import SwiftUI

// MARK: - 扫描界面覆盖层
struct ScanningOverlayView: View {
    let showPreviewPause: Bool
    let detectedCodesCount: Int
    let onImageDecode: () -> Void
    
    var body: some View {
        VStack {
            Spacer()
            
            // 扫描线组件
            if !showPreviewPause {
                ScanningLineView(style: .modern)
            }
            
            // 提示文本
            ScanningInstructionView(
                showPreviewPause: showPreviewPause,
                detectedCodesCount: detectedCodesCount
            )
            
            Spacer()
            
            // 底部按钮区域
            ScanningBottomButtonsView(
                showPreviewPause: showPreviewPause,
                onImageDecode: onImageDecode
            )
        }
    }
}

// MARK: - 扫描指令视图
struct ScanningInstructionView: View {
    @EnvironmentObject var languageManager: LanguageManager
    let showPreviewPause: Bool
    let detectedCodesCount: Int
    
    var body: some View {
        if showPreviewPause {
            VStack(spacing: 8) {
                Text("detected_codes".localized)
                    .foregroundColor(.white)
                    .font(.headline)
                    .id(languageManager.refreshTrigger)
                
                if detectedCodesCount == 1 {
                    Text("auto_result_1s".localized)
                        .foregroundColor(.green)
                        .font(.subheadline)
                        .id(languageManager.refreshTrigger)
                } else {
                    Text("select_code_instruction".localized)
                        .foregroundColor(.white.opacity(0.8))
                        .font(.subheadline)
                        .id(languageManager.refreshTrigger)
                }
            }
            .padding(.top, 20)
        } else {
            Text("scan_instruction".localized)
                .foregroundColor(.white)
                .font(.headline)
                .padding(.top, 20)
                .id(languageManager.refreshTrigger)
        }
    }
}

// MARK: - 扫描底部按钮视图
struct ScanningBottomButtonsView: View {
    let showPreviewPause: Bool
    let onImageDecode: () -> Void
    
    var body: some View {
        VStack(spacing: 15) {
            // 图片解码按钮
            if !showPreviewPause {
                Button(action: {
                    onImageDecode()
                }) {
                    HStack(spacing: 8) {
                        Image(systemName: "photo.on.rectangle.angled")
                            .font(.system(size: 16, weight: .semibold))
                        
                        Text("image_decode".localized)
                            .font(.subheadline)
                            .fontWeight(.medium)
                    }
                    .foregroundColor(.white)
                    .padding(.horizontal, 16)
                    .padding(.vertical, 10)
                    .background(
                        RoundedRectangle(cornerRadius: 12)
                            .fill(Color.blue.opacity(0.3))
                            .overlay(
                                RoundedRectangle(cornerRadius: 12)
                                    .stroke(Color.blue.opacity(0.6), lineWidth: 1)
                            )
                    )
                }
                .buttonStyle(PlainButtonStyle())
            }
            
            // 移除关闭按钮，因为现在使用导航返回
        }
        .padding(.bottom, 50)
    }
}

// MARK: - 扫描线样式选择器
struct ScanningStyleSelectorView: View {
    @EnvironmentObject var languageManager: LanguageManager
    @Binding var selectedStyle: ScanningLineStyle
    
    var body: some View {
        VStack(spacing: 12) {
            // 标题
            Text("scanning_line_style".localized)
                .font(.caption)
                .foregroundColor(.white.opacity(0.8))
                .padding(.bottom, 4)
            
            // 样式选择器
            HStack(spacing: 8) {
                ForEach(ScanningLineStyle.allCases, id: \.self) { style in
                    Button(action: {
                        withAnimation(.easeInOut(duration: 0.2)) {
                            selectedStyle = style
                        }
                        
                        // 添加触觉反馈
                        let impactFeedback = UIImpactFeedbackGenerator(style: .light)
                        impactFeedback.impactOccurred()
                    }) {
                        VStack(spacing: 4) {
                            // 样式预览
                            stylePreview(style)
                                .frame(width: 24, height: 24)
                            
                            // 样式名称
                            Text(style.getLocalizedName(languageManager: languageManager))
                                .font(.caption2)
                                .foregroundColor(.white)
                                .id(languageManager.refreshTrigger)
                        }
                        .frame(width: 60, height: 50)
                        .background(
                            RoundedRectangle(cornerRadius: 12)
                                .fill(selectedStyle == style ? 
                                      Color.green.opacity(0.8) : 
                                      Color.black.opacity(0.6))
                                .overlay(
                                    RoundedRectangle(cornerRadius: 12)
                                        .stroke(selectedStyle == style ? 
                                               Color.green : 
                                               Color.white.opacity(0.3), 
                                               lineWidth: selectedStyle == style ? 2 : 1)
                                )
                        )
                    }
                    .buttonStyle(PlainButtonStyle())
                }
            }
        }
        .padding(.horizontal, 16)
        .padding(.vertical, 12)
        .background(
            RoundedRectangle(cornerRadius: 16)
                .fill(Color.black.opacity(0.7))
                .overlay(
                    RoundedRectangle(cornerRadius: 16)
                        .stroke(Color.white.opacity(0.2), lineWidth: 1)
                )
        )
        .padding(.bottom, 10)
    }
    
    // 样式预览
    @ViewBuilder
    private func stylePreview(_ style: ScanningLineStyle) -> some View {
        switch style {
        case .modern:
            Rectangle()
                .fill(
                    LinearGradient(
                        colors: [.blue, .cyan, .blue],
                        startPoint: .leading,
                        endPoint: .trailing
                    )
                )
                .frame(width: 20, height: 2)
                .shadow(color: .blue, radius: 2, x: 0, y: 0)
        case .classic:
            Rectangle()
                .fill(Color.green)
                .frame(width: 16, height: 2)
        case .neon:
            Rectangle()
                .fill(Color.purple)
                .frame(width: 18, height: 3)
                .shadow(color: .purple, radius: 3, x: 0, y: 0)
        case .minimal:
            Rectangle()
                .fill(Color.white)
                .frame(width: 14, height: 1)
        case .retro:
            Rectangle()
                .fill(Color.orange)
                .frame(width: 20, height: 2)
                .overlay(
                    Rectangle()
                        .stroke(Color.yellow, lineWidth: 0.5)
                        .frame(width: 18, height: 1.5)
                )
        }
    }
}