package rescode

import (
	"fmt"
	"net/http"
)

// 只允许使用下面的几个http状态码
const (
	HttpCode200 = http.StatusOK
	HttpCode400 = http.StatusBadRequest
	HttpCode401 = http.StatusUnauthorized
	HttpCode403 = http.StatusForbidden
	HttpCode404 = http.StatusNotFound
	HttpCode500 = http.StatusInternalServerError
)

const (
	successCode = 000000
	unknownCode = 999999
)

var (
	successErrCode = ErrCode{
		httpCode:  HttpCode200,
		code:      successCode,
		message:   "成功",
		reference: "",
	}
	unknownErrCode = ErrCode{
		httpCode:  HttpCode500,
		code:      unknownCode,
		message:   "未知错误",
		reference: "未知错误,请联系系统开发者",
	}
)

type ErrCode struct {
	httpCode  int
	code      int
	cause     error
	message   string
	reference string
	tips      string
}

func NewErrCode(httpCode, code int, message, reference string) *ErrCode {
	return &ErrCode{
		httpCode:  httpCode,
		code:      code,
		message:   message,
		reference: reference,
	}
}

func (ec *ErrCode) HTTPStatus() int {
	return ec.httpCode
}
func (ec *ErrCode) Code() string {
	return fmt.Sprintf("%06d", ec.code)
}

func (ec *ErrCode) Reference() string {
	return ec.reference
}

func (ec *ErrCode) Message() string {
	return ec.message
}

func (ec *ErrCode) Cause() error {
	return ec.cause
}

func (ec *ErrCode) Error() string {
	var cause string
	if ec.cause != nil {
		cause = ec.cause.Error()
	}
	return fmt.Sprintf("response:%s tips:%s cause:%s", ec.message, ec.tips, cause)
}

func RegisterErrorWithCause(cause error, errCode *ErrCode) error {
	return &ErrCode{
		httpCode:  errCode.httpCode,
		code:      errCode.code,
		cause:     cause,
		tips:      "",
		message:   errCode.message,
		reference: errCode.reference,
	}
}

func RegisterErrorWithMessage(cause error, tips string, errCode *ErrCode) error {
	return &ErrCode{
		httpCode:  errCode.httpCode,
		code:      errCode.code,
		cause:     cause,
		message:   errCode.message,
		tips:      tips,
		reference: errCode.reference,
	}
}

func ParseCode(err error) *ErrCode {
	if err == nil {
		return nil
	}

	if v, ok := err.(*ErrCode); ok {
		return v
	}

	return &unknownErrCode
}