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

import {TPromise} from 'vs/base/common/winjs.base';
import nls = require('vs/nls');
import {Registry} from 'vs/platform/platform';
import {IDisposable} from 'vs/base/common/lifecycle';
import {Dimension, Builder, $} from 'vs/base/browser/builder';
import events = require('vs/base/common/events');
import strings = require('vs/base/common/strings');
import types = require('vs/base/common/types');
import errors = require('vs/base/common/errors');
import {CONTEXT as ToolBarContext, ToolBar} from 'vs/base/browser/ui/toolbar/toolbar';
import {IActionItem, ActionsOrientation} from 'vs/base/browser/ui/actionbar/actionbar';
import {ProgressBar} from 'vs/base/browser/ui/progressbar/progressbar';
import {Scope, IActionBarRegistry, Extensions, prepareActions} from 'vs/workbench/browser/actionBarRegistry';
import {Action, IAction} from 'vs/base/common/actions';
import {Part} from 'vs/workbench/browser/part';
import {Composite, CompositeDescriptor, CompositeRegistry} from 'vs/workbench/browser/composite';
import {IComposite} from 'vs/workbench/common/composite';
import {EventType as WorkbenchEventType, CompositeEvent} from 'vs/workbench/common/events';
import {EventType as CompositeEventType} from 'vs/workbench/browser/composite';
import {SyncActionDescriptor} from 'vs/platform/actions/common/actions';
import {WorkbenchProgressService} from 'vs/workbench/services/progress/browser/progressService';
import {IPartService} from 'vs/workbench/services/part/common/partService';
import {IStorageService, StorageScope} from 'vs/platform/storage/common/storage';
import {IContextMenuService} from 'vs/platform/contextview/browser/contextView';
import {IEventService} from 'vs/platform/event/common/event';
import {IInstantiationService} from 'vs/platform/instantiation/common/instantiation';
import {IMessageService, Severity} from 'vs/platform/message/common/message';
import {IProgressService} from 'vs/platform/progress/common/progress';
import {ITelemetryService} from 'vs/platform/telemetry/common/telemetry';
import {IKeybindingService} from 'vs/platform/keybinding/common/keybindingService';

export abstract class CompositePart<T extends Composite> extends Part {

	private instantiationService: IInstantiationService;
	private activeCompositeListeners: { (): void; }[];
	private instantiatedCompositeListeners: { (): void; }[];
	private mapCompositeToCompositeContainer: { [compositeId: string]: Builder; };
	private mapActionsBindingToComposite: { [compositeId: string]: () => void; };
	private mapProgressServiceToComposite: { [compositeId: string]: IProgressService; };
	private activeComposite: Composite;
	private lastActiveCompositeId: string;
	private instantiatedComposits: Composite[];
	private titleLabel: Builder;
	private toolBar: ToolBar;
	private compositeLoaderPromises: { [compositeId: string]: TPromise<Composite>; };
	private progressBar: ProgressBar;
	private contentAreaSize: Dimension;
	private telemetryActionsListener: IDisposable;

	constructor(
		private messageService: IMessageService,
		private storageService: IStorageService,
		private eventService: IEventService,
		private telemetryService: ITelemetryService,
		private contextMenuService: IContextMenuService,
		protected partService: IPartService,
		private keybindingService: IKeybindingService,
		private registry: CompositeRegistry<T>,
		private activeCompositeSettingsKey: string,
		id: string
	) {
		super(id);

		this.activeCompositeListeners = [];
		this.instantiatedCompositeListeners = [];
		this.mapCompositeToCompositeContainer = {};
		this.mapActionsBindingToComposite = {};
		this.mapProgressServiceToComposite = {};
		this.activeComposite = null;
		this.instantiatedComposits = [];
		this.compositeLoaderPromises = {};
	}

	public setInstantiationService(service: IInstantiationService): void {
		this.instantiationService = service;
	}

	protected createComposite(id: string, isActive?: boolean): TPromise<Composite> {

		// Check if composite is already created
		for (let i = 0; i < this.instantiatedComposits.length; i++) {
			if (this.instantiatedComposits[i].getId() === id) {
				return TPromise.as(this.instantiatedComposits[i]);
			}
		}

		// Instantiate composite from registry otherwise
		let compositeDescriptor = this.registry.getComposite(id);
		if (compositeDescriptor) {
			let loaderPromise = this.compositeLoaderPromises[id];
			if (!loaderPromise) {
				let progressService = new WorkbenchProgressService(this.eventService, this.progressBar, compositeDescriptor.id, isActive);
				let services = {
					progressService: progressService
				};
				let compositeInstantiationService = this.instantiationService.createChild(services);

				loaderPromise = compositeInstantiationService.createInstance(compositeDescriptor).then((composite: Composite) => {
					this.mapProgressServiceToComposite[composite.getId()] = progressService;

					// Remember as Instantiated
					this.instantiatedComposits.push(composite);

					// Register to title area update events from the composite
					this.instantiatedCompositeListeners.push(composite.addListener(CompositeEventType.INTERNAL_COMPOSITE_TITLE_AREA_UPDATE, (e) => { this.onTitleAreaUpdate(e); }));

					// Remove from Promises Cache since Loaded
					delete this.compositeLoaderPromises[id];

					return composite;
				});

				// Report progress for slow loading composits
				progressService.showWhile(loaderPromise, this.partService.isCreated() ? 800 : 3200 /* less ugly initial startup */);

				// Add to Promise Cache until Loaded
				this.compositeLoaderPromises[id] = loaderPromise;
			}

			return loaderPromise;
		}

		throw new Error(strings.format('Unable to find composite with id {0}', id));
	}

	protected showComposite(composite: Composite): TPromise<void> {

		// Remember Composite
		this.activeComposite = composite;

		// Store in preferences
		this.storageService.store(this.activeCompositeSettingsKey, this.activeComposite.getId(), StorageScope.WORKSPACE);

		// Remember
		this.lastActiveCompositeId = this.activeComposite.getId();

		// Register as Emitter to Workbench Bus
		this.activeCompositeListeners.push(this.eventService.addEmitter(this.activeComposite, this.activeComposite.getId()));

		let createCompositePromise: TPromise<void>;

		// Composits created for the first time
		let compositeContainer = this.mapCompositeToCompositeContainer[composite.getId()];
		if (!compositeContainer) {

			// Build Container off-DOM
			compositeContainer = $().div({
				'class': 'viewlet',
				id: composite.getId()
			}, (div: Builder) => {
				createCompositePromise = composite.create(div);
			});

			// Remember composite container
			this.mapCompositeToCompositeContainer[composite.getId()] = compositeContainer;
		}

		// Composite already exists but is hidden
		else {
			createCompositePromise = TPromise.as(null);
		}

		// Report progress for slow loading composits (but only if we did not create the composits before already)
		let progressService = this.mapProgressServiceToComposite[composite.getId()];
		if (progressService && !compositeContainer) {
			this.mapProgressServiceToComposite[composite.getId()].showWhile(createCompositePromise, this.partService.isCreated() ? 800 : 3200 /* less ugly initial startup */);
		}

		// Fill Content and Actions
		return createCompositePromise.then(() => {

			// Make sure that the user meanwhile did not open another composite or closed the part containing the composite
			if (!this.activeComposite || composite.getId() !== this.activeComposite.getId()) {
				return;
			}

			// Take Composite on-DOM and show
			compositeContainer.build(this.getContentArea());
			compositeContainer.show();

			// Setup action runner
			this.toolBar.actionRunner = composite.getActionRunner();

			// Update title with composite title if it differs from descriptor
			let descriptor = this.registry.getComposite(composite.getId());
			if (descriptor && descriptor.name !== composite.getTitle()) {
				this.updateTitle(composite.getId(), composite.getTitle());
			}

			// Handle Composite Actions
			let actionsBinding = this.mapActionsBindingToComposite[composite.getId()];
			if (!actionsBinding) {
				actionsBinding = this.collectCompositeActions(composite);
				this.mapActionsBindingToComposite[composite.getId()] = actionsBinding;
			}
			actionsBinding();

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

			// Action Run Handling
			this.telemetryActionsListener = this.toolBar.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: 'sideBar' });
				}
			});

			// Indicate to composite that it is now visible
			return composite.setVisible(true).then(() => {

				// Make sure that the user meanwhile did not open another composite or closed the part containing the composite
				if (!this.activeComposite || composite.getId() !== this.activeComposite.getId()) {
					return;
				}

				// Make sure the composite is layed out
				if (this.contentAreaSize) {
					composite.layout(this.contentAreaSize);
				}

				// Emit Composite Opened Event
				this.emit(WorkbenchEventType.COMPOSITE_OPENED, new CompositeEvent(this.activeComposite.getId()));
			});
		}, (error: any) => this.onError(error));
	}

	protected onTitleAreaUpdate(e: CompositeEvent): void {

		// Active Composite
		if (this.activeComposite && this.activeComposite.getId() === e.compositeId) {

			// Title
			this.updateTitle(this.activeComposite.getId(), this.activeComposite.getTitle());

			// Actions
			let actionsBinding = this.collectCompositeActions(this.activeComposite);
			this.mapActionsBindingToComposite[this.activeComposite.getId()] = actionsBinding;
			actionsBinding();
		}

		// Otherwise invalidate actions binding for next time when the composite becomes visible
		else {
			delete this.mapActionsBindingToComposite[e.compositeId];
		}
	}

	protected updateTitle(compositeId: string, compositeTitle?: string): void {
		let compositeDescriptor = this.registry.getComposite(compositeId);
		if (!compositeDescriptor) {
			return;
		}

		if (!compositeTitle) {
			compositeTitle = compositeDescriptor.name;
		}

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

		this.titleLabel.safeInnerHtml(compositeTitle);
		this.titleLabel.title(keybinding ? nls.localize('compositeTitleTooltip', "{0} ({1})", compositeTitle, keybinding) : compositeTitle);
	}

	private collectCompositeActions(composite: Composite): () => void {

		// From Composite
		let primaryActions: IAction[] = composite.getActions();
		let secondaryActions: IAction[] = composite.getSecondaryActions();

		// From Contributions
		let actionBarRegistry = <IActionBarRegistry>Registry.as(Extensions.Actionbar);
		primaryActions.push(...actionBarRegistry.getActionBarActionsForContext(Scope.VIEW, composite));
		secondaryActions.push(...actionBarRegistry.getSecondaryActionBarActionsForContext(Scope.VIEW, composite));

		// Return fn to set into toolbar
		return this.toolBar.setActions(prepareActions(primaryActions), prepareActions(secondaryActions));
	}

	protected getActiveComposite(): IComposite {
		return this.activeComposite;
	}

	protected getLastActiveCompositetId(): string {
		return this.lastActiveCompositeId;
	}

	protected hideActiveComposite(): TPromise<void> {
		if (!this.activeComposite) {
			return TPromise.as(null); // Nothing to do
		}

		let composite = this.activeComposite;
		this.activeComposite = null;

		let compositeContainer = this.mapCompositeToCompositeContainer[composite.getId()];

		// Indicate to Composite
		return composite.setVisible(false).then(() => {

			// Take Container Off-DOM and hide
			compositeContainer.offDOM();
			compositeContainer.hide();

			// Clear any running Progress
			this.progressBar.stop().getContainer().hide();

			// Empty Actions
			this.toolBar.setActions([])();

			// Clear Listeners
			while (this.activeCompositeListeners.length) {
				this.activeCompositeListeners.pop()();
			}

			// Emit Composite Closed Event
			this.emit(WorkbenchEventType.COMPOSITE_CLOSED, new CompositeEvent(composite.getId()));
		});
	}

	public createTitleArea(parent: Builder): Builder {

		// Title Area Container
		let titleArea = $(parent).div({
			'class': 'title'
		});

		// Right Actions Container
		$(titleArea).div({
			'class': 'title-actions'
		}, (div) => {

			// Toolbar
			this.toolBar = new ToolBar(div.getHTMLElement(), this.contextMenuService, {
				actionItemProvider: (action: Action) => this.actionItemProvider(action),
				orientation: ActionsOrientation.HORIZONTAL
			});
		});

		// Left Title Label
		$(titleArea).div({
			'class': 'title-label'
		}, (div) => {
			this.titleLabel = div.span();
		});

		return titleArea;
	}

	private actionItemProvider(action: Action): IActionItem {
		let actionItem: IActionItem;

		// Check Active Composite
		if (this.activeComposite) {
			actionItem = this.activeComposite.getActionItem(action);
		}

		// Check Registry
		if (!actionItem) {
			let actionBarRegistry = <IActionBarRegistry>Registry.as(Extensions.Actionbar);
			actionItem = actionBarRegistry.getActionItemForContext(Scope.VIEW, ToolBarContext, action);
		}

		return actionItem;
	}

	public createContentArea(parent: Builder): Builder {
		return $(parent).div({
			'class': 'content'
		}, (div: Builder) => {
			this.progressBar = new ProgressBar(div);
			this.progressBar.getContainer().hide();
		});
	}

	private onError(error: any): void {
		this.messageService.show(Severity.Error, types.isString(error) ? new Error(error) : error);
	}

	public layout(dimension: Dimension): Dimension[] {

		// Pass to super
		let sizes = super.layout(dimension);

		// Pass Contentsize to composite
		this.contentAreaSize = sizes[1];
		if (this.activeComposite) {
			this.activeComposite.layout(this.contentAreaSize);
		}

		return sizes;
	}

	public shutdown(): void {
		this.instantiatedComposits.forEach(i => i.shutdown());

		super.shutdown();
	}

	public dispose(): void {
		this.mapCompositeToCompositeContainer = null;
		this.mapProgressServiceToComposite = null;
		this.mapActionsBindingToComposite = null;

		for (let i = 0; i < this.instantiatedComposits.length; i++) {
			this.instantiatedComposits[i].dispose();
		}

		this.instantiatedComposits = [];

		while (this.activeCompositeListeners.length) {
			this.activeCompositeListeners.pop()();
		}

		while (this.instantiatedCompositeListeners.length) {
			this.instantiatedCompositeListeners.pop()();
		}

		this.progressBar.dispose();
		this.toolBar.dispose();

		// Super Dispose
		super.dispose();
	}
}