/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
'use strict';

import { TPromise } from 'vs/base/common/winjs.base';
import Event, { Emitter } from 'vs/base/common/event';

import { MainContext, MainThreadDebugServiceShape, ExtHostDebugServiceShape, DebugSessionUUID, IMainContext } from 'vs/workbench/api/node/extHost.protocol';

import * as vscode from 'vscode';
import URI from 'vs/base/common/uri';


export class ExtHostDebugService implements ExtHostDebugServiceShape {

	private _debugServiceProxy: MainThreadDebugServiceShape;
	private _debugSessions: Map<DebugSessionUUID, ExtHostDebugSession> = new Map<DebugSessionUUID, ExtHostDebugSession>();

	private _onDidStartDebugSession: Emitter<vscode.DebugSession>;
	get onDidStartDebugSession(): Event<vscode.DebugSession> { return this._onDidStartDebugSession.event; }

	private _onDidTerminateDebugSession: Emitter<vscode.DebugSession>;
	get onDidTerminateDebugSession(): Event<vscode.DebugSession> { return this._onDidTerminateDebugSession.event; }

	private _onDidChangeActiveDebugSession: Emitter<vscode.DebugSession | undefined>;
	get onDidChangeActiveDebugSession(): Event<vscode.DebugSession | undefined> { return this._onDidChangeActiveDebugSession.event; }

	private _activeDebugSession: ExtHostDebugSession | undefined;
	get activeDebugSession(): ExtHostDebugSession | undefined { return this._activeDebugSession; }

	private _onDidReceiveDebugSessionCustomEvent: Emitter<vscode.DebugSessionCustomEvent>;
	get onDidReceiveDebugSessionCustomEvent(): Event<vscode.DebugSessionCustomEvent> { return this._onDidReceiveDebugSessionCustomEvent.event; }


	constructor(mainContext: IMainContext) {
		this._onDidStartDebugSession = new Emitter<vscode.DebugSession>();
		this._onDidTerminateDebugSession = new Emitter<vscode.DebugSession>();
		this._onDidChangeActiveDebugSession = new Emitter<vscode.DebugSession>();
		this._onDidReceiveDebugSessionCustomEvent = new Emitter<vscode.DebugSessionCustomEvent>();

		this._debugServiceProxy = mainContext.get(MainContext.MainThreadDebugService);
	}

	public startDebugging(folder: vscode.WorkspaceFolder | undefined, nameOrConfig: string | vscode.DebugConfiguration): TPromise<boolean> {

		return this._debugServiceProxy.$startDebugging(folder ? <URI>folder.uri : undefined, nameOrConfig);
	}

	public startDebugSession(folder: vscode.WorkspaceFolder | undefined, config: vscode.DebugConfiguration): TPromise<vscode.DebugSession> {

		return this._debugServiceProxy.$startDebugSession(folder ? <URI>folder.uri : undefined, config).then((id: DebugSessionUUID) => {
			const debugSession = new ExtHostDebugSession(this._debugServiceProxy, id, config.type, config.name);
			this._debugSessions.set(id, debugSession);
			return debugSession;
		});
	}

	public $acceptDebugSessionStarted(id: DebugSessionUUID, type: string, name: string): void {

		let debugSession = this._debugSessions.get(id);
		if (!debugSession) {
			debugSession = new ExtHostDebugSession(this._debugServiceProxy, id, type, name);
			this._debugSessions.set(id, debugSession);
		}
		this._onDidStartDebugSession.fire(debugSession);
	}

	public $acceptDebugSessionTerminated(id: DebugSessionUUID, type: string, name: string): void {

		let debugSession = this._debugSessions.get(id);
		if (!debugSession) {
			debugSession = new ExtHostDebugSession(this._debugServiceProxy, id, type, name);
			this._debugSessions.set(id, debugSession);
		}
		this._onDidTerminateDebugSession.fire(debugSession);
		this._debugSessions.delete(id);
	}

	public $acceptDebugSessionActiveChanged(id: DebugSessionUUID | undefined, type?: string, name?: string): void {

		if (id) {
			this._activeDebugSession = this._debugSessions.get(id);
			if (!this._activeDebugSession) {
				this._activeDebugSession = new ExtHostDebugSession(this._debugServiceProxy, id, type, name);
				this._debugSessions.set(id, this._activeDebugSession);
			}
		} else {
			this._activeDebugSession = undefined;
		}
		this._onDidChangeActiveDebugSession.fire(this._activeDebugSession);
	}

	public $acceptDebugSessionCustomEvent(id: DebugSessionUUID, type: string, name: string, event: any): void {

		let debugSession = this._debugSessions.get(id);
		if (!debugSession) {
			debugSession = new ExtHostDebugSession(this._debugServiceProxy, id, type, name);
			this._debugSessions.set(id, debugSession);
		}
		const ee: vscode.DebugSessionCustomEvent = {
			session: debugSession,
			event: event.event,
			body: event.body
		};
		this._onDidReceiveDebugSessionCustomEvent.fire(ee);
	}
}

export class ExtHostDebugSession implements vscode.DebugSession {

	private _debugServiceProxy: MainThreadDebugServiceShape;

	private _id: DebugSessionUUID;

	private _type: string;
	private _name: string;

	constructor(proxy: MainThreadDebugServiceShape, id: DebugSessionUUID, type: string, name: string) {
		this._debugServiceProxy = proxy;
		this._id = id;
		this._type = type;
		this._name = name;
	};

	public get id(): string {
		return this._id;
	}

	public get type(): string {
		return this._type;
	}

	public get name(): string {
		return this._name;
	}

	public customRequest(command: string, args: any): Thenable<any> {
		return this._debugServiceProxy.$customDebugAdapterRequest(this._id, command, args);
	}
}