/********************************************************************************
 * Copyright (c) 2020-2024 EclipseSource and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/
import { Action, Disposable, DisposableCollection, IActionDispatcher, IActionHandler, MaybeActions, TYPES } from '@eclipse-glsp/sprotty';
import { inject, injectable } from 'inversify';
import { EditorContextService } from '../../base/editor-context-service';
import { IFeedbackActionDispatcher, IFeedbackEmitter } from '../../base/feedback/feedback-action-dispatcher';
import { FeedbackEmitter } from '../../base/feedback/feedback-emitter';
import { EnableToolsAction, Tool } from '../../base/tool-manager/tool';
import { GLSPKeyTool } from '../../base/view/key-tool';
import { GLSPMouseTool } from '../../base/view/mouse-tool';

export interface FeedbackAwareTool extends Tool {
    /**
     * Creates a new feedback emitter helper object. While anything can serve as a feedback emitter,
     * this method ensures that the emitter is stable and does not change between model updates.
     */
    createFeedbackEmitter(): FeedbackEmitter;

    /**
     * Registers `actions` to be sent out as feedback, i.e., changes that are re-established whenever the `GModelRoot`
     * has been set or updated.
     *
     * @param feedbackActions the actions to be sent out.
     * @param feedbackEmitter the emitter sending out feedback actions (this tool by default).
     * @param cleanupActions the actions to be sent out when the feedback is de-registered through the returned Disposable.
     * @returns A 'Disposable' that de-registers the feedback and cleans up any pending feedback with the given `cleanupActions`.
     * @deprecated It is recommended to create a {@link createFeedbackEmitter dedicated emitter} per feedback instead of using the tool.
     */
    registerFeedback(feedbackActions: Action[], feedbackEmitter?: IFeedbackEmitter, cleanupActions?: MaybeActions): Disposable;

    /**
     * De-registers all feedback from the given `feedbackEmitter` (this tool by default) and cleans up any pending feedback with the
     * given `cleanupActions`.
     *
     * @param feedbackEmitter the emitter to be deregistered (this tool by default).
     * @param cleanupActions the actions to be dispatched right after the deregistration to clean up any pending feedback.
     * @deprecated It is recommended to create a {@link createFeedbackEmitter dedicated emitter} per feedback and dispose it like that.
     */
    deregisterFeedback(feedbackEmitter?: IFeedbackEmitter, cleanupActions?: MaybeActions): void;
}

/**
 * A reusable base implementation for {@link Tool}s.
 */
@injectable()
export abstract class BaseTool implements FeedbackAwareTool {
    @inject(TYPES.IFeedbackActionDispatcher) protected feedbackDispatcher: IFeedbackActionDispatcher;
    @inject(TYPES.IActionDispatcher) protected actionDispatcher: IActionDispatcher;
    @inject(GLSPMouseTool) protected mouseTool: GLSPMouseTool;
    @inject(GLSPKeyTool) protected keyTool: GLSPKeyTool;
    @inject(EditorContextService) protected readonly editorContext: EditorContextService;

    protected readonly toDisposeOnDisable = new DisposableCollection();

    abstract enable(): void;

    disable(): void {
        this.toDisposeOnDisable.dispose();
    }

    abstract id: string;

    dispatchActions(actions: Action[]): Promise<void> {
        return this.actionDispatcher.dispatchAll(actions);
    }

    createFeedbackEmitter(): FeedbackEmitter {
        return this.feedbackDispatcher.createEmitter();
    }

    registerFeedback(feedbackActions: Action[], feedbackEmitter: IFeedbackEmitter = this, cleanupActions?: MaybeActions): Disposable {
        return this.feedbackDispatcher.registerFeedback(feedbackEmitter, feedbackActions, cleanupActions);
    }

    deregisterFeedback(feedbackEmitter: IFeedbackEmitter = this, cleanupActions?: MaybeActions): void {
        this.feedbackDispatcher.deregisterFeedback(feedbackEmitter, cleanupActions);
    }
}

/**
 * A reusable base implementation for edit {@link Tool}s.
 */
@injectable()
export abstract class BaseEditTool extends BaseTool {
    get isEditTool(): boolean {
        return true;
    }
}

@injectable()
export abstract class BaseCreationTool<T extends Action> extends BaseEditTool implements IActionHandler {
    protected abstract isTriggerAction: (obj: any) => obj is T;
    protected triggerAction: T;

    handle(action: Action): Action | void {
        if (this.isTriggerAction(action)) {
            this.triggerAction = action;
            return EnableToolsAction.create([this.id]);
        }
    }

    override enable(): void {
        if (this.triggerAction === undefined) {
            throw new TypeError(`Could not enable tool ${this.id}. The triggerAction cannot be undefined.`);
        }
        this.doEnable();
    }

    protected abstract doEnable(): void;
}