import SwiftUI
import CoreData
import QRCode
internal import SwiftImageReadWrite

struct QRCodeDetailView: View {
    let historyItem: HistoryItem
    @EnvironmentObject var coreDataManager: CoreDataManager
    @State private var qrCodeImage: UIImage?
    @State private var showingShareSheet = false
    @State private var showingAlert = false
    @State private var alertMessage = ""
    @State private var navigateToStyleView = false
    
    var body: some View {
        ScrollView {
            VStack(spacing: 20) {
                // 二维码图片
                qrCodeStyleSection
                
                // 解析后的详细信息
                parsedInfoSection
                
                // 原始内容
                originalContentSection
                
                // 操作按钮
                actionButtonsSection
                
                // Decorate code按钮
                decorateCodeButton
            }
            .padding()
        }
        .navigationTitle(getNavigationTitle())
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button(action: {
                    showingShareSheet = true
                }) {
                    Image(systemName: "square.and.arrow.up")
                }
            }
        }
        .onAppear {
            generateQRCodeImage()
        }
        .sheet(isPresented: $showingShareSheet) {
            ShareSheet(activityItems: [historyItem.content ?? ""])
        }
        .alert("tip".localized, isPresented: $showingAlert) {
Button("confirm".localized) { }
        } message: {
            Text(alertMessage)
        }
        .background(
            NavigationLink(
                destination: QRCodeStyleView(
                    qrCodeContent: historyItem.content ?? "",
                    qrCodeType: getQRCodeType(),
                    existingStyleData: getStyleData(),
                    historyItem: historyItem
                ),
                isActive: $navigateToStyleView
            ) {
                EmptyView()
            }
        )
    }
    
    // MARK: - 二维码图片视图
    private var qrCodeImageView: some View {
        VStack(spacing: 16) {
            if let qrCodeImage = qrCodeImage {
                Image(uiImage: qrCodeImage)
                    .resizable()
                    .aspectRatio(contentMode: .fit)
                    .frame(width: 200, height: 200)
                    .cornerRadius(12)
                    .shadow(radius: 8)
            } else {
                RoundedRectangle(cornerRadius: 12)
                    .fill(Color.gray.opacity(0.3))
                    .frame(width: 200, height: 200)
                    .overlay(
                        ProgressView()
                            .scaleEffect(1.5)
                    )
            }
            
            Text("scan_this_qr_code".localized)
                .font(.caption)
                .foregroundColor(.secondary)
        }
    }
    

    
    // MARK: - 解析后的详细信息
    private var parsedInfoSection: some View {
        VStack(alignment: .leading, spacing: 12) {
            HStack {
                Image(systemName: "info.circle")
                    .font(.title2)
                    .foregroundColor(.green)
                
                Text("parsed_info".localized)
                    .font(.headline)
                
                Spacer()
            }
            
            if let content = historyItem.content {
                let parsedData = QRCodeParser.parseQRCode(content)
                
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Image(systemName: parsedData.icon)
                            .font(.title3)
                            .foregroundColor(.green)
                        
                        Text(parsedData.title)
                            .font(.title3)
                            .fontWeight(.medium)
                        
                        Spacer()
                    }
                    
                    if let subtitle = parsedData.subtitle {
                        Text(subtitle)
                            .font(.body)
                            .foregroundColor(.secondary)
                            .multilineTextAlignment(.leading)
                    }
                }
                .padding()
                .background(Color.green.opacity(0.1))
                .cornerRadius(8)
            }
        }
        .padding()
        .background(Color(.systemBackground))
        .cornerRadius(12)
        .shadow(radius: 2)
    }
    
    // MARK: - 原始内容
    private var originalContentSection: some View {
        VStack(alignment: .leading, spacing: 12) {
            HStack {
                Image(systemName: "doc.text")
                    .font(.title2)
                    .foregroundColor(.purple)
                
                Text("original_content".localized)
                    .font(.headline)
                
                Spacer()
            }
            
            if let content = historyItem.content {
                ScrollView {
                    Text(content)
                        .font(.system(.body, design: .monospaced))
                        .foregroundColor(.secondary)
                        .multilineTextAlignment(.leading)
                        .padding()
                        .frame(maxWidth: .infinity, alignment: .leading)
                }
                .frame(maxHeight: 200)
                .background(Color.purple.opacity(0.1))
                .cornerRadius(8)
            }
        }
        .padding()
        .background(Color(.systemBackground))
        .cornerRadius(12)
        .shadow(radius: 2)
    }
    
    // MARK: - 二维码样式信息
    private var qrCodeStyleSection: some View {
        VStack(spacing: 0) {
            if let styleData = getStyleData() {
                // 使用样式生成二维码预览
                VStack(spacing: 16) {
                    // 样式预览二维码
                    if let previewImage = generateStylePreviewImage(styleData: styleData) {
                        Image(uiImage: previewImage)
                            .resizable()
                            .aspectRatio(contentMode: .fit)
                            .frame(maxWidth: 200, maxHeight: 200)
                            .padding()
                            .background(Color.white)
                            .cornerRadius(12)
                            .shadow(radius: 4)
                    }
                    
                    // 样式标签
                    HStack(spacing: 8) {
                        Label("custom".localized, systemImage: "paintpalette")
                            .font(.caption)
                            .padding(.horizontal, 8)
                            .padding(.vertical, 4)
                            .background(Color.purple.opacity(0.2))
                            .foregroundColor(.purple)
                            .cornerRadius(6)
                    }
                }
                .padding()
                .background(Color.purple.opacity(0.05))
                .cornerRadius(12)
            } else {
                // 标准样式预览
                VStack(spacing: 16) {
                    if let standardImage = generateStandardQRCodeImage() {
                        Image(uiImage: standardImage)
                            .resizable()
                            .aspectRatio(contentMode: .fit)
                            .frame(maxWidth: 200, maxHeight: 200)
                            .padding()
                            .background(Color.white)
                            .cornerRadius(12)
                            .shadow(radius: 4)
                    }
                    
                    Label("standard".localized, systemImage: "qrcode")
                        .font(.caption)
                        .padding(.horizontal, 8)
                        .padding(.vertical, 4)
                        .background(Color.gray.opacity(0.2))
                        .foregroundColor(.gray)
                        .cornerRadius(6)
                }
                .padding()
                .background(Color.gray.opacity(0.05))
                .cornerRadius(12)
            }
        }
        .padding()
    }
    
    // MARK: - 操作按钮
    private var actionButtonsSection: some View {
        VStack(spacing: 12) {
            // 收藏按钮
            Button(action: toggleFavorite) {
                HStack {
                    Image(systemName: historyItem.isFavorite ? "heart.fill" : "heart")
                        .foregroundColor(historyItem.isFavorite ? .red : .gray)
                    
                    Text(historyItem.isFavorite ? "unfavorite".localized : "favorite".localized)
                        .fontWeight(.medium)
                }
                .frame(maxWidth: .infinity)
                .padding()
                .background(historyItem.isFavorite ? Color.red.opacity(0.1) : Color.gray.opacity(0.1))
                .foregroundColor(historyItem.isFavorite ? .red : .gray)
                .cornerRadius(10)
            }
            
            // 复制内容按钮
            Button(action: copyContent) {
                HStack {
                    Image(systemName: "doc.on.doc")
                        .foregroundColor(.blue)
                    
                    Text("copy_content".localized)
                        .fontWeight(.medium)
                }
                .frame(maxWidth: .infinity)
                .padding()
                .background(Color.blue.opacity(0.1))
                .foregroundColor(.blue)
                .cornerRadius(10)
            }
            
            // 打开链接按钮（如果是URL类型）
            if let content = historyItem.content, canOpenURL(content) {
                Button(action: { openURL(content) }) {
                    HStack {
                        Image(systemName: "arrow.up.right.square")
                            .foregroundColor(.green)
                        
                        Text("open_link".localized)
                            .fontWeight(.medium)
                    }
                    .frame(maxWidth: .infinity)
                    .padding()
                    .background(Color.green.opacity(0.1))
                    .foregroundColor(.green)
                    .cornerRadius(10)
                }
            }
        }
        .padding()
        .background(Color(.systemBackground))
        .cornerRadius(12)
        .shadow(radius: 2)
    }
    
    // MARK: - 生成二维码图片
    private func generateQRCodeImage() {
        guard let content = historyItem.content else { return }
        
        do {
            let imageData = try QRCode.build
               .text(content)
               .quietZonePixelCount(3)
               .foregroundColor(CGColor(srgbRed: 1, green: 0, blue: 0.6, alpha: 1))
               .backgroundColor(CGColor(srgbRed: 0, green: 0, blue: 0.2, alpha: 1))
               .background.cornerRadius(3)
               .onPixels.shape(QRCode.PixelShape.CurvePixel())
               .eye.shape(QRCode.EyeShape.Teardrop())
               .generate.image(dimension: 600, representation: .png())
            
            self.qrCodeImage = UIImage(data: imageData)
            
        } catch {
            print("生成二维码失败: \(error)")
        }
    }
    
    // MARK: - 切换收藏状态
    private func toggleFavorite() {
        historyItem.isFavorite.toggle()
        coreDataManager.save()
        
        let message = historyItem.isFavorite ? "added_to_favorites".localized : "removed_from_favorites".localized
        alertMessage = message
        showingAlert = true
    }
    
    // MARK: - 复制内容
    private func copyContent() {
        if let content = historyItem.content {
            UIPasteboard.general.string = content
            alertMessage = "content_copied_to_clipboard".localized
            showingAlert = true
        }
    }
    
    // MARK: - 检查是否可以打开URL
    private func canOpenURL(_ string: String) -> Bool {
        guard let url = URL(string: string) else { return false }
        return UIApplication.shared.canOpenURL(url)
    }
    
    // MARK: - 打开URL
    private func openURL(_ string: String) {
        guard let url = URL(string: string) else { return }
        UIApplication.shared.open(url)
    }
}

// MARK: - 分享表单
struct ShareSheet: UIViewControllerRepresentable {
    let activityItems: [Any]
    
    func makeUIViewController(context: Context) -> UIActivityViewController {
        let controller = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
        return controller
    }
    
    func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {}
}

#Preview("Wi‑Fi") {
    let ctx = PreviewData.context
    let item = PreviewData.wifiSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("URL") {
    let ctx = PreviewData.context
    let item = PreviewData.urlSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("SMS") {
    let ctx = PreviewData.context
    let item = PreviewData.smsSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("vCard") {
    let ctx = PreviewData.context
    let item = PreviewData.vcardSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("Instagram") {
    let ctx = PreviewData.context
    let item = PreviewData.instagramSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("WhatsApp") {
    let ctx = PreviewData.context
    let item = PreviewData.whatsappSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("Viber") {
    let ctx = PreviewData.context
    let item = PreviewData.viberSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("Text") {
    let ctx = PreviewData.context
    let item = PreviewData.textSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

#Preview("MeCard") {
    let ctx = PreviewData.context
    let item = PreviewData.mecardSample(in: ctx)
    NavigationView { QRCodeDetailView(historyItem: item) }
}

// MARK: - Preview Data
private enum PreviewData {
    static let context: NSManagedObjectContext = {
        let container = NSPersistentContainer(name: "MyQrCode")
        let description = NSPersistentStoreDescription()
        description.type = NSInMemoryStoreType
        container.persistentStoreDescriptions = [description]
        container.loadPersistentStores { _, _ in }
        return container.viewContext
    }()

    private static func makeBaseItem(in context: NSManagedObjectContext, content: String, qrType: QRCodeType, favorite: Bool = false) -> HistoryItem {
        let item = HistoryItem(context: context)
        item.id = UUID()
        item.content = content
        item.dataType = DataType.qrcode.rawValue
        item.dataSource = DataSource.created.rawValue
        item.createdAt = Date()
        item.isFavorite = favorite
        item.qrCodeType = qrType.rawValue
        return item
    }

    static func wifiSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "WIFI:T:WPA;S:MyNetwork;P:MyPassword;;"
        return makeBaseItem(in: context, content: content, qrType: .wifi, favorite: true)
    }

    static func urlSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "https://www.example.com"
        return makeBaseItem(in: context, content: content, qrType: .url)
    }

    static func smsSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "SMSTO:+1 (555) 123-4567:Hello"
        return makeBaseItem(in: context, content: content, qrType: .sms)
    }

    static func vcardSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = """
        BEGIN:VCARD
        VERSION:3.0
        N:Doe;John;;;
        FN:John Doe
        TEL;TYPE=WORK,CELL:(123) 456-7890
        EMAIL;TYPE=PREF,INTERNET:john.doe@example.com
        ORG:Example Company
        TITLE:Software Engineer
        ADR;TYPE=WORK:;;123 Main St;Anytown;CA;12345;USA
        URL:https://example.com
        END:VCARD
        """.trimmingCharacters(in: .whitespacesAndNewlines)
        return makeBaseItem(in: context, content: content, qrType: .vcard)
    }

    static func instagramSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "instagram://user?username=example_user"
        return makeBaseItem(in: context, content: content, qrType: .instagram)
    }

    static func whatsappSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "whatsapp://send?phone=+1234567890"
        return makeBaseItem(in: context, content: content, qrType: .whatsapp)
    }

    static func textSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "Hello, this is a text message!"
        return makeBaseItem(in: context, content: content, qrType: .text)
    }
    
    static func viberSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "viber://add?number=+1234567890"
        return makeBaseItem(in: context, content: content, qrType: .viber)
    }
    
    static func mecardSample(in context: NSManagedObjectContext) -> HistoryItem {
        let content = "MECARD:N:Doe,John;NICKNAME:Johnny;TEL:+1234567890;EMAIL:john.doe@example.com;ORG:Example Company;TITLE:Software Engineer;ADR:123 Main St,Anytown,CA,12345,USA;URL:https://example.com;NOTE:This is a note;"
        return makeBaseItem(in: context, content: content, qrType: .mecard)
    }
}

// MARK: - 样式信息辅助方法
extension QRCodeDetailView {
    // MARK: - 生成样式预览图片
    private func generateStylePreviewImage(styleData: QRCodeStyleData) -> UIImage? {
        guard let content = historyItem.content else { return nil }
        
        do {
            var qrCodeBuilder = try QRCode.build
                .text(content)
                .quietZonePixelCount(0)
            
            // 设置前景色
            if let foregroundColor = getColorFromString(styleData.foregroundColor) {
                qrCodeBuilder = qrCodeBuilder.foregroundColor(foregroundColor)
            }
            
            // 设置背景色
            if let backgroundColor = getColorFromString(styleData.backgroundColor) {
                qrCodeBuilder = qrCodeBuilder.backgroundColor(backgroundColor)
            }
            
            // 设置背景圆角
            qrCodeBuilder = qrCodeBuilder.background.cornerRadius(3)
            
            // 设置点类型
            if let dotType = getDotTypeFromString(styleData.dotType) {
                qrCodeBuilder = qrCodeBuilder.onPixels.shape(dotType)
            }
            
            // 设置眼睛类型
            if let eyeType = getEyeTypeFromString(styleData.eyeType) {
                qrCodeBuilder = qrCodeBuilder.eye.shape(eyeType)
            }
            
            // 设置Logo（如果有的话）
            if let logo = styleData.logo, !logo.isEmpty {
                if let logoTemplate = getLogoFromString(logo) {
                    qrCodeBuilder = qrCodeBuilder.logo(logoTemplate)
                }
            }
            
            // 生成图片
            let imageData = try qrCodeBuilder.generate.image(dimension: 300, representation: .png())
            return UIImage(data: imageData)
            
        } catch {
            print("生成样式预览图片失败: \(error)")
            return nil
        }
    }
    
    // MARK: - 生成标准二维码图片
    private func generateStandardQRCodeImage() -> UIImage? {
        guard let content = historyItem.content else { return nil }
        
        do {
            let imageData = try QRCode.build
                .text(content)
                .quietZonePixelCount(0)
                .foregroundColor(CGColor(srgbRed: 0, green: 0, blue: 0, alpha: 1))
                .backgroundColor(CGColor(srgbRed: 1, green: 1, blue: 1, alpha: 1))
                .generate.image(dimension: 300, representation: .png())
            
            return UIImage(data: imageData)
            
        } catch {
            print("生成标准二维码图片失败: \(error)")
            return nil
        }
    }
    
    // MARK: - 颜色转换
    private func getColorFromString(_ colorString: String) -> CGColor? {
        if let color = QRCodeColor(rawValue: colorString) {
            return color.cgColor
        }
        return nil
    }
    
    // MARK: - 点类型转换
    private func getDotTypeFromString(_ dotTypeString: String) -> QRCodePixelShapeGenerator? {
        if let dotType = QRCodeDotType(rawValue: dotTypeString) {
            return dotType.pixelShape
        }
        return nil
    }
    
    // MARK: - 眼睛类型转换
    private func getEyeTypeFromString(_ eyeTypeString: String) -> QRCodeEyeShapeGenerator? {
        if let eyeType = QRCodeEyeType(rawValue: eyeTypeString) {
            return eyeType.eyeShape
        }
        return nil
    }
    
    // MARK: - Logo转换
    private func getLogoFromString(_ logoString: String) -> QRCode.LogoTemplate? {
        // 检查是否是自定义Logo
        if logoString.hasPrefix("custom_") {
            // 从样式数据中获取自定义Logo图片
            if let styleData = getStyleData(),
               let customImage = styleData.customLogoImage,
               let cgImage = customImage.cgImage {
                return QRCode.LogoTemplate.CircleCenter(image: cgImage, inset: 0)
            }
        } else {
            // 预设Logo
            if let logo = QRCodeLogo(rawValue: logoString),
               let image = logo.image,
               let cgImage = image.cgImage {
                return QRCode.LogoTemplate.CircleCenter(image: cgImage)
            }
        }
        return nil
    }
    
    // MARK: - 从JSON字符串解析样式数据
    private func getStyleData() -> QRCodeStyleData? {
        guard let jsonString = historyItem.qrCodeStyleData,
              let jsonData = jsonString.data(using: .utf8) else {
            return nil
        }
        
        do {
            let styleData = try JSONDecoder().decode(QRCodeStyleData.self, from: jsonData)
            return styleData
        } catch {
            print("❌ 样式数据JSON解码失败：\(error)")
            return nil
        }
    }
    
    // MARK: - 显示名称转换方法（保留原有方法）
    private func getColorDisplayName(_ colorString: String) -> String {
        if let color = QRCodeColor(rawValue: colorString) {
            switch color {
            case .black: return "black".localized
case .white: return "white".localized
case .red: return "red".localized
case .blue: return "blue".localized
case .green: return "green".localized
case .yellow: return "yellow".localized
case .purple: return "purple".localized
case .orange: return "orange".localized
case .pink: return "pink".localized
case .cyan: return "cyan".localized
case .magenta: return "magenta".localized
case .brown: return "brown".localized
case .gray: return "gray".localized
case .navy: return "navy".localized
case .teal: return "teal".localized
case .indigo: return "indigo".localized
case .lime: return "lime".localized
case .maroon: return "maroon".localized
case .olive: return "olive".localized
case .silver: return "silver".localized
            }
        }
        return colorString
    }
    
    private func getDotTypeDisplayName(_ dotTypeString: String) -> String {
        if let dotType = QRCodeDotType(rawValue: dotTypeString) {
            return dotType.displayName
        }
        return dotTypeString
    }
    
    private func getEyeTypeDisplayName(_ eyeTypeString: String) -> String {
        if let eyeType = QRCodeEyeType(rawValue: eyeTypeString) {
            return eyeType.displayName
        }
        return eyeTypeString
    }
    
    private func getLogoDisplayName(_ logoString: String) -> String {
        if let logo = QRCodeLogo(rawValue: logoString) {
            return logo.displayName
        }
        return logoString
    }
    
    // MARK: - 获取二维码类型
    private func getQRCodeType() -> QRCodeType {
        if let qrCodeTypeString = historyItem.qrCodeType,
           let qrCodeType = QRCodeType(rawValue: qrCodeTypeString) {
            return qrCodeType
        }
        return .text // 默认返回text类型
    }
    
    // MARK: - 获取导航标题
    private func getNavigationTitle() -> String {
        if let qrCodeTypeString = historyItem.qrCodeType,
           let qrCodeType = QRCodeType(rawValue: qrCodeTypeString) {
            return qrCodeType.displayName
        }
        return "qr_code_detail".localized
    }
    
    // MARK: - Decorate code按钮
    private var decorateCodeButton: some View {
        VStack(spacing: 16) {
            Button(action: {
                navigateToCustomStyle()
            }) {
                HStack(spacing: 12) {
                    Image(systemName: "paintpalette.fill")
                        .font(.title2)
                        .foregroundColor(.white)
                    
                    Text("decorate_code".localized)
                        .font(.headline)
                        .fontWeight(.semibold)
                        .foregroundColor(.white)
                    
                    Spacer()
                    
                    Image(systemName: "chevron.right")
                        .font(.system(size: 14, weight: .medium))
                        .foregroundColor(.white.opacity(0.8))
                }
                .padding(.horizontal, 20)
                .padding(.vertical, 16)
                .background(
                    LinearGradient(
                        gradient: Gradient(colors: [Color.purple, Color.blue]),
                        startPoint: .leading,
                        endPoint: .trailing
                    )
                )
                .cornerRadius(12)
                .shadow(color: .purple.opacity(0.3), radius: 8, x: 0, y: 4)
            }
            .buttonStyle(PlainButtonStyle())
            
            // 如果有现有样式，显示提示
            if getStyleData() != nil {
                HStack {
                    Image(systemName: "info.circle.fill")
                        .font(.caption)
                        .foregroundColor(.orange)
                    
                    Text("qr_code_has_style".localized)
                        .font(.caption)
                        .foregroundColor(.secondary)
                    
                    Spacer()
                }
                .padding(.horizontal, 4)
            }
        }
        .padding()
        .background(Color(.systemBackground))
        .cornerRadius(12)
        .shadow(radius: 2)
    }
    
    // MARK: - 跳转到自定义样式界面
    private func navigateToCustomStyle() {
        navigateToStyleView = true
    }
}