import SwiftUI
import AVFoundation
import SwiftBricks

/// ProgressSlider自定义Widget — 播放进度条+拖动seek
struct ProgressSliderWidget: View {
    let bridge: PlayerBridge
    let schema: ControlSchema
    @ObservedObject var engine: BricksEngine
    
    @State private var progress: Double = 0
    @State private var duration: Double = 0
    @State private var isDragging: Bool = false
    
    var body: some View {
        GeometryReader { geo in
            ZStack(alignment: .leading) {
                // 背景轨道
                RoundedRectangle(cornerRadius: 2)
                    .fill(Color.secondary.opacity(0.3))
                    .frame(height: 4)
                
                // 已播放进度
                RoundedRectangle(cornerRadius: 2)
                    .fill(Color.accentColor)
                    .frame(width: geo.size.width * progressRatio, height: 4)
                
                // 拖动滑块
                Circle()
                    .fill(Color.accentColor)
                    .frame(width: 14, height: 14)
                    .offset(x: geo.size.width * 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 duration > 0 {
                            let seekTime = ratio * duration
                            bridge.player.seek(to: CMTime(seconds: seekTime, preferredTimescale: 600))
                        }
                    }
                    .onEnded { _ in
                        isDragging = false
                    }
            )
        }
        .frame(height: 20)
        .onReceive(engine.store.$values) { values in
            if let val = values["progress_slider"] as? String {
                let parts = val.split(separator: "/")
                if parts.count == 2,
                   let cur = Double(parts[0]),
                   let total = Double(parts[1]) {
                    if !isDragging {
                        progress = cur
                        duration = total
                    }
                }
            }
        }
    }
    
    private var progressRatio: Double {
        guard duration > 0 else { return 0 }
        return max(0, min(1, progress / duration))
    }
}