import * as PQueue from 'p-queue';
import { inject, injectable } from 'inversify';
import { CommandRegistry } from '@theia/core/lib/common/command';
import { MenuModelRegistry } from '@theia/core/lib/common/menu';
import { Disposable, DisposableCollection } from '@theia/core/lib/common/disposable';
import { BoardsServiceProvider } from './boards-service-provider';
import { Board, ConfigOption, Programmer } from '../../common/protocol';
import { FrontendApplicationContribution } from '@theia/core/lib/browser';
import { BoardsDataStore } from './boards-data-store';
import { MainMenuManager } from '../../common/main-menu-manager';
import { ArduinoMenus, unregisterSubmenu } from '../menu/arduino-menus';

@injectable()
export class BoardsDataMenuUpdater implements FrontendApplicationContribution {

    @inject(CommandRegistry)
    protected readonly commandRegistry: CommandRegistry;

    @inject(MenuModelRegistry)
    protected readonly menuRegistry: MenuModelRegistry;

    @inject(MainMenuManager)
    protected readonly mainMenuManager: MainMenuManager;

    @inject(BoardsDataStore)
    protected readonly boardsDataStore: BoardsDataStore;

    @inject(BoardsServiceProvider)
    protected readonly boardsServiceClient: BoardsServiceProvider;

    protected readonly queue = new PQueue({ autoStart: true, concurrency: 1 });
    protected readonly toDisposeOnBoardChange = new DisposableCollection();

    async onStart(): Promise<void> {
        this.updateMenuActions(this.boardsServiceClient.boardsConfig.selectedBoard);
        this.boardsDataStore.onChanged(() => this.updateMenuActions(this.boardsServiceClient.boardsConfig.selectedBoard));
        this.boardsServiceClient.onBoardsConfigChanged(({ selectedBoard }) => this.updateMenuActions(selectedBoard));
    }

    protected async updateMenuActions(selectedBoard: Board | undefined): Promise<void> {
        return this.queue.add(async () => {
            this.toDisposeOnBoardChange.dispose();
            this.mainMenuManager.update();
            if (selectedBoard) {
                const { fqbn } = selectedBoard;
                if (fqbn) {
                    const { configOptions, programmers, selectedProgrammer } = await this.boardsDataStore.getData(fqbn);
                    if (configOptions.length) {
                        const boardsConfigMenuPath = [...ArduinoMenus.TOOLS__BOARD_SETTINGS_GROUP, 'z01_boardsConfig']; // `z_` is for ordering.
                        for (const { label, option, values } of configOptions.sort(ConfigOption.LABEL_COMPARATOR)) {
                            const menuPath = [...boardsConfigMenuPath, `${option}`];
                            const commands = new Map<string, Disposable & { label: string }>()
                            for (const value of values) {
                                const id = `${fqbn}-${option}--${value.value}`;
                                const command = { id };
                                const selectedValue = value.value;
                                const handler = {
                                    execute: () => this.boardsDataStore.selectConfigOption({ fqbn, option, selectedValue }),
                                    isToggled: () => value.selected
                                };
                                commands.set(id, Object.assign(this.commandRegistry.registerCommand(command, handler), { label: value.label }));
                            }
                            this.menuRegistry.registerSubmenu(menuPath, label);
                            this.toDisposeOnBoardChange.pushAll([
                                ...commands.values(),
                                Disposable.create(() => unregisterSubmenu(menuPath, this.menuRegistry)),
                                ...Array.from(commands.keys()).map((commandId, i) => {
                                    const { label } = commands.get(commandId)!;
                                    this.menuRegistry.registerMenuAction(menuPath, { commandId, order: `${i}`, label });
                                    return Disposable.create(() => this.menuRegistry.unregisterMenuAction(commandId));
                                })
                            ]);
                        }
                    }
                    if (programmers.length) {
                        const programmersMenuPath = [...ArduinoMenus.TOOLS__BOARD_SETTINGS_GROUP, 'z02_programmers'];
                        const label = selectedProgrammer ? `Programmer: "${selectedProgrammer.name}"` : 'Programmer'
                        this.menuRegistry.registerSubmenu(programmersMenuPath, label);
                        this.toDisposeOnBoardChange.push(Disposable.create(() => unregisterSubmenu(programmersMenuPath, this.menuRegistry)));
                        for (const programmer of programmers) {
                            const { id, name } = programmer;
                            const command = { id: `${fqbn}-programmer--${id}` };
                            const handler = {
                                execute: () => this.boardsDataStore.selectProgrammer({ fqbn, selectedProgrammer: programmer }),
                                isToggled: () => Programmer.equals(programmer, selectedProgrammer)
                            };
                            this.menuRegistry.registerMenuAction(programmersMenuPath, { commandId: command.id, label: name });
                            this.commandRegistry.registerCommand(command, handler);
                            this.toDisposeOnBoardChange.pushAll([
                                Disposable.create(() => this.commandRegistry.unregisterCommand(command)),
                                Disposable.create(() => this.menuRegistry.unregisterMenuAction(command.id))
                            ]);
                        }
                    }
                    this.mainMenuManager.update();
                }
            }
        });
    }

}