const _ = require('lodash'),
    debug = require('ghost-ignition').debug('services:routing:controllers:collection'),
    common = require('../../../lib/common'),
    security = require('../../../lib/security'),
    themes = require('../../themes'),
    filters = require('../../../filters'),
    helpers = require('../helpers');

module.exports = function collectionController(req, res, next) {
    debug('collectionController', req.params, res.locals.routerOptions);

    const pathOptions = {
        page: req.params.page !== undefined ? req.params.page : 1,
        slug: req.params.slug ? security.string.safe(req.params.slug) : undefined
    };

    if (pathOptions.page) {
        const postsPerPage = parseInt(themes.getActive().config('posts_per_page'));

        // CASE: no negative posts per page
        if (!isNaN(postsPerPage) && postsPerPage > 0) {
            pathOptions.limit = postsPerPage;
        }
    }

    return helpers.fetchData(pathOptions, res.locals.routerOptions)
        .then(function handleResult(result) {
            // CASE: requested page is greater than number of pages we have
            if (pathOptions.page > result.meta.pagination.pages) {
                return next(new common.errors.NotFoundError({
                    message: common.i18n.t('errors.errors.pageNotFound')
                }));
            }

            // Format data 1
            // @TODO: figure out if this can be removed, it's supposed to ensure that absolutely URLs get generated
            // correctly for the various objects, but I believe it doesn't work and a different approach is needed.
            helpers.secure(req, result.posts);

            // @TODO: get rid of this O_O
            _.each(result.data, function (data) {
                helpers.secure(req, data);
            });

            // @TODO: properly design these filters
            filters.doFilter('prePostsRender', result.posts, res.locals)
                .then(function (posts) {
                    result.posts = posts;
                    return result;
                })
                .then(helpers.renderCollection(req, res));
        })
        .catch(helpers.handleError(next));
};