const ghostBookshelf = require('./base');
const urlUtils = require('../../shared/url-utils');

const Collection = ghostBookshelf.Model.extend({
    tableName: 'collections',

    hooks: {
        belongsToMany: {
            /**
             * @this {Collection}
             * @param {*} existing
             * @param {*} targets
             * @param {*} options
             */
            after(existing, targets, options) {
                if (this.get('type') === 'automatic') {
                    return;
                }

                const queryOptions = {
                    query: {
                        where: {}
                    }
                };

                return Promise.all(targets.models.map((target, index) => {
                    queryOptions.query.where[existing.relatedData.otherKey] = target.id;

                    return existing.updatePivot({
                        sort_order: index
                    }, {
                        ...options,
                        ...queryOptions
                    });
                }));
            }
        }
    },

    formatOnWrite(attrs) {
        if (attrs.feature_image) {
            attrs.feature_image = urlUtils.toTransformReady(attrs.feature_image);
        }
        return attrs;
    },

    parse() {
        const attrs = ghostBookshelf.Model.prototype.parse.apply(this, arguments);

        if (attrs.feature_image) {
            attrs.feature_image = urlUtils.transformReadyToAbsolute(attrs.feature_image);
        }

        return attrs;
    },

    relationships: ['posts'],
    relationshipConfig: {
        posts: {
            editable: false
        }
    },

    relationshipBelongsTo: {
        posts: 'posts'
    },

    filterExpansions() {
        return [{
            key: 'posts',
            replacement: 'posts.id'
        }];
    },

    filterRelations() {
        return {
            posts: {
                tableName: 'posts',
                type: 'manyToMany',
                joinTable: 'collections_posts',
                joinFrom: 'collection_id',
                joinTo: 'post_id'
            }
        };
    },

    permittedAttributes() {
        let filteredKeys = ghostBookshelf.Model.prototype.permittedAttributes.apply(this, arguments);

        this.relationships.forEach((key) => {
            filteredKeys.push(key);
        });

        return filteredKeys;
    },

    posts() {
        return this.belongsToMany(
            'Post',
            'collections_posts',
            'collection_id',
            'post_id',
            'id',
            'id'
        );
    },

    collectionPosts() {
        return this.hasMany(
            'CollectionPost'
        );
    }
});

module.exports = {
    Collection: ghostBookshelf.model('Collection', Collection)
};