package response

// 统一响应结构
type Response struct {
	Code  int         `json:"code"`            // 0=成功，非0=失败
	Msg   string      `json:"msg,omitempty"`   // 提示信息
	Data  interface{} `json:"data,omitempty"`  // 具体数据
	Error string      `json:"error,omitempty"` // 错误详情
}

// 错误码定义（结合你的业务场景）
const (
	CodeOK         = 0
	CodeParamError = 1001 // 参数错误
	CodeNotFound   = 1002 // 资源未找到
	CodeDBError    = 1003 // 数据库操作失败
	// 更精细的数据库错误码（用于区分连接/查询/元数据/事务等）
	CodeDBConnError   = 1101 // 数据库连接失败
	CodeDBQueryError  = 1102 // 数据库查询/执行失败
	CodeDBMetaError   = 1103 // 数据库元数据查询失败
	CodeAuthError     = 1004 // 鉴权失败
	CodePermission    = 1005 // 权限不足
	CodeConflict      = 1006 // 资源冲突
	CodeTimeout       = 1007 // 超时
	CodeInternalError = 1099 // 服务器内部错误

	// 连接池相关
	CodeConnPoolFull     = 2001 // 连接池已满
	CodeConnPoolClosed   = 2002 // 连接池已关闭
	CodeConnNotExist     = 2003 // 连接不存在
	CodeConnAlreadyExist = 2004 // 连接已存在

	// 存储相关
	CodeGroupNotExist = 3001 // 分组不存在
	CodeGroupExist    = 3002 // 分组已存在
	CodeSaveFailed    = 3003 // 保存失败
	CodeLoadFailed    = 3004 // 加载失败
	CodeDeleteFailed  = 3005 // 删除失败

	// 脚本 (Script) 相关
	CodeScriptNotExist  = 4001 // 脚本不存在
	CodeScriptExist     = 4002 // 脚本已存在
	CodeScriptSaveErr   = 4003 // 脚本保存失败
	CodeScriptLoadErr   = 4004 // 脚本加载失败
	CodeScriptDeleteErr = 4005 // 脚本删除失败

	// 其他可扩展
)

// AppError 支持自定义错误
type AppError struct {
	Code int
	Msg  string
}

func (e *AppError) Error() string { return e.Msg }

func NewAppError(code int, msg string) *AppError {
	return &AppError{Code: code, Msg: msg}
}

// 常用错误变量（可按需扩展）
var (
	ErrParam    = NewAppError(CodeParamError, "参数错误")
	ErrNotFound = NewAppError(CodeNotFound, "资源未找到")
	ErrDB       = NewAppError(CodeDBError, "数据库操作失败")
	// 细化数据库错误
	ErrDBConn     = NewAppError(CodeDBConnError, "数据库连接失败")
	ErrDBQuery    = NewAppError(CodeDBQueryError, "数据库查询失败")
	ErrDBMeta     = NewAppError(CodeDBMetaError, "数据库元数据查询失败")
	ErrAuth       = NewAppError(CodeAuthError, "鉴权失败")
	ErrPermission = NewAppError(CodePermission, "权限不足")
	ErrConflict   = NewAppError(CodeConflict, "资源冲突")
	ErrTimeout    = NewAppError(CodeTimeout, "请求超时")
	ErrInternal   = NewAppError(CodeInternalError, "服务器内部错误")

	// 连接池相关
	ErrConnPoolFull     = NewAppError(CodeConnPoolFull, "连接池已满")
	ErrConnPoolClosed   = NewAppError(CodeConnPoolClosed, "连接池已关闭")
	ErrConnNotExist     = NewAppError(CodeConnNotExist, "连接不存在")
	ErrConnAlreadyExist = NewAppError(CodeConnAlreadyExist, "连接已存在")

	// 存储相关
	ErrGroupNotExist = NewAppError(CodeGroupNotExist, "分组不存在")
	ErrGroupExist    = NewAppError(CodeGroupExist, "分组已存在")
	ErrSaveFailed    = NewAppError(CodeSaveFailed, "保存失败")
	ErrLoadFailed    = NewAppError(CodeLoadFailed, "加载失败")
	ErrDeleteFailed  = NewAppError(CodeDeleteFailed, "删除失败")

	// 脚本 (Script) 相关
	ErrScriptNotExist  = NewAppError(CodeScriptNotExist, "脚本不存在")
	ErrScriptExist     = NewAppError(CodeScriptExist, "脚本已存在")
	ErrScriptSaveErr   = NewAppError(CodeScriptSaveErr, "脚本保存失败")
	ErrScriptLoadErr   = NewAppError(CodeScriptLoadErr, "脚本加载失败")
	ErrScriptDeleteErr = NewAppError(CodeScriptDeleteErr, "脚本删除失败")
)

// 响应辅助函数
func Success(data interface{}) Response {
	return Response{Code: CodeOK, Msg: "操作成功", Data: data}
}

func SuccessWithMsg(msg string, data interface{}) Response {
	return Response{Code: CodeOK, Msg: msg, Data: data}
}

func Error(msg string) Response {
	return Response{Code: CodeInternalError, Msg: msg}
}

func ErrorWithDetail(msg string, err error) Response {
	errorDetail := ""
	if err != nil {
		errorDetail = err.Error()
	}
	return Response{Code: CodeInternalError, Msg: msg, Error: errorDetail}
}

func ErrorWithCode(code int, msg string) Response {
	return Response{Code: code, Msg: msg}
}

func ErrorWithCodeAndDetail(code int, msg string, err error) Response {
	errorDetail := ""
	if err != nil {
		errorDetail = err.Error()
	}
	return Response{Code: code, Msg: msg, Error: errorDetail}
}

func ParamError(msg string) Response {
	return Response{Code: CodeParamError, Msg: msg}
}

func ParamErrorWithDetail(msg string, err error) Response {
	errorDetail := ""
	if err != nil {
		errorDetail = err.Error()
	}
	return Response{Code: CodeParamError, Msg: msg, Error: errorDetail}
}

func NotFound(msg string) Response {
	return Response{Code: CodeNotFound, Msg: msg}
}

func NotFoundWithDetail(msg string, err error) Response {
	errorDetail := ""
	if err != nil {
		errorDetail = err.Error()
	}
	return Response{Code: CodeNotFound, Msg: msg, Error: errorDetail}
}

func DBError(msg string) Response {
	return Response{Code: CodeDBError, Msg: msg}
}

func DBErrorWithDetail(msg string, err error) Response {
	errorDetail := ""
	if err != nil {
		errorDetail = err.Error()
	}
	return Response{Code: CodeDBError, Msg: msg, Error: errorDetail}
}

func GroupNotExistError(msg string) Response {
	return Response{Code: CodeGroupNotExist, Msg: msg}
}

func GroupNotExistErrorWithDetail(msg string, err error) Response {
	errorDetail := ""
	if err != nil {
		errorDetail = err.Error()
	}
	return Response{Code: CodeGroupNotExist, Msg: msg, Error: errorDetail}
}