'use strict';

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

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

async function findSite(url) {
    const { hostname } = new URL(url);
    const domain = hostname.replace(/^www./, '');

    /*
    const site = await knex('sites')
        .where({ url: `${protocol}//www.${domain}` })
        .orWhere({ url: `${protocol}//${domain}` })
        .first()
        // scene might use generic network URL, let network scraper determine channel site
        || await knex('networks')
            .where({ url: `${protocol}//www.${hostname}` })
            .orWhere({ url: `${protocol}//${hostname}` })
            .first();
    */

    const site = await knex('sites')
        .where('url', 'like', `%${domain}`)
        .first()
        // scene might use generic network URL, let network scraper determine channel site
        || await knex('networks')
            .where('url', 'like', `%${domain}`)
            .first();

    return {
        id: site.id,
        name: site.name,
        description: site.description,
        url: site.url,
        network: {
            id: site.network_id || site.id,
        },
        parameters: site.parameters && JSON.parse(site.parameters),
        isFallback: site.network_id === undefined,
    };
}

function deriveFilename(scene) {
    const props = {
        siteName: scene.site.name,
        sceneId: scene.shootId,
        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 = await findSite(url);
    const scraper = scrapers[site.id] || scrapers[site.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);

    knex.destroy();

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

module.exports = fetchScene;