package middleware

import (
	"context"
	"net/http"
	"strings"

	"github.com/youruser/base/internal/util/jwt"
)

type AuthMiddleware struct{}

func NewAuthMiddleware() *AuthMiddleware {
	return &AuthMiddleware{}
}

func (m *AuthMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// 从 Header 中获取 Token
		authHeader := r.Header.Get("Authorization")
		if authHeader == "" {
			http.Error(w, "Unauthorized", http.StatusUnauthorized)
			return
		}

		// Token 格式: "Bearer <token>"
		tokenString := strings.TrimPrefix(authHeader, "Bearer ")
		if tokenString == "" {
			http.Error(w, "Invalid token format", http.StatusUnauthorized)
			return
		}

		// 解析并验证 Token
		claims, err := jwt.ParseToken(tokenString)
		if err != nil {
			http.Error(w, "Invalid token: "+err.Error(), http.StatusUnauthorized)
			return
		}

		// 将 userId 存入上下文，供后续 logic 使用
		ctx := context.WithValue(r.Context(), "userId", claims.UserID)
		ctx = context.WithValue(ctx, "username", claims.Username)
		ctx = context.WithValue(ctx, "role", claims.Role)

		// 传递给下一个处理器
		next(w, r.WithContext(ctx))
	}
}