'use strict';

exports = module.exports = {
    getFeatures,

    getApiServerOrigin,
    getWebServerOrigin,
    getConsoleServerOrigin,

    downloadManifest,
    getApps,
    getApp,
    getAppVersion,
    downloadIcon,

    registerCloudronWithSetupToken,
    registerCloudronWithLogin,
    updateCloudron,

    purchaseApp,
    unpurchaseApp,

    getSubscription,
    isFreePlan,

    getAppUpdate,
    getBoxUpdate,

    createTicket,

    // exported for tests
    _setApiServerOrigin: setApiServerOrigin,
    _unregister: unregister
};

const apps = require('./apps.js'),
    assert = require('assert'),
    BoxError = require('./boxerror.js'),
    constants = require('./constants.js'),
    dashboard = require('./dashboard.js'),
    debug = require('debug')('box:appstore'),
    eventlog = require('./eventlog.js'),
    network = require('./network.js'),
    path = require('path'),
    paths = require('./paths.js'),
    promiseRetry = require('./promise-retry.js'),
    safe = require('safetydance'),
    semver = require('semver'),
    settings = require('./settings.js'),
    shell = require('./shell.js'),
    superagent = require('superagent'),
    support = require('./support.js');

// These are the default options and will be adjusted once a subscription state is obtained
// Keep in sync with appstore/routes/cloudrons.js
let gFeatures = {
    userMaxCount: 5,
    userGroups: false,
    userRoles: false,
    domainMaxCount: 1,
    externalLdap: false,
    privateDockerRegistry: false,
    branding: false,
    support: false,
    profileConfig: false,
    mailboxMaxCount: 5,
    emailPremium: false
};

// attempt to load feature cache in case appstore would be down
let tmp = safe.JSON.parse(safe.fs.readFileSync(paths.FEATURES_INFO_FILE, 'utf8'));
if (tmp) gFeatures = tmp;

function getFeatures() {
    return gFeatures;
}

async function getApiServerOrigin() {
    return await settings.get(settings.API_SERVER_ORIGIN_KEY) || 'https://api.cloudron.io';
}

async function setApiServerOrigin(origin) {
    assert.strictEqual(typeof origin, 'string');
    await settings.set(settings.API_SERVER_ORIGIN_KEY, origin);
}

async function getWebServerOrigin() {
    return await settings.get(settings.WEB_SERVER_ORIGIN_KEY) || 'https://cloudron.io';
}

async function getConsoleServerOrigin() {
    return await settings.get(settings.CONSOLE_SERVER_ORIGIN_KEY) || 'https://console.cloudron.io';
}

async function login(email, password, totpToken) {
    assert.strictEqual(typeof email, 'string');
    assert.strictEqual(typeof password, 'string');
    assert.strictEqual(typeof totpToken, 'string');

    const [error, response] = await safe(superagent.post(`${await getApiServerOrigin()}/api/v1/login`)
        .send({ email, password, totpToken })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS, response.body.message);
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `Login error. status code: ${response.status}`);
    if (!response.body.accessToken) throw new BoxError(BoxError.EXTERNAL_ERROR, `Login error. invalid response: ${response.text}`);

    return response.body; // { userId, accessToken }
}

async function registerUser(email, password) {
    assert.strictEqual(typeof email, 'string');
    assert.strictEqual(typeof password, 'string');

    const [error, response] = await safe(superagent.post(`${await getApiServerOrigin()}/api/v1/register_user`)
        .send({ email, password, utmSource: 'cloudron-dashboard' })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 409) throw new BoxError(BoxError.ALREADY_EXISTS, 'Registration error: account already exists');
    if (response.status !== 201) throw new BoxError(BoxError.EXTERNAL_ERROR, `Registration error. invalid response: ${response.status}`);
}

async function getSubscription() {
    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const [error, response] = await safe(superagent.get(`${await getApiServerOrigin()}/api/v1/subscription`)
        .query({ accessToken: token })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status === 502) throw new BoxError(BoxError.EXTERNAL_ERROR, `Stripe error: ${response.status} ${JSON.stringify(response.body)}`);
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `Unknown error: ${response.status} ${JSON.stringify(response.body)}`);

    // update the features cache
    gFeatures = response.body.features;
    safe.fs.writeFileSync(paths.FEATURES_INFO_FILE, JSON.stringify(gFeatures), 'utf8');

    return response.body;
}

function isFreePlan(subscription) {
    return !subscription || subscription.plan.id === 'free';
}

// See app.js install it will create a db record first but remove it again if appstore purchase fails
async function purchaseApp(data) {
    assert.strictEqual(typeof data, 'object'); // { appstoreId, manifestId, appId }
    assert(data.appstoreId || data.manifestId);
    assert.strictEqual(typeof data.appId, 'string');

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const [error, response] = await safe(superagent.post(`${await getApiServerOrigin()}/api/v1/cloudronapps`)
        .send(data)
        .query({ accessToken: token })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 404) throw new BoxError(BoxError.NOT_FOUND); // appstoreId does not exist
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status === 402) throw new BoxError(BoxError.LICENSE_ERROR, response.body.message);
    // 200 if already purchased, 201 is newly purchased
    if (response.status !== 201 && response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `App purchase failed. ${response.status} ${JSON.stringify(response.body)}`);
}

async function unpurchaseApp(appId, data) {
    assert.strictEqual(typeof appId, 'string');
    assert.strictEqual(typeof data, 'object'); // { appstoreId, manifestId }
    assert(data.appstoreId || data.manifestId);

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const url = `${await getApiServerOrigin()}/api/v1/cloudronapps/${appId}`;

    let [error, response] = await safe(superagent.get(url)
        .query({ accessToken: token })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 404) return;   // was never purchased
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `App unpurchase failed to get app. status:${response.status}`);

    [error, response] = await safe(superagent.del(url)
        .send(data)
        .query({ accessToken: token })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status !== 204) throw new BoxError(BoxError.EXTERNAL_ERROR, `App unpurchase failed. status:${response.status}`);
}

async function getBoxUpdate(options) {
    assert.strictEqual(typeof options, 'object');

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const query = {
        accessToken: token,
        boxVersion: constants.VERSION,
        automatic: options.automatic
    };

    const [error, response] = await safe(superagent.get(`${await getApiServerOrigin()}/api/v1/boxupdate`)
        .query(query)
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status === 204) return; // no update
    if (response.status !== 200 || !response.body) throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response: ${response.status} ${response.text}`);

    const updateInfo = response.body;

    if (!semver.valid(updateInfo.version) || semver.gt(constants.VERSION, updateInfo.version)) {
        throw new BoxError(BoxError.EXTERNAL_ERROR, `Update version invalid or is a downgrade: ${response.status} ${response.text}`);
    }

    // updateInfo: { version, changelog, sourceTarballUrl, sourceTarballSigUrl, boxVersionsUrl, boxVersionsSigUrl }
    if (!updateInfo.version || typeof updateInfo.version !== 'string') throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad version): ${response.status} ${response.text}`);
    if (!updateInfo.changelog || !Array.isArray(updateInfo.changelog)) throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad changelog): ${response.status} ${response.text}`);
    if (!updateInfo.sourceTarballUrl || typeof updateInfo.sourceTarballUrl !== 'string') throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad sourceTarballUrl): ${response.status} ${response.text}`);
    if (!updateInfo.sourceTarballSigUrl || typeof updateInfo.sourceTarballSigUrl !== 'string') throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad sourceTarballSigUrl): ${response.status} ${response.text}`);
    if (!updateInfo.boxVersionsUrl || typeof updateInfo.boxVersionsUrl !== 'string') throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad boxVersionsUrl): ${response.status} ${response.text}`);
    if (!updateInfo.boxVersionsSigUrl || typeof updateInfo.boxVersionsSigUrl !== 'string') throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad boxVersionsSigUrl): ${response.status} ${response.text}`);
    if (typeof updateInfo.unstable !== 'boolean') throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response (bad unstable): ${response.status} ${response.text}`);

    return updateInfo;
}

async function getAppUpdate(app, options) {
    assert.strictEqual(typeof app, 'object');
    assert.strictEqual(typeof options, 'object');

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const query = {
        accessToken: token,
        boxVersion: constants.VERSION,
        appId: app.appStoreId,
        appVersion: app.manifest.version,
        automatic: options.automatic
    };

    const [error, response] = await safe(superagent.get(`${await getApiServerOrigin()}/api/v1/appupdate`)
        .query(query)
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status === 204) return; // no update
    if (response.status !== 200 || !response.body) throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response: ${response.status} ${response.text}`);

    const updateInfo = response.body;

    // for the appstore, x.y.z is the same as x.y.z-0 but in semver, x.y.z > x.y.z-0
    const curAppVersion = semver.prerelease(app.manifest.version) ? app.manifest.version : `${app.manifest.version}-0`;

    // do some sanity checks
    if (!safe.query(updateInfo, 'manifest.version') || semver.gt(curAppVersion, safe.query(updateInfo, 'manifest.version'))) {
        debug('Skipping malformed update of app %s version: %s. got %j', app.id, curAppVersion, updateInfo);
        throw new BoxError(BoxError.EXTERNAL_ERROR, `Malformed update: ${response.status} ${response.text}`);
    }

    updateInfo.unstable = !!updateInfo.unstable;

    // { id, creationDate, manifest, unstable }
    return updateInfo;
}

async function registerCloudron(data) {
    assert.strictEqual(typeof data, 'object');

    const { domain, setupToken, accessToken, version, existingApps } = data;

    const [error, response] = await safe(superagent.post(`${await getApiServerOrigin()}/api/v1/register_cloudron`)
        .send({ domain, setupToken, accessToken, version, existingApps })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 401) throw new BoxError(BoxError.LICENSE_ERROR, 'Setup token invalid');
    if (response.status !== 201) throw new BoxError(BoxError.EXTERNAL_ERROR, `Unable to register cloudron: ${response.statusCode} ${error.message}`);

    if (!response.body.cloudronId) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Invalid response - no cloudron id');
    if (!response.body.cloudronToken) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Invalid response - no token');

    await settings.set(settings.CLOUDRON_ID_KEY, response.body.cloudronId);
    await settings.set(settings.APPSTORE_API_TOKEN_KEY, response.body.cloudronToken);

    debug(`registerCloudron: Cloudron registered with id ${response.body.cloudronId}`);

    // app could already have been installed if we deleted the cloudron.io record and user re-registers
    for (const app of await apps.list()) {
        await purchaseApp({ appId: app.id, appstoreId: app.appStoreId, manifestId: app.manifest.id || 'customapp' });
    }
}

async function updateCloudron(data) {
    assert.strictEqual(typeof data, 'object');

    const { domain } = data;

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const query = {
        accessToken: token
    };

    const [error, response] = await safe(superagent.post(`${await getApiServerOrigin()}/api/v1/update_cloudron`)
        .query(query)
        .send({ domain })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response: ${response.status} ${response.text}`);

    debug(`updateCloudron: Cloudron updated with data ${JSON.stringify(data)}`);
}

async function registerCloudronWithSetupToken(options) {
    assert.strictEqual(typeof options, 'object');

    const { domain } = await dashboard.getLocation();

    await registerCloudron({ domain, setupToken: options.setupToken, version: constants.VERSION });
}

async function registerCloudronWithLogin(options) {
    assert.strictEqual(typeof options, 'object');

    if (options.signup) await registerUser(options.email, options.password);
    const result = await login(options.email, options.password, options.totpToken || '');

    const { domain } = await dashboard.getLocation();

    await registerCloudron({ domain, accessToken: result.accessToken, version: constants.VERSION });
}

async function unregister() {
    await settings.set(settings.CLOUDRON_ID_KEY, '');
    await settings.set(settings.APPSTORE_API_TOKEN_KEY, '');
}

async function createTicket(info, auditSource) {
    assert.strictEqual(typeof info, 'object');
    assert.strictEqual(typeof info.email, 'string');
    assert.strictEqual(typeof info.displayName, 'string');
    assert.strictEqual(typeof info.type, 'string');
    assert.strictEqual(typeof info.subject, 'string');
    assert.strictEqual(typeof info.description, 'string');
    assert.strictEqual(typeof auditSource, 'object');

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    if (info.enableSshSupport) {
        await safe(support.enableRemoteSupport(true, auditSource));
        info.ipv4 = await network.getIPv4();
    }

    info.app = info.appId ? await apps.get(info.appId) : null;
    info.supportEmail = constants.SUPPORT_EMAIL; // destination address for tickets

    const request = superagent.post(`${await getApiServerOrigin()}/api/v1/ticket`)
        .query({ accessToken: token })
        .timeout(60 * 1000)
        .ok(() => true);

    // either send as JSON through body or as multipart, depending on attachments
    if (info.app) {
        request.field('infoJSON', JSON.stringify(info));

        const logPaths = await apps.getLogPaths(info.app);
        for (const logPath of logPaths) {
            const [error, logs] = await safe(shell.exec('createTicket', `tail --lines=1000 ${logPath}`, {}));
            if (!error && logs) request.attach(path.basename(logPath), logs, path.basename(logPath));
        }
    } else {
        request.send(info);
    }

    const [error, response] = await safe(request);
    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status !== 201) throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response: ${response.status} ${response.text}`);

    await eventlog.add(eventlog.ACTION_SUPPORT_TICKET, auditSource, info);

    return { message: `An email was sent to ${constants.SUPPORT_EMAIL}. We will get back shortly!` };
}

async function downloadManifest(appStoreId, manifest) {
    if (!appStoreId && !manifest) throw new BoxError(BoxError.BAD_FIELD, 'Neither manifest nor appStoreId provided');

    if (!appStoreId) return { appStoreId: '', manifest };

    const parts = appStoreId.split('@');

    const url = await getApiServerOrigin() + '/api/v1/apps/' + parts[0] + (parts[1] ? '/versions/' + parts[1] : '');

    debug(`downloading manifest from ${url}`);

    const [error, response] = await safe(superagent.get(url).timeout(60 * 1000).ok(() => true));

    if (error) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Network error downloading manifest:' + error.message);

    if (response.status !== 200) throw new BoxError(BoxError.NOT_FOUND, `Failed to get app info from store. status: ${response.status} text: ${response.text}`);

    if (!response.body.manifest || typeof response.body.manifest !== 'object') throw new BoxError(BoxError.NOT_FOUND, `Missing manifest. Failed to get app info from store. status: ${response.status} text: ${response.text}`);

    return { appStoreId: parts[0], manifest: response.body.manifest };
}

async function getApps() {
    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    const [error, response] = await safe(superagent.get(`${await getApiServerOrigin()}/api/v1/apps`)
        .query({ accessToken: token, boxVersion: constants.VERSION, unstable: true })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 403 || response.status === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `App listing failed. ${response.status} ${JSON.stringify(response.body)}`);
    if (!response.body.apps) throw new BoxError(BoxError.EXTERNAL_ERROR, `Bad response: ${response.status} ${response.text}`);

    return response.body.apps;
}

async function getAppVersion(appId, version) {
    assert.strictEqual(typeof appId, 'string');
    assert.strictEqual(typeof version, 'string');

    const token = await settings.get(settings.APPSTORE_API_TOKEN_KEY);
    if (!token) throw new BoxError(BoxError.LICENSE_ERROR, 'Missing token');

    let url = `${await getApiServerOrigin()}/api/v1/apps/${appId}`;
    if (version !== 'latest') url += `/versions/${version}`;

    const [error, response] = await safe(superagent.get(url)
        .query({ accessToken: token })
        .timeout(60 * 1000)
        .ok(() => true));

    if (error) throw new BoxError(BoxError.NETWORK_ERROR, error.message);
    if (response.status === 403 || response.statusCode === 401) throw new BoxError(BoxError.INVALID_CREDENTIALS);
    if (response.status === 404) throw new BoxError(BoxError.NOT_FOUND);
    if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `App fetch failed. ${response.status} ${JSON.stringify(response.body)}`);

    return response.body;
}

async function getApp(appId) {
    assert.strictEqual(typeof appId, 'string');

    return await getAppVersion(appId, 'latest');
}

async function downloadIcon(appStoreId, version) {
    const iconUrl = `${await getApiServerOrigin()}/api/v1/apps/${appStoreId}/versions/${version}/icon`;

    return await promiseRetry({ times: 10, interval: 5000, debug }, async function () {
        const [networkError, response] = await safe(superagent.get(iconUrl)
            .buffer(true)
            .timeout(60 * 1000)
            .ok(() => true));

        if (networkError) throw new BoxError(BoxError.NETWORK_ERROR, `Network error downloading icon : ${networkError.message}`);
        if (response.status !== 200) return; // ignore error. this can also happen for apps installed with cloudron-cli

        return response.body;
    });
}