migration

PediFoods/Components/CachedRemoteImage.swift

@@ -0,0 +1,146 @@
+import Foundation
+import SwiftUI
+import UIKit
+
+enum ImageFitMode {
+    /// Scale to cover the whole box, cropping whichever axis overflows.
+    /// Default — matches historical behavior for every image in the app.
+    case fill
+    /// Scale so height always matches the box exactly; width follows the
+    /// source's aspect ratio and gets cropped/gapped on the sides. Opt-in
+    /// only — used by the Store Detail cover header.
+    case heightFit
+}
+
+struct CachedRemoteImage<Placeholder: View>: View {
+    let imageURL: String?
+    let ttl: TimeInterval
+    let fitMode: ImageFitMode
+    let placeholder: Placeholder
+
+    @StateObject var loader = CachedRemoteImageLoader()
+
+    init(
+        imageURL: String?,
+        ttl: TimeInterval = AppCacheTTL.twoHours,
+        fitMode: ImageFitMode = .fill,
+        @ViewBuilder placeholder: () -> Placeholder
+    ) {
+        self.imageURL = imageURL
+        self.ttl = ttl
+        self.fitMode = fitMode
+        self.placeholder = placeholder()
+    }
+
+    var body: some View {
+        GeometryReader { geometry in
+            Group {
+                if let uiImage = loader.uiImage {
+                    rendered(image: Image(uiImage: uiImage), pixelSize: uiImage.size, in: geometry.size)
+                } else {
+                    placeholder
+                }
+            }
+            .frame(width: geometry.size.width, height: geometry.size.height)
+            .clipped()
+        }
+        .onAppear {
+            loader.load(imageURL: imageURL, ttl: ttl)
+        }
+        .onChange(of: imageURL) { _, newValue in
+            loader.load(imageURL: newValue, ttl: ttl)
+        }
+    }
+
+    @ViewBuilder
+    private func rendered(image: Image, pixelSize: CGSize, in containerSize: CGSize) -> some View {
+        switch fitMode {
+        case .fill:
+            image
+                .resizable()
+                .scaledToFill()
+        case .heightFit:
+            let aspect = pixelSize.height > 0 ? pixelSize.width / pixelSize.height : 1
+            let renderWidth = containerSize.height * aspect
+            image
+                .resizable()
+                .frame(width: renderWidth, height: containerSize.height)
+                .frame(width: containerSize.width, height: containerSize.height)
+        }
+    }
+}
+
+@MainActor
+final class CachedRemoteImageLoader: ObservableObject {
+    @Published var uiImage: UIImage?
+
+    private var currentKey: String?
+    private var task: Task<Void, Never>?
+
+    deinit {
+        task?.cancel()
+    }
+
+    func load(imageURL: String?, ttl: TimeInterval) {
+        let normalized = Self.normalizeImageSource(imageURL)
+        let key = normalized ?? ""
+        guard currentKey != key else { return }
+        currentKey = key
+
+        task?.cancel()
+
+        uiImage = nil
+
+        guard let normalized, normalized.isEmpty == false else { return }
+
+        let dataCacheKey = Self.dataURLCacheKey(normalized)
+        if let cachedDataImage: PlatformImage = AppContentCache.shared.value(for: dataCacheKey, as: PlatformImage.self) {
+            uiImage = cachedDataImage
+            return
+        }
+
+        if let image = Self.imageFromDataURL(normalized) {
+            AppContentCache.shared.set(image, for: dataCacheKey, ttl: ttl)
+            uiImage = image
+            return
+        }
+
+        guard let url = URL(string: normalized) else { return }
+
+        task = Task { [weak self] in
+            let image = await AppImageCache.shared.image(for: url, ttl: ttl)
+            guard Task.isCancelled == false else { return }
+            await MainActor.run {
+                self?.uiImage = image
+            }
+        }
+    }
+
+    private static func normalizeImageSource(_ value: String?) -> String? {
+        ImageSourceResolver.resolve(value)
+    }
+
+    private static func dataURLCacheKey(_ source: String) -> String {
+        let head = String(source.prefix(48))
+        let tail = String(source.suffix(48))
+        return "data-image:\(source.count):\(head):\(tail)"
+    }
+
+    private static func imageFromDataURL(_ source: String) -> PlatformImage? {
+        let lower = source.lowercased()
+        guard lower.hasPrefix("data:image"), let commaIndex = source.firstIndex(of: ",") else { return nil }
+
+        let header = String(source[..<commaIndex]).lowercased()
+        guard header.contains(";base64") else { return nil }
+
+        let payloadStart = source.index(after: commaIndex)
+        let payload = String(source[payloadStart...])
+            .replacingOccurrences(of: "\\/", with: "/")
+            .replacingOccurrences(of: "\n", with: "")
+            .replacingOccurrences(of: "\r", with: "")
+            .replacingOccurrences(of: " ", with: "")
+
+        guard let data = Data(base64Encoded: payload, options: [.ignoreUnknownCharacters]) else { return nil }
+        return UIImage(data: data)
+    }
+}