Initial commit

SatsPrice/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SatsPrice/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "bitcoin-calculator-1024 1.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "filename" : "bitcoin-calculator-16.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "bitcoin-calculator-32 1.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "bitcoin-calculator-32.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "bitcoin-calculator-64.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "bitcoin-calculator-128.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "bitcoin-calculator-256 1.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "bitcoin-calculator-256.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "bitcoin-calculator-512 1.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "bitcoin-calculator-512.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "filename" : "bitcoin-calculator-1024.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SatsPrice/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SatsPrice/ContentView.swift

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+//
+//  ContentView.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import SwiftUI
+import BigDecimal
+
+struct ContentView: View {
+    @ObservedObject private var satsViewModel = SatsViewModel()
+
+    @State private var spotPriceSource: SpotPriceSource = .coinbase
+
+    private let dateFormatter = DateFormatter()
+
+    private let spotPriceFetcherDelegator = SpotPriceFetcherDelegator()
+
+    init() {
+        dateFormatter.dateStyle = .short
+        dateFormatter.timeStyle = .short
+    }
+
+    @MainActor
+    func updatePrice() async {
+        do {
+            guard let price = try await spotPriceFetcherDelegator.btcToUsd() else {
+                satsViewModel.btcToUsdString = ""
+                return
+            }
+
+            satsViewModel.btcToUsdString = "\(price)"
+        } catch {
+            satsViewModel.btcToUsdString = ""
+        }
+        satsViewModel.lastUpdated = Date.now
+    }
+
+    var body: some View {
+        Form {
+            Section {
+                Picker("Price Source", selection: $spotPriceSource) {
+                    ForEach(SpotPriceSource.allCases, id: \.self) {
+                        Text($0.description)
+                    }
+                }
+                .onChange(of: spotPriceSource) { newSpotPriceSource in
+                    spotPriceFetcherDelegator.spotPriceSource = newSpotPriceSource
+                    Task {
+                        await updatePrice()
+                    }
+                }
+
+                HStack {
+                    TextField("", text: $satsViewModel.btcToUsdString)
+                        .disabled(true)
+                    Button(action: {
+                        Task {
+                            await updatePrice()
+                        }
+                    }) {
+                        Image(systemName: "arrow.clockwise")
+                    }
+                }
+            } header: {
+                Text("1 BTC to USD")
+            } footer: {
+                Text("Last updated: \(dateFormatter.string(from: satsViewModel.lastUpdated))")
+            }
+
+#if os(iOS)
+            Section {
+                TextField("", text: $satsViewModel.satsString)
+                    .keyboardType(.numberPad)
+            } header: {
+                Text("Sats")
+            }
+
+            Section {
+                TextField("", text: $satsViewModel.btcString)
+                    .keyboardType(.decimalPad)
+            } header: {
+                Text("BTC")
+            }
+
+            Section {
+                TextField("", text: $satsViewModel.usdString)
+                    .keyboardType(.decimalPad)
+            } header: {
+                Text("USD")
+            }
+#else
+            Section {
+                TextField("", text: $satsViewModel.satsString)
+            } header: {
+                Text("Sats")
+            }
+
+            Section {
+                TextField("", text: $satsViewModel.btcString)
+            } header: {
+                Text("BTC")
+            }
+
+            Section {
+                TextField("", text: $satsViewModel.usdString)
+            } header: {
+                Text("USD")
+            }
+#endif
+        }
+        .task {
+            await updatePrice()
+        }
+        .formStyle(.grouped)
+    }
+}
+
+#Preview {
+    ContentView()
+}

SatsPrice/Network/CoinGeckoSpotPriceFetcher.swift

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+//
+//  CoinGeckoSpotPriceFetcher.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import Foundation
+import BigDecimal
+
+private struct CoinGeckoSpotPriceResponse: Codable {
+    let bitcoin: CoinGeckoSpotPrice
+}
+
+private struct CoinGeckoSpotPrice: Codable {
+    let usd: Decimal
+}
+
+class CoinGeckoSpotPriceFetcher : SpotPriceFetcher {
+    private static let urlString = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd&precision=18"
+
+    func btcToUsd() async throws -> BigDecimal? {
+        do {
+            guard let urlComponents = URLComponents(string: CoinGeckoSpotPriceFetcher.urlString), let url = urlComponents.url else {
+                return nil
+            }
+
+            let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
+
+            let spotPriceResponse = try JSONDecoder().decode(CoinGeckoSpotPriceResponse.self, from: data)
+            let spotPrice = spotPriceResponse.bitcoin
+
+            return BigDecimal(spotPrice.usd)
+        } catch {
+            return nil
+        }
+    }
+}

SatsPrice/Network/CoinbaseSpotPriceFetcher.swift

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+//
+//  CoinbaseSpotPriceFetcher.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import Foundation
+import BigDecimal
+
+private struct CoinbaseSpotPriceResponse: Codable {
+    let data: CoinbaseSpotPrice
+}
+
+private struct CoinbaseSpotPrice: Codable {
+    let amount: String
+    let base: String
+    let currency: String
+}
+
+class CoinbaseSpotPriceFetcher : SpotPriceFetcher {
+    private static let urlString = "https://api.coinbase.com/v2/prices/BTC-USD/spot"
+    private static let btc = "BTC"
+    private static let usd = "USD"
+
+    func btcToUsd() async throws -> BigDecimal? {
+        do {
+            guard let urlComponents = URLComponents(string: CoinbaseSpotPriceFetcher.urlString), let url = urlComponents.url else {
+                return nil
+            }
+
+            let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
+
+            let coinbaseSpotPriceResponse = try JSONDecoder().decode(CoinbaseSpotPriceResponse.self, from: data)
+            let coinbaseSpotPrice = coinbaseSpotPriceResponse.data
+
+            guard coinbaseSpotPrice.base == CoinbaseSpotPriceFetcher.btc && coinbaseSpotPrice.currency == CoinbaseSpotPriceFetcher.usd else {
+                return nil
+            }
+
+            return BigDecimal(coinbaseSpotPrice.amount)
+        } catch {
+            return nil
+        }
+    }
+}

SatsPrice/Network/SpotPriceFetcher.swift

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+//
+//  SpotPriceFetcher.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import Foundation
+import BigDecimal
+
+protocol SpotPriceFetcher {
+    func btcToUsd() async throws -> BigDecimal?
+}

SatsPrice/Network/SpotPriceFetcherDelegator.swift

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+//
+//  SpotPriceFetcherDelegator.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/20/24.
+//
+
+import Foundation
+import BigDecimal
+
+class SpotPriceFetcherDelegator: SpotPriceFetcher {
+    private let coinbaseSpotPriceFetcher = CoinbaseSpotPriceFetcher()
+    private let coinGeckoSpotPriceFetcher = CoinGeckoSpotPriceFetcher()
+
+    var spotPriceSource: SpotPriceSource = .coinbase
+
+    private var delegate: SpotPriceFetcher {
+        switch spotPriceSource {
+        case .coinbase:
+            coinbaseSpotPriceFetcher
+        case .coingecko:
+            coinGeckoSpotPriceFetcher
+        }
+    }
+
+    func btcToUsd() async throws -> BigDecimal? {
+        return try await delegate.btcToUsd()
+    }
+}

SatsPrice/Preview Content/Preview Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SatsPrice/SatsPrice.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!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>

SatsPrice/SatsPrice.xcdatamodeld/.xccurrentversion

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>_XCCurrentVersionName</key>
+	<string>SatsPrice.xcdatamodel</string>
+</dict>
+</plist>

SatsPrice/SatsPrice.xcdatamodeld/SatsPrice.xcdatamodel/contents

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="1" systemVersion="11A491" minimumToolsVersion="Automatic" sourceLanguage="Swift" usedWithCloudKit="false" userDefinedModelVersionIdentifier="">
+    <entity name="Item" representedClassName="Item" syncable="YES" codeGenerationType="class">
+        <attribute name="timestamp" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+    </entity>
+    <elements>
+        <element name="Item" positionX="-63" positionY="-18" width="128" height="44"/>
+    </elements>
+</model>

SatsPrice/SatsPriceApp.swift

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+//
+//  SatsPriceApp.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import SwiftUI
+
+@main
+struct SatsPriceApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}

SatsPrice/SatsViewModel.swift

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+//
+//  SatsViewModel.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import Foundation
+import BigDecimal
+
+class SatsViewModel: ObservableObject {
+    @Published private(set) var btcToUsd: BigDecimal = BigDecimal.nan
+    @Published var lastUpdated: Date = Date.now
+
+    @Published private(set) var sats: BigDecimal = 0
+    @Published private(set) var btc: BigDecimal = 0
+    @Published private(set) var usd: BigDecimal = 0
+
+    var btcToUsdString: String {
+        get { btcToUsd.asString(.plain) }
+        set {
+            self.btcToUsd = BigDecimal(newValue)
+            self.usd = btc.multiply(btcToUsd, Rounding(.down, 20))
+        }
+    }
+
+    var satsString: String {
+        get { sats.asString(.plain) }
+        set {
+            self.sats = BigDecimal(newValue)
+
+            let preciseDivide = sats.divide(100000000)
+            if preciseDivide.isNaN {
+                self.btc = sats.divide(100000000, Rounding(.down, 20))
+            } else {
+                self.btc = sats.divide(100000000)
+            }
+
+            self.usd = btc.multiply(btcToUsd, Rounding(.down, 20))
+        }
+    }
+
+    var btcString: String {
+        get { btc.asString(.plain) }
+        set {
+            self.btc = BigDecimal(newValue)
+            self.sats = btc.multiply(100000000, Rounding(.down, 20))
+            self.usd = btc.multiply(btcToUsd, Rounding(.down, 20))
+        }
+    }
+
+    var usdString: String {
+        get { usd.asString(.plain) }
+        set {
+            self.usd = BigDecimal(newValue)
+
+            let preciseDivide = usd.divide(btcToUsd)
+            if preciseDivide.isNaN {
+                self.btc = usd.divide(btcToUsd, Rounding(.down, 20))
+            } else {
+                self.btc = usd.divide(btcToUsd)
+            }
+
+            self.sats = btc.multiply(100000000, Rounding(.down, 20))
+        }
+    }
+}

SatsPrice/SpotPriceSource.swift

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+//
+//  SpotPriceSource.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/20/24.
+//
+
+import Foundation
+
+enum SpotPriceSource: CaseIterable, CustomStringConvertible {
+    case coinbase
+    case coingecko
+
+    var description: String {
+        switch self {
+        case .coinbase:
+            "Coinbase"
+        case .coingecko:
+            "CoinGecko"
+        }
+    }
+}