/**
 * ValidationResponse.
 *
 * Represents a response that originates from
 */
class ValidationResponse {
    constructor()
    {
        this._valid = false;
        this._errors = [];
        this.toJSON = this._toJson.bind(this);
    }

    /**
     * @param {string} json
     * @return {ValidationResponse|null}
     */
    static fromJsonString(json) {
        if(!this.is(json)) {
            return null;
        }
        let jsonObject = JSON.parse(json);

        let instance = new this;
        instance._valid = jsonObject.valid;
        instance._errors = jsonObject.errors;

        return instance;
    }

    /**
     * Checks that the given json string represents a ErrorResponse
     *
     * @param {string} json
     * @param {boolean} logErrors
     * @return {boolean}
     */
    static is(json, logErrors = true)
    {
        let jsonObject = null;
        try {
            jsonObject = JSON.parse(json);
            if(!jsonObject) return false;
        } catch (e) {
            console.error('ValidationResponse: The given json does not represent a ValidationResponse since the json string was not a valid json. Object: ', jsonObject);
            return false;
        }

        if(!jsonObject.hasOwnProperty('valid')) {
            console.error('ValidationResponse: The given json object must have an "valid" property that is a string. But did not have one. Object: ', jsonObject);
            return false;
        }

        if(!jsonObject.hasOwnProperty('errors') || typeof !jsonObject.errors == 'object') {
            console.error('ValidationResponse: The given json object must have an errors object. But did not have one. Object: ', jsonObject);
            return false;
        }

        return true;
    }


    /**
     * @return {{valid: boolean, errors: Array}}
     * @private
     */
    _toJson() {
        return {
            'valid': this._valid,
            'errors': this._errors
        }
    }

    /**
     * @return {boolean}
     */
    get valid() {
        return this._valid;
    }

    /**
     * @return {Array}
     */
    get errors() {
        return this._errors;
    }
}

export { ValidationResponse }