import { ACL } from '@nocobase/acl';
import { registerActions } from '@nocobase/actions';
import Database, { CollectionOptions, IDatabaseOptions } from '@nocobase/database';
import Resourcer, { ResourceOptions } from '@nocobase/resourcer';
import { applyMixins, AsyncEmitter } from '@nocobase/utils';
import { Command, CommandOptions } from 'commander';
import { Server } from 'http';
import { i18n, InitOptions } from 'i18next';
import Koa from 'koa';
import { isBoolean } from 'lodash';
import { createACL } from './acl';
import { createCli } from './commands';
import { createDatabase, createI18n, createResourcer, registerMiddlewares } from './helper';
import { Plugin } from './plugin';
import { PluginManager, InstallOptions } from './plugin-manager';
import { AppManager } from './app-manager';

export type PluginConfiguration = string | [string, any];
export type PluginsConfigurations = Array<PluginConfiguration>;

export interface ResourcerOptions {
  prefix?: string;
}

export interface ApplicationOptions {
  database?: IDatabaseOptions | Database;
  resourcer?: ResourcerOptions;
  bodyParser?: any;
  cors?: any;
  dataWrapping?: boolean;
  registerActions?: boolean;
  i18n?: i18n | InitOptions;
  plugins?: PluginsConfigurations;
}

interface DefaultState {
  currentUser?: any;
  [key: string]: any;
}

interface DefaultContext {
  db: Database;
  resourcer: Resourcer;
  [key: string]: any;
}

interface MiddlewareOptions {
  name?: string;
  resourceName?: string;
  resourceNames?: string[];
  insertBefore?: string;
  insertAfter?: string;
}

interface ActionsOptions {
  resourceName?: string;
  resourceNames?: string[];
}

interface ListenOptions {
  port?: number | undefined;
  host?: string | undefined;
  backlog?: number | undefined;
  path?: string | undefined;
  exclusive?: boolean | undefined;
  readableAll?: boolean | undefined;
  writableAll?: boolean | undefined;
  /**
   * @default false
   */
  ipv6Only?: boolean | undefined;
  signal?: AbortSignal | undefined;
}

interface StartOptions {
  cliArgs?: any[];
  listen?: ListenOptions;
}

export class Application<StateT = DefaultState, ContextT = DefaultContext> extends Koa implements AsyncEmitter {
  public readonly db: Database;

  public readonly resourcer: Resourcer;

  public readonly cli: Command;

  public readonly i18n: i18n;

  public readonly pm: PluginManager;

  public readonly acl: ACL;

  public readonly appManager: AppManager;

  protected plugins = new Map<string, Plugin>();

  public listenServer: Server;

  constructor(public options: ApplicationOptions) {
    super();

    this.acl = createACL();
    this.db = createDatabase(options);
    this.resourcer = createResourcer(options);
    this.cli = createCli(this);
    this.i18n = createI18n(options);

    this.pm = new PluginManager({
      app: this,
    });

    this.appManager = new AppManager(this);

    registerMiddlewares(this, options);

    if (options.registerActions !== false) {
      registerActions(this);
    }

    this.loadPluginConfig(options.plugins || []);
  }

  plugin<O = any>(pluginClass: any, options?: O): Plugin<O> {
    return this.pm.add(pluginClass, options);
  }

  loadPluginConfig(pluginsConfigurations: PluginsConfigurations) {
    for (let pluginConfiguration of pluginsConfigurations) {
      if (typeof pluginConfiguration == 'string') {
        pluginConfiguration = [pluginConfiguration, {}];
      }

      const plugin = PluginManager.resolvePlugin(pluginConfiguration[0]);
      const pluginOptions = pluginConfiguration[1];

      this.plugin(plugin, pluginOptions);
    }
  }

  use<NewStateT = {}, NewContextT = {}>(
    middleware: Koa.Middleware<StateT & NewStateT, ContextT & NewContextT>,
    options?: MiddlewareOptions,
  ) {
    // @ts-ignore
    return super.use(middleware);
  }

  collection(options: CollectionOptions) {
    return this.db.collection(options);
  }

  resource(options: ResourceOptions) {
    return this.resourcer.define(options);
  }

  actions(handlers: any, options?: ActionsOptions) {
    return this.resourcer.registerActions(handlers);
  }

  command(name: string, desc?: string, opts?: CommandOptions): Command {
    return this.cli.command(name, desc, opts);
  }

  findCommand(name: string): Command {
    return (<any>this.cli)._findCommand(name);
  }

  async load() {
    await this.pm.load();
  }

  getPlugin<P extends Plugin>(name: string) {
    return this.pm.get(name) as P;
  }

  async parse(argv = process.argv) {
    await this.load();
    return this.cli.parseAsync(argv);
  }

  async start(options?: StartOptions) {
    // reconnect database
    if (this.db.closed()) {
      await this.db.reconnect();
    }

    await this.emitAsync('beforeStart', this, options);

    if (options?.listen?.port) {
      const listen = () =>
        new Promise((resolve) => {
          const Server = this.listen(options?.listen, () => {
            resolve(Server);
          });
        });

      // @ts-ignore
      this.listenServer = await listen();
    }

    await this.emitAsync('afterStart', this, options);
  }

  listen(...args): Server {
    return this.appManager.listen(...args);
  }

  async stop(options?: any) {
    await this.emitAsync('beforeStop', this, options);

    try {
      // close database connection
      // silent if database already closed
      await this.db.close();
    } catch (e) {
      console.log(e);
    }

    // close http server
    if (this.listenServer) {
      const closeServer = () =>
        new Promise((resolve, reject) => {
          this.listenServer.close((err) => {
            if (err) {
              return reject(err);
            }
            this.listenServer = null;
            resolve(true);
          });
        });

      await closeServer();
    }

    await this.emitAsync('afterStop', this, options);
  }

  async destroy(options?: any) {
    await this.emitAsync('beforeDestroy', this, options);
    await this.stop(options);
    await this.emitAsync('afterDestroy', this, options);
  }

  async install(options?: InstallOptions) {
    await this.emitAsync('beforeInstall', this, options);

    if (options?.clean) {
      await this.db.clean(isBoolean(options.clean) ? { drop: options.clean } : options.clean);
    }

    await this.db.sync(options?.sync);
    await this.pm.install(options);
    await this.emitAsync('afterInstall', this, options);
  }

  emitAsync: (event: string | symbol, ...args: any[]) => Promise<boolean>;
}

applyMixins(Application, [AsyncEmitter]);

export default Application;