class HttpException extends Error {
    // message为异常信息，code 为错误码(开发人员内部约定)，status 为HTTP状态码
    constructor(message, code, status) {
        super()
        this.status = status || 500
        this.code = code || 500
        this.message = message || '服务器异常'
    }
}

class ParameterException extends HttpException {
    constructor(message, code, status) {
        super()
        this.status = status || 402
        this.code = code
        this.message = message || '参数错误'
    }
}

class NotFound extends HttpException {
    constructor(message, code, status) {
        super()
        this.status = status || 404
        this.code = 404
        this.message = message || '资源未找到'
    }
}

class AuthFailed extends HttpException {
    constructor(message, code, status) {
        super()
        this.status = status || 401
        this.message = message || '授权失败'
        this.code = 401
    }
}

class Forbidden extends HttpException {
    constructor(message, code, status) {
        super()
        this.status = status || 403
        this.message = message || '禁止访问'
        this.code = 403
    }
}

module.exports = {
    HttpException: (message, code, status) => {throw new HttpException(message, code, status)},
    ParameterException: (message, code, status) => {throw new ParameterException(message, code, status)},
    NotFound: (message, code, status) => {throw new NotFound(message, code, status)},
    AuthFailed: (message, code, status) => {throw new AuthFailed(message, code, status)},
    Forbidden: (message, code, status) => {throw new Forbidden(message, code, status)},
}