import * as _ from 'lodash';
import { CommandsObserver } from '../events/CommandsObserver';
import { NativeCommandsSender } from '../adapters/NativeCommandsSender';
import { UniqueIdProvider } from '../adapters/UniqueIdProvider';
import { Options } from '../interfaces/Options';
import { Layout, LayoutRoot } from '../interfaces/Layout';
import { LayoutTreeParser } from './LayoutTreeParser';
import { LayoutTreeCrawler } from './LayoutTreeCrawler';
import { OptionsProcessor } from './OptionsProcessor';

export class Commands {
  constructor(
    private readonly nativeCommandsSender: NativeCommandsSender,
    private readonly layoutTreeParser: LayoutTreeParser,
    private readonly layoutTreeCrawler: LayoutTreeCrawler,
    private readonly commandsObserver: CommandsObserver,
    private readonly uniqueIdProvider: UniqueIdProvider,
    private readonly optionsProcessor: OptionsProcessor
  ) {}

  public setRoot(simpleApi: LayoutRoot) {
    const input = _.cloneDeep(simpleApi);
    const root = this.layoutTreeParser.parse(input.root);
    this.layoutTreeCrawler.crawl(root);

    const modals = _.map(input.modals, (modal) => {
      const modalLayout = this.layoutTreeParser.parse(modal);
      this.layoutTreeCrawler.crawl(modalLayout);
      return modalLayout;
    });

    const overlays = _.map(input.overlays, (overlay) => {
      const overlayLayout = this.layoutTreeParser.parse(overlay);
      this.layoutTreeCrawler.crawl(overlayLayout);
      return overlayLayout;
    });

    const commandId = this.uniqueIdProvider.generate('setRoot');
    const result = this.nativeCommandsSender.setRoot(commandId, { root, modals, overlays });
    this.commandsObserver.notify('setRoot', { commandId, layout: { root, modals, overlays } });
    return result;
  }

  public setDefaultOptions(options: Options) {
    const input = _.cloneDeep(options);
    this.optionsProcessor.processOptions(input);

    this.nativeCommandsSender.setDefaultOptions(input);
    this.commandsObserver.notify('setDefaultOptions', { options });
  }

  public mergeOptions(componentId: string, options: Options) {
    const input = _.cloneDeep(options);
    this.optionsProcessor.processOptions(input);

    this.nativeCommandsSender.mergeOptions(componentId, input);
    this.commandsObserver.notify('mergeOptions', { componentId, options });
  }

  public showModal(layout: Layout) {
    const layoutCloned = _.cloneDeep(layout);
    const layoutNode = this.layoutTreeParser.parse(layoutCloned);
    this.layoutTreeCrawler.crawl(layoutNode);

    const commandId = this.uniqueIdProvider.generate('showModal');
    const result = this.nativeCommandsSender.showModal(commandId, layoutNode);
    this.commandsObserver.notify('showModal', { commandId, layout: layoutNode });
    return result;
  }

  public dismissModal(componentId: string, mergeOptions?: Options) {
    const commandId = this.uniqueIdProvider.generate('dismissModal');
    const result = this.nativeCommandsSender.dismissModal(commandId, componentId, mergeOptions);
    this.commandsObserver.notify('dismissModal', { commandId, componentId, mergeOptions});
    return result;
  }

  public dismissAllModals(mergeOptions?: Options) {
    const commandId = this.uniqueIdProvider.generate('dismissAllModals');
    const result = this.nativeCommandsSender.dismissAllModals(commandId, mergeOptions);
    this.commandsObserver.notify('dismissAllModals', { commandId, mergeOptions });
    return result;
  }

  public push(componentId: string, simpleApi: Layout) {
    const input = _.cloneDeep(simpleApi);

    const layout = this.layoutTreeParser.parse(input);
    this.layoutTreeCrawler.crawl(layout);

    const commandId = this.uniqueIdProvider.generate('push');
    const result = this.nativeCommandsSender.push(commandId, componentId, layout);
    this.commandsObserver.notify('push', { commandId, componentId, layout });
    return result;
  }

  public pop(componentId: string, mergeOptions?: Options) {
    const commandId = this.uniqueIdProvider.generate('pop');
    const result = this.nativeCommandsSender.pop(commandId, componentId, mergeOptions);
    this.commandsObserver.notify('pop', { commandId, componentId, mergeOptions });
    return result;
  }

  public popTo(componentId: string, mergeOptions?: Options) {
    const commandId = this.uniqueIdProvider.generate('popTo');
    const result = this.nativeCommandsSender.popTo(commandId, componentId, mergeOptions);
    this.commandsObserver.notify('popTo', { commandId, componentId, mergeOptions });
    return result;
  }

  public popToRoot(componentId: string, mergeOptions?: Options) {
    const commandId = this.uniqueIdProvider.generate('popToRoot');
    const result = this.nativeCommandsSender.popToRoot(commandId, componentId, mergeOptions);
    this.commandsObserver.notify('popToRoot', { commandId, componentId, mergeOptions });
    return result;
  }

  public setStackRoot(componentId: string, children: Layout[]) {
    const input = _.map(_.cloneDeep(children), (simpleApi) => {
      const layout = this.layoutTreeParser.parse(simpleApi);
      this.layoutTreeCrawler.crawl(layout);
      return layout;
    });
    const commandId = this.uniqueIdProvider.generate('setStackRoot');
    const result = this.nativeCommandsSender.setStackRoot(commandId, componentId, input);
    this.commandsObserver.notify('setStackRoot', { commandId, componentId, layout: input });
    return result;
  }

  public showOverlay(simpleApi: Layout) {
    const input = _.cloneDeep(simpleApi);

    const layout = this.layoutTreeParser.parse(input);
    this.layoutTreeCrawler.crawl(layout);

    const commandId = this.uniqueIdProvider.generate('showOverlay');
    const result = this.nativeCommandsSender.showOverlay(commandId, layout);
    this.commandsObserver.notify('showOverlay', { commandId, layout });
    return result;
  }

  public dismissOverlay(componentId: string) {
    const commandId = this.uniqueIdProvider.generate('dismissOverlay');
    const result = this.nativeCommandsSender.dismissOverlay(commandId, componentId);
    this.commandsObserver.notify('dismissOverlay', { commandId, componentId });
    return result;
  }

  public getLaunchArgs() {
    const commandId = this.uniqueIdProvider.generate('getLaunchArgs');
    const result = this.nativeCommandsSender.getLaunchArgs(commandId);
    this.commandsObserver.notify('getLaunchArgs', { commandId });
    return result;
  }
}