package middleware

import (
	"fmt"
	"net/http"

	"perms-system-server/internal/response"

	"github.com/zeromicro/go-zero/core/limit"
	"github.com/zeromicro/go-zero/core/stores/redis"
	"github.com/zeromicro/go-zero/rest/httpx"
)

type RateLimitMiddleware struct {
	limiter *limit.PeriodLimit
}

func NewRateLimitMiddleware(rds *redis.Redis, period int, quota int, keyPrefix string) *RateLimitMiddleware {
	limiter := limit.NewPeriodLimit(period, quota, rds, keyPrefix)
	return &RateLimitMiddleware{limiter: limiter}
}

func (m *RateLimitMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		ip := r.Header.Get("X-Forwarded-For")
		if ip == "" {
			ip = r.Header.Get("X-Real-IP")
		}
		if ip == "" {
			ip = r.RemoteAddr
		}

		key := fmt.Sprintf("ip:%s", ip)
		code, _ := m.limiter.Take(key)
		if code == limit.OverQuota {
			httpx.ErrorCtx(r.Context(), w, response.ErrTooManyRequests("请求过于频繁，请稍后再试"))
			return
		}
		next(w, r)
	}
}