const { ipcRenderer, ipcMain } = require('electron');

const defaultConfig = require('./defaults');
const { getOptions, setOptions, setMenuOptions } = require('./plugins');

const { sendToFront } = require('../providers/app-controls');

const activePlugins = {};
/**
 * [!IMPORTANT!]
 * The method is **sync** in the main process and **async** in the renderer process.
 */
module.exports.getActivePlugins
  = process.type === 'renderer'
  ? async () => ipcRenderer.invoke('get-active-plugins')
  : () => activePlugins;

if (process.type === 'browser') {
  ipcMain.handle('get-active-plugins', this.getActivePlugins);
}

/**
 * [!IMPORTANT!]
 * The method is **sync** in the main process and **async** in the renderer process.
 */
module.exports.isActive
  = process.type === 'renderer'
  ? async (plugin) =>
    plugin in (await ipcRenderer.invoke('get-active-plugins'))
  : (plugin) => plugin in activePlugins;

/**
 * This class is used to create a dynamic synced config for plugins.
 *
 * [!IMPORTANT!]
 * The methods are **sync** in the main process and **async** in the renderer process.
 *
 * @param {string} name - The name of the plugin.
 * @param {boolean} [options.enableFront] - Whether the config should be available in front.js. Default: false.
 * @param {object} [options.initialOptions] - The initial options for the plugin. Default: loaded from store.
 *
 * @example
 * const { PluginConfig } = require("../../config/dynamic");
 * const config = new PluginConfig("plugin-name", { enableFront: true });
 * module.exports = { ...config };
 *
 * // or
 *
 * module.exports = (win, options) => {
 *  const config = new PluginConfig("plugin-name", {
 *    enableFront: true,
 *    initialOptions: options,
 *  });
 *  setupMyPlugin(win, config);
 * };
 */
module.exports.PluginConfig = class PluginConfig {
  #name;
  #config;
  #defaultConfig;
  #enableFront;

  #subscribers = {};
  #allSubscribers = [];

  constructor(name, { enableFront = false, initialOptions = undefined } = {}) {
    const pluginDefaultConfig = defaultConfig.plugins[name] || {};
    const pluginConfig = initialOptions || getOptions(name) || {};

    this.#name = name;
    this.#enableFront = enableFront;
    this.#defaultConfig = pluginDefaultConfig;
    this.#config = { ...pluginDefaultConfig, ...pluginConfig };

    if (this.#enableFront) {
      this.#setupFront();
    }

    activePlugins[name] = this;
  }

  get = (option) => this.#config[option];

  set = (option, value) => {
    this.#config[option] = value;
    this.#onChange(option);
    this.#save();
  };

  toggle = (option) => {
    this.#config[option] = !this.#config[option];
    this.#onChange(option);
    this.#save();
  };

  getAll = () => ({ ...this.#config });

  setAll = (options) => {
    if (!options || typeof options !== 'object') {
      throw new Error('Options must be an object.');
    }

    let changed = false;
    for (const [key, value] of Object.entries(options)) {
      if (this.#config[key] !== value) {
        this.#config[key] = value;
        this.#onChange(key, false);
        changed = true;
      }
    }

    if (changed) {
      for (const fn of this.#allSubscribers) {
        fn(this.#config);
      }
    }

    this.#save();
  };

  getDefaultConfig = () => this.#defaultConfig;

  /**
   * Use this method to set an option and restart the app if `appConfig.restartOnConfigChange === true`
   *
   * Used for options that require a restart to take effect.
   */
  setAndMaybeRestart = (option, value) => {
    this.#config[option] = value;
    setMenuOptions(this.#name, this.#config);
    this.#onChange(option);
  };

  subscribe = (valueName, fn) => {
    this.#subscribers[valueName] = fn;
  };

  subscribeAll = (fn) => {
    this.#allSubscribers.push(fn);
  };

  /** Called only from back */
  #save() {
    setOptions(this.#name, this.#config);
  }

  #onChange(valueName, single = true) {
    this.#subscribers[valueName]?.(this.#config[valueName]);
    if (single) {
      for (const fn of this.#allSubscribers) {
        fn(this.#config);
      }
    }
  }

  #setupFront() {
    const ignoredMethods = ['subscribe', 'subscribeAll'];

    if (process.type === 'renderer') {
      for (const [fnName, fn] of Object.entries(this)) {
        if (typeof fn !== 'function' || fn.name in ignoredMethods) {
          return;
        }

        this[fnName] = async (...args) => await ipcRenderer.invoke(
          `${this.#name}-config-${fnName}`,
          ...args,
        );

        this.subscribe = (valueName, fn) => {
          if (valueName in this.#subscribers) {
            console.error(`Already subscribed to ${valueName}`);
          }

          this.#subscribers[valueName] = fn;
          ipcRenderer.on(
            `${this.#name}-config-changed-${valueName}`,
            (_, value) => {
              fn(value);
            },
          );
          ipcRenderer.send(`${this.#name}-config-subscribe`, valueName);
        };

        this.subscribeAll = (fn) => {
          ipcRenderer.on(`${this.#name}-config-changed`, (_, value) => {
            fn(value);
          });
          ipcRenderer.send(`${this.#name}-config-subscribe-all`);
        };
      }
    } else if (process.type === 'browser') {
      for (const [fnName, fn] of Object.entries(this)) {
        if (typeof fn !== 'function' || fn.name in ignoredMethods) {
          return;
        }

        ipcMain.handle(`${this.#name}-config-${fnName}`, (_, ...args) => fn(...args));
      }

      ipcMain.on(`${this.#name}-config-subscribe`, (_, valueName) => {
        this.subscribe(valueName, (value) => {
          sendToFront(`${this.#name}-config-changed-${valueName}`, value);
        });
      });

      ipcMain.on(`${this.#name}-config-subscribe-all`, () => {
        this.subscribeAll((value) => {
          sendToFront(`${this.#name}-config-changed`, value);
        });
      });
    }
  }
};