/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

'use strict';

const chalk = require('chalk');
const fs = require('fs');
const mkdirp = require('mkdirp');
const inlinedHostConfigs = require('../shared/inlinedHostConfigs');

const configTemplate = fs
 .readFileSync(__dirname + '/config/flowconfig')
 .toString();

function writeConfig(renderer, isFizzSupported) {
 const folder = __dirname + '/' + renderer;
 mkdirp.sync(folder);

 const fizzRenderer = isFizzSupported ? renderer : 'custom';
 const config = configTemplate.replace(
 '%REACT_RENDERER_FLOW_OPTIONS%',
 `
module.name_mapper='react-reconciler/inline.${renderer}$$' -> 'react-reconciler/inline-typed'
module.name_mapper='ReactFiberHostConfig$$' -> 'forks/ReactFiberHostConfig.${renderer}'
module.name_mapper='react-stream/inline.${renderer}$$' -> 'react-stream/inline-typed'
module.name_mapper='ReactFizzHostConfig$$' -> 'forks/ReactFizzHostConfig.${fizzRenderer}'
module.name_mapper='ReactFizzFormatConfig$$' -> 'forks/ReactFizzFormatConfig.${fizzRenderer}'
 `.trim(),
 );

 const disclaimer = `
# ---------------------------------------------------------------#
# NOTE: this file is generated. #
# If you want to edit it, open ./scripts/flow/config/flowconfig. #
# Then run Yarn for changes to take effect. #
# ---------------------------------------------------------------#
 `.trim();

 const configFile = folder + '/.flowconfig';
 let oldConfig;
 try {
 oldConfig = fs.readFileSync(configFile).toString();
 } catch (err) {
 oldConfig = null;
 }
 const newConfig = `
${disclaimer}
${config}
${disclaimer}
`.trim();

 if (newConfig !== oldConfig) {
 fs.writeFileSync(configFile, newConfig);
 console.log(chalk.dim('Wrote a Flow config to ' + configFile));
 }
}

// Write multiple configs in different folders
// so that we can run those checks in parallel if we want.
inlinedHostConfigs.forEach(rendererInfo => {
 if (rendererInfo.isFlowTyped) {
 writeConfig(rendererInfo.shortName, rendererInfo.isFizzSupported);
 }
});