package middleware

import (
	"log/slog"
	"net/http"
	"runtime/debug"

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

// Recovery 捕获 handler 中的 panic，记录结构化日志并以 500 响应，
// 符合规范：recover 仅允许用于框架中间件。
func Recovery() gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if r := recover(); r != nil {
				slog.Error("panic recovered",
					slog.String("path", c.Request.URL.Path),
					slog.Any("err", r),
					slog.String("stack", string(debug.Stack())),
				)
				c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{
					"code": 50000,
					"msg":  "internal server error",
					"data": nil,
				})
			}
		}()
		c.Next()
	}
}