import { Logger } from '../common/logger';

export interface IContextMenuAction {
    runContextMenuAction(): void;
    createContextMenuItem(): void;
}

export interface MenuAction {
    id: string;
    title: string;
    actionDispatcher: IContextMenuAction;
}

export class ContextMenuBuilder {
    private static instance: ContextMenuBuilder;
    private menuActions: MenuAction[] = [];
    private logger = Logger.getInstance();

    private constructor() {
        this.addEventHandlers();
    }

    public static getInstance(): ContextMenuBuilder {
        if (!this.instance) {
            this.instance = new ContextMenuBuilder();
        }
        return this.instance;
    }

    public addContextMenuAction(itemTitle: string, iContextMenuAction: IContextMenuAction) {
        const menuAction = this.menuActions.find((ma) => ma.id === this.getItemId(itemTitle));
        if (menuAction) {
            this.logger.logWarning('The context menu item [' + itemTitle + '] has already been added!');
            return;
        }
        const menuActionDispatcher: MenuAction = {
            id: chrome.runtime.id + '_' + itemTitle,
            title: itemTitle,
            actionDispatcher: iContextMenuAction
        };
        this.menuActions.push(menuActionDispatcher);

        chrome.contextMenus.create(
            {
                id: menuActionDispatcher.id,
                title: menuActionDispatcher.title,
                contexts: ['launcher']
            },
            function () {
                if (chrome.runtime.lastError)
                    Logger.getInstance().logError('context error:' + chrome.runtime.lastError);
            }
        );
    }

    public removeContextMenuItem(title: string) {
        const menuAction = this.menuActions.find((ma) => ma.id === this.getItemId(title));
        if (menuAction) {
            chrome.contextMenus.remove(menuAction.id);
        }
    }

    private addEventHandlers() {
        chrome.contextMenus.onClicked.addListener((data) => {
            const menuAction = this.menuActions.find((ma) => ma.id === data.menuItemId);
            if (menuAction) {
                menuAction.actionDispatcher.runContextMenuAction();
            }
        });
    }

    private getItemId(title: string): string {
        return chrome.runtime.id + '_' + title;
    }
}