'use strict';

const { publicFolder } = require('unleash-frontend');
const { defaultLogProvider, validateLogProvider } = require('./logger');
const fs = require('fs');

const isDev = () => process.env.NODE_ENV === 'development';
const THIRTY_DAYS = 30 * 24 * 60 * 60 * 1000;

function defaultOptions() {
    return {
        databaseUrl: defaultDatabaseUrl(),
        databaseSchema: 'public',
        port: process.env.HTTP_PORT || process.env.PORT || 4242,
        host: process.env.HTTP_HOST,
        pipe: undefined,
        baseUriPath: process.env.BASE_URI_PATH || '',
        serverMetrics: true,
        enableLegacyRoutes: true,
        extendedPermissions: false,
        publicFolder,
        enableRequestLogger: isDev(),
        secret: 'UNLEASH-SECRET',
        sessionAge: THIRTY_DAYS,
        adminAuthentication: 'unsecure',
        ui: {},
        importFile: undefined,
        dropBeforeImport: false,
        getLogger: defaultLogProvider,
        customContextFields: [],
        disableDBMigration: false,
    };
}

function defaultDatabaseUrl() {
    if (process.env.DATABASE_URL_FILE) {
        return fs.readFileSync(process.env.DATABASE_URL_FILE, 'utf8');
    } else if (process.env.DATABASE_URL) {
        return process.env.DATABASE_URL;
    } else if (isDev() || process.env.DATABASE_HOST) {
        const dbUsername = process.env.DATABASE_USERNAME || 'unleash_user';
        const dbPassword = process.env.DATABASE_PASSWORD || 'passord';
        const dbHost = process.env.DATABASE_HOST || 'localhost';
        const dbPort = process.env.DATABASE_PORT || 5432;
        const dbName = process.env.DATABASE_NAME || 'unleash';
        const sslSupport = process.env.DATABASE_SSL || 'true';
        return `postgres://${dbUsername}:${dbPassword}@${dbHost}:${dbPort}/${dbName}?ssl=${sslSupport}`;
    } else {
        return undefined;
    }
}

module.exports = {
    createOptions: opts => {
        const options = Object.assign({}, defaultOptions(), opts);

        if (!options.databaseUrl) {
            throw new Error(
                'You must either pass databaseUrl option or set environemnt variable DATABASE_URL || (DATABASE_HOST, DATABASE_PORT, DATABASE_USERNAME, DATABASE_PASSWORD, DATABASE_NAME)'
            );
        }

        options.listen = options.pipe
            ? { path: options.pipe }
            : { port: options.port, host: options.host };

        validateLogProvider(options.getLogger);

        return options;
    },
};