'use strict';

const fs = require('fs-extra');
const path = require('path');
const config = require('config');

const fetchItem = require('./item.js');
const interpolate = require('../interpolate.js');
const save = require('../save/save.js');
const textToStream = require('../save/textToStream.js');

module.exports = function(posts, user) {
    return Promise.all(posts.map(post => {
        return Promise.resolve().then(() => {
            return Promise.all(post.content.items.map((item, index) => {
                item.index = index;

                if(item.self) {
                    return Object.assign({}, item, {stream: textToStream(item.text)});
                }

                return fetchItem(item.url, 0).then(stream => {
                    return Object.assign({}, item, {stream});
                });
            }));
        }).then(items => {
            return Promise.all(items.map(item => {
                const type = item.type.split('/')[0];
                const filepath = post.content.album ? interpolate(config.library.album[type], user, post, item) : interpolate(config.library[type], user, post, item);

                return Promise.resolve().then(() => {
                    return fs.ensureDir(path.dirname(filepath));
                }).then(() => {
                    return save(filepath, item.stream)
                });
            }));
        });
    }));
};