package middleware

import (
	"bytes"
	"encoding/json"
	"fmt"
	"log/slog"
	"strings"
	"time"

	"kra/internal/server/httpx"
	"kra/internal/service"

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

func EmailErrorAlert(service *service.EmailService, logger *slog.Logger) gin.HandlerFunc {
	return func(c *gin.Context) {
		if strings.Contains(c.Request.URL.Path, "/email/") {
			c.Next()
			return
		}
		writer := &captureWriter{ResponseWriter: c.Writer}
		c.Writer = writer
		started := time.Now()
		c.Next()
		failed := c.Writer.Status() >= 400
		if !failed {
			var result struct {
				Code int `json:"code"`
			}
			failed = json.Unmarshal(writer.body.Bytes(), &result) == nil && result.Code != httpx.CodeSuccess
		}
		if !failed {
			return
		}
		username := "Unknown"
		if claims := Claims(c); claims != nil && claims.Username != "" {
			username = claims.Username
		}
		subject := fmt.Sprintf("%s %s 调用 %s 报错", username, c.ClientIP(), c.Request.URL.Path)
		body := bytes.NewBuffer(nil)
		fmt.Fprintf(body, "请求方式：%s<br>请求路径：%s<br>状态码：%d<br>耗时：%s<br>错误响应：<pre>%s</pre>", c.Request.Method, c.Request.URL.Path, c.Writer.Status(), time.Since(started), redactJSON(writer.body.Bytes()))
		if err := service.Alert(c.Request.Context(), subject, body.String()); err != nil && logger != nil {
			logger.Error("send HTTP error email", "error", err)
		}
	}
}