import SwiftUI
import PhotosUI

/// 上传管理器，处理图片上传
/// 图片上传管理器
class ImageUploader: ObservableObject {
    private let baseURL = "https://api.memorywake.com/api/v1/file/generate-upload-url"
    
    func uploadImage(_ image: UIImage, completion: @escaping (Result<String, Error>) -> Void) {
        print("🔄 开始准备上传图片...")
        // 1. 将图片转换为Data
        guard let imageData = image.jpegData(compressionQuality: 0.7) else {
            let error = NSError(domain: "ImageError", code: -1, userInfo: [NSLocalizedDescriptionKey: "图片数据转换失败"])
            print("❌ 错误：\(error.localizedDescription)")
            completion(.failure(error))
            return
        }
        
        // 2. 检查URL是否有效
        guard let url = URL(string: baseURL) else {
            let error = NSError(domain: "URLError", code: -1, userInfo: [NSLocalizedDescriptionKey: "无效的URL"])
            print("❌ 错误：\(error.localizedDescription)")
            completion(.failure(error))
            return
        }
        
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.setValue("application/json", forHTTPHeaderField: "Accept")
        request.setValue("Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJFZERTQSJ9.eyJqdGkiOjczNjM0ODY2MTE1MDc2NDY0NjQsImlkZW50aXR5IjoiNzM1MDQzOTY2MzExNjYxOTg4OCIsImV4cCI6MTc1NjE5NjgxNX0.hRC_So6LHuR6Gx-bDyO8aliVOd-Xumul8M7cydi2pTxHPweBx4421AfZ5BjGoEEwRZPIXJ5z7a1aDB7qvjpLCA", forHTTPHeaderField: "Authorization")
        
        // 3. 准备请求参数
        let fileName = "avatar_\(UUID().uuidString).jpg"
        let parameters: [String: Any] = [
            "filename": fileName,
            "content_type": "image/jpeg",
            "file_size": imageData.count
        ]
        
        do {
            request.httpBody = try JSONSerialization.data(withJSONObject: parameters)
            print("📤 准备上传请求，文件名: \(fileName), 大小: \(Double(imageData.count) / 1024.0) KB")
            print("📡 请求参数: \(parameters)")
        } catch {
            print("❌ 序列化请求参数失败: \(error.localizedDescription)")
            completion(.failure(error))
            return
        }
        
        // 4. 打印调试信息
        print("🌐 请求URL: \(url.absoluteString)")
        print("📋 请求头: \(request.allHTTPHeaderFields ?? [:])")
        
        // 5. 发起获取上传URL的请求
        print("🌐 正在获取上传链接...")
        let task = URLSession.shared.dataTask(with: request) { [weak self] data, response, error in
            // 切换到主线程处理响应
            DispatchQueue.main.async {
                if let error = error {
                    print("❌ 请求失败: \(error.localizedDescription)")
                    completion(.failure(error))
                    return
                }
                
                guard let httpResponse = response as? HTTPURLResponse else {
                    let error = NSError(domain: "NetworkError", code: -1, userInfo: [NSLocalizedDescriptionKey: "无效的服务器响应"])
                    print("❌ 错误：\(error.localizedDescription)")
                    completion(.failure(error))
                    return
                }
                
                print("📊 响应状态码: \(httpResponse.statusCode)")
                print("📦 响应头: \(httpResponse.allHeaderFields)")
                
                guard let data = data else {
                    let error = NSError(domain: "NetworkError", code: -1, userInfo: [NSLocalizedDescriptionKey: "没有接收到数据"])
                    print("❌ 错误：\(error.localizedDescription)")
                    completion(.failure(error))
                    return
                }
                
                // 打印原始响应数据
                if let responseString = String(data: data, encoding: .utf8) {
                    print("📡 原始响应数据: \(responseString)")
                }
                
                // 5. 解析获取上传URL的响应
                do {
                    guard let json = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
                        throw NSError(domain: "ParseError", code: -1, userInfo: [NSLocalizedDescriptionKey: "响应数据格式错误"])
                    }
                    
                    print("📋 解析后的JSON: \(json)")
                    
                    // 根据实际API响应结构调整这里的键名
                    if let uploadUrlString = json["url"] as? String,
                       let uploadUrl = URL(string: uploadUrlString) {
                        print("✅ 成功获取上传链接: \(uploadUrlString)")
                        self?.uploadImageData(imageData, to: uploadUrl, fileName: fileName, completion: completion)
                    } else {
                        throw NSError(domain: "APIError", code: -1, userInfo: [NSLocalizedDescriptionKey: "无法获取上传链接: \(json)"])
                    }
                } catch {
                    print("❌ 解析响应数据失败: \(error.localizedDescription)")
                    completion(.failure(error))
                }
            }
        }
        
        task.resume()
    }
    
    private func uploadImageData(_ data: Data, to url: URL, fileName: String, completion: @escaping (Result<String, Error>) -> Void) {
        var request = URLRequest(url: url)
        request.httpMethod = "PUT"
        request.setValue("image/jpeg", forHTTPHeaderField: "Content-Type")
        request.httpBody = data
        
        print("🚀 开始上传图片数据...")
        
        let task = URLSession.shared.dataTask(with: request) { _, response, error in
            DispatchQueue.main.async {
                if let error = error {
                    print("❌ 上传失败: \(error.localizedDescription)")
                    completion(.failure(error))
                    return
                }
                
                // 处理上传响应
                if let httpResponse = response as? HTTPURLResponse {
                    print("📊 上传响应状态码: \(httpResponse.statusCode)")
                    
                    if (200...299).contains(httpResponse.statusCode) {
                        let fileUrl = "https://your-cdn-domain.com/\(fileName)" // 替换为实际的CDN域名
                        print("✅ 上传成功！文件URL: \(fileUrl)")
                        completion(.success(fileUrl))
                    } else {
                        let errorMessage = "上传失败，状态码: \(httpResponse.statusCode)"
                        print("❌ \(errorMessage)")
                        let error = NSError(domain: "UploadError", 
                                        code: httpResponse.statusCode,
                                        userInfo: [NSLocalizedDescriptionKey: errorMessage])
                        completion(.failure(error))
                    }
                } else {
                    let errorMessage = "无效的服务器响应"
                    print("❌ \(errorMessage)")
                    let error = NSError(domain: "UploadError", 
                                      code: -1,
                                      userInfo: [NSLocalizedDescriptionKey: errorMessage])
                    completion(.failure(error))
                }
            }
        }
        
        task.resume()
    }
}

/// 照片选择器，封装了系统相册选择功能
struct PhotoPicker: UIViewControllerRepresentable {
    // MARK: - 属性
    
    /// 绑定的已选图片数组
    @Binding var selectedImages: [UIImage]
    
    /// 最多可选图片数量
    let selectionLimit: Int
    
    /// 图片过滤器，默认为图片类型
    let filter: PHPickerFilter
    
    /// 图片上传管理器
    private let uploader = ImageUploader()
    
    // MARK: - 初始化方法
    
    /// 初始化照片选择器
    init(selectedImages: Binding<[UIImage]>, selectionLimit: Int = 1, filter: PHPickerFilter = .images) {
        self._selectedImages = selectedImages
        self.selectionLimit = selectionLimit
        self.filter = filter
    }
    
    // MARK: - UIViewControllerRepresentable 协议方法
    
    func makeUIViewController(context: Context) -> PHPickerViewController {
        var configuration = PHPickerConfiguration(photoLibrary: PHPhotoLibrary.shared())
        configuration.filter = filter
        configuration.selectionLimit = selectionLimit
        configuration.preferredAssetRepresentationMode = .current
        
        let picker = PHPickerViewController(configuration: configuration)
        picker.delegate = context.coordinator
        return picker
    }
    
    func updateUIViewController(_ uiViewController: PHPickerViewController, context: Context) {}
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    // MARK: - 协调器类
    
    class Coordinator: NSObject, PHPickerViewControllerDelegate {
        let parent: PhotoPicker
        
        init(_ parent: PhotoPicker) {
            self.parent = parent
        }
        
        func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
            parent.selectedImages.removeAll()
            
            let group = DispatchGroup()
            var loadedImages: [Int: UIImage] = [:]
            
            for (index, result) in results.enumerated() {
                group.enter()
                
                if result.itemProvider.canLoadObject(ofClass: UIImage.self) {
                    result.itemProvider.loadObject(ofClass: UIImage.self) { (image, error) in
                        if let image = image as? UIImage {
                            // 保存加载的图片，保持原始顺序
                            loadedImages[index] = image
                            
                            // 上传图片
                            self.parent.uploader.uploadImage(image) { result in
                                // 这里可以添加上传完成后的处理
                                // 目前按需求暂时不处理
                            }
                        }
                        group.leave()
                    }
                } else {
                    group.leave()
                }
            }
            
            group.notify(queue: .main) {
                let sortedImages = loadedImages.sorted { $0.key < $1.key }.map { $0.value }
                self.parent.selectedImages.append(contentsOf: sortedImages)
                picker.dismiss(animated: true)
            }
        }
    }
}

// MARK: - 头像上传组件

/// 头像上传视图，提供头像选择功能
struct AvatarUploader: View {
    // MARK: - 属性
    
    /// 当前选中的头像图片
    @Binding var selectedImage: UIImage?
    
    /// 头像尺寸
    let size: CGFloat
    
    // MARK: - 状态
    
    /// 是否显示图片选择器
    @State private var isImagePickerPresented = false
    
    // MARK: - 视图
    
    var body: some View {
        Button(action: {
            isImagePickerPresented = true
        }) {
            ZStack {
                if let selectedImage = selectedImage {
                    Image(uiImage: selectedImage)
                        .resizable()
                        .scaledToFill()
                        .frame(width: size, height: size)
                        .clipShape(RoundedRectangle(cornerRadius: size * 0.1))
                } else {
                    Color.gray.opacity(0.1)
                        .frame(width: size, height: size)
                        .overlay(
                            SVGImage(svgName: "Avatar")
                                .frame(width: size * 0.8, height: size * 0.8)
                        )
                        .clipShape(RoundedRectangle(cornerRadius: size * 0.1))
                        .overlay(
                            RoundedRectangle(cornerRadius: size * 0.1)
                                .stroke(Color.gray.opacity(0.3), lineWidth: 1)
                        )
                }
            }
            .frame(width: size, height: size)
            .contentShape(Rectangle())
        }
        .buttonStyle(PlainButtonStyle())
        .sheet(isPresented: $isImagePickerPresented) {
            PhotoPicker(
                selectedImages: Binding(
                    get: { [selectedImage].compactMap { $0 } },
                    set: { images in
                        selectedImage = images.first
                    }
                ),
                selectionLimit: 1
            )
        }
    }
}