'use strict';

const config = require('config');

const argv = require('./argv');
const knex = require('./knex');
const whereOr = require('./utils/where-or');

async function curateSite(site, includeParameters = false) {
    const parameters = JSON.parse(site.parameters);

    return {
        id: site.id,
        name: site.name,
        url: site.url,
        description: site.description,
        slug: site.slug,
        independent: !!parameters && parameters.independent,
        parameters: includeParameters ? parameters : null,
        network: {
            id: site.network_id,
            name: site.network_name,
            description: site.network_description,
            slug: site.network_slug,
            url: site.network_url,
            parameters: includeParameters ? JSON.parse(site.network_parameters) : null,
        },
    };
}

function curateSites(sites, includeParameters) {
    return Promise.all(sites.map(async site => curateSite(site, includeParameters)));
}

function destructConfigNetworks(networks) {
    return networks.reduce((acc, network) => {
        if (Array.isArray(network)) {
            // network specifies sites
            return {
                ...acc,
                sites: [...acc.sites, ...network[1]],
            };
        }

        return {
            ...acc,
            networks: [...acc.networks, network],
        };
    }, {
        networks: [],
        sites: [],
    });
}

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

    const site = await knex('sites')
        .leftJoin('networks', 'sites.network_id', 'networks.id')
        .select(
            'sites.*',
            'networks.name as network_name', 'networks.slug as network_slug', 'networks.url as network_url', 'networks.description as network_description', 'networks.parameters as network_parameters',
        )
        .where('sites.url', 'like', `%${domain}%`)
        .first();

    if (site) {
        return curateSite(site, true);
    }

    return null;
}

function sitesByNetwork(sites) {
    const networks = sites.reduce((acc, site) => {
        if (acc[site.network.slug]) {
            acc[site.network.slug].sites = acc[site.network.slug].sites.concat(site);

            return acc;
        }

        acc[site.network.slug] = {
            ...site.network,
            sites: [site],
        };

        return acc;
    }, {});

    return Object.values(networks);
}

async function fetchSitesFromArgv() {
    const rawSites = await knex('sites')
        .select('sites.*', 'networks.name as network_name', 'networks.slug as network_slug', 'networks.parameters as network_parameters')
        .whereIn('sites.slug', argv.sites || [])
        .orWhereIn('networks.slug', argv.networks || [])
        .leftJoin('networks', 'sites.network_id', 'networks.id');

    const curatedSites = await curateSites(rawSites, true);
    console.log(`Found ${curatedSites.length} sites in database`);

    return sitesByNetwork(curatedSites);
}

async function fetchSitesFromConfig() {
    const included = destructConfigNetworks(config.include);

    const networks = await knex('networks').select('id').whereIn('slug', included.networks || []);
    const networkIds = networks.map(network => network.id);

    const rawSites = await knex('sites')
        .select('sites.*', 'networks.name as network_name')
        .whereIn('sites.slug', included.sites || [])
        .orWhereIn('network_id', networkIds)
        .leftJoin('networks', 'sites.network_id', 'networks.id');

    const curatedSites = await curateSites(rawSites, true);
    console.log(`Found ${curatedSites.length} sites in database`);

    return sitesByNetwork(curatedSites);
}

async function fetchIncludedSites() {
    if (argv.networks || argv.sites) {
        return fetchSitesFromArgv();
    }

    return fetchSitesFromConfig();
}

async function fetchSites(queryObject) {
    const sites = await knex('sites')
        .where(builder => whereOr(queryObject, 'sites', builder))
        .select(
            'sites.*',
            'networks.name as network_name', 'networks.slug as network_slug', 'networks.url as network_url', 'networks.description as network_description', 'networks.parameters as network_parameters',
        )
        .leftJoin('networks', 'sites.network_id', 'networks.id')
        .limit(100);

    return curateSites(sites);
}

async function fetchSitesFromReleases() {
    const sites = await knex('releases')
        .select('site_id', '')
        .leftJoin('sites', 'sites.id', 'releases.site_id')
        .groupBy('sites.id')
        .limit(100);

    return curateSites(sites);
}

module.exports = {
    curateSites,
    fetchIncludedSites,
    fetchSites,
    fetchSitesFromConfig,
    fetchSitesFromArgv,
    fetchSitesFromReleases,
    findSiteByUrl,
};