package middleware

import (
	"context"
	"net/http"

	"xingfucha-server/app/main/api/internal/config"
	"xingfucha-server/app/main/model"
	jwtx "xingfucha-server/common/jwt"
	"xingfucha-server/common/xerr"

	"github.com/pkg/errors"
	"github.com/zeromicro/go-zero/rest/httpx"
)

const (
	// 定义错误码
	ErrCodeUnauthorized = 401
)

type AuthInterceptorMiddleware struct {
	Config    config.Config
	UserModel model.UserModel
}

func NewAuthInterceptorMiddleware(c config.Config, userModel model.UserModel) *AuthInterceptorMiddleware {
	return &AuthInterceptorMiddleware{
		Config:    c,
		UserModel: userModel,
	}
}

func (m *AuthInterceptorMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// 从请求头中获取Authorization字段
		authHeader := r.Header.Get("Authorization")

		// 如果没有Authorization头，直接放行
		if authHeader == "" {
			next(w, r)
			return
		}

		// 解析JWT令牌
		claims, err := jwtx.ParseJwtToken(authHeader, m.Config.JwtAuth.AccessSecret)
		if err != nil {
			// JWT解析失败，返回401错误
			httpx.Error(w, errors.Wrapf(xerr.NewErrCode(ErrCodeUnauthorized), "token解析失败: %v", err))
			return
		}

		// 携带token的请求：校验用户是否被封禁（保证封禁即时生效）
		if m.UserModel != nil && claims.UserId > 0 {
			user, err := m.UserModel.FindOne(r.Context(), claims.UserId)
			if err == nil && user.Disable == model.UserDisableBanned {
				httpx.Error(w, xerr.NewErrCode(xerr.USER_DISABLED))
				return
			}
		}

		ctx := context.WithValue(r.Context(), jwtx.ExtraKey, claims)

		// 使用新的上下文继续处理请求
		next(w, r.WithContext(ctx))
	}
}