import SwiftUI
import AVFoundation

/// ProgressSlider — 纯SwiftUI进度条，拖动seek
struct ProgressSlider: View {
    let player: AVPlayer
    @ObservedObject var bridge: PlayerBridge
    @State private var isDragging = false
    
    var body: some View {
        GeometryReader { geo in
            ZStack(alignment: .leading) {
                RoundedRectangle(cornerRadius: 2)
                    .fill(Color.secondary.opacity(0.3))
                    .frame(height: 4)
                
                RoundedRectangle(cornerRadius: 2)
                    .fill(Color.accentColor)
                    .frame(width: geo.size.width * bridge.progressRatio, height: 4)
                
                Circle()
                    .fill(Color.accentColor)
                    .frame(width: 14, height: 14)
                    .offset(x: geo.size.width * bridge.progressRatio - 7)
                    .shadow(radius: 2)
            }
            .frame(height: 20)
            .contentShape(Rectangle())
            .gesture(
                DragGesture(minimumDistance: 0)
                    .onChanged { value in
                        isDragging = true
                        let ratio = max(0, min(1, value.location.x / geo.size.width))
                        if bridge.cachedDuration > 0 {
                            let seekTime = ratio * bridge.cachedDuration
                            player.seek(to: CMTime(seconds: seekTime, preferredTimescale: 600))
                        }
                    }
                    .onEnded { _ in
                        isDragging = false
                    }
            )
        }
        .frame(height: 20)
    }
}