// Package middleware Gin 中间件层，提供请求日志、认证等横切能力
package middleware

import (
	"time"

	"resume-platform/pkg/logger"

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

func RequestLogger() gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		path := c.Request.URL.Path
		method := c.Request.Method

		c.Next()

		latency := time.Since(start)
		statusCode := c.Writer.Status()
		clientIP := c.ClientIP()
		referer := c.Request.Referer()
		userAgent := c.Request.UserAgent()

		entry := logger.FromContext(c.Request.Context())
		entry = entry.WithFields(map[string]interface{}{
			"status":   statusCode,
			"latency":  latency,
			"ip":       clientIP,
			"method":   method,
			"path":     path,
		})

		if referer != "" {
			entry = entry.WithField("referer", referer)
		}
		if len(c.Errors) > 0 {
			entry = entry.WithField("errors", c.Errors.String())
		}

		switch {
		case statusCode >= 500:
			entry.WithField("user_agent", userAgent).Error("Server error")
		case statusCode >= 400:
			entry.Warn("Client error")
		default:
			entry.Info("Request handled")
		}
	}
}