'use strict';

const assert = require('node:assert'),
    constants = require('../constants.js'),
    BoxError = require('../boxerror.js'),
    debug = require('debug')('box:dns/vultr'),
    dig = require('../dig.js'),
    dns = require('../dns.js'),
    safe = require('safetydance'),
    timers = require('timers/promises'),
    superagent = require('@cloudron/superagent'),
    waitForDns = require('./waitfordns.js');

const DESEC_ENDPOINT = 'https://desec.io/api/v1';

function formatError(response) {
    return `deSEC DNS error [${response.status}] ${response.text}`;
}

function removePrivateFields(domainObject) {
    delete domainObject.config.token;
    return domainObject;
}

function injectPrivateFields(newConfig, currentConfig) {
    if (!Object.hasOwn(newConfig, 'token')) newConfig.token = currentConfig.token;
}

async function get(domainObject, location, type) {
    assert.strictEqual(typeof domainObject, 'object');
    assert.strictEqual(typeof location, 'string');
    assert.strictEqual(typeof type, 'string');

    const domainConfig = domainObject.config,
        zoneName = domainObject.zoneName,
        name = dns.getName(domainObject, location, type) || '@';

    await timers.setTimeout(1000); // https://desec.readthedocs.io/en/latest/rate-limits.html

    const [error, response] = await safe(superagent.get(`${DESEC_ENDPOINT}/domains/${zoneName}/rrsets/${name}/${type}`)
        .set('Authorization', `Token ${domainConfig.token}`)
        .timeout(30 * 1000)
        .retry(5)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error);
    if (response.status === 404) return [];
    if (response.status === 403 || response.status === 401) throw new BoxError(BoxError.ACCESS_DENIED, formatError(response));
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, formatError(response));
    if (!Array.isArray(response.body.records)) throw new BoxError(BoxError.EXTERNAL_ERROR, formatError(response));

    return response.body.records;
}

async function del(domainObject, location, type, values) {
    assert.strictEqual(typeof domainObject, 'object');
    assert.strictEqual(typeof location, 'string');
    assert.strictEqual(typeof type, 'string');
    assert(Array.isArray(values));

    const domainConfig = domainObject.config,
        zoneName = domainObject.zoneName,
        name = dns.getName(domainObject, location, type) || '@';

    await timers.setTimeout(1000); // https://desec.readthedocs.io/en/latest/rate-limits.html
    const [error, response] = await safe(superagent.del(`${DESEC_ENDPOINT}/domains/${zoneName}/rrsets/${name}/${type}/`)
        .set('Authorization', `Token ${domainConfig.token}`)
        .timeout(30 * 1000)
        .retry(5)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error);
    if (response.status === 404) return;
    if (response.status === 403 || response.status === 401) throw new BoxError(BoxError.ACCESS_DENIED, formatError(response));
    if (response.status !== 204) throw new BoxError(BoxError.EXTERNAL_ERROR, formatError(response));
}

async function upsert(domainObject, location, type, values) {
    assert.strictEqual(typeof domainObject, 'object');
    assert.strictEqual(typeof location, 'string');
    assert.strictEqual(typeof type, 'string');
    assert(Array.isArray(values));

    const domainConfig = domainObject.config,
        zoneName = domainObject.zoneName,
        name = dns.getName(domainObject, location, type) || ''; // when upsert, we use '' and not '@'

    await del(domainObject, location, type, values);

    const data = {
        subname: name,
        type,
        ttl: 3600, // min
        records: values
    };

    await timers.setTimeout(1000); // https://desec.readthedocs.io/en/latest/rate-limits.html
    const [error, response] = await safe(superagent.post(`${DESEC_ENDPOINT}/domains/${zoneName}/rrsets/`)
        .set('Authorization', `Token ${domainConfig.token}`)
        .send(data)
        .timeout(30 * 1000)
        .retry(5)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error);
    if (response.status === 403 || response.status === 401) throw new BoxError(BoxError.ACCESS_DENIED, formatError(response));
    if (response.status !== 201) throw new BoxError(BoxError.EXTERNAL_ERROR, formatError(response));
}

async function wait(domainObject, subdomain, type, value, options) {
    assert.strictEqual(typeof domainObject, 'object');
    assert.strictEqual(typeof subdomain, 'string');
    assert.strictEqual(typeof type, 'string');
    assert.strictEqual(typeof value, 'string');
    assert(options && typeof options === 'object'); // { interval: 5000, times: 50000 }

    const fqdn = dns.fqdn(subdomain, domainObject.domain);

    await waitForDns(fqdn, domainObject.zoneName, type, value, options);
}

async function verifyDomainConfig(domainObject) {
    assert.strictEqual(typeof domainObject, 'object');

    const domainConfig = domainObject.config,
        zoneName = domainObject.zoneName;

    if (!domainConfig.token || typeof domainConfig.token !== 'string') throw new BoxError(BoxError.BAD_FIELD, 'token must be a non-empty string');
    if ('customNameservers' in domainConfig && typeof domainConfig.customNameservers !== 'boolean') throw new BoxError(BoxError.BAD_FIELD, 'customNameservers must be a boolean');

    const ip = '127.0.0.1';

    const credentials = {
        token: domainConfig.token,
        customNameservers: !!domainConfig.customNameservers
    };

    if (constants.TEST) credentials; // this shouldn't be here

    const [error, nameservers] = await safe(dig.resolve(zoneName, 'NS', { timeout: 5000 }));
    if (error && error.code === 'ENOTFOUND') throw new BoxError(BoxError.BAD_FIELD, 'Unable to resolve nameservers for this domain');
    if (error || !nameservers) throw new BoxError(BoxError.BAD_FIELD, error ? error.message : 'Unable to get nameservers');

    if (!nameservers.every(function (n) { return n.toLowerCase().indexOf('.desec.') !== -1; })) {
        debug('verifyDomainConfig: %j does not contains deSEC NS', nameservers);
        if (!domainConfig.customNameservers) throw new BoxError(BoxError.BAD_FIELD, 'Domain nameservers are not set to deSEC');
    }

    const location = 'cloudrontestdns';

    await upsert(domainObject, location, 'A', [ ip ]);
    debug('verifyDomainConfig: Test A record added');

    await del(domainObject, location, 'A', [ ip ]);
    debug('verifyDomainConfig: Test A record removed again');

    return credentials;
}

exports = module.exports = {
    removePrivateFields,
    injectPrivateFields,
    upsert,
    get,
    del,
    wait,
    verifyDomainConfig
};