/*---------------------------------------------------------------------------------------------
 *  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 'vs/css!./media/activitybarpart';
import nls = require('vs/nls');
import {TPromise} from 'vs/base/common/winjs.base';
import {Builder, $} from 'vs/base/browser/builder';
import {Action} from 'vs/base/common/actions';
import errors = require('vs/base/common/errors');
import {ActionsOrientation, ActionBar, IActionItem} from 'vs/base/browser/ui/actionbar/actionbar';
import {CONTEXT, ToolBar} from 'vs/base/browser/ui/toolbar/toolbar';
import {Registry} from 'vs/platform/platform';
import {IViewlet} from 'vs/workbench/common/viewlet';
import {ViewletDescriptor, ViewletRegistry, Extensions as ViewletExtensions} from 'vs/workbench/browser/viewlet';
import {Part} from 'vs/workbench/browser/part';
import {ActivityAction, ActivityActionItem} from 'vs/workbench/browser/parts/activitybar/activityAction';
import {IViewletService} from 'vs/workbench/services/viewlet/common/viewletService';
import {IActivityService, IBadge} from 'vs/workbench/services/activity/common/activityService';
import {IPartService} from 'vs/workbench/services/part/common/partService';
import {IContextMenuService} from 'vs/platform/contextview/browser/contextView';
import {IInstantiationService} from 'vs/platform/instantiation/common/instantiation';
import {IMessageService} from 'vs/platform/message/common/message';
import {ITelemetryService} from 'vs/platform/telemetry/common/telemetry';
import {IKeybindingService} from 'vs/platform/keybinding/common/keybinding';
import {Scope, IActionBarRegistry, Extensions as ActionBarExtensions, prepareActions} from 'vs/workbench/browser/actionBarRegistry';
import Severity from 'vs/base/common/severity';
import {IAction} from 'vs/base/common/actions';
import events = require('vs/base/common/events');

export class ActivitybarPart extends Part implements IActivityService {
	public _serviceBrand: any;
	private viewletSwitcherBar: ActionBar;
	private globalViewletSwitcherBar: ActionBar;
	private globalToolBar: ToolBar;
	private activityActionItems: { [actionId: string]: IActionItem; };
	private viewletIdToActions: { [viewletId: string]: ActivityAction; };

	constructor(
		id: string,
		@IViewletService private viewletService: IViewletService,
		@IMessageService private messageService: IMessageService,
		@ITelemetryService private telemetryService: ITelemetryService,
		@IContextMenuService private contextMenuService: IContextMenuService,
		@IKeybindingService private keybindingService: IKeybindingService,
		@IInstantiationService private instantiationService: IInstantiationService
	) {
		super(id);

		this.activityActionItems = {};
		this.viewletIdToActions = {};

		this.registerListeners();
	}

	private registerListeners(): void {

		// Activate viewlet action on opening of a viewlet
		this.toUnbind.push(this.viewletService.onDidViewletOpen(viewlet => this.onActiveViewletChanged(viewlet)));

		// Deactivate viewlet action on close
		this.toUnbind.push(this.viewletService.onDidViewletClose(viewlet => this.onViewletClosed(viewlet)));
	}

	private onActiveViewletChanged(viewlet: IViewlet): void {
		if (this.viewletIdToActions[viewlet.getId()]) {
			this.viewletIdToActions[viewlet.getId()].activate();

			// There can only be one active viewlet action
			for (const key in this.viewletIdToActions) {
				if (this.viewletIdToActions.hasOwnProperty(key) && key !== viewlet.getId()) {
					this.viewletIdToActions[key].deactivate();
				}
			}
		}
	}

	private onViewletClosed(viewlet: IViewlet): void {
		if (this.viewletIdToActions[viewlet.getId()]) {
			this.viewletIdToActions[viewlet.getId()].deactivate();
		}
	}

	public showActivity(viewletId: string, badge: IBadge, clazz?: string): void {
		const action = this.viewletIdToActions[viewletId];
		if (action) {
			action.setBadge(badge);
			if (clazz) {
				action.class = clazz;
			}
		}
	}

	public clearActivity(viewletId: string): void {
		this.showActivity(viewletId, null);
	}

	public createContentArea(parent: Builder): Builder {
		const $el = $(parent);
		const $result = $('.content').appendTo($el);

		// Top Actionbar with action items for each viewlet action
		this.createViewletSwitcher($result.clone());

		// Bottom Toolbar with action items for global actions
		this.createGlobalToolBarArea($result.clone()); // not used currently

		return $result;
	}

	private createViewletSwitcher(div: Builder): void {

		// Viewlet switcher is on top
		this.viewletSwitcherBar = new ActionBar(div, {
			actionItemProvider: (action: Action) => this.activityActionItems[action.id],
			orientation: ActionsOrientation.VERTICAL,
			ariaLabel: nls.localize('activityBarAriaLabel', "Active View Switcher")
		});
		this.viewletSwitcherBar.getContainer().addClass('position-top');

		// Global viewlet switcher is right below
		this.globalViewletSwitcherBar = new ActionBar(div, {
			actionItemProvider: (action: Action) => this.activityActionItems[action.id],
			orientation: ActionsOrientation.VERTICAL,
			ariaLabel: nls.localize('globalActivityBarAriaLabel', "Active Global View Switcher")
		});
		this.globalViewletSwitcherBar.getContainer().addClass('position-bottom');

		// Build Viewlet Actions in correct order
		const activeViewlet = this.viewletService.getActiveViewlet();
		const registry = Registry.as<ViewletRegistry>(ViewletExtensions.Viewlets);
		const allViewletActions = registry.getViewlets();
		const actionOptions = { label: true, icon: true };

		const toAction = (viewlet: ViewletDescriptor) => {
			const action = this.instantiationService.createInstance(ViewletActivityAction, viewlet.id + '.activity-bar-action', viewlet);

			let keybinding: string = null;
			const keys = this.keybindingService.lookupKeybindings(viewlet.id).map(k => this.keybindingService.getLabelFor(k));
			if (keys && keys.length) {
				keybinding = keys[0];
			}

			this.activityActionItems[action.id] = new ActivityActionItem(action, viewlet.name, keybinding);
			this.viewletIdToActions[viewlet.id] = action;

			// Mark active viewlet action as active
			if (activeViewlet && activeViewlet.getId() === viewlet.id) {
				action.activate();
			}

			return action;
		};

		// Add to viewlet switcher
		this.viewletSwitcherBar.push(allViewletActions
			.filter(v => !v.isGlobal)
			.sort((v1, v2) => v1.order - v2.order)
			.map(toAction)
			, actionOptions);

		// Add to viewlet switcher
		this.globalViewletSwitcherBar.push(allViewletActions
			.filter(v => v.isGlobal)
			.sort((v1, v2) => v1.order - v2.order)
			.map(toAction),
			actionOptions);
	}

	private createGlobalToolBarArea(div: Builder): void {

		// Global action bar is on the bottom
		this.globalToolBar = new ToolBar(div.getHTMLElement(), this.contextMenuService, {
			actionItemProvider: (action: Action) => this.activityActionItems[action.id],
			orientation: ActionsOrientation.VERTICAL
		});
		this.globalToolBar.getContainer().addClass('global');

		this.globalToolBar.actionRunner.addListener2(events.EventType.RUN, (e: any) => {

			// Check for Error
			if (e.error && !errors.isPromiseCanceledError(e.error)) {
				this.messageService.show(Severity.Error, e.error);
			}

			// Log in telemetry
			if (this.telemetryService) {
				this.telemetryService.publicLog('workbenchActionExecuted', { id: e.action.id, from: 'activityBar' });
			}
		});

		// Build Global Actions in correct order
		const primaryActions = this.getGlobalActions(true);
		const secondaryActions = this.getGlobalActions(false);

		if (primaryActions.length + secondaryActions.length > 0) {
			this.globalToolBar.getContainer().addClass('position-bottom');
		}

		// Add to global action bar
		this.globalToolBar.setActions(prepareActions(primaryActions), prepareActions(secondaryActions))();
	}

	private getGlobalActions(primary: boolean): IAction[] {
		const actionBarRegistry = Registry.as<IActionBarRegistry>(ActionBarExtensions.Actionbar);

		// Collect actions from actionbar contributor
		let actions: IAction[];
		if (primary) {
			actions = actionBarRegistry.getActionBarActionsForContext(Scope.GLOBAL, CONTEXT);
		} else {
			actions = actionBarRegistry.getSecondaryActionBarActionsForContext(Scope.GLOBAL, CONTEXT);
		}

		return actions.map((action: ActivityAction) => {
			if (primary) {
				let keybinding: string = null;
				const keys = this.keybindingService.lookupKeybindings(action.id).map(k => this.keybindingService.getLabelFor(k));
				if (keys && keys.length) {
					keybinding = keys[0];
				}

				let actionItem = actionBarRegistry.getActionItemForContext(Scope.GLOBAL, CONTEXT, action);
				if (!actionItem) {
					actionItem = new ActivityActionItem(action, action.label, keybinding);
				}

				if (actionItem instanceof ActivityActionItem) {
					(<ActivityActionItem>actionItem).keybinding = keybinding;
				}

				this.activityActionItems[action.id] = actionItem;
			}

			return action;
		});
	}

	public dispose(): void {
		if (this.viewletSwitcherBar) {
			this.viewletSwitcherBar.dispose();
			this.viewletSwitcherBar = null;
		}

		if (this.globalToolBar) {
			this.globalToolBar.dispose();
			this.globalToolBar = null;
		}

		super.dispose();
	}
}

class ViewletActivityAction extends ActivityAction {
	private static preventDoubleClickDelay = 300;
	private lastRun: number = 0;

	private viewlet: ViewletDescriptor;

	constructor(
		id: string, viewlet: ViewletDescriptor,
		@IViewletService private viewletService: IViewletService,
		@IPartService private partService: IPartService
	) {
		super(id, viewlet.name, viewlet.cssClass);

		this.viewlet = viewlet;
	}

	public run(): TPromise<any> {

		// prevent accident trigger on a doubleclick (to help nervous people)
		const now = Date.now();
		if (now - this.lastRun < ViewletActivityAction.preventDoubleClickDelay) {
			return TPromise.as(true);
		}
		this.lastRun = now;

		const sideBarHidden = this.partService.isSideBarHidden();
		const activeViewlet = this.viewletService.getActiveViewlet();

		// Hide sidebar if selected viewlet already visible
		if (!sideBarHidden && activeViewlet && activeViewlet.getId() === this.viewlet.id) {
			this.partService.setSideBarHidden(true);
		}

		// Open viewlet and focus it
		else {
			this.viewletService.openViewlet(this.viewlet.id, true).done(null, errors.onUnexpectedError);
			this.activate();
		}

		return TPromise.as(true);
	}
}