package api

import (
	"net/http"
	"strings"

	"d:\项目\dobaochet\backend\config"
	"d:\项目\dobaochet\backend\db"
	"d:\项目\dobaochet\backend\models"
	"d:\项目\dobaochet\backend\utils"

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

// AuthMiddleware 认证中间件
func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		// 从请求头获取Authorization
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "未提供认证令牌"})
			c.Abort()
			return
		}

		// 检查Bearer前缀
		parts := strings.SplitN(authHeader, " ", 2)
		if !(len(parts) == 2 && parts[0] == "Bearer") {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "认证令牌格式错误"})
			c.Abort()
			return
		}

		// 解析JWT令牌
		claims, err := utils.ParseToken(parts[1], cfg.JWT.SecretKey)
		if err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "无效的认证令牌"})
			c.Abort()
			return
		}

		// 查询用户信息
		var user models.User
		result := db.GetDB().Preload("Quota").First(&user, claims.UserID)
		if result.Error != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "用户不存在"})
			c.Abort()
			return
		}

		// 检查用户是否激活
		if !user.IsActive {
			c.JSON(http.StatusForbidden, gin.H{"error": "用户已被禁用"})
			c.Abort()
			return
		}

		// 将用户信息设置到上下文
		c.Set("user", user)
		c.Set("user_id", user.ID)
		c.Set("is_admin", user.IsAdmin)

		c.Next()
	}
}

// AdminMiddleware 管理员中间件
func AdminMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		// 从上下文获取用户信息
		isAdmin, exists := c.Get("is_admin")
		if !exists || !isAdmin.(bool) {
			c.JSON(http.StatusForbidden, gin.H{"error": "需要管理员权限"})
			c.Abort()
			return
		}

		c.Next()
	}
}

// CORSMiddleware CORS中间件
func CORSMiddleware(cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		// 设置允许的来源
		c.Writer.Header().Set("Access-Control-Allow-Origin", strings.Join(cfg.CORS.AllowOrigins, ","))
		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
		c.Writer.Header().Set("Access-Control-Allow-Headers", strings.Join(cfg.CORS.AllowHeaders, ","))
		c.Writer.Header().Set("Access-Control-Allow-Methods", strings.Join(cfg.CORS.AllowMethods, ","))

		if c.Request.Method == "OPTIONS" {
			c.AbortWithStatus(204)
			return
		}

		c.Next()
	}
}