// *****************************************************************************
// Copyright (C) 2018 Red Hat, Inc. 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-only WITH Classpath-exception-2.0
// *****************************************************************************

import { URI } from '@theia/core/shared/vscode-uri';
import CoreURI from '@theia/core/lib/common/uri';
import { interfaces } from '@theia/core/shared/inversify';
import { WindowStateExt, MAIN_RPC_CONTEXT, WindowMain } from '../../common/plugin-api-rpc';
import { RPCProtocol } from '../../common/rpc-protocol';
import { UriComponents } from '../../common/uri-components';
import { Disposable, DisposableCollection } from '@theia/core/lib/common/disposable';
import { open, OpenerService } from '@theia/core/lib/browser/opener-service';
import { ExternalUriService } from '@theia/core/lib/browser/external-uri-service';
import { WindowActivityTracker } from './window-activity-tracker';

export class WindowStateMain implements WindowMain, Disposable {

    private readonly proxy: WindowStateExt;

    private readonly openerService: OpenerService;

    private readonly externalUriService: ExternalUriService;

    private readonly toDispose = new DisposableCollection();

    constructor(rpc: RPCProtocol, container: interfaces.Container) {
        this.proxy = rpc.getProxy(MAIN_RPC_CONTEXT.WINDOW_STATE_EXT);
        this.openerService = container.get(OpenerService);
        this.externalUriService = container.get(ExternalUriService);

        const fireDidFocus = () => this.onFocusChanged(true);
        window.addEventListener('focus', fireDidFocus);
        this.toDispose.push(Disposable.create(() => window.removeEventListener('focus', fireDidFocus)));

        const fireDidBlur = () => this.onFocusChanged(false);
        window.addEventListener('blur', fireDidBlur);
        this.toDispose.push(Disposable.create(() => window.removeEventListener('blur', fireDidBlur)));

       const tracker = new WindowActivityTracker(window);
       this.toDispose.push(tracker.onDidChangeActiveState(isActive => this.onActiveStateChanged(isActive)));
       this.toDispose.push(tracker);
    }

    dispose(): void {
        this.toDispose.dispose();
    }

    private onFocusChanged(focused: boolean): void {
        this.proxy.$onDidChangeWindowFocus(focused);
    }

    private onActiveStateChanged(isActive: boolean): void {
        this.proxy.$onDidChangeWindowActive(isActive);
    }

    async $openUri(uriComponent: UriComponents): Promise<boolean> {
        const uri = URI.revive(uriComponent);
        const url = new CoreURI(encodeURI(uri.toString(true)));
        try {
            await open(this.openerService, url, { openExternalApp: true });
            return true;
        } catch (e) {
            return false;
        }
    }

    async $asExternalUri(uriComponents: UriComponents): Promise<UriComponents> {
        const uri = URI.revive(uriComponents);
        const resolved = await this.externalUriService.resolve(new CoreURI(uri));
        return URI.parse(resolved.toString());
    }

}