//
//  CachedAsyncImage.swift
//  Mobile Music Assistant
//
//  Created by Sven Hanold on 26.03.26.
//

import SwiftUI

/// AsyncImage with URLCache support for album covers
struct CachedAsyncImage<Content: View, Placeholder: View>: View {
    let url: URL?
    let content: (Image) -> Content
    let placeholder: () -> Placeholder
    
    @State private var image: UIImage?
    @State private var isLoading = false
    
    init(
        url: URL?,
        @ViewBuilder content: @escaping (Image) -> Content,
        @ViewBuilder placeholder: @escaping () -> Placeholder
    ) {
        self.url = url
        self.content = content
        self.placeholder = placeholder
    }
    
    var body: some View {
        Group {
            if let image {
                content(Image(uiImage: image))
            } else {
                placeholder()
                    .task {
                        await loadImage()
                    }
            }
        }
    }
    
    private func loadImage() async {
        guard let url, !isLoading else { return }
        
        isLoading = true
        defer { isLoading = false }
        
        // Configure URLCache if needed
        configureURLCache()
        
        do {
            let (data, _) = try await URLSession.shared.data(from: url)
            if let uiImage = UIImage(data: data) {
                await MainActor.run {
                    image = uiImage
                }
            }
        } catch {
            print("Failed to load image: \(error.localizedDescription)")
        }
    }
    
    private func configureURLCache() {
        let cache = URLCache.shared
        if cache.diskCapacity < 50_000_000 {
            URLCache.shared = URLCache(
                memoryCapacity: 10_000_000,  // 10 MB
                diskCapacity: 50_000_000      // 50 MB
            )
        }
    }
}

// MARK: - Convenience Initializers

extension CachedAsyncImage where Content == Image, Placeholder == Color {
    init(url: URL?) {
        self.init(
            url: url,
            content: { $0.resizable() },
            placeholder: { Color.gray.opacity(0.2) }
        )
    }
}