package middleware

import (
	"fmt"
	"strings"

	"github.com/gin-gonic/gin"

	"carrot_bbs/internal/pkg/response"
	"carrot_bbs/internal/service"
)

// Auth 认证中间件
func Auth(jwtService *service.JWTService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		fmt.Printf("[DEBUG] Auth middleware: Authorization header = %q\n", authHeader)

		if authHeader == "" {
			fmt.Printf("[DEBUG] Auth middleware: no Authorization header, returning 401\n")
			response.Unauthorized(c, "authorization header is required")
			c.Abort()
			return
		}

		// 提取Token
		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || parts[0] != "Bearer" {
			fmt.Printf("[DEBUG] Auth middleware: invalid Authorization header format\n")
			response.Unauthorized(c, "invalid authorization header format")
			c.Abort()
			return
		}

		token := parts[1]
		fmt.Printf("[DEBUG] Auth middleware: token = %q\n", token[:min(20, len(token))]+"...")

		// 验证Token
		claims, err := jwtService.ParseToken(token)
		if err != nil {
			fmt.Printf("[DEBUG] Auth middleware: failed to parse token: %v\n", err)
			response.Unauthorized(c, "invalid token")
			c.Abort()
			return
		}

		fmt.Printf("[DEBUG] Auth middleware: parsed claims, user_id = %q, username = %q\n", claims.UserID, claims.Username)

		// 将用户信息存入上下文
		c.Set("user_id", claims.UserID)
		c.Set("username", claims.Username)

		c.Next()
	}
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// OptionalAuth 可选认证中间件
func OptionalAuth(jwtService *service.JWTService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.Next()
			return
		}

		// 提取Token
		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || parts[0] != "Bearer" {
			c.Next()
			return
		}

		token := parts[1]

		// 验证Token
		claims, err := jwtService.ParseToken(token)
		if err != nil {
			c.Next()
			return
		}

		// 将用户信息存入上下文
		c.Set("user_id", claims.UserID)
		c.Set("username", claims.Username)

		c.Next()
	}
}