From 9e37fc038b2e93e3995e431e6ef89099ba050bd2 Mon Sep 17 00:00:00 2001
From: Daiki Matsudate <d.matsudate@gmail.com>
Date: Sat, 23 Mar 2024 01:54:03 +0900
Subject: [PATCH] Add safari dependency values

Using `SFSafariViewController` in the context of SwiftUI does not work well around navigation. Therefore, using it in the context of UIKIt works better.
cf: https://sarunw.com/posts/sfsafariviewcontroller-in-swiftui/
---
 .../DependencyValues/Safari.swift             | 88 +++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 Sources/Dependencies/DependencyValues/Safari.swift

diff --git a/Sources/Dependencies/DependencyValues/Safari.swift b/Sources/Dependencies/DependencyValues/Safari.swift
new file mode 100644
index 00000000..85b0920e
--- /dev/null
+++ b/Sources/Dependencies/DependencyValues/Safari.swift
@@ -0,0 +1,88 @@
+#if canImport(SafariServices) && canImport(SwiftUI)
+import SafariServices
+import SwiftUI
+
+extension DependencyValues {
+  /// A dependency that opens a URL in SFSafariViewController.
+  ///
+  /// In iOS, `SFSafariViewController` in UIKit context is used since navigation in SwiftUI context is not completly work well. Otherwise use openURL in environment values
+  ///
+  /// - SeeAlso: [How to use SFSafariViewController in SwiftUI ](https://sarunw.com/posts/sfsafariviewcontroller-in-swiftui/) by Sarunw.
+  @available(iOS 14, macOS 11, tvOS 14, watchOS 7, *)
+  public var safari: SafariEffect {
+    get { self[SafariKey.self] }
+    set { self[SafariKey.self] = newValue }
+  }
+}
+
+@available(iOS 14, macOS 11, tvOS 14, watchOS 7, *)
+private enum SafariKey: DependencyKey {
+  static let liveValue = SafariEffect { url in
+    let stream = AsyncStream<Bool> { continuation in
+      let task = Task { @MainActor in
+#if os(iOS)
+        let vc = SFSafariViewController(url: url)
+        UIApplication.shared.firstKeyWindow?.rootViewController?.present(vc, animated: true)
+        continuation.yield(true)
+        continuation.finish()
+#else
+        EnvironmentValues().openURL(url)
+        continuation.yield(true)
+        continuation.finish()
+#endif
+      }
+      continuation.onTermination = { @Sendable _ in
+        task.cancel()
+      }
+    }
+    return await stream.first(where: { _ in true }) ?? false
+  }
+  static let testValue = SafariEffect { _ in
+    XCTFail(#"Unimplemented: @Dependency(\.safari)"#)
+    return false
+  }
+}
+
+public struct SafariEffect: Sendable {
+  private let handler: @Sendable (URL) async -> Bool
+
+  public init(handler: @escaping @Sendable (URL) async -> Bool) {
+    self.handler = handler
+  }
+
+  @available(watchOS, unavailable)
+  @discardableResult
+  public func callAsFunction(_ url: URL) async -> Bool {
+    await self.handler(url)
+  }
+
+  @_disfavoredOverload
+  public func callAsFunction(_ url: URL) async {
+    _ = await self.handler(url)
+  }
+}
+
+#endif
+
+#if canImport(UIKit)
+import UIKit
+
+extension UIApplication {
+  @available(iOS 14.0, *)
+  var firstKeyWindow: UIWindow? {
+    if #available(iOS 15.0, *) {
+      return UIApplication.shared.connectedScenes
+        .compactMap { $0 as? UIWindowScene }
+        .filter { $0.activationState == .foregroundActive }
+        .first?.keyWindow
+    } else {
+      return UIApplication.shared.connectedScenes
+        .compactMap { $0 as? UIWindowScene }
+        .filter { $0.activationState == .foregroundActive }
+        .first?.windows
+        .first(where: \.isKeyWindow)
+    }
+  }
+}
+
+#endif