'use strict';

const config = require('config');
const moment = require('moment');

const networks = require('./networks');
const scrapers = require('./scrapers');

function findSite(url) {
    const { origin } = new URL(url);

    return Object.entries(networks)
        .reduce((foundNetwork, [networkId, network]) => foundNetwork || Object.entries(network.sites)
            .reduce((foundSite, [siteId, site]) => {
                if (foundSite) return foundSite;
                if (site.url !== origin) return null;

                return {
                    site: {
                        ...site,
                        id: siteId,
                    },
                    network: {
                        ...network,
                        id: networkId,
                    },
                };
            }, null),
        null);
}

function deriveFilename(scene) {
    const props = {
        siteName: scene.site.name,
        sceneId: scene.id,
        sceneTitle: scene.title,
        sceneActors: scene.actors.join(config.filename.actorsJoin),
        sceneDate: moment.utc(scene.date).format(config.filename.dateFormat),
    };

    const filename = config.filename.pattern.replace(/\{\w+\}/g, (match) => {
        const prop = match.slice(1, -1);
        const value = props[prop];

        if (value && config.filename.subpatterns[prop]) {
            return config.filename.subpatterns[prop]
                .replace(/\{\w+\}/, value)
                .replace(/\//g, config.filename.slash);
        }

        if (value) {
            return value.replace(/\//g, config.filename.slash) || '';
        }

        return '';
    });

    return filename;
}

async function fetchScene(url) {
    const { site, network } = findSite(url);
    const scraper = scrapers[site.id] || scrapers[network.id];

    if (!scraper) {
        throw new Error('Could not find scraper for URL');
    }

    if (!scraper.fetchScene) {
        throw new Error(`The '${site.name}'-scraper cannot fetch individual scenes`);
    }

    const scene = await scraper.fetchScene(url, site);
    const filename = deriveFilename(scene);

    return {
        ...scene,
        filename,
        copy: filename,
    };
}

module.exports = fetchScene;