package nuoer

import (
	"errors"
	"fmt"
)

// 平台层 code 返回码（见文档2）
const (
	CodeSuccess       = 0  // 成功
	CodeResponseError = -1 // 响应异常
)

// 业务层 busiCode 返回码（见文档2）
const (
	BusiCodeSuccess          = 10   // 查询成功【计费】
	BusiCodeNotFound         = 1000 // 数据未查得
	BusiCodeInsufficientFund = 1001 // 账户余额不足
	BusiCodeAccountNotFound  = 1002 // 账户信息不存在
	BusiCodeAppIDError       = 1003 // appId异常
	BusiCodeProductError     = 1004 // 产品编号异常
	BusiCodeAccountError     = 1005 // 账号信息异常
	BusiCodeOverdraftLimit   = 1006 // 透支余额已达上限
	BusiCodeDataRequestError = 1007 // 数据请求异常
	BusiCodeServiceNotOpen   = 1009 // 服务尚未开通
)

var (
	ErrDatasource = errors.New("数据源异常")
	ErrSystem     = errors.New("系统异常")
	ErrNotFound   = errors.New("查询为空")
)

// platformCodeDesc 平台层 code -> 描述
var platformCodeDesc = map[int]string{
	CodeSuccess:       "成功",
	CodeResponseError: "响应异常",
}

// busiCodeDesc 业务层 busiCode -> 描述
var busiCodeDesc = map[int]string{
	BusiCodeSuccess:          "查询成功【计费】",
	BusiCodeNotFound:         "数据未查得",
	BusiCodeInsufficientFund: "账户余额不足",
	BusiCodeAccountNotFound:  "账户信息不存在",
	BusiCodeAppIDError:       "appId异常",
	BusiCodeProductError:     "产品编号异常",
	BusiCodeAccountError:     "账号信息异常",
	BusiCodeOverdraftLimit:   "透支余额已达上限",
	BusiCodeDataRequestError: "数据请求异常",
	BusiCodeServiceNotOpen:   "服务尚未开通",
}

// GetPlatformCodeDesc 根据平台 code 获取描述
func GetPlatformCodeDesc(code int) string {
	if desc, ok := platformCodeDesc[code]; ok {
		return desc
	}
	return ""
}

// GetBusiCodeDesc 根据 busiCode 获取描述
func GetBusiCodeDesc(busiCode int) string {
	if desc, ok := busiCodeDesc[busiCode]; ok {
		return desc
	}
	return ""
}

// nuoerError 诺尔智汇平台层错误（响应 code 字段）
type nuoerError struct {
	Code    int
	Message string
}

func (e *nuoerError) Error() string {
	return fmt.Sprintf("诺尔智汇返回错误，code: %d，msg: %s", e.Code, e.Message)
}

// NewNuoerError 创建平台层错误
func NewNuoerError(code int, message string) *nuoerError {
	if message == "" {
		if desc := GetPlatformCodeDesc(code); desc != "" {
			message = desc
		} else {
			message = "诺尔智汇返回未知错误"
		}
	}
	return &nuoerError{Code: code, Message: message}
}

// nuoerBusiError 诺尔智汇业务层错误（data.busiCode 字段）
type nuoerBusiError struct {
	BusiCode int
	BusiMsg  string
}

func (e *nuoerBusiError) Error() string {
	return fmt.Sprintf("诺尔智汇业务错误，busiCode: %d，busiMsg: %s", e.BusiCode, e.BusiMsg)
}

// NewNuoerBusiError 创建业务层错误
func NewNuoerBusiError(busiCode int, busiMsg string) *nuoerBusiError {
	if busiMsg == "" {
		if desc := GetBusiCodeDesc(busiCode); desc != "" {
			busiMsg = desc
		} else {
			busiMsg = "诺尔智汇业务返回未知错误"
		}
	}
	return &nuoerBusiError{BusiCode: busiCode, BusiMsg: busiMsg}
}

// GetNotFoundErrByBusiCode 将 busiCode 映射为「查询为空」类错误（不扣费场景）
func GetNotFoundErrByBusiCode(busiCode int) error {
	switch busiCode {
	case BusiCodeNotFound:
		return ErrNotFound
	default:
		return nil
	}
}

// GetErrByBusiCode 将 busiCode 映射为内部哨兵错误，供处理器 errors.Is 判断
func GetErrByBusiCode(busiCode int) error {
	if busiCode == BusiCodeSuccess {
		return nil
	}
	if notFound := GetNotFoundErrByBusiCode(busiCode); notFound != nil {
		return notFound
	}
	return ErrDatasource
}

// GetErrByPlatformCode 将平台 code 映射为内部哨兵错误
func GetErrByPlatformCode(code int) error {
	if code == CodeSuccess {
		return nil
	}
	return ErrDatasource
}