package web

import (
	"encoding/json"
	"errors"
	"fmt"
	"log/slog"
	"platform/web/auth"
	"platform/web/core"
	"reflect"
	"time"

	"github.com/gofiber/fiber/v2"
)

func ErrorHandler(c *fiber.Ctx, err error) error {

	var code = fiber.StatusInternalServerError
	var message = "服务器异常"

	var fiberErr *fiber.Error
	var authErr auth.AuthErr
	var bizErr *core.BizErr
	var servErr *core.ServErr
	var jsonErr *json.UnmarshalTypeError
	var timeErr *time.ParseError

	switch {

	// fiber 错误
	case errors.As(err, &fiberErr):
		code = fiberErr.Code
		message = fiberErr.Message

	// 认证授权错误
	case errors.As(err, &authErr):
		switch {
		case errors.Is(err, auth.ErrAuthenticateUnauthorize):
			code = fiber.StatusUnauthorized
		case errors.Is(err, auth.ErrAuthenticateForbidden):
			code = fiber.StatusForbidden
		default:
			code = fiber.StatusBadRequest
		}
		message = err.Error()

	// 已处理的业务错误
	case errors.As(err, &bizErr):
		code = fiber.StatusBadRequest
		message = err.Error()

	case errors.As(err, &servErr):
		code = fiber.StatusInternalServerError
		message = err.Error()

	case errors.As(err, &jsonErr):
		code = fiber.StatusBadRequest
		message = fmt.Sprintf("参数 %s 类型不正确，传入类型为 %s，正确类型应该为 %s", jsonErr.Field, jsonErr.Value, jsonErr.Type.Name())

	case errors.As(err, &timeErr):
		code = fiber.StatusBadRequest
		message = fmt.Sprintf("时间格式不正确，传入值为 %s，检查传参是否为时间类型", timeErr.Value)

	// 所有未手动声明的错误类型
	default:
		t := reflect.TypeOf(err)
		for {
			if t.Kind() == reflect.Pointer {
				t = t.Elem()
				continue
			}
			break
		}
		slog.Warn("未处理的异常", slog.String("type", t.String()), slog.String("error", err.Error()))
	}

	c.Set(fiber.HeaderContentType, fiber.MIMETextPlainCharsetUTF8)
	return c.Status(code).SendString(message)
}