import SwiftUI
import QRCode
import CoreData

// MARK: - 自定义二维码样式界面
struct QRCodeStyleView: View {
    let qrCodeContent: String
    @Environment(\.dismiss) private var dismiss
    @StateObject private var coreDataManager = CoreDataManager.shared
    
    // 颜色选择
    @State private var selectedForegroundColor: QRCodeColor = .black
    @State private var selectedBackgroundColor: QRCodeColor = .white
    
    // 点类型选择
    @State private var selectedDotType: QRCodeDotType = .square
    
    // 眼睛类型选择
    @State private var selectedEyeType: QRCodeEyeType = .square
    
    // Logo选择
    @State private var selectedLogo: QRCodeLogo? = nil
    
    // 生成的二维码图片
    @State private var qrCodeImage: UIImage?
    @State private var isLoading = false
    
    // 创建QRCode文档
    private func createQRCodeDocument() -> QRCode.Document {
        let d = try! QRCode.Document(engine: QRCodeEngineExternal())
        
        // 使用传入的二维码内容
        d.utf8String = qrCodeContent
        
        // 设置背景色
        d.design.backgroundColor(selectedBackgroundColor.cgColor)
        
        // 设置眼睛样式
        d.design.style.eye = QRCode.FillStyle.Solid(selectedForegroundColor.cgColor)
        d.design.style.eyeBackground = selectedBackgroundColor.cgColor
        
        // 设置点样式
        d.design.shape.onPixels = selectedDotType.pixelShape
        d.design.style.onPixels = QRCode.FillStyle.Solid(selectedForegroundColor.cgColor)
        d.design.style.onPixelsBackground = selectedBackgroundColor.cgColor
        
        d.design.shape.offPixels = selectedDotType.pixelShape
        d.design.style.offPixels = QRCode.FillStyle.Solid(selectedBackgroundColor.cgColor)
        d.design.style.offPixelsBackground = selectedBackgroundColor.cgColor
        
        // 设置眼睛形状
        d.design.shape.eye = selectedEyeType.eyeShape
        
        // 如果有选择的Logo，设置背景图片
        if let selectedLogo = selectedLogo {
            // 这里可以添加Logo图片设置
            // d.design.style.background = QRCode.FillStyle.Image(selectedLogo.image)
        }
        
        return d
    }

    var body: some View {
        VStack(spacing: 0) {
            // 二维码预览区域
            qrCodePreviewSection
            
            // 样式选择区域
            styleSelectionSection
        }
        .navigationTitle("自定义样式")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button("保存") {
                    saveQRCode()
                }
                .font(.system(size: 16, weight: .semibold))
            }
        }
        .onAppear {
        }
    }
    
    // MARK: - 二维码预览区域
    private var qrCodePreviewSection: some View {
        VStack(spacing: 16) {
            QRCodeDocumentUIView(document: createQRCodeDocument())
                .frame(width: 300, height: 300)
        }
        .padding()
        .background(Color(.systemBackground))
    }
    
    // MARK: - 样式选择区域
    private var styleSelectionSection: some View {
        ScrollView {
            VStack(spacing: 24) {
                // 前景色选择
                colorSelectionSection(
                    title: "前景色",
                    colors: QRCodeColor.foregroundColors,
                    selectedColor: $selectedForegroundColor
                )
                
                // 背景色选择
                colorSelectionSection(
                    title: "背景色",
                    colors: QRCodeColor.backgroundColors,
                    selectedColor: $selectedBackgroundColor
                )
                
                // 点类型选择
                dotTypeSelectionSection
                
                // 眼睛类型选择
                eyeTypeSelectionSection
                
                // Logo选择
                logoSelectionSection
            }
            .padding()
        }
        .background(Color(.systemGroupedBackground))
    }
    
    // MARK: - 颜色选择区域
    private func colorSelectionSection(
        title: String,
        colors: [QRCodeColor],
        selectedColor: Binding<QRCodeColor>
    ) -> some View {
        VStack(alignment: .leading, spacing: 12) {
            Text(title)
                .font(.headline)
                .foregroundColor(.primary)
            
            LazyVGrid(columns: Array(repeating: GridItem(.flexible()), count: 6), spacing: 12) {
                ForEach(colors, id: \.self) { color in
                    Button(action: {
                        selectedColor.wrappedValue = color
                    }) {
                        RoundedRectangle(cornerRadius: 8)
                            .fill(color.color)
                            .frame(height: 40)
                            .overlay(
                                RoundedRectangle(cornerRadius: 8)
                                    .stroke(selectedColor.wrappedValue == color ? Color.blue : Color.clear, lineWidth: 3)
                            )
                    }
                }
            }
        }
    }
    
    // MARK: - 点类型选择区域
    private var dotTypeSelectionSection: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("点类型")
                .font(.headline)
                .foregroundColor(.primary)
            
            ScrollView(.horizontal, showsIndicators: false) {
                HStack(spacing: 12) {
                    ForEach(QRCodeDotType.allCases, id: \.self) { dotType in
                        Button(action: {
                            selectedDotType = dotType
                        }) {
                            VStack(spacing: 8) {
                                if let image = loadImage(named: dotType.thumbnailName) {
                                    Image(uiImage: image)
                                        .resizable()
                                        .aspectRatio(contentMode: .fit)
                                        .frame(width: 40, height: 40)
                                        .background(Color.white)
                                        .cornerRadius(8)
                                } else {
                                    RoundedRectangle(cornerRadius: 8)
                                        .fill(Color.gray.opacity(0.3))
                                        .frame(width: 40, height: 40)
                                        .overlay(
                                            Text("?")
                                                .font(.caption)
                                                .foregroundColor(.secondary)
                                        )
                                }
                                
                                Text(dotType.displayName)
                                    .font(.caption)
                                    .foregroundColor(.primary)
                            }
                            .padding(8)
                            .background(
                                RoundedRectangle(cornerRadius: 12)
                                    .fill(selectedDotType == dotType ? Color.blue.opacity(0.1) : Color.clear)
                                    .overlay(
                                        RoundedRectangle(cornerRadius: 12)
                                            .stroke(selectedDotType == dotType ? Color.blue : Color.clear, lineWidth: 2)
                                    )
                            )
                        }
                    }
                }
                .padding(.horizontal)
            }
        }
    }
    
    // MARK: - 眼睛类型选择区域
    private var eyeTypeSelectionSection: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("眼睛类型")
                .font(.headline)
                .foregroundColor(.primary)
            
            ScrollView(.horizontal, showsIndicators: false) {
                HStack(spacing: 12) {
                    ForEach(QRCodeEyeType.allCases, id: \.self) { eyeType in
                        Button(action: {
                            selectedEyeType = eyeType
                        }) {
                            VStack(spacing: 8) {
                                if let image = loadImage(named: eyeType.thumbnailName) {
                                    Image(uiImage: image)
                                        .resizable()
                                        .aspectRatio(contentMode: .fit)
                                        .frame(width: 40, height: 40)
                                        .background(Color.white)
                                        .cornerRadius(8)
                                } else {
                                    RoundedRectangle(cornerRadius: 8)
                                        .fill(Color.gray.opacity(0.3))
                                        .frame(width: 40, height: 40)
                                        .overlay(
                                            Text("?")
                                                .font(.caption)
                                                .foregroundColor(.secondary)
                                        )
                                }
                                
                                Text(eyeType.displayName)
                                    .font(.caption)
                                    .foregroundColor(.primary)
                            }
                            .padding(8)
                            .background(
                                RoundedRectangle(cornerRadius: 12)
                                    .fill(selectedEyeType == eyeType ? Color.blue.opacity(0.1) : Color.clear)
                                    .overlay(
                                        RoundedRectangle(cornerRadius: 12)
                                            .stroke(selectedEyeType == eyeType ? Color.blue : Color.clear, lineWidth: 2)
                                    )
                            )
                        }
                    }
                }
                .padding(.horizontal)
            }
        }
    }
    
    // MARK: - Logo选择区域
    private var logoSelectionSection: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("Logo")
                .font(.headline)
                .foregroundColor(.primary)
            
            ScrollView(.horizontal, showsIndicators: false) {
                HStack(spacing: 12) {
                    // 无Logo选项
                    Button(action: {
                        selectedLogo = nil
                    }) {
                        VStack(spacing: 8) {
                            RoundedRectangle(cornerRadius: 8)
                                .fill(Color.gray.opacity(0.3))
                                .frame(width: 40, height: 40)
                                .overlay(
                                    Text("无")
                                        .font(.caption)
                                        .foregroundColor(.secondary)
                                )
                            
                            Text("无Logo")
                                .font(.caption)
                                .foregroundColor(.primary)
                        }
                        .padding(8)
                        .background(
                            RoundedRectangle(cornerRadius: 12)
                                .fill(selectedLogo == nil ? Color.blue.opacity(0.1) : Color.clear)
                                .overlay(
                                    RoundedRectangle(cornerRadius: 12)
                                        .stroke(selectedLogo == nil ? Color.blue : Color.clear, lineWidth: 2)
                                )
                        )
                    }
                    
                    // Logo选项
                    ForEach(QRCodeLogo.allCases, id: \.self) { logo in
                        Button(action: {
                            selectedLogo = logo
                        }) {
                            VStack(spacing: 8) {
                                if let image = loadImage(named: logo.thumbnailName) {
                                    Image(uiImage: image)
                                        .resizable()
                                        .aspectRatio(contentMode: .fit)
                                        .frame(width: 40, height: 40)
                                        .background(Color.white)
                                        .cornerRadius(8)
                                } else {
                                    RoundedRectangle(cornerRadius: 8)
                                        .fill(Color.gray.opacity(0.3))
                                        .frame(width: 40, height: 40)
                                        .overlay(
                                            Text("?")
                                                .font(.caption)
                                                .foregroundColor(.secondary)
                                        )
                                }
                                
                                Text(logo.displayName)
                                    .font(.caption)
                                    .foregroundColor(.primary)
                            }
                            .padding(8)
                            .background(
                                RoundedRectangle(cornerRadius: 12)
                                    .fill(selectedLogo == logo ? Color.blue.opacity(0.1) : Color.clear)
                                    .overlay(
                                        RoundedRectangle(cornerRadius: 12)
                                            .stroke(selectedLogo == logo ? Color.blue : Color.clear, lineWidth: 2)
                                    )
                            )
                        }
                    }
                }
                .padding(.horizontal)
            }
        }
    }
    
    // MARK: - 保存二维码
    private func saveQRCode() {
        guard let qrCodeImage = qrCodeImage else { return }
        
        // 保存到相册
        UIImageWriteToSavedPhotosAlbum(qrCodeImage, nil, nil, nil)
        
        // 保存到历史记录
        saveToHistory()
        
        dismiss()
    }
    
    // MARK: - 保存到历史记录
    private func saveToHistory() {
        let context = coreDataManager.container.viewContext
        let historyItem = HistoryItem(context: context)
        historyItem.id = UUID()
        historyItem.dataType = DataType.qrcode.rawValue
        historyItem.dataSource = DataSource.created.rawValue
        historyItem.createdAt = Date()
        historyItem.isFavorite = false
        historyItem.qrCodeType = "custom"
        historyItem.content = qrCodeContent
        
        do {
            try context.save()
        } catch {
            print("保存到历史记录失败：\(error.localizedDescription)")
        }
    }
    
    // MARK: - 辅助函数
    private func loadImage(named name: String) -> UIImage? {
        // 方法1: 尝试从Bundle中直接加载
        if let image = UIImage(named: name) {
            return image
        }
        
        // 方法2: 尝试从Resources子目录加载
        let subdirectories = ["dots", "eyes", "logos"]
        for subdirectory in subdirectories {
            if let path = Bundle.main.path(forResource: name, ofType: "png", inDirectory: "Resources/\(subdirectory)") {
                return UIImage(contentsOfFile: path)
            }
        }
        
        // 方法3: 尝试从Bundle的Resources目录加载
        if let bundlePath = Bundle.main.path(forResource: "Resources", ofType: nil) {
            for subdirectory in subdirectories {
                if let imagePath = Bundle.main.path(forResource: name, ofType: "png", inDirectory: subdirectory) {
                    return UIImage(contentsOfFile: imagePath)
                }
            }
        }
        
        // 方法4: 尝试从Assets.xcassets加载
        if let image = UIImage(named: name, in: Bundle.main, with: nil) {
            return image
        }
        
        // 方法5: 尝试从Bundle根目录加载
        if let path = Bundle.main.path(forResource: name, ofType: "png") {
            return UIImage(contentsOfFile: path)
        }
        
        return nil
    }
}

// MARK: - 预览
#Preview {
    QRCodeStyleView(qrCodeContent: "https://www.example.com")
}