import { getLangText } from './lang';

import GlobalNotificationActions from '../actions/global_notification_actions';
import GlobalNotificationModel from '../models/global_notification_model';

/**
 * Validates a given list of forms
 * @param  {Form[]}  forms                   List of forms, each of which should have a `validate`
 *                                           method available
 * @param  {boolean} showFailureNotification Show global notification if there are validation failures
 * @return {boolean}                         True if validation did *NOT* catch any errors
 */
export function validateForms(forms, showFailureNotification) {
    const validationSuccessful = forms.reduce((result, form) => {
        if (form && typeof form.validate === 'function') {
            return form.validate() && result;
        } else {
            throw new Error('Form given for validation does not have a `validate` method');
        }
    }, true);

    if (!validationSuccessful && showFailureNotification) {
        const notification = new GlobalNotificationModel(
            getLangText('Oops, there may be missing or invalid fields. Please check your inputs again.'),
            'danger'
        );
        GlobalNotificationActions.appendGlobalNotification(notification);
    }

    return validationSuccessful;
}

/**
 * Get the data ids of the given piece or editions.
 * @param  {boolean} isPiece                   Is the given entities parameter a piece?
 *                                             (False: array of editions)
 * @param  {(object|object[])} pieceOrEditions Piece or array of editions
 * @return {(object|object[])}                 Data IDs of the pieceOrEditions for the form
 */
export function getAclFormDataId(isPiece, pieceOrEditions) {
    if (isPiece) {
        return { piece_id: pieceOrEditions.id };
    } else {
        return {
            bitcoin_id: pieceOrEditions.map((edition) => edition.bitcoin_id).join()
        };
    }
}

/**
 * Generates a message for submitting a form
 * @param  {object} options                     Options object for creating the message:
 * @param  {string} options.aclName             Enum name of an acl
 * @param  {(object|object[])} options.entities Piece or array of Editions
 * @param  {boolean} options.isPiece            Is the given entities parameter a piece?
 *                                              (False: array of editions)
 * @param  {string} [options.senderName]        Name of the sender
 * @return {string}                             Completed message
 */
export function getAclFormMessage({ aclName, additionalMessage, entities, isPiece, senderName }) {
    if (aclName === undefined || isPiece === undefined ||
        !(typeof entities === 'object' || Array.isArray(entities))) {
        throw new Error('You must specify an acl class, entities in the correct format, and ' +
                        'entity type');
    }

    const entityTitles = isPiece ? getTitlesStringOfPiece(entities)
                                 : getTitlesStringOfEditions(entities);

    let message = `${getLangText('Hi')},\n\n`;

    if (aclName === 'acl_transfer') {
        message += getLangText('I transfer ownership of');
    } else if (aclName === 'acl_consign') {
        message += getLangText('I consign');
    } else if (aclName === 'acl_unconsign') {
        message += getLangText('I un-consign');
    } else if (aclName === 'acl_loan') {
        message += getLangText('I loan');
    } else if (aclName === 'acl_loan_request') {
        message += getLangText('I request to loan');
    } else if (aclName === 'acl_share') {
        message += getLangText('I share');
    } else {
        throw new Error('Your specified aclName did not match a an acl class.');
    }

    message += `:\n${entityTitles}`;

    if (aclName === 'acl_transfer' || aclName === 'acl_loan' || aclName === 'acl_consign') {
        message += getLangText('to you');
    } else if (aclName === 'acl_unconsign' || aclName === 'acl_loan_request') {
        message += getLangText('from you');
    } else if (aclName === 'acl_share') {
        message += getLangText('with you');
    } else {
        throw new Error('Your specified aclName did not match a an acl class.');
    }

    if (additionalMessage) {
        message += `\n\n${additionalMessage}`;
    }

    if (senderName) {
        message += `\n\n${getLangText('Truly yours')},\n${senderName}`;
    }

    return message;
}

function getTitlesStringOfPiece(piece) {
    return `"${piece.title}"`;
}

function getTitlesStringOfEditions(editions) {
    return editions.map((edition) => (
        `- "${edition.title}, ${getLangText('edition')} ${edition.edition_number}"\n`)
    ).join();
}