package middleware

import (
	"net"
	"net/http"
	"net/http/httputil"
	"os"
	"runtime/debug"
	"strings"

	"kra/pkg/response"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// 全局日志实例
var recoveryLogger *zap.Logger

// SetRecoveryLogger 设置Recovery日志
func SetRecoveryLogger(logger *zap.Logger) {
	recoveryLogger = logger
}

// GinRecovery 自定义Recovery中间件（与 kra 保持一致）
func GinRecovery(stack bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				// 检查是否为断开的连接
				var brokenPipe bool
				if ne, ok := err.(*net.OpError); ok {
					if se, ok := ne.Err.(*os.SyscallError); ok {
						if strings.Contains(strings.ToLower(se.Error()), "broken pipe") ||
							strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
							brokenPipe = true
						}
					}
				}

				httpRequest, _ := httputil.DumpRequest(c.Request, false)
				if brokenPipe {
					if recoveryLogger != nil {
						recoveryLogger.Error(c.Request.URL.Path,
							zap.Any("error", err),
							zap.String("request", string(httpRequest)),
						)
					}
					// 如果连接已断开，无法写入状态
					c.Error(err.(error))
					c.Abort()
					return
				}

				if stack {
					if recoveryLogger != nil {
						recoveryLogger.Error("[Recovery from panic]",
							zap.Any("error", err),
							zap.String("request", string(httpRequest)),
							zap.String("stack", string(debug.Stack())),
						)
					}
				} else {
					if recoveryLogger != nil {
						recoveryLogger.Error("[Recovery from panic]",
							zap.Any("error", err),
							zap.String("request", string(httpRequest)),
						)
					}
				}

				response.FailWithMessage("服务器内部错误", c)
				c.Abort()
			}
		}()
		c.Next()
	}
}

// Cors 跨域中间件
func Cors() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method
		origin := c.Request.Header.Get("Origin")

		c.Header("Access-Control-Allow-Origin", origin)
		c.Header("Access-Control-Allow-Headers", "Content-Type,AccessToken,X-CSRF-Token,Authorization,Token,X-Token,X-User-Id")
		c.Header("Access-Control-Allow-Methods", "POST,GET,OPTIONS,DELETE,PUT")
		c.Header("Access-Control-Expose-Headers", "Content-Length,Access-Control-Allow-Origin,Access-Control-Allow-Headers,Content-Type,New-Token,New-Expires-At")
		c.Header("Access-Control-Allow-Credentials", "true")

		// 放行所有OPTIONS方法
		if method == "OPTIONS" {
			c.AbortWithStatus(http.StatusNoContent)
		}
		c.Next()
	}
}