import SwiftUI
import UIKit

struct GIFView: UIViewRepresentable {
    let name: String
    var onTap: (() -> Void)? = nil
    
    func makeUIView(context: Context) -> UIImageView {
        let imageView = UIImageView()
        
        // 加载GIF
        guard let url = Bundle.main.url(forResource: name, withExtension: "gif"),
              let data = try? Data(contentsOf: url),
              let image = UIImage.gif(data: data) else {
            return imageView
        }
        
        imageView.image = image
        imageView.contentMode = .scaleAspectFit
        
        // 添加点击手势
        if onTap != nil {
            imageView.isUserInteractionEnabled = true
            let tapGesture = UITapGestureRecognizer(target: context.coordinator, action: #selector(Coordinator.handleTap))
            imageView.addGestureRecognizer(tapGesture)
        }
        
        return imageView
    }
    
    func updateUIView(_ uiView: UIImageView, context: Context) {}
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    class Coordinator: NSObject {
        var parent: GIFView
        
        init(_ parent: GIFView) {
            self.parent = parent
        }
        
        @objc func handleTap() {
            parent.onTap?()
        }
    }
}

// UIImage的扩展，用于处理GIF
extension UIImage {
    static func gif(data: Data) -> UIImage? {
        guard let source = CGImageSourceCreateWithData(data as CFData, nil) else {
            print("无法创建CGImageSource")
            return nil
        }
        
        let count = CGImageSourceGetCount(source)
        var images = [UIImage]()
        var duration: TimeInterval = 0
        
        for i in 0..<count {
            guard let cgImage = CGImageSourceCreateImageAtIndex(source, i, nil) else {
                continue
            }
            
            duration += UIImage.gifDelayForImageAtIndex(source: source, index: i)
            images.append(UIImage(cgImage: cgImage, scale: UIScreen.main.scale, orientation: .up))
        }
        
        if count == 1 {
            return images.first
        } else {
            return UIImage.animatedImage(with: images, duration: duration)
        }
    }
    
    static func gifDelayForImageAtIndex(source: CGImageSource, index: Int) -> TimeInterval {
        var delay = 0.1
        
        let cfProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil)
        let properties = cfProperties as? [String: Any] ?? [:]
        let gifProperties = properties[kCGImagePropertyGIFDictionary as String] as? [String: Any] ?? [:]
        
        if let delayTime = gifProperties[kCGImagePropertyGIFUnclampedDelayTime as String] as? Double {
            delay = delayTime
        } else if let delayTime = gifProperties[kCGImagePropertyGIFDelayTime as String] as? Double {
            delay = delayTime
        }
        
        if delay < 0.011 {
            delay = 0.1
        }
        
        return delay
    }
}

// 使用示例 - 带点击事件
struct GIFWithTapExample: View {
    @State private var tapCount = 0
    
    var body: some View {
        VStack(spacing: 20) {
            Text("点击GIF图片")
                .font(.title)
            
            GIFView(name: "Blind") {
                // 点击事件处理
                Router.shared.navigate(to: .blindBox(mediaType: .video))
            }
            .frame(width: 300, height: 300)
            .border(Color.blue) // 可选：添加边框显示可点击区域
            
            Text("点击次数: \(tapCount)")
                .font(.subheadline)
        }
    }
}

struct GIFWithTapExample_Previews: PreviewProvider {
    static var previews: some View {
        GIFWithTapExample()
    }
}