Add support for manual price entry

SatsPrice.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		3A7B2AA32B86407A00ACC4A7 /* FakePriceFetcher.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3A7B2AA22B86407A00ACC4A7 /* FakePriceFetcher.swift */; };
+		3A8E5DA72C810C9900E9E6BD /* ManualPriceFetcher.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3A8E5DA62C810C9900E9E6BD /* ManualPriceFetcher.swift */; };
 		3AE2D39D2B83338D00DE5F31 /* SatsPriceApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3AE2D39C2B83338D00DE5F31 /* SatsPriceApp.swift */; };
 		3AE2D3A22B83338D00DE5F31 /* SatsPrice.xcdatamodeld in Sources */ = {isa = PBXBuildFile; fileRef = 3AE2D3A02B83338D00DE5F31 /* SatsPrice.xcdatamodeld */; };
 		3AE2D3A42B83338D00DE5F31 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3AE2D3A32B83338D00DE5F31 /* ContentView.swift */; };
@@ -45,6 +46,7 @@
 
 /* Begin PBXFileReference section */
 		3A7B2AA22B86407A00ACC4A7 /* FakePriceFetcher.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FakePriceFetcher.swift; sourceTree = "<group>"; };
+		3A8E5DA62C810C9900E9E6BD /* ManualPriceFetcher.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ManualPriceFetcher.swift; sourceTree = "<group>"; };
 		3AE2D3992B83338D00DE5F31 /* SatsPrice.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = SatsPrice.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		3AE2D39C2B83338D00DE5F31 /* SatsPriceApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SatsPriceApp.swift; sourceTree = "<group>"; };
 		3AE2D3A12B83338D00DE5F31 /* SatsPrice.xcdatamodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcdatamodel; path = SatsPrice.xcdatamodel; sourceTree = "<group>"; };
@@ -159,6 +161,7 @@
 				3AE2D3E02B8459D600DE5F31 /* CoinbasePriceFetcher.swift */,
 				3AE2D3E22B8461FE00DE5F31 /* CoinGeckoPriceFetcher.swift */,
 				3A7B2AA22B86407A00ACC4A7 /* FakePriceFetcher.swift */,
+				3A8E5DA62C810C9900E9E6BD /* ManualPriceFetcher.swift */,
 				3AE2D3DE2B84597100DE5F31 /* PriceFetcher.swift */,
 				3AE2D3E62B85690200DE5F31 /* PriceFetcherDelegator.swift */,
 				3AE2D3E42B846A8600DE5F31 /* PriceSource.swift */,
@@ -309,6 +312,7 @@
 				3AE2D39D2B83338D00DE5F31 /* SatsPriceApp.swift in Sources */,
 				3AE2D3A22B83338D00DE5F31 /* SatsPrice.xcdatamodeld in Sources */,
 				3AE2D3A42B83338D00DE5F31 /* ContentView.swift in Sources */,
+				3A8E5DA72C810C9900E9E6BD /* ManualPriceFetcher.swift in Sources */,
 				3AE2D3D52B83E58500DE5F31 /* SatsViewModel.swift in Sources */,
 				3AE2D3E32B8461FE00DE5F31 /* CoinGeckoPriceFetcher.swift in Sources */,
 				3AE2D3DF2B84597100DE5F31 /* PriceFetcher.swift in Sources */,

SatsPrice/ContentView.swift

@@ -50,16 +50,14 @@ struct ContentView: View {
                         Text($0.description)
                     }
                 }
-                .onChange(of: priceSource) { newPriceSource in
-                    priceFetcherDelegator.priceSource = newPriceSource
-                    Task {
-                        await updatePrice()
-                    }
-                }
 
                 HStack {
                     TextField("", text: $satsViewModel.btcToUsdString)
-                        .disabled(true)
+                        .disabled(priceSource != .manual)
+#if os(iOS)
+                        .keyboardType(.decimalPad)
+#endif
+                    if priceSource != .manual {
                         Button(action: {
                             Task {
                                 await updatePrice()
@@ -68,6 +66,7 @@ struct ContentView: View {
                             Image(systemName: "arrow.clockwise")
                         }
                     }
+                }
             } header: {
                 Text("1 BTC to USD")
             } footer: {
@@ -104,6 +103,12 @@ struct ContentView: View {
         .task {
             await updatePrice()
         }
+        .onChange(of: priceSource) { newPriceSource in
+            priceFetcherDelegator.priceSource = newPriceSource
+            Task {
+                await updatePrice()
+            }
+        }
 #if os(macOS)
         .formStyle(.grouped)
 #endif

SatsPrice/Network/ManualPriceFetcher.swift

@@ -0,0 +1,18 @@
+//
+//  ManualPriceFetcher.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 8/29/24.
+//
+
+import Foundation
+import BigDecimal
+
+/// Fake price fetcher that returns a randomized price. Useful for development testing without requiring a network call.
+class ManualPriceFetcher: PriceFetcher {
+    var price: BigDecimal = 1
+
+    func btcToUsd() async throws -> BigDecimal? {
+        return price
+    }
+}

SatsPrice/Network/PriceFetcherDelegator.swift

@@ -11,6 +11,7 @@ import BigDecimal
 class PriceFetcherDelegator: PriceFetcher {
     private let coinbasePriceFetcher = CoinbasePriceFetcher()
     private let coinGeckoPriceFetcher = CoinGeckoPriceFetcher()
+    private let manualPriceFetcher = ManualPriceFetcher()
 #if DEBUG
     private let fakePriceFetcher = FakePriceFetcher()
 #endif
@@ -27,6 +28,8 @@ class PriceFetcherDelegator: PriceFetcher {
             coinbasePriceFetcher
         case .coingecko:
             coinGeckoPriceFetcher
+        case .manual:
+            manualPriceFetcher
 #if DEBUG
         case .fake:
             fakePriceFetcher

SatsPrice/Network/PriceSource.swift

@@ -11,14 +11,15 @@ enum PriceSource: CaseIterable, CustomStringConvertible {
     
     static var allCases: [PriceSource] {
 #if DEBUG
-        [.coinbase, .coingecko, .fake]
+        [.coinbase, .coingecko, .manual, .fake]
 #else
-        [.coinbase, .coingecko]
+        [.coinbase, .coingecko, .manual]
 #endif
     }
 
     case coinbase
     case coingecko
+    case manual
 
 #if DEBUG
     case fake
@@ -30,6 +31,8 @@ enum PriceSource: CaseIterable, CustomStringConvertible {
             "Coinbase"
         case .coingecko:
             "CoinGecko"
+        case .manual:
+            "Manual"
 #if DEBUG
         case .fake:
             "Fake"