package middleware

import (
	"fmt"
	"strconv"
	"strings"

	"gofaster/internal/shared/jwt"
	"gofaster/internal/shared/response"

	"github.com/gin-gonic/gin"
)

// JWTConfig JWT中间件配置
type JWTConfig struct {
	SecretKey string
	Issuer    string
}

// JWTAuth JWT认证中间件
func JWTAuth(config JWTConfig) gin.HandlerFunc {
	return func(c *gin.Context) {
		fmt.Printf("🚀 JWTAuth中间件开始执行 - 路径: %s\n", c.Request.URL.Path)
		fmt.Printf("🔑 JWT配置: SecretKey=%s, Issuer=%s\n", config.SecretKey[:10]+"...", config.Issuer)

		// 获取Authorization头部
		authHeader := c.GetHeader("Authorization")
		fmt.Printf("📋 Authorization头部: %s\n", authHeader)

		if authHeader == "" {
			fmt.Printf("❌ JWTAuth中间件 - Authorization头部缺失\n")
			response.Unauthorized(c, "未提供认证令牌", "Authorization头部缺失")
			c.Abort()
			return
		}

		// 检查Bearer前缀
		if !strings.HasPrefix(authHeader, "Bearer ") {
			fmt.Printf("❌ JWTAuth中间件 - Bearer前缀缺失\n")
			response.Unauthorized(c, "认证令牌格式错误", "令牌必须以Bearer开头")
			c.Abort()
			return
		}

		// 提取令牌
		tokenString := strings.TrimPrefix(authHeader, "Bearer ")
		if len(tokenString) > 20 {
			fmt.Printf("JWTAuth中间件 - 提取的令牌: %s...\n", tokenString[:20])
		} else {
			fmt.Printf("JWTAuth中间件 - 提取的令牌: %s\n", tokenString)
		}

		// 创建JWT管理器
		jwtManager := jwt.NewJWTManager(config.SecretKey, config.Issuer)

		// 验证令牌
		fmt.Printf("JWTAuth中间件 - 开始验证令牌\n")
		claims, err := jwtManager.ValidateToken(tokenString)
		if err != nil {
			fmt.Printf("JWTAuth中间件 - 令牌验证失败: %v\n", err)
			response.Unauthorized(c, "认证令牌无效", err.Error())
			c.Abort()
			return
		}

		fmt.Printf("✅ JWTAuth中间件 - 令牌验证成功\n")
		fmt.Printf("📊 JWTAuth中间件 - 解析的claims: %+v\n", claims)
		fmt.Printf("🔍 JWTAuth中间件 - claims类型: %T\n", claims)
		fmt.Printf("📏 JWTAuth中间件 - claims长度: %d\n", len(claims))

		// 遍历所有claims键值对
		for key, value := range claims {
			fmt.Printf("🔑 JWTAuth中间件 - claim[%s]: 类型=%T, 值=%v\n", key, value, value)
		}

		// 安全地存储用户信息到上下文中
		if userID, exists := claims["user_id"]; exists {
			fmt.Printf("✅ JWTAuth中间件 - user_id类型: %T, 值: %v\n", userID, userID)
			// 直接存储原始值，不进行类型转换
			c.Set("user_id", userID)
			fmt.Printf("💾 JWTAuth中间件 - 已存储user_id到上下文\n")
		} else {
			fmt.Printf("❌ JWTAuth中间件 - claims中未找到user_id\n")
			// 尝试其他可能的键名
			if userID, exists := claims["userID"]; exists {
				fmt.Printf("✅ JWTAuth中间件 - 找到userID: 类型=%T, 值=%v\n", userID, userID)
				c.Set("user_id", userID)
				fmt.Printf("💾 JWTAuth中间件 - 已存储userID到上下文\n")
			} else if userID, exists := claims["userId"]; exists {
				fmt.Printf("✅ JWTAuth中间件 - 找到userId: 类型=%T, 值=%v\n", userID, userID)
				c.Set("user_id", userID)
				fmt.Printf("💾 JWTAuth中间件 - 已存储userId到上下文\n")
			} else {
				fmt.Printf("❌ JWTAuth中间件 - 所有可能的用户ID键都未找到\n")
			}
		}

		if username, exists := claims["username"]; exists {
			fmt.Printf("JWTAuth中间件 - username类型: %T, 值: %v\n", username, username)
			c.Set("username", username)
		}

		if email, exists := claims["email"]; exists {
			fmt.Printf("JWTAuth中间件 - email类型: %T, 值: %v\n", email, email)
			c.Set("email", email)
		}

		fmt.Printf("JWTAuth中间件 - 准备调用c.Next()\n")
		// 继续处理请求
		c.Next()
		fmt.Printf("JWTAuth中间件 - c.Next()执行完成\n")
	}
}

// OptionalJWTAuth 可选的JWT认证中间件（不强制要求认证）
func OptionalJWTAuth(config JWTConfig) gin.HandlerFunc {
	return func(c *gin.Context) {
		// 获取Authorization头部
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			// 没有令牌，继续处理请求
			c.Next()
			return
		}

		// 检查Bearer前缀
		if !strings.HasPrefix(authHeader, "Bearer ") {
			// 令牌格式错误，继续处理请求（不强制要求）
			c.Next()
			return
		}

		// 提取令牌
		tokenString := strings.TrimPrefix(authHeader, "Bearer ")

		// 创建JWT管理器
		jwtManager := jwt.NewJWTManager(config.SecretKey, config.Issuer)

		// 验证令牌
		claims, err := jwtManager.ValidateToken(tokenString)
		if err != nil {
			// 令牌无效，继续处理请求（不强制要求）
			c.Next()
			return
		}

		// 将用户信息存储到上下文中
		if userID, exists := claims["user_id"]; exists {
			c.Set("user_id", userID)
		}
		if username, exists := claims["username"]; exists {
			c.Set("username", username)
		}
		if email, exists := claims["email"]; exists {
			c.Set("email", email)
		}

		// 继续处理请求
		c.Next()
	}
}

// GetUserID 从上下文中获取用户ID
func GetUserID(c *gin.Context) (uint, bool) {
	fmt.Printf("🔍 GetUserID函数开始执行\n")

	userID, exists := c.Get("user_id")
	if !exists {
		fmt.Printf("❌ GetUserID - user_id不存在于上下文中\n")
		return 0, false
	}

	fmt.Printf("✅ GetUserID - 从上下文获取的user_id类型: %T, 值: %v\n", userID, userID)

	// 安全地进行类型转换，避免panic
	switch v := userID.(type) {
	case uint:
		fmt.Printf("GetUserID - 类型匹配uint: %d\n", v)
		return v, true
	case int:
		if v >= 0 {
			fmt.Printf("GetUserID - 类型匹配int: %d, 转换为uint: %d\n", v, uint(v))
			return uint(v), true
		} else {
			fmt.Printf("GetUserID - 类型匹配int: %d, 但值为负数，无法转换为uint\n", v)
		}
	case int64:
		if v >= 0 {
			fmt.Printf("GetUserID - 类型匹配int64: %d, 转换为uint: %d\n", v, uint(v))
			return uint(v), true
		} else {
			fmt.Printf("GetUserID - 类型匹配int64: %d, 但值为负数，无法转换为uint\n", v)
		}
	case float64:
		if v >= 0 && v <= float64(^uint(0)) {
			fmt.Printf("GetUserID - 类型匹配float64: %f, 转换为uint: %d\n", v, uint(v))
			return uint(v), true
		} else {
			fmt.Printf("GetUserID - 类型匹配float64: %f, 但值超出uint范围，无法转换\n", v)
		}
	case string:
		if parsed, err := strconv.ParseUint(v, 10, 32); err == nil {
			fmt.Printf("GetUserID - 类型匹配string: %s, 解析为uint: %d\n", v, uint(parsed))
			return uint(parsed), true
		} else {
			fmt.Printf("GetUserID - 类型匹配string: %s, 但解析失败: %v\n", v, err)
		}
	default:
		fmt.Printf("GetUserID - 未知类型: %T, 值: %v\n", userID, userID)
	}

	// 如果所有类型转换都失败，返回0和false
	fmt.Printf("GetUserID - 所有类型转换都失败，返回0\n")
	return 0, false
}

// GetUsername 从上下文中获取用户名
func GetUsername(c *gin.Context) (string, bool) {
	username, exists := c.Get("username")
	if !exists {
		return "", false
	}
	if str, ok := username.(string); ok {
		return str, true
	}
	return "", false
}

// GetEmail 从上下文中获取邮箱
func GetEmail(c *gin.Context) (string, bool) {
	email, exists := c.Get("email")
	if !exists {
		return "", false
	}
	if str, ok := email.(string); ok {
		return str, true
	}
	return "", false
}