/*
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.
*/

/*
    this file is found by cordova-lib when you attempt to
    'cordova platform add PATH' where path is this repo.
*/
const path = require('path');
const fs = require('fs-extra');
const {
    ActionStack,
    ConfigChanges: { PlatformMunger },
    CordovaError,
    CordovaLogger,
    events: selfEvents,
    PlatformJson,
    PluginInfoProvider
} = require('cordova-common');
const Parser = require('./parser');

function setupEvents (externalEventEmitter) {
    if (externalEventEmitter) {
        // This will make the platform internal events visible outside
        selfEvents.forwardEventsTo(externalEventEmitter);
        return externalEventEmitter;
    }

    // There is no logger if external emitter is not present,
    // so attach a console logger
    CordovaLogger.get().subscribe(selfEvents);
    return selfEvents;
}

class Api {
    constructor (platform, platformRootDir, events) {
        this.platform = 'electron';

        // MyApp/platforms/electron
        this.root = platformRootDir || path.resolve(__dirname, '../bin/templates');
        this.events = setupEvents(events);
        this.parser = new Parser(this.root);
        this.handler = require('./handler');

        this.locations = {
            platformRootDir,
            root: this.root,
            www: path.join(this.root, 'www'),
            res: path.join(this.root, 'res'),
            platformWww: path.join(this.root, 'platform_www'),
            configXml: path.join(this.root, 'config.xml'),
            defaultConfigXml: path.join(this.root, 'cordova/defaults.xml'),
            build: path.join(this.root, 'build'),
            buildRes: path.join(this.root, 'build-res'),
            cache: path.join(this.root, 'cache'),
            // NOTE: Due to platformApi spec we need to return relative paths here
            cordovaJs: 'bin/templates/project/assets/www/cordova.js',
            cordovaJsSrc: 'cordova-js-src'
        };

        this._platformJson = PlatformJson.load(this.root, this.platform);
        this._pluginInfoProvider = new PluginInfoProvider();
        this._munger = new PlatformMunger(this.platform, this.root, this._platformJson, this._pluginInfoProvider);
    }

    getPlatformInfo () {
        return {
            locations: this.locations,
            root: this.root,
            name: this.platform,
            version: Api.version(),
            projectConfig: this.config
        };
    }

    prepare (cordovaProject, options) {
        return require('./prepare').prepare.call(this, cordovaProject, options);
    }

    addPlugin (pluginInfo, installOptions) {
        if (!pluginInfo) {
            return Promise.reject(new Error('Missing plugin info parameter. The first parameter should contain a valid PluginInfo instance.'));
        }

        installOptions = installOptions || {};
        installOptions.variables = installOptions.variables || {};
        // CB-10108 platformVersion option is required for proper plugin installation
        installOptions.platformVersion = installOptions.platformVersion ||
            this.getPlatformInfo().version;

        const actions = new ActionStack();

        let platform = this.platform;
        if (!pluginInfo.getPlatformsArray().includes(platform)) { // if `cordova-electron` is not defined in plugin.xml, `browser` is used instead.
            platform = 'browser';
        }

        // gather all files needs to be handled during install
        pluginInfo.getFilesAndFrameworks(platform)
            .concat(pluginInfo.getAssets(platform))
            .concat(pluginInfo.getJsModules(platform))
            .forEach((item) => {
                actions.push(actions.createAction(
                    this._getInstaller(item.itemType),
                    [item, pluginInfo.dir, pluginInfo.id, installOptions],
                    this._getUninstaller(item.itemType),
                    [item, pluginInfo.dir, pluginInfo.id, installOptions]));
            });

        // run through the action stack
        return actions.process(platform, this.root)
            .then(() => {
                // Add PACKAGE_NAME variable into vars
                if (!installOptions.variables.PACKAGE_NAME) {
                    installOptions.variables.PACKAGE_NAME = this.handler.package_name(this.root);
                }

                this._munger
                    // Ignore passed `is_top_level` option since platform itself doesn't know
                    // anything about managing dependencies - it's responsibility of caller.
                    .add_plugin_changes(pluginInfo, installOptions.variables, /* is_top_level= */true, /* should_increment= */true)
                    .save_all();

                const targetDir = installOptions.usePlatformWww ? this.getPlatformInfo().locations.platformWww : this.getPlatformInfo().locations.www;

                this._addModulesInfo(platform, pluginInfo, targetDir);
            });
    }

    removePlugin (pluginInfo, uninstallOptions) {
        if (!pluginInfo) {
            return Promise.reject(new Error('Missing plugin info parameter. The first parameter should contain a valid PluginInfo instance.'));
        }

        uninstallOptions = uninstallOptions || {};
        // CB-10108 platformVersion option is required for proper plugin installation
        uninstallOptions.platformVersion = uninstallOptions.platformVersion || this.getPlatformInfo().version;

        const actions = new ActionStack();

        let platform = this.platform;
        if (!pluginInfo.getPlatformsArray().includes(platform)) { // if `cordova-electron` is not defined in plugin.xml, `browser` is used instead.
            platform = 'browser';
        }

        // queue up plugin files
        pluginInfo.getFilesAndFrameworks(platform)
            .concat(pluginInfo.getAssets(platform))
            .concat(pluginInfo.getJsModules(platform))
            .forEach((item) => {
                actions.push(actions.createAction(
                    this._getUninstaller(item.itemType), [item, pluginInfo.dir, pluginInfo.id, uninstallOptions],
                    this._getInstaller(item.itemType), [item, pluginInfo.dir, pluginInfo.id, uninstallOptions]));
            });

        // run through the action stack
        return actions.process(platform, this.root)
            .then(() => {
                this._munger
                    // Ignore passed `is_top_level` option since platform itself doesn't know
                    // anything about managing dependencies - it's responsibility of caller.
                    .remove_plugin_changes(pluginInfo, /* is_top_level= */true)
                    .save_all();

                const targetDir = uninstallOptions.usePlatformWww
                    ? this.getPlatformInfo().locations.platformWww
                    : this.getPlatformInfo().locations.www;

                this._removeModulesInfo(pluginInfo, targetDir);
                // Remove stale plugin directory
                // @todo this should be done by plugin files uninstaller
                fs.removeSync(path.resolve(this.root, 'Plugins', pluginInfo.id));
            });
    }

    _getInstaller (type) {
        return (item, plugin_dir, plugin_id, options, project) => {
            const installer = this.handler[type];

            if (!installer) {
                this.events.emit('warn', `Unrecognized type "${type}"`);
            } else {
                const wwwDest = options.usePlatformWww
                    ? this.getPlatformInfo().locations.platformWww
                    : this.handler.www_dir(this.root);
                if (type === 'asset') {
                    installer.install(item, plugin_dir, wwwDest);
                } else if (type === 'js-module') {
                    installer.install(item, plugin_dir, plugin_id, wwwDest);
                } else {
                    installer.install(item, plugin_dir, this.root, plugin_id, options, project);
                }
            }
        };
    }

    _getUninstaller (type) {
        return (item, plugin_dir, plugin_id, options, project) => {
            const installer = this.handler[type];

            if (!installer) {
                this.events.emit('warn', `electron plugin uninstall: unrecognized type, skipping : ${type}`);
            } else {
                const wwwDest = options.usePlatformWww
                    ? this.getPlatformInfo().locations.platformWww
                    : this.handler.www_dir(this.root);

                if (['asset', 'js-module'].indexOf(type) > -1) {
                    return installer.uninstall(item, wwwDest, plugin_id);
                } else {
                    return installer.uninstall(item, this.root, plugin_id, options, project);
                }
            }
        };
    }

    /**
     * Removes the specified modules from list of installed modules and updates
     *   platform_json and cordova_plugins.js on disk.
     *
     * @param   {PluginInfo}  plugin  PluginInfo instance for plugin, which modules
     *   needs to be added.
     * @param   {String}  targetDir  The directory, where updated cordova_plugins.js
     *   should be written to.
     */
    _addModulesInfo (platform, plugin, targetDir) {
        const installedModules = this._platformJson.root.modules || [];

        const installedPaths = installedModules.map((installedModule) => installedModule.file);

        const modulesToInstall = plugin.getJsModules(platform)
            .filter((moduleToInstall) => installedPaths.indexOf(moduleToInstall.file) === -1)
            .map((moduleToInstall) => {
                const moduleName = `${plugin.id}.${moduleToInstall.name || moduleToInstall.src.match(/([^\/]+)\.js/)[1]}`;
                const obj = {
                    file: ['plugins', plugin.id, moduleToInstall.src].join('/'),
                    id: moduleName,
                    pluginId: plugin.id
                };

                if (moduleToInstall.clobbers.length > 0) {
                    obj.clobbers = moduleToInstall.clobbers.map((o) => o.target);
                }

                if (moduleToInstall.merges.length > 0) {
                    obj.merges = moduleToInstall.merges.map((o) => o.target);
                }

                if (moduleToInstall.runs) {
                    obj.runs = true;
                }

                return obj;
            });

        this._platformJson.root.modules = installedModules.concat(modulesToInstall);
        if (!this._platformJson.root.plugin_metadata) {
            this._platformJson.root.plugin_metadata = {};
        }

        this._platformJson.root.plugin_metadata[plugin.id] = plugin.version;
        this._writePluginModules(targetDir);
        this._platformJson.save();
    }

    /**
     * Fetches all installed modules, generates cordova_plugins contents and writes
     *   it to file.
     *
     * @param   {String}  targetDir  Directory, where write cordova_plugins.js to.
     *   Ususally it is either <platform>/www or <platform>/platform_www
     *   directories.
     */
    _writePluginModules (targetDir) {
        // Write out moduleObjects as JSON wrapped in a cordova module to cordova_plugins.js
        const final_contents = `cordova.define('cordova/plugin_list', function (require, exports, module) {
            module.exports = ${JSON.stringify(this._platformJson.root.modules, null, '    ')};

            module.exports.metadata =
            // TOP OF METADATA
            ${JSON.stringify(this._platformJson.root.plugin_metadata || {}, null, '    ')}
            // BOTTOM OF METADATA
        });`;

        fs.ensureDirSync(targetDir);
        fs.writeFileSync(path.join(targetDir, 'cordova_plugins.js'), final_contents, 'utf-8');
    }

    /**
     * Removes the specified modules from list of installed modules and updates
     *   platform_json and cordova_plugins.js on disk.
     *
     * @param   {PluginInfo}  plugin  PluginInfo instance for plugin, which modules
     *   needs to be removed.
     * @param   {String}  targetDir  The directory, where updated cordova_plugins.js
     *   should be written to.
     */
    _removeModulesInfo (plugin, targetDir) {
        const installedModules = this._platformJson.root.modules || [];
        const modulesToRemove = plugin.getJsModules(this.platform)
            .map((jsModule) => ['plugins', plugin.id, jsModule.src].join('/')); /* eslint no-useless-escape : 0 */

        const updatedModules = installedModules
            .filter((installedModule) => modulesToRemove.indexOf(installedModule.file) === -1);

        this._platformJson.root.modules = updatedModules;

        if (this._platformJson.root.plugin_metadata) {
            delete this._platformJson.root.plugin_metadata[plugin.id];
        }

        this._writePluginModules(targetDir);
        this._platformJson.save();
    }

    build (buildOptions) {
        return require('./build').run.call(this, buildOptions, this);
    }

    run (runOptions) {
        return require('./run').run(runOptions);
    }

    clean (cleanOptions) {
        return require('./clean').run(cleanOptions);
    }

    requirements () {
        return require('./check_reqs').run();
    }

    static version () {
        let platformPkg = null;

        try {
            // coming from user project
            platformPkg = require(require.resolve('cordova-electron/package.json'));
        } catch (e) {
            // coming from repo test & coho
            platformPkg = require('../package.json');
        }

        return platformPkg.version;
    }
}
// @todo create projectInstance and fulfill promise with it.
Api.updatePlatform = () => Promise.resolve();

Api.createPlatform = (dest, config, options, events) => {
    if (!config) throw new CordovaError('An Electron platform can not be created with a missing config argument.');

    events = setupEvents(events);

    const name = config.name();
    const id = config.packageName();

    try {
        // we create the project using our scripts in this platform
        return require('./create').createProject(dest, id, name, options).then(() => new Api(null, dest, events));
    } catch (e) {
        events.emit('error', 'createPlatform is not callable from the electron project API.');
    }
};

module.exports = Api;