import fs from 'fs';
import path from 'path';
import {fileURLToPath} from 'url';

import Discord from 'discord.js';
import sequelize from 'sequelize';
import AwnAPI from './utils/awn-api.js';
import ConfigTools from './utils/config-tools.js';

import Logger from 'core/logger';

import SquadServer from './index.js';
import Plugins from './plugins/index.js';

const { Sequelize } = sequelize;

const __dirname = path.dirname(fileURLToPath(import.meta.url));

export default class SquadServerFactory {
  static async buildFromConfig(config) {
    Logger.verbose('SquadServerFactory', 4, `Logging config:\n${JSON.stringify(config)}`);
    Logger.setTimeStamps(config.logger.timestamps ? config.logger.timestamps : false);

    const plugins = await Plugins.getPlugins();

    for (const plugin of Object.keys(plugins)) {
      Logger.setColor(plugin, 'magentaBright');
    }

    // setup logging levels
    for (const [module, verboseness] of Object.entries(config.logger.verboseness)) {
      Logger.setVerboseness(module, verboseness);
    }

    for (const [module, color] of Object.entries(config.logger.colors)) {
      Logger.setColor(module, color);
    }

    // create SquadServer
    Logger.verbose('SquadServerFactory', 1, 'Creating SquadServer...');
    const server = new SquadServer(config.server);

    // initialise connectors
    Logger.verbose('SquadServerFactory', 1, 'Preparing connectors...');
    const connectors = {};
    for (const pluginConfig of config.plugins) {
      if (!pluginConfig.enabled) continue;

      if (!plugins[pluginConfig.plugin])
        throw new Error(`Plugin ${pluginConfig.plugin} does not exist.`);

      const Plugin = plugins[pluginConfig.plugin];

      for (const [optionName, option] of Object.entries(Plugin.optionsSpecification)) {
        // ignore non connectors
        if (!option.connector) continue;

        // check the connector is listed in the options
        if (!(optionName in pluginConfig))
          throw new Error(
            `${Plugin.name}: ${optionName} (${option.connector} connector) is missing.`
          );

        // get the name of the connector
        const connectorName = pluginConfig[optionName];

        // skip already created connectors
        if (connectors[connectorName]) continue;

        // create the connector
        connectors[connectorName] = await SquadServerFactory.createConnector(
          server,
          option.connector,
          connectorName,
          config.connectors[connectorName]
        );
      }
    }

    // initialise plugins
    Logger.verbose('SquadServerFactory', 1, 'Initialising plugins...');

    for (const pluginConfig of config.plugins) {
      if (!pluginConfig.enabled) continue;

      if (!plugins[pluginConfig.plugin])
        throw new Error(`Plugin ${pluginConfig.plugin} does not exist.`);

      const Plugin = plugins[pluginConfig.plugin];

      Logger.verbose('SquadServerFactory', 1, `Initialising ${Plugin.name}...`);

      const plugin = new Plugin(server, pluginConfig, connectors);

      // allow the plugin to do any asynchronous work needed before it can be mounted
      await plugin.prepareToMount();

      server.plugins.push(plugin);
    }

    return server;
  }

  static async createConnector(server, type, connectorName, connectorConfig) {
    Logger.verbose('SquadServerFactory', 1, `Starting ${type} connector ${connectorName}...`);

    if (type === 'discord') {
      Logger.verbose('SquadServerFactory', 1, `Connector is Discord Type`);
      const connector = new Discord.Client();
      Logger.verbose('SquadServerFactory', 1, `Connector created Discord client`);
      await connector.login(connectorConfig);
      Logger.verbose('SquadServerFactory', 1, `Connector Logged into Discord`);
      return connector;
    }

    if (type === 'sequelize') {
      Logger.verbose('SquadServerFactory', 1, `Connector is SQL Type`);
      let connector;

      if (typeof connectorConfig === 'string') {
        connector = new Sequelize(connectorConfig, {
          define: {
            charset: 'utf8mb4',
            collate: 'utf8mb4_unicode_ci'
          },
          logging: (msg) => Logger.verbose('Sequelize', 3, msg)
        });
      } else if (typeof connectorConfig === 'object') {
        connector = new Sequelize({
          ...connectorConfig,
          logging: (msg) => Logger.verbose('Sequelize', 3, msg)
        });
      } else {
        throw new Error('Unknown sequelize connector config type.');
      }
      Logger.verbose('SquadServerFactory', 1, `Connector created SQL client`);

      await connector.authenticate();
      Logger.verbose('SquadServerFactory', 1, `Connector Logged into SQL`);
      return connector;
    }

    if (type === 'awnAPI') {
      const awn = new AwnAPI(connectorConfig);
      await awn.auth(connectorConfig);
      return awn;
    }

    throw new Error(`${type.connector} is an unsupported connector type.`);
  }

  static parseConfig(configString, configfile = "", previousconfigfiles = null) {
    configfile = path.resolve(configfile);
    if (!previousconfigfiles) previousconfigfiles = []
    if (previousconfigfiles.indexOf(configfile) > -1){
      Logger.verbose('SquadServerFactory', 1, `Found circular config with ${previousconfigfiles.slice(1)}`);
      throw new Error(`Config has circular dependency at ${configfile} in with previous configs ${previousconfigfiles}!`);
    }
    else previousconfigfiles.push(configfile)
    try {
      const jsonconfig = JSON.parse(configString);
      const beforeincludes = jsonconfig.baseincludes ? jsonconfig.baseincludes.flatMap((filename) => {
        try {
          return SquadServerFactory.parseConfig(
              SquadServerFactory.readConfigFile(
                  filename,
                  path.dirname(configfile)
              ),
              filename,
              previousconfigfiles
          );
        } catch (err) {
          throw new Error(`Config file ${filename} from ${configfile} did not load. ${err}`)
        }
      }) : [];
      const overwrites = jsonconfig.overwrites ? jsonconfig.overwrites.flatMap((filename) => SquadServerFactory.parseConfig(SquadServerFactory.readConfigFile(filename), filename, previousconfigfiles)) : [];
      const retconfig = [beforeincludes, jsonconfig, overwrites].flat(1);
      return retconfig;
    } catch (err) {
      throw new Error(`Unable to parse config file. ${err}`);
    }
  }

  static buildFromConfigString(configString) {
    Logger.verbose('SquadServerFactory', 1, 'Parsing config string...');
    return SquadServerFactory.buildFromConfig(SquadServerFactory.parseConfig(configString));
  }

  static readConfigFile(configPath = './config.json', dirlocation = null) {
    const configLoc = dirlocation ? path.resolve(__dirname, '../', dirlocation, configPath) : path.resolve(__dirname, '../', configPath);
    if (!fs.existsSync(configLoc)) throw new Error(`Config file does not exist. ${configLoc}`);

    Logger.verbose('SquadServerFactory', 1, `Reading config file ${configLoc}`);
    return fs.readFileSync(configLoc, 'utf8');
  }

  static buildFromConfigFile(configPath) {
    Logger.verbose('SquadServerFactory', 1, 'Reading config file...');
    Logger.verbose('SquadServerFactory', 4, JSON.stringify(configPath));
    let configs = SquadServerFactory.parseConfig(SquadServerFactory.readConfigFile(configPath));

    const mergedconfig = ConfigTools.mergeConfigs({}, ...configs);
    Logger.verbose('SquadServerFactory', 4, `Merged config: ${JSON.stringify(mergedconfig)}`)
    return SquadServerFactory.buildFromConfig(mergedconfig);
  }

  static async buildConfig() {
    const plugins = await Plugins.getPlugins();

    const templatePath = path.resolve(__dirname, './templates/config-template.json');
    const templateString = fs.readFileSync(templatePath, 'utf8');
    const template = SquadServerFactory.parseConfig(templateString);

    const pluginKeys = Object.keys(plugins).sort((a, b) =>
      a.name < b.name ? -1 : a.name > b.name ? 1 : 0
    );

    for (const pluginKey of pluginKeys) {
      const Plugin = plugins[pluginKey];

      const pluginConfig = { plugin: Plugin.name, enabled: Plugin.defaultEnabled };
      for (const [optionName, option] of Object.entries(Plugin.optionsSpecification)) {
        pluginConfig[optionName] = option.default;
      }

      template.plugins.push(pluginConfig);
    }

    return template;
  }

  static async buildConfigFile() {
    const configPath = path.resolve(__dirname, '../config.example.json');
    const config = await SquadServerFactory.buildConfig();

    const configString = JSON.stringify(config, null, 2);
    fs.writeFileSync(configPath, configString);
  }

  static async buildReadmeFile() {
    const plugins = await Plugins.getPlugins();

    const pluginKeys = Object.keys(plugins).sort((a, b) =>
      a.name < b.name ? -1 : a.name > b.name ? 1 : 0
    );

    const pluginInfo = [];

    for (const pluginName of pluginKeys) {
      const Plugin = plugins[pluginName];

      const options = [];
      for (const [optionName, option] of Object.entries(Plugin.optionsSpecification)) {
        let optionInfo = `<li><h4>${optionName}${option.required ? ' (Required)' : ''}</h4>
           <h6>Description</h6>
           <p>${option.description}</p>
           <h6>Default</h6>
           <pre><code>${
             typeof option.default === 'object'
               ? JSON.stringify(option.default, null, 2)
               : option.default
           }</code></pre></li>`;

        if (option.example)
          optionInfo += `<h6>Example</h6>
           <pre><code>${
             typeof option.example === 'object'
               ? JSON.stringify(option.example, null, 2)
               : option.example
           }</code></pre>`;

        options.push(optionInfo);
      }

      pluginInfo.push(
        `<details>
          <summary>${Plugin.name}</summary>
          <h2>${Plugin.name}</h2>
          <p>${Plugin.description}</p>
          <h3>Options</h3>
          <ul>${options.join('\n')}</ul>
        </details>`
      );
    }

    const pluginInfoText = pluginInfo.join('\n\n');

    const templatePath = path.resolve(__dirname, './templates/readme-template.md');
    const template = fs.readFileSync(templatePath, 'utf8');

    const readmePath = path.resolve(__dirname, '../README.md');
    const readme = template.replace(/\/\/PLUGIN-INFO\/\//, pluginInfoText);

    fs.writeFileSync(readmePath, readme);
  }
}