//
//  ScenicPromotionMediaArtworkView.swift
//  suixinkan
//
//  Created by Codex on 2026/7/2.
//

import SwiftUI

/// 宣传页素材图片渲染组件，支持缩略图与主视觉两种尺寸。
struct ScenicPromotionMediaArtwork: View {
    let media: ScenicPromotionMedia
    let compact: Bool
    let useHeroAsset: Bool

    var body: some View {
        GeometryReader { proxy in
            if let assetName = useHeroAsset ? (media.heroAssetName ?? media.assetName) : media.assetName {
                Image(assetName)
                    .resizable()
                    .scaledToFill()
                    .frame(width: proxy.size.width, height: proxy.size.height)
                    .clipped()
            } else {
                ZStack {
                    LinearGradient(
                        colors: media.palette.map { Color(hex: $0) },
                        startPoint: .topLeading,
                        endPoint: .bottomTrailing
                    )

                    ScenicPromotionMountainLayer()
                        .fill(.white.opacity(0.28))
                        .frame(height: proxy.size.height * 0.45)
                        .offset(y: proxy.size.height * 0.02)

                    ScenicPromotionMountainLayer()
                        .fill(Color(hex: 0x0F5B85, alpha: 0.22))
                        .frame(height: proxy.size.height * 0.38)
                        .offset(y: proxy.size.height * 0.13)

                    VStack {
                        Spacer()
                        Rectangle()
                            .fill(Color(hex: 0x2D9D4E, alpha: 0.52))
                            .frame(height: proxy.size.height * 0.2)
                    }

                    if !compact {
                        Image(systemName: "figure.walk")
                            .font(.system(size: 74, weight: .bold))
                            .foregroundStyle(.white.opacity(0.82))
                            .offset(x: proxy.size.width * 0.23, y: proxy.size.height * 0.1)
                    }
                }
            }
        }
        .clipShape(RoundedRectangle(cornerRadius: compact ? 12 : 18))
    }
}

/// 没有本地图片资源时使用的备用山形占位图。
struct ScenicPromotionMountainLayer: Shape {
    func path(in rect: CGRect) -> Path {
        var path = Path()
        path.move(to: CGPoint(x: rect.minX, y: rect.maxY))
        path.addLine(to: CGPoint(x: rect.width * 0.16, y: rect.height * 0.42))
        path.addLine(to: CGPoint(x: rect.width * 0.28, y: rect.height * 0.68))
        path.addLine(to: CGPoint(x: rect.width * 0.42, y: rect.height * 0.25))
        path.addLine(to: CGPoint(x: rect.width * 0.58, y: rect.height * 0.6))
        path.addLine(to: CGPoint(x: rect.width * 0.76, y: rect.height * 0.18))
        path.addLine(to: CGPoint(x: rect.maxX, y: rect.height * 0.56))
        path.addLine(to: CGPoint(x: rect.maxX, y: rect.maxY))
        path.closeSubpath()
        return path
    }
}

#if DEBUG
#Preview("素材缩略图") {
    ScenicPromotionMediaArtwork(
        media: ScenicPromotionPreviewSupport.sampleVideoMedia,
        compact: true,
        useHeroAsset: false
    )
    .frame(width: 72, height: 66)
    .padding()
}

#Preview("素材主视觉") {
    ScenicPromotionMediaArtwork(
        media: ScenicPromotionPreviewSupport.sampleVideoMedia,
        compact: false,
        useHeroAsset: true
    )
    .frame(maxWidth: .infinity)
    .frame(height: 220)
    .padding()
}
#endif