastUpdated = satsViewModel.lastUpdated {
                         Text("Last updated: \(dateFormatter.string(from: lastUpdated))")
                     }
                 }
 
                 Section {
-                    TextField("Sats", text: $satsViewModel.satsString)
+                    HStack {
+                        Text("Sats")
+                        TextField("Sats", text: $satsViewModel.satsString)
 #if os(iOS) || SKIP
-                        .keyboardType(.numberPad)
+                            .keyboardType(.numberPad)
 #endif
-                } header: {
+                    }
-                    Text("Sats")
+
+                    HStack {
+                        Text("BTC")
+                        TextField("BTC", text: $satsViewModel.btcString)
+#if os(iOS) || SKIP
+                            .keyboardType(.decimalPad)
+#endif
+                    }
                 } footer: {
                     if satsViewModel.exceedsMaximum {
-                        Text("2100000000000000 sats is the maximum.")
+                        Text("\(SatsViewModel.MAXIMUM_BTC.formatBTCString()) BTC is the maximum.")
                     }
                 }
 
                 Section {
-                    TextField("BTC", text: $satsViewModel.btcString)
+                    HStack {
+                        Text(satsViewModel.currentCurrency.identifier)
+                        TextField(satsViewModel.currentCurrency.identifier, text: satsViewModel.currencyValueString(for: satsViewModel.currentCurrency))
 #if os(iOS) || SKIP
-                        .keyboardType(.decimalPad)
+                            .keyboardType(.decimalPad)
 #endif
-                } header: {
+                    }
-                    Text("BTC")
+
-                } footer: {
+                    if satsViewModel.priceSource != .manual {
-                    if satsViewModel.exceedsMaximum {
+                        ForEach(satsViewModel.selectedCurrencies.sorted { $0.identifier < $1.identifier }.filter { $0 != satsViewModel.currentCurrency }, id: \.identifier) { currency in
-                        Text("21000000 BTC is the maximum.")
+                            HStack {
+                                Text(currency.identifier)
+                                TextField(currency.identifier, text: satsViewModel.currencyValueString(for: currency))
+#if os(iOS) || SKIP
+                                    .keyboardType(.decimalPad)
+#endif
+                            }
+                            .tag(currency.identifier)
+                        }
                     }
                 }
 
-                Section {
+                if satsViewModel.priceSource != .manual {
-                    TextField(satsViewModel.selectedCurrency.identifier, text: $satsViewModel.currencyValueString)
+                    addCurrencyView
-#if os(iOS) || SKIP
-                        .keyboardType(.decimalPad)
-#endif
-                } header: {
-                    Text(satsViewModel.selectedCurrency.identifier)
                 }
             }
             .task {
-                await updatePrice()
+                await satsViewModel.pullSelectedCurrenciesFromDB()
+                await satsViewModel.updatePrice()
             }
-            .onChange(of: satsViewModel.selectedCurrency) { newCurrency in
+            .onChange(of: satsViewModel.priceSource) { newPriceSource in
                 satsViewModel.lastUpdated = nil
                 Task {
-                    await updatePrice()
+                    await satsViewModel.updatePrice()
-                }
-            }
-            .onChange(of: priceSource) { newPriceSource in
-                satsViewModel.lastUpdated = nil
-                priceFetcherDelegator.priceSource = newPriceSource
-                Task {
-                    await updatePrice()
                 }
             }
 #if os(macOS)
@@ -144,9 +134,6 @@ public struct ContentView: View {
 }
 
 #Preview {
-#if DEBUG
+    let satsPriceModel = try! SatsPriceModel(url: nil)
-    ContentView(.fake)
+    ContentView(model: satsPriceModel)
-#else
-    ContentView(.coinbase)
-#endif
 }

Sources/SatsPrice/CurrencyPickerView.swift

@@ -0,0 +1,85 @@
+// This is free software: you can redistribute and/or modify it
+// under the terms of the GNU General Public License 3.0
+// as published by the Free Software Foundation https://fsf.org
+//
+//  CurrencyPickerView.swift
+//  sats-price
+//
+//  Created by Terry Yiu on 11/10/24.
+//
+
+import SwiftUI
+
+struct CurrencyPickerView: View {
+    @ObservedObject var satsViewModel: SatsViewModel
+
+    var body: some View {
+        let currentCurrency = satsViewModel.currentCurrency
+
+        List {
+            Section("Current Currency") {
+                let currentCurrency = satsViewModel.currentCurrency
+                if let localizedCurrency = Locale.current.localizedString(forCurrencyCode: currentCurrency.identifier) {
+                    Text("\(currentCurrency.identifier) - \(localizedCurrency)")
+                } else {
+                    Text(currentCurrency.identifier)
+                }
+            }
+
+            if !satsViewModel.selectedCurrencies.isEmpty {
+                Section("Selected Currencies") {
+                    ForEach(satsViewModel.selectedCurrencies.filter { $0 != currentCurrency }.sorted { $0.identifier < $1.identifier }, id: \.identifier) { currency in
+                        Button(
+                            action: {
+                                satsViewModel.removeSelectedCurrency(currency)
+                            },
+                            label: {
+                                HStack {
+                                    Group {
+                                        if let localizedCurrency = Locale.current.localizedString(forCurrencyCode: currency.identifier) {
+                                            Text("\(currency.identifier) - \(localizedCurrency)")
+                                        } else {
+                                            Text(currency.identifier)
+                                        }
+                                    }
+                                    .frame(maxWidth: .infinity, alignment: .leading)
+
+                                    Image(systemName: "checkmark")
+                                }
+                            }
+                        )
+                        .buttonStyle(.plain)
+                    }
+                }
+            }
+
+            Section("Currencies") {
+                ForEach(satsViewModel.currencies.filter { $0 != currentCurrency && !satsViewModel.selectedCurrencies.contains($0) }, id: \.identifier) { currency in
+                    Button(
+                        action: {
+                            satsViewModel.addSelectedCurrency(currency)
+                        },
+                        label: {
+                            if let localizedCurrency = Locale.current.localizedString(forCurrencyCode: currency.identifier) {
+                                Text("\(currency.identifier) - \(localizedCurrency)")
+                            } else {
+                                Text(currency.identifier)
+                            }
+                        }
+                    )
+                    .buttonStyle(.plain)
+                }
+            }
+        }
+        .onDisappear(perform: {
+            Task {
+                await satsViewModel.updatePrice()
+            }
+        })
+    }
+}
+
+#Preview {
+    let satsPriceModel = try! SatsPriceModel(url: nil)
+    CurrencyPickerView(satsViewModel: SatsViewModel(model: satsPriceModel))
+}

Sources/SatsPrice/Model/SatsPriceModel.swift

@@ -0,0 +1,156 @@
+// This is free software: you can redistribute and/or modify it
+// under the terms of the GNU General Public License 3.0
+// as published by the Free Software Foundation https://fsf.org
+//
+//  SatsPriceModel.swift
+//  sats-price
+//
+//  Created by Terry Yiu on 11/15/24.
+//
+
+import Foundation
+import OSLog
+import Observation
+import SkipSQL
+
+public struct SelectedCurrency: Identifiable {
+    public var id: String {
+        currencyCode
+    }
+
+    public var currencyCode: String
+}
+
+/// Notification posted by the model when selected currencies change.
+extension Notification.Name {
+    public static var selectedCurrenciesDidChange: Notification.Name {
+        return Notification.Name("selectedCurrenciesChange")
+    }
+}
+
+/// Payload of `selectedCurrenciesDidChange` notifications.
+public struct SelectedCurrenciesChange {
+    public let inserts: [SelectedCurrency]
+    /// Nil set means all records were deleted.
+    public let deletes: Set<String>?
+
+    public init(inserts: [SelectedCurrency] = [], deletes: [String]? = []) {
+        self.inserts = inserts
+        self.deletes = deletes == nil ? nil : Set(deletes!)
+    }
+}
+
+public actor SatsPriceModel {
+    private let ctx: SQLContext
+    private var schemaInitializationResult: Result<Void, Error>?
+
+    public init(url: URL?) throws {
+        ctx = try SQLContext(path: url?.path ?? ":memory:", flags: [.readWrite, .create], logLevel: .info, configuration: .platform)
+    }
+
+    public func selectedCurrencies() throws -> [SelectedCurrency] {
+        do {
+            try initializeSchema()
+            let statement = try ctx.prepare(sql: "SELECT currencyCode FROM SelectedCurrency")
+            defer {
+                do {
+                    try statement.close()
+                } catch {
+                    logger.warning("Failed to close statement: \(error)")
+                }
+            }
+
+            var selectedCurrencies: [SelectedCurrency] = []
+
+            while try statement.next() {
+                let currencyCode = statement.string(at: 0) ?? ""
+                selectedCurrencies.append(SelectedCurrency(currencyCode: currencyCode))
+            }
+
+            return selectedCurrencies
+        } catch {
+            logger.error("Failed to get selected currencies from DB. Error: \(error)")
+            throw error
+        }
+    }
+
+    @discardableResult
+    public func insert(_ selectedCurrency: SelectedCurrency) throws -> [SelectedCurrency] {
+        try initializeSchema()
+        let statement = try ctx.prepare(sql: "INSERT INTO SelectedCurrency (currencyCode) VALUES (?)")
+        defer {
+            do {
+                try statement.close()
+            } catch {
+                logger.warning("Failed to close statement: \(error)")
+            }
+        }
+
+        var insertedItems: [SelectedCurrency] = []
+        try ctx.transaction {
+            statement.reset()
+            let values = Self.bindingValues(for: selectedCurrency)
+            try statement.update(parameters: values)
+
+            insertedItems.append(selectedCurrency)
+        }
+        NotificationCenter.default.post(name: .selectedCurrenciesDidChange, object: SelectedCurrenciesChange(inserts: insertedItems))
+        return insertedItems
+    }
+
+    private static func bindingValues(for selectedCurrency: SelectedCurrency) -> [SQLValue] {
+        return [
+            .text(selectedCurrency.currencyCode)
+        ]
+    }
+
+    @discardableResult
+    public func deleteSelectedCurrency(currencyCode: String) throws -> Int {
+        try initializeSchema()
+        try ctx.exec(sql: "DELETE FROM SelectedCurrency WHERE currencyCode = ?", parameters: [.text(currencyCode)])
+        NotificationCenter.default.post(name: .selectedCurrenciesDidChange, object: SelectedCurrenciesChange(deletes: [currencyCode]))
+        return Int(ctx.changes)
+    }
+
+    private func initializeSchema() throws {
+        switch schemaInitializationResult {
+        case .success:
+            return
+        case .failure(let failure):
+            throw failure
+        case nil:
+            break
+        }
+
+        do {
+            var currentVersion = try currentSchemaVersion()
+            currentVersion = try migrateSchema(v: Int64(1), current: currentVersion, ddl: """
+            CREATE TABLE SelectedCurrency (currencyCode TEXT PRIMARY KEY NOT NULL)
+            """)
+            // Future column additions, etc here...
+            schemaInitializationResult = .success(())
+        } catch {
+            schemaInitializationResult = .failure(error)
+            throw error
+        }
+    }
+
+    private func currentSchemaVersion() throws -> Int64 {
+        try ctx.exec(sql: "CREATE TABLE IF NOT EXISTS SchemaVersion (id INTEGER PRIMARY KEY, version INTEGER)")
+        try ctx.exec(sql: "INSERT OR IGNORE INTO SchemaVersion (id, version) VALUES (0, 0)")
+        return try ctx.query(sql: "SELECT version FROM SchemaVersion").first?.first?.integerValue ?? Int64(0)
+    }
+
+    private func migrateSchema(v version: Int64, current: Int64, ddl: String) throws -> Int64 {
+        guard current < version else {
+            return current
+        }
+        let startTime = Date.now
+        try ctx.transaction {
+            try ctx.exec(sql: ddl)
+            try ctx.exec(sql: "UPDATE SchemaVersion SET version = ?", parameters: [.integer(version)])
+        }
+        logger.log("Updated database schema to \(version) in \(Date.now.timeIntervalSince1970 - startTime.timeIntervalSince1970)")
+        return version
+    }
+}

Sources/SatsPrice/Network/CoinGeckoPriceFetcher.swift

@@ -23,6 +23,11 @@ class CoinGeckoPriceFetcher : PriceFetcher {
         "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=\(currency.identifier.lowercased())&precision=18"
     }
 
+    func urlString(toCurrencies currencies: [Locale.Currency]) -> String {
+        let currenciesString = currencies.map { $0.identifier.lowercased() }.joined(separator: ",")
+        return "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=\(currenciesString)&precision=18"
+    }
+
     func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal? {
         do {
             guard let urlComponents = URLComponents(string: urlString(toCurrency: currency)), let url = urlComponents.url else {
@@ -45,4 +50,43 @@ class CoinGeckoPriceFetcher : PriceFetcher {
             return nil
         }
     }
+
+    func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency : Decimal] {
+        do {
+            guard !currencies.isEmpty else {
+                return [:]
+            }
+
+            if currencies.count == 1, let currency = currencies.first {
+                guard let price = try await convertBTC(toCurrency: currency) else {
+                    return [:]
+                }
+
+                return [currency: price]
+            }
+
+            guard let urlComponents = URLComponents(string: urlString(toCurrencies: currencies)), let url = urlComponents.url else {
+                return [:]
+            }
+
+            let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
+
+            let priceResponse = try JSONDecoder().decode(CoinGeckoPriceResponse.self, from: data)
+
+            var results: [Locale.Currency : Decimal] = [:]
+            for currency in currencies {
+                if let price = priceResponse.bitcoin[currency.identifier.lowercased()] {
+#if !SKIP
+                    results[currency] = price
+#else
+                    results[currency] = Decimal(price)
+#endif
+                }
+            }
+
+            return results
+        } catch {
+            return [:]
+        }
+    }
 }

Sources/SatsPrice/Network/CoinbasePriceFetcher.swift

@@ -20,11 +20,22 @@ private struct CoinbasePrice: Codable {
     let currency: String
 }
 
+private struct CoinbaseExchangeRatesResponse: Codable {
+    let data: CoinbaseExchangeRatesResponseData
+}
+
+private struct CoinbaseExchangeRatesResponseData: Codable {
+    let currency: String
+    let rates: [String: String]
+}
+
 class CoinbasePriceFetcher : PriceFetcher {
     func urlString(toCurrency currency: Locale.Currency) -> String {
         "https://api.coinbase.com/v2/prices/BTC-\(currency.identifier)/spot"
     }
 
+    private static let urlStringForAllCurrencies: String = "https://api.coinbase.com/v2/exchange-rates?currency=BTC"
+
     func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal? {
         do {
             guard let urlComponents = URLComponents(string: urlString(toCurrency: currency)), let url = urlComponents.url else {
@@ -40,13 +51,57 @@ class CoinbasePriceFetcher : PriceFetcher {
                 return nil
             }
 
-            #if !SKIP
+#if !SKIP
             return Decimal(string: coinbasePrice.amount)
-            #else
+#else
             return Decimal(coinbasePrice.amount)
-            #endif
+#endif
         } catch {
             return nil
         }
     }
+
+    func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency : Decimal] {
+        do {
+            guard !currencies.isEmpty else {
+                return [:]
+            }
+
+            if currencies.count == 1, let currency = currencies.first {
+                guard let price = try await convertBTC(toCurrency: currency) else {
+                    return [:]
+                }
+
+                return [currency: price]
+            }
+
+            guard let urlComponents = URLComponents(string: CoinbasePriceFetcher.urlStringForAllCurrencies), let url = urlComponents.url else {
+                return [:]
+            }
+
+            let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
+
+            let coinbaseExchangeRatesResponse = try JSONDecoder().decode(CoinbaseExchangeRatesResponse.self, from: data)
+            let rates = coinbaseExchangeRatesResponse.data.rates
+
+            guard coinbaseExchangeRatesResponse.data.currency == "BTC" else {
+                return [:]
+            }
+
+            var results: [Locale.Currency : Decimal] = [:]
+            for currency in currencies {
+                if let price = rates[currency.identifier] {
+#if !SKIP
+                    results[currency] = Decimal(string: price)
+#else
+                    results[currency] = Decimal(price)
+#endif
+                }
+            }
+
+            return results
+        } catch {
+            return [:]
+        }
+    }
 }

Sources/SatsPrice/Network/FakePriceFetcher.swift

@@ -14,6 +14,19 @@ import Foundation
 /// Fake price fetcher that returns a randomized price. Useful for development testing without requiring a network call.
 class FakePriceFetcher: PriceFetcher {
     func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal? {
+        randomPrice()
+    }
+
+    func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency : Decimal] {
+        guard !currencies.isEmpty else {
+            return [:]
+        }
+
+        let prices = currencies.map { _ in randomPrice() }
+        return Dictionary(uniqueKeysWithValues: zip(currencies, prices))
+    }
+
+    private func randomPrice() -> Decimal {
         Decimal(Double.random(in: 10000...100000))
     }
 }

Sources/SatsPrice/Network/ManualPriceFetcher.swift

@@ -12,9 +12,19 @@ import Foundation
 
 /// Fake price fetcher that returns a randomized price. Useful for development testing without requiring a network call.
 class ManualPriceFetcher: PriceFetcher {
-    var price: Decimal = Decimal(1)
+    var prices: [Locale.Currency: Decimal] = [:]
 
     func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal? {
-        return price
+        prices[currency]
+    }
+
+    func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency : Decimal] {
+        guard !currencies.isEmpty else {
+            return [:]
+        }
+
+        let filteredCurrencies = currencies.filter { prices.keys.contains($0) }
+        let priceValues = filteredCurrencies.map { prices[$0, default: Decimal(0)] }
+        return Dictionary(uniqueKeysWithValues: zip(filteredCurrencies, priceValues))
     }
 }

Sources/SatsPrice/Network/PriceFetcher.swift

@@ -12,4 +12,5 @@ import Foundation
 
 protocol PriceFetcher {
     func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal?
+    func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency: Decimal]
 }

Sources/SatsPrice/Network/PriceFetcherDelegator.swift

@@ -42,4 +42,8 @@ class PriceFetcherDelegator: PriceFetcher {
     func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal? {
         return try await delegate.convertBTC(toCurrency: currency)
     }
+
+    func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency : Decimal] {
+        return try await delegate.convertBTC(toCurrencies: currencies)
+    }
 }

Sources/SatsPrice/Resources/Localizable.xcstrings

@@ -13,20 +13,23 @@
           }
         }
       }
+    },
+    "%@ BTC is the maximum." : {
+
     },
     "1 BTC to %@" : {
 
-    },
-    "21000000 BTC is the maximum." : {
-
-    },
-    "2100000000000000 sats is the maximum." : {
-
     },
     "BTC" : {
 
     },
-    "Currency" : {
+    "Change Currencies" : {
+
+    },
+    "Currencies" : {
+
+    },
+    "Current Currency" : {
 
     },
     "Last updated: %@" : {
@@ -37,6 +40,9 @@
     },
     "Sats" : {
 
+    },
+    "Selected Currencies" : {
+
     }
   },
   "version" : "1.0"

Sources/SatsPrice/SatsPriceApp.swift

@@ -11,6 +11,9 @@ let logger: Logger = Logger(subsystem: "xyz.tyiu.SatsPrice", category: "SatsPric
 /// The Android SDK number we are running against, or `nil` if not running on Android
 let androidSDK = ProcessInfo.processInfo.environment["android.os.Build.VERSION.SDK_INT"].flatMap({ Int($0) })
 
+/// The shared data model.
+private let model = try! SatsPriceModel(url: URL.documentsDirectory.appendingPathComponent("satsprice.sqlite"))
+
 /// The shared top-level view for the app, loaded from the platform-specific App delegates below.
 ///
 /// The default implementation merely loads the `ContentView` for the app and logs a message.
@@ -19,7 +22,7 @@ public struct RootView : View {
     }
 
     public var body: some View {
-        ContentView(.coinbase)
+        ContentView(model: model)
             .task {
                 logger.log("Welcome to Skip on \(androidSDK != nil ? "Android" : "Darwin")!")
                 logger.warning("Skip app logs are viewable in the Xcode console for iOS; Android logs can be viewed in Studio or using adb logcat")

Sources/SatsPrice/SatsViewModel.swift

@@ -13,17 +13,33 @@ import Foundation
 import SwiftUI
 
 class SatsViewModel: ObservableObject {
+    static let MAXIMUM_BTC = Decimal(21000000)
+
+    private static let SATS_IN_BTC = Decimal(100000000)
+
+    let model: SatsPriceModel
+
     @Published var lastUpdated: Date?
 
-    @Published var btcToCurrencyStringInternal: String = ""
+    @Published var priceSourceInternal: PriceSource = .coinbase
+    let priceFetcherDelegator = PriceFetcherDelegator(.coinbase)
+
     @Published var satsStringInternal: String = ""
     @Published var btcStringInternal: String = ""
-    @Published var currencyValueStringInternal: String = ""
+    @Published var selectedCurrencies = Set<Locale.Currency>()
-    @Published var selectedCurrency: Locale.Currency = Locale.current.currency ?? Locale.Currency("USD")
+    @Published var currencyValueStrings: [Locale.Currency: String] = [:]
+
+    @Published var currencyPrices: [Locale.Currency: Decimal] = [:]
+    @Published var currencyPriceStrings: [Locale.Currency: String] = [:]
+
+    let currentCurrency: Locale.Currency = Locale.current.currency ?? Locale.Currency("USD")
+
+    init(model: SatsPriceModel) {
+        self.model = model
+    }
 
     var currencies: [Locale.Currency] {
         let commonISOCurrencyCodes = Set(Locale.commonISOCurrencyCodes)
-        let currentCurrency = Locale.current.currency ?? Locale.Currency("USD")
         if commonISOCurrencyCodes.contains(currentCurrency.identifier) {
             return Locale.commonISOCurrencyCodes.map { Locale.Currency($0) }
         } else {
@@ -34,22 +50,72 @@ class SatsViewModel: ObservableObject {
         }
     }
 
-    var btcToCurrencyString: String {
+    @MainActor
+    func pullSelectedCurrenciesFromDB() async {
+        do {
+            let selectedCurrencies = Set(try await model.selectedCurrencies().compactMap { Locale.Currency($0.currencyCode) })
+            let currenciesToAdd = selectedCurrencies.subtracting(self.selectedCurrencies)
+            let currenciesToRemove = self.selectedCurrencies.subtracting(selectedCurrencies)
+
+            self.selectedCurrencies.subtract(currenciesToRemove)
+            self.selectedCurrencies.formUnion(currenciesToAdd)
+        } catch {
+            logger.error("Unable to pull selected currencies from DB. Error: \(error)")
+        }
+    }
+
+    func addSelectedCurrency(_ currency: Locale.Currency) {
+        selectedCurrencies.insert(currency)
+        Task {
+            try await model.insert(SelectedCurrency(currencyCode: currency.identifier))
+        }
+    }
+
+    func removeSelectedCurrency(_ currency: Locale.Currency) {
+        selectedCurrencies.remove(currency)
+        Task {
+            try await model.deleteSelectedCurrency(currencyCode: currency.identifier)
+        }
+    }
+
+    var priceSource: PriceSource {
         get {
-            btcToCurrencyStringInternal
+            priceSourceInternal
         }
         set {
-            guard btcToCurrencyStringInternal != newValue else {
+            priceSourceInternal = newValue
-                return
+            priceFetcherDelegator.priceSource = newValue
-            }
+        }
+    }
 
-            btcToCurrencyStringInternal = newValue
+    @MainActor
+    func updatePrice() async {
+        do {
+            let currencies = Set([currentCurrency] + selectedCurrencies)
+            let prices = try await priceFetcherDelegator.convertBTC(toCurrencies: Array(currencies))
 
-            if let btc, let btcToCurrency {
+            currencyPrices = prices
-                currencyValueStringInternal = (btc * btcToCurrency).formatString()
+            updateCurrencyPriceStrings()
-            } else {
+            updateCurrencyValueStrings()
-                currencyValueStringInternal = ""
+        } catch {
-            }
+            clearCurrencyValueStrings()
+        }
+        lastUpdated = Date.now
+    }
+
+    func updateCurrencyPriceStrings() {
+        currencyPriceStrings = Dictionary(
+            uniqueKeysWithValues: currencyPrices.map { ($0.key, $0.value.formatString(currency: $0.key)) }
+        )
+    }
+
+    private func priceWithoutGroupingSeparator(_ priceString: String) -> String {
+        let numberFormatter = NumberFormatter()
+        numberFormatter.numberStyle = .decimal
+        let decimalSeparator = numberFormatter.decimalSeparator
+
+        return priceString.filter {
+            $0.isDigit || String($0) == decimalSeparator
         }
     }
 
@@ -58,27 +124,33 @@ class SatsViewModel: ObservableObject {
             satsStringInternal
         }
         set {
-            guard satsStringInternal != newValue else {
+            let oldPriceWithoutGroupingSeparator = priceWithoutGroupingSeparator(satsStringInternal)
+            let newPriceWithoutGroupingSeparator = priceWithoutGroupingSeparator(newValue)
+
+            guard oldPriceWithoutGroupingSeparator != newPriceWithoutGroupingSeparator else {
                 return
             }
 
-            satsStringInternal = newValue
+            satsStringInternal = newPriceWithoutGroupingSeparator
 
             if let sats {
 #if !SKIP
-                let btc = sats / Decimal(100000000)
+                // Formatting the internal string after modifying it only if the platform is Apple.
+                // Apple does not seem to call get after set until after focus is moved to a different component.
+                // Android, on the other hand, does call get immediately after set,
+                // which causes text entry issues if the user keeps on entering input.
+                satsStringInternal = sats.formatSatsString()
+
+                let btc = sats / SatsViewModel.SATS_IN_BTC
 #else
-                let btc = sats.divide(Decimal(100000000), 20, java.math.RoundingMode.DOWN)
+                let btc = sats.divide(SatsViewModel.SATS_IN_BTC, 20, java.math.RoundingMode.DOWN)
 #endif
-                btcStringInternal = btc.formatString()
+                btcStringInternal = btc.formatBTCString()
-                if let btcToCurrency {
+
-                    currencyValueStringInternal = (btc * btcToCurrency).formatString()
+                updateCurrencyValueStrings()
-                } else {
-                    currencyValueStringInternal = ""
-                }
             } else {
                 btcStringInternal = ""
-                currencyValueStringInternal = ""
+                clearCurrencyValueStrings()
             }
         }
     }
@@ -88,81 +160,185 @@ class SatsViewModel: ObservableObject {
             btcStringInternal
         }
         set {
-            guard btcStringInternal != newValue else {
+            let oldPriceWithoutGroupingSeparator = priceWithoutGroupingSeparator(btcStringInternal)
+            let newPriceWithoutGroupingSeparator = priceWithoutGroupingSeparator(newValue)
+
+            guard oldPriceWithoutGroupingSeparator != newPriceWithoutGroupingSeparator else {
                 return
             }
 
-            btcStringInternal = newValue
+            btcStringInternal = newPriceWithoutGroupingSeparator
 
             if let btc {
-                let sats = btc * Decimal(100000000)
-                satsStringInternal = sats.formatString()
-
-                if let btcToCurrency {
-                    currencyValueStringInternal = (btc * btcToCurrency).formatString()
-                } else {
-                    currencyValueStringInternal = ""
-                }
-            } else {
-                satsStringInternal = ""
-                currencyValueStringInternal = ""
-            }
-        }
-    }
-
-    var currencyValueString: String {
-        get {
-            currencyValueStringInternal
-        }
-        set {
-            guard currencyValueStringInternal != newValue else {
-                return
-            }
-
-            currencyValueStringInternal = newValue
-
-            if let currencyValue {
-                if let btcToCurrency {
 #if !SKIP
-                    let btc = currencyValue / btcToCurrency
+                // Formatting the internal string after modifying it only if the platform is Apple.
-#else
+                // Apple does not seem to call get after set until after focus is moved to a different component.
-                    let btc = currencyValue.divide(btcToCurrency, 20, java.math.RoundingMode.DOWN)
+                // Android, on the other hand, does call get immediately after set,
+                // which causes text entry issues if the user keeps on entering input.
+                btcStringInternal = btc.formatBTCString()
 #endif
-                    btcStringInternal = btc.formatString()
 
-                    let sats = btc * Decimal(100000000)
+                let sats = btc * SatsViewModel.SATS_IN_BTC
-                    satsStringInternal = sats.formatString()
+                satsStringInternal = sats.formatSatsString()
-                } else {
+
-                    satsStringInternal = ""
+                updateCurrencyValueStrings()
-                    btcStringInternal = ""
-                    currencyValueStringInternal = ""
-                }
             } else {
                 satsStringInternal = ""
-                btcStringInternal = ""
+                clearCurrencyValueStrings()
-                currencyValueStringInternal = ""
             }
         }
     }
 
-    var btcToCurrency: Decimal? {
+    func updateCurrencyValueStrings(excludedCurrency: Locale.Currency? = nil) {
+        if let btc {
+            let currencies = Set([currentCurrency] + selectedCurrencies)
+                .filter { $0 != excludedCurrency }
+
+            for currency in currencies {
+                if let btcToCurrency = btcToCurrency(for: currency) {
+                    currencyValueStrings[currency] = (btc * btcToCurrency).formatString(currency: currency)
+                } else {
+                    currencyValueStrings[currency] = ""
+                }
+            }
+        } else {
+            clearCurrencyValueStrings()
+        }
+    }
+
+    func clearCurrencyValueStrings() {
+        for currency in currencyValueStrings.keys {
+            currencyValueStrings[currency] = ""
+        }
+    }
+
+    func currencyValueString(for currency: Locale.Currency) -> Binding<String> {
+        Binding<String>(
+            get: {
+                self.currencyValueStrings[currency, default: ""]
+            },
+            set: { newValue in
+                let oldPriceWithoutGroupingSeparator = self.priceWithoutGroupingSeparator(self.currencyValueStrings[currency] ?? "")
+                let newPriceWithoutGroupingSeparator = self.priceWithoutGroupingSeparator(newValue)
+
+                guard oldPriceWithoutGroupingSeparator != newPriceWithoutGroupingSeparator else {
+                    return
+                }
+
+                self.currencyValueStrings[currency] = newPriceWithoutGroupingSeparator
+
+                if let currencyValue = self.currencyValue(for: currency) {
+                    if let btcToCurrency = self.currencyPrices[currency] {
 #if !SKIP
-        return Decimal(string: btcToCurrencyStringInternal)
+                        let btc = currencyValue / btcToCurrency
+#else
+                        let btc = currencyValue.divide(btcToCurrency, 20, java.math.RoundingMode.DOWN)
+#endif
+                        self.btcStringInternal = btc.formatBTCString()
+
+                        let sats = btc * SatsViewModel.SATS_IN_BTC
+                        self.satsStringInternal = sats.formatSatsString()
+
+#if !SKIP
+                        // Formatting the internal string after modifying it only if the platform is Apple.
+                        // Apple does not seem to call get after set until after focus is moved to a different component.
+                        // Android, on the other hand, does call get immediately after set,
+                        // which causes text entry issues if the user keeps on entering input.
+                        self.updateCurrencyValueStrings(excludedCurrency: nil)
+#else
+                        self.updateCurrencyValueStrings(excludedCurrency: currency)
+#endif
+                    } else {
+                        self.satsStringInternal = ""
+                        self.btcStringInternal = ""
+                        self.clearCurrencyValueStrings()
+                    }
+                } else {
+                    self.satsStringInternal = ""
+                    self.btcStringInternal = ""
+                    self.clearCurrencyValueStrings()
+                }
+            }
+        )
+    }
+
+    func currencyValue(for currency: Locale.Currency) -> Decimal? {
+        guard let currencyValueString = currencyValueStrings[currency] else {
+            return nil
+        }
+
+#if !SKIP
+        return Decimal(string: priceWithoutGroupingSeparator(currencyValueString))
 #else
         do {
-            return Decimal(btcToCurrencyStringInternal)
+            return Decimal(currencyValueString)
         } catch {
             return nil
         }
 #endif
     }
 
-    var sats: Decimal? {
+    func btcToCurrency(for currency: Locale.Currency) -> Decimal? {
+        currencyPrices[currency]
+    }
+
+    func btcToCurrencyString(for currency: Locale.Currency) -> Binding<String> {
+        Binding<String>(
+            get: {
+                self.currencyPriceStrings[currency, default: ""]
+            },
+            set: { newValue in
+                let oldPriceWithoutGroupingSeparator = self.priceWithoutGroupingSeparator(self.currencyPriceStrings[currency, default: ""])
+                let newPriceWithoutGroupingSeparator = self.priceWithoutGroupingSeparator(newValue)
+
+                guard oldPriceWithoutGroupingSeparator != newPriceWithoutGroupingSeparator else {
+                    return
+                }
+
+                self.currencyPriceStrings[currency] = newPriceWithoutGroupingSeparator
+
 #if !SKIP
-        return Decimal(string: satsStringInternal)
+                if let newPrice = Decimal(string: newPriceWithoutGroupingSeparator), self.currencyPrices[currency] != newPrice {
+                    self.currencyPrices[currency] = newPrice
+
+                    // Formatting the internal string after modifying it only if the platform is Apple.
+                    // Apple does not seem to call get after set until after focus is moved to a different
+                    // component. Android, on the other hand, does call get immediately after set,
+                    // which causes text entry issues if the user keeps on entering input.
+                    self.currencyPriceStrings[currency] = newPrice.formatString(currency: currency)
+
+                    if let btc = self.btc {
+                        self.currencyValueStrings[currency] = (btc * newPrice).formatString(currency: currency)
+                    } else {
+                        self.currencyValueStrings[currency] = ""
+                    }
+                }
+#else
+                do {
+                    if let newPrice = Decimal(newPriceWithoutGroupingSeparator), self.currencyPrices[currency] != newPrice {
+                        self.currencyPrices[currency] = newPrice
+
+                        if let btc = self.btc {
+                            self.currencyValueStrings[currency] = (btc * newPrice).formatString()
+                        } else {
+                            self.currencyValueStrings[currency] = ""
+                        }
+                    }
+                } catch {
+                    self.currencyPrices.removeValue(forKey: currency)
+                }
+#endif
+            }
+        )
+    }
+
+    var sats: Decimal? {
+        let priceWithoutGroupingSeparator = priceWithoutGroupingSeparator(satsStringInternal)
+#if !SKIP
+        return Decimal(string: priceWithoutGroupingSeparator)
 #else
         do {
-            return Decimal(satsStringInternal)
+            return Decimal(priceWithoutGroupingSeparator)
         } catch {
             return nil
         }
@@ -170,23 +346,12 @@ class SatsViewModel: ObservableObject {
     }
 
     var btc: Decimal? {
+        let priceWithoutGroupingSeparator = priceWithoutGroupingSeparator(btcStringInternal)
 #if !SKIP
-        return Decimal(string: btcStringInternal)
+        return Decimal(string: priceWithoutGroupingSeparator)
 #else
         do {
-            return Decimal(btcStringInternal)
+            return Decimal(priceWithoutGroupingSeparator)
-        } catch {
-            return nil
-        }
-#endif
-    }
-
-    var currencyValue: Decimal? {
-#if !SKIP
-        return Decimal(string: currencyValueStringInternal)
-#else
-        do {
-            return Decimal(currencyValueStringInternal)
         } catch {
             return nil
         }
@@ -194,7 +359,7 @@ class SatsViewModel: ObservableObject {
     }
 
     var exceedsMaximum: Bool {
-        if let btc, btc > Decimal(21000000) {
+        if let btc, btc > SatsViewModel.MAXIMUM_BTC {
             return true
         }
         return false
@@ -207,6 +372,54 @@ extension Decimal {
         return String(describing: self)
 #else
         return stripTrailingZeros().toPlainString()
+#endif
+    }
+
+    func formatString(minimumFractionDigits: Int, maximumFractionDigits: Int, usesGroupingSeparator: Bool) -> String {
+        let numberFormatter = NumberFormatter()
+        numberFormatter.numberStyle = .decimal
+        numberFormatter.minimumFractionDigits = minimumFractionDigits
+        numberFormatter.maximumFractionDigits = maximumFractionDigits
+        numberFormatter.usesGroupingSeparator = usesGroupingSeparator
+#if !SKIP
+        return numberFormatter.string(from: NSDecimalNumber(decimal: self)) ?? String(describing: self)
+#else
+        return numberFormatter.string(from: android.icu.math.BigDecimal(self as java.math.BigDecimal) as NSNumber) ?? stripTrailingZeros().toPlainString()
+#endif
+    }
+
+    func formatSatsString() -> String {
+        formatString(minimumFractionDigits: 0, maximumFractionDigits: 0, usesGroupingSeparator: true)
+    }
+
+    func formatBTCString() -> String {
+        formatString(minimumFractionDigits: 0, maximumFractionDigits: 8, usesGroupingSeparator: true)
+    }
+
+    func formatString(currency: Locale.Currency) -> String {
+#if !SKIP
+        let currencyFormatter = NumberFormatter()
+        currencyFormatter.numberStyle = .currency
+        currencyFormatter.currencyCode = currency.identifier
+
+        return formatString(
+            minimumFractionDigits: currencyFormatter.minimumFractionDigits,
+            maximumFractionDigits: currencyFormatter.maximumFractionDigits,
+            usesGroupingSeparator: currencyFormatter.usesGroupingSeparator
+        )
+#else
+        let javaCurrency = java.util.Currency.getInstance(currency.identifier)
+        return formatString(
+            minimumFractionDigits: javaCurrency.getDefaultFractionDigits(),
+            maximumFractionDigits: javaCurrency.getDefaultFractionDigits(),
+            usesGroupingSeparator: true
+        )
 #endif
     }
 }
+
+private extension Character {
+    var isDigit: Bool {
+        self >= "0" && self <= "9"
+    }
+}

Tests/SatsPriceTests/SatsViewModelTests.swift

@@ -14,90 +14,92 @@ import XCTest
 
 final class SatsViewModelTests: XCTestCase {
 
-    func testSatsViewModel() {
+    let currency = Locale.Currency("USD")
-        let satsViewModel = SatsViewModel()
+
-        satsViewModel.btcToCurrencyString = "54321"
+    func testSatsViewModel() throws {
+        let satsPriceModel = try XCTUnwrap(SatsPriceModel(url: nil))
+        let satsViewModel = SatsViewModel(model: satsPriceModel)
+        satsViewModel.btcToCurrencyString(for: currency).wrappedValue = "54321"
 
         // Test BTC updates.
         satsViewModel.btcString = "1"
 #if !SKIP
         XCTAssertEqual(satsViewModel.btc, Decimal(string: "1"))
         XCTAssertEqual(satsViewModel.sats, Decimal(string: "100000000"))
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal(string: "54321"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal(string: "54321"))
 #else
         XCTAssertEqual(satsViewModel.btc, Decimal("1"))
         XCTAssertEqual(satsViewModel.sats, Decimal("100000000"))
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal("54321"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal("54321"))
 #endif
         XCTAssertEqual(satsViewModel.btcString, "1")
-        XCTAssertEqual(satsViewModel.satsString, "100000000")
+        XCTAssertEqual(satsViewModel.satsString, "100,000,000")
-        XCTAssertEqual(satsViewModel.currencyValueString, "54321")
+        XCTAssertEqual(satsViewModel.currencyValueString(for: currency).wrappedValue, "54,321.00")
 
         // Test Sats updates.
         satsViewModel.satsString = "200000000"
 #if !SKIP
         XCTAssertEqual(satsViewModel.btc, Decimal(string: "2"))
         XCTAssertEqual(satsViewModel.sats, Decimal(string: "200000000"))
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal(string: "108642"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal(string: "108642"))
 #else
         XCTAssertEqual(satsViewModel.btc, Decimal("2"))
         XCTAssertEqual(satsViewModel.sats, Decimal("200000000"))
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal("108642"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal("108642"))
 #endif
         XCTAssertEqual(satsViewModel.btcString, "2")
-        XCTAssertEqual(satsViewModel.satsString, "200000000")
+        XCTAssertEqual(satsViewModel.satsString, "200,000,000")
-        XCTAssertEqual(satsViewModel.currencyValueString, "108642")
+        XCTAssertEqual(satsViewModel.currencyValueString(for: currency).wrappedValue, "108,642.00")
 
         // Test currency value updates.
-        satsViewModel.currencyValueString = "162963"
+        satsViewModel.currencyValueString(for: currency).wrappedValue = "162963"
 #if !SKIP
         XCTAssertEqual(satsViewModel.btc, Decimal(string: "3"))
         XCTAssertEqual(satsViewModel.sats, Decimal(string: "300000000"))
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal(string: "162963"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal(string: "162963"))
 #else
         XCTAssertEqual(satsViewModel.btc, Decimal("3"))
         XCTAssertEqual(satsViewModel.sats, Decimal("300000000"))
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal("162963"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal("162963"))
 #endif
         XCTAssertEqual(satsViewModel.btcString, "3")
-        XCTAssertEqual(satsViewModel.satsString, "300000000")
+        XCTAssertEqual(satsViewModel.satsString, "300,000,000")
-        XCTAssertEqual(satsViewModel.currencyValueString, "162963")
+        XCTAssertEqual(satsViewModel.currencyValueString(for: currency).wrappedValue, "162,963.00")
 
         // Test fractional amounts.
         // Precision between platforms on this calculation is different so we have different assertions for each.
-        satsViewModel.currencyValueString = "1"
+        satsViewModel.currencyValueString(for: currency).wrappedValue = "1"
 #if !SKIP
-        XCTAssertEqual(satsViewModel.btc, Decimal(string: "0.00001840908672520756245282671526665562"))
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "0.00001841"))
-        XCTAssertEqual(satsViewModel.btcString, "0.00001840908672520756245282671526665562")
+        XCTAssertEqual(satsViewModel.btcString, "0.00001841")
-        XCTAssertEqual(satsViewModel.sats, Decimal(string: "1840.908672520756245282671526665562"))
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "1841"))
-        XCTAssertEqual(satsViewModel.satsString, "1840.908672520756245282671526665562")
+        XCTAssertEqual(satsViewModel.satsString, "1,841")
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal(string: "1"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal(string: "1"))
 #else
-        XCTAssertEqual(satsViewModel.btc, Decimal("0.00001840908672520756"))
+        XCTAssertEqual(satsViewModel.btc, Decimal("0.00001841"))
-        XCTAssertEqual(satsViewModel.btcString, "0.00001840908672520756")
+        XCTAssertEqual(satsViewModel.btcString, "0.00001841")
-        XCTAssertEqual(satsViewModel.sats, Decimal("1840.908672520756"))
+        XCTAssertEqual(satsViewModel.sats, Decimal("1841"))
-        XCTAssertEqual(satsViewModel.satsString, "1840.908672520756")
+        XCTAssertEqual(satsViewModel.satsString, "1,841")
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal("1"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal("1"))
 #endif
-        XCTAssertEqual(satsViewModel.currencyValueString, "1")
+        XCTAssertEqual(satsViewModel.currencyValueString(for: currency).wrappedValue, "1.00")
 
         // Test large amounts that exceed the cap of 21M BTC.
-        // Precision between platforms on this calculation is different so we have different assertions for each.
+        satsViewModel.currencyValueString(for: currency).wrappedValue = "11407419999999"
-        satsViewModel.currencyValueString = "11407419999999"
 #if !SKIP
-        XCTAssertEqual(satsViewModel.btc, Decimal(string: "210000184.09084884298889932070469983984"))
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "210000184.09084884"))
-        XCTAssertEqual(satsViewModel.btcString, "210000184.09084884298889932070469983984")
+        XCTAssertEqual(satsViewModel.btcString, "210,000,184.09084884")
-        XCTAssertEqual(satsViewModel.sats, Decimal(string: "21000018409084884.298889932070469983984"))
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "21000018409084884"))
-        XCTAssertEqual(satsViewModel.satsString, "21000018409084884.298889932070469983984")
+        XCTAssertEqual(satsViewModel.satsString, "21,000,018,409,084,884")
-        XCTAssertEqual(satsViewModel.currencyValue, Decimal(string: "11407419999999"))
+        XCTAssertEqual(satsViewModel.currencyValue(for: currency), Decimal(string: "11407419999999"))
 #else
-        XCTAssertEqual(satsViewModel.btc, Decimal("210000184.0908488429888993207"))
+        XCTAssertEqual(satsViewModel.btc, Decimal("210000184.09084884"))
-        XCTAssertEqual(satsViewModel.btcString, "210000184.0908488429888993207")
+        XCTAssertEqual(satsViewModel.btcString, "210000184.09084884")
-        XCTAssertEqual(satsViewModel.sats, Decimal("21000018409084884.29888993207"))
+        XCTAssertEqual(satsViewModel.sats, Decimal("21000018409084884"))
-        XCTAssertEqual(satsViewModel.satsString, "21000018409084884.29888993207")
+        XCTAssertEqual(satsViewModel.satsString, "21000018409084884")
         XCTAssertEqual(satsViewModel.currencyValue, Decimal("11407419999999"))
 #endif
-        XCTAssertEqual(satsViewModel.currencyValueString, "11407419999999")
+        XCTAssertEqual(satsViewModel.currencyValueString(for: currency).wrappedValue, "11,407,419,999,999.00")
     }
 
 }

docs/assets/download_on_apple.svg

@@ -0,0 +1,46 @@
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+  <title>Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917</title>
+  <g>
+    <g>
+      <g>
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+        <path d="M8.44483,39.125c-.30468,0-.602-.0039-.90429-.0107a12.68714,12.68714,0,0,1-1.86914-.1631,5.88381,5.88381,0,0,1-1.65674-.5479,5.40573,5.40573,0,0,1-1.397-1.0166,5.32082,5.32082,0,0,1-1.02051-1.3965,5.72186,5.72186,0,0,1-.543-1.6572,12.41351,12.41351,0,0,1-.1665-1.875c-.00634-.2109-.01464-.9131-.01464-.9131V8.44434S.88185,7.75293.8877,7.5498a12.37039,12.37039,0,0,1,.16553-1.87207,5.7555,5.7555,0,0,1,.54346-1.6621A5.37349,5.37349,0,0,1,2.61183,2.61768,5.56543,5.56543,0,0,1,4.01417,1.59521a5.82309,5.82309,0,0,1,1.65332-.54394A12.58589,12.58589,0,0,1,7.543.88721L8.44532.875H111.21387l.9131.0127a12.38493,12.38493,0,0,1,1.8584.16259,5.93833,5.93833,0,0,1,1.6709.54785,5.59374,5.59374,0,0,1,2.415,2.41993,5.76267,5.76267,0,0,1,.5352,1.64892,12.995,12.995,0,0,1,.1738,1.88721c.0029.2832.0029.5874.0029.89014.0079.375.0079.73193.0079,1.09179V30.4648c0,.3633,0,.7178-.0079,1.0752,0,.3252,0,.6231-.0039.9297a12.73126,12.73126,0,0,1-.1709,1.8535,5.739,5.739,0,0,1-.54,1.67,5.48029,5.48029,0,0,1-1.0156,1.3857,5.4129,5.4129,0,0,1-1.3994,1.0225,5.86168,5.86168,0,0,1-1.668.5498,12.54218,12.54218,0,0,1-1.8692.1631c-.2929.0068-.5996.0107-.8974.0107l-1.084.002Z"/>
+      </g>
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+        <g id="_Group_2" data-name="&lt;Group&gt;">
+          <g id="_Group_3" data-name="&lt;Group&gt;">
+            <path id="_Path_" data-name="&lt;Path&gt;" d="M24.76888,20.30068a4.94881,4.94881,0,0,1,2.35656-4.15206,5.06566,5.06566,0,0,0-3.99116-2.15768c-1.67924-.17626-3.30719,1.00483-4.1629,1.00483-.87227,0-2.18977-.98733-3.6085-.95814a5.31529,5.31529,0,0,0-4.47292,2.72787c-1.934,3.34842-.49141,8.26947,1.3612,10.97608.9269,1.32535,2.01018,2.8058,3.42763,2.7533,1.38706-.05753,1.9051-.88448,3.5794-.88448,1.65876,0,2.14479.88448,3.591.8511,1.48838-.02416,2.42613-1.33124,3.32051-2.66914a10.962,10.962,0,0,0,1.51842-3.09251A4.78205,4.78205,0,0,1,24.76888,20.30068Z" style="fill: #fff"/>
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+          </g>
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+        <path d="M59.09377,8.437h.88867v6.26074h-.88867Z" style="fill: #fff"/>
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+        <path d="M79.23,12.44434a2.13323,2.13323,0,1,1,4.24707,0,2.13358,2.13358,0,1,1-4.24707,0Zm3.333,0c0-.97607-.43848-1.54687-1.208-1.54687-.77246,0-1.207.5708-1.207,1.54688,0,.98389.43457,1.55029,1.207,1.55029C82.12453,13.99463,82.563,13.42432,82.563,12.44434Z" style="fill: #fff"/>
+        <path d="M84.66945,10.19482h.85547v.71533h.06641a1.348,1.348,0,0,1,1.34375-.80225,1.46456,1.46456,0,0,1,1.55859,1.6748v2.915H87.605V12.00586c0-.72363-.31445-1.0835-.97168-1.0835a1.03294,1.03294,0,0,0-1.0752,1.14111v2.63428h-.88867Z" style="fill: #fff"/>
+        <path d="M93.51516,9.07373v1.1416h.97559v.74854h-.97559V13.2793c0,.47168.19434.67822.63672.67822a2.96657,2.96657,0,0,0,.33887-.02051v.74023a2.9155,2.9155,0,0,1-.4834.04541c-.98828,0-1.38184-.34766-1.38184-1.21582v-2.543h-.71484v-.74854h.71484V9.07373Z" style="fill: #fff"/>
+        <path d="M95.70461,8.437h.88086v2.48145h.07031a1.3856,1.3856,0,0,1,1.373-.80664,1.48339,1.48339,0,0,1,1.55078,1.67871v2.90723H98.69v-2.688c0-.71924-.335-1.0835-.96289-1.0835a1.05194,1.05194,0,0,0-1.13379,1.1416v2.62988h-.88867Z" style="fill: #fff"/>
+        <path d="M104.76125,13.48193a1.828,1.828,0,0,1-1.95117,1.30273A2.04531,2.04531,0,0,1,100.73,12.46045a2.07685,2.07685,0,0,1,2.07617-2.35254c1.25293,0,2.00879.856,2.00879,2.27V12.688h-3.17969v.0498a1.1902,1.1902,0,0,0,1.19922,1.29,1.07934,1.07934,0,0,0,1.07129-.5459Zm-3.126-1.45117h2.27441a1.08647,1.08647,0,0,0-1.1084-1.1665A1.15162,1.15162,0,0,0,101.63527,12.03076Z" style="fill: #fff"/>
+      </g>
+    </g>
+  </g>
+</svg>

docs/assets/download_on_github.svg

@@ -0,0 +1 @@
+<svg width="98" height="96" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M48.854 0C21.839 0 0 22 0 49.217c0 21.756 13.993 40.172 33.405 46.69 2.427.49 3.316-1.059 3.316-2.362 0-1.141-.08-5.052-.08-9.127-13.59 2.934-16.42-5.867-16.42-5.867-2.184-5.704-5.42-7.17-5.42-7.17-4.448-3.015.324-3.015.324-3.015 4.934.326 7.523 5.052 7.523 5.052 4.367 7.496 11.404 5.378 14.235 4.074.404-3.178 1.699-5.378 3.074-6.6-10.839-1.141-22.243-5.378-22.243-24.283 0-5.378 1.94-9.778 5.014-13.2-.485-1.222-2.184-6.275.486-13.038 0 0 4.125-1.304 13.426 5.052a46.97 46.97 0 0 1 12.214-1.63c4.125 0 8.33.571 12.213 1.63 9.302-6.356 13.427-5.052 13.427-5.052 2.67 6.763.97 11.816.485 13.038 3.155 3.422 5.015 7.822 5.015 13.2 0 18.905-11.404 23.06-22.324 24.283 1.78 1.548 3.316 4.481 3.316 9.126 0 6.6-.08 11.897-.08 13.526 0 1.304.89 2.853 3.316 2.364 19.412-6.52 33.405-24.935 33.405-46.691C97.707 22 75.788 0 48.854 0z" fill="#24292f"/></svg>

zapstore.yaml

@@ -0,0 +1,7 @@
+satsprice:
+  android:
+    name: SatsPrice
+    description: SatsPrice fetches the price of Bitcoin relative to common ISO currencies from multiple sources, and converts inputted amounts between Sats, BTC, and the selected ISO currency.
+    repository: https://github.com/tyiu/sats-price
+    artifacts:
+      - SatsPrice-v%v.apk