// *****************************************************************************
// 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 * as theia from '@theia/plugin';
import { OutputChannelRegistryMain, PluginInfo } from '../../common/plugin-api-rpc';

export class OutputChannelImpl implements theia.OutputChannel {

    private disposed: boolean;

    constructor(readonly name: string, protected readonly proxy: OutputChannelRegistryMain, protected readonly pluginInfo: PluginInfo) {
        // Bind methods to preserve 'this' context when passed as callbacks
        // This ensures compatibility with extensions that pass these methods as function references
        this.append = this.append.bind(this);
        this.appendLine = this.appendLine.bind(this);
        this.replace = this.replace.bind(this);
        this.clear = this.clear.bind(this);
        this.show = this.show.bind(this);
        this.hide = this.hide.bind(this);
    }

    dispose(): void {
        if (!this.disposed) {
            this.proxy.$dispose(this.name).then(() => {
                this.disposed = true;
            });
        }
    }

    append(value: string): void {
        this.validate();
        this.proxy.$append(this.name, value, this.pluginInfo);
    }

    appendLine(value: string): void {
        this.validate();
        this.append(value + '\n');
    }

    replace(value: string): void {
        this.validate();
        this.clear();
        this.append(value);
    }

    clear(): void {
        this.validate();
        this.proxy.$clear(this.name);
    }

    show(preserveFocusOrColumn?: boolean | theia.ViewColumn, preserveFocus?: boolean): void {
        this.validate();
        if (typeof preserveFocusOrColumn === 'boolean') {
            preserveFocus = preserveFocusOrColumn;
        }
        this.proxy.$reveal(this.name, !!preserveFocus);
    }

    hide(): void {
        this.validate();
        this.proxy.$close(this.name);
    }

    protected validate(): void {
        if (this.disposed) {
            throw new Error('Channel has been closed');
        }
    }
}