Convert SatsPrice to a Skip multiplatform app

Sources/SatsPrice/Network/PriceFetcherDelegator.swift

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+// 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
+//
+//  PriceFetcherDelegator.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/20/24.
+//
+
+import Foundation
+
+class PriceFetcherDelegator: PriceFetcher {
+    private let coinbasePriceFetcher = CoinbasePriceFetcher()
+    private let coinGeckoPriceFetcher = CoinGeckoPriceFetcher()
+    private let manualPriceFetcher = ManualPriceFetcher()
+#if DEBUG
+    private let fakePriceFetcher = FakePriceFetcher()
+#endif
+
+    var priceSource: PriceSource
+
+    init(_ priceSource: PriceSource) {
+        self.priceSource = priceSource
+    }
+
+    private var delegate: PriceFetcher {
+        switch priceSource {
+        case .coinbase:
+            coinbasePriceFetcher
+        case .coingecko:
+            coinGeckoPriceFetcher
+        case .manual:
+            manualPriceFetcher
+#if DEBUG
+        case .fake:
+            fakePriceFetcher
+#endif
+        }
+    }
+
+    func btcToUsd() async throws -> Decimal? {
+        return try await delegate.btcToUsd()
+    }
+}