/*---------------------------------------------------------------------------------------------
 *  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 * as nls from 'vs/nls';
import { illegalArgument } from 'vs/base/common/errors';
import { ActionsOrientation, ActionBar } from 'vs/base/browser/ui/actionbar/actionbar';
import { GlobalActivityExtensions, IGlobalActivityRegistry } from 'vs/workbench/common/activity';
import { Registry } from 'vs/platform/registry/common/platform';
import { Part } from 'vs/workbench/browser/part';
import { GlobalActivityActionItem, GlobalActivityAction, ViewletActivityAction, ToggleViewletAction, PlaceHolderToggleCompositePinnedAction, PlaceHolderViewletActivityAction } from 'vs/workbench/browser/parts/activitybar/activitybarActions';
import { IViewletService } from 'vs/workbench/services/viewlet/browser/viewlet';
import { IBadge } from 'vs/workbench/services/activity/common/activity';
import { IPartService, Parts, Position as SideBarPosition } from 'vs/workbench/services/part/common/partService';
import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
import { IDisposable, toDisposable } from 'vs/base/common/lifecycle';
import { ToggleActivityBarVisibilityAction } from 'vs/workbench/browser/actions/toggleActivityBarVisibility';
import { IThemeService, registerThemingParticipant, ITheme } from 'vs/platform/theme/common/themeService';
import { ACTIVITY_BAR_BACKGROUND, ACTIVITY_BAR_BORDER, ACTIVITY_BAR_FOREGROUND, ACTIVITY_BAR_BADGE_BACKGROUND, ACTIVITY_BAR_BADGE_FOREGROUND, ACTIVITY_BAR_DRAG_AND_DROP_BACKGROUND, ACTIVITY_BAR_ITEM_INACTIVE_FOREGROUND, ACTIVITY_BAR_ITEM_ACTIVE_FOREGROUND } from 'vs/workbench/common/theme';
import { contrastBorder } from 'vs/platform/theme/common/colorRegistry';
import { CompositeBar } from 'vs/workbench/browser/parts/compositeBar';
import { isMacintosh } from 'vs/base/common/platform';
import { ILifecycleService, LifecyclePhase } from 'vs/platform/lifecycle/common/lifecycle';
import { scheduleAtNextAnimationFrame, Dimension, addClass } from 'vs/base/browser/dom';
import { Color } from 'vs/base/common/color';
import { IStorageService, StorageScope } from 'vs/platform/storage/common/storage';
import { IExtensionService } from 'vs/workbench/services/extensions/common/extensions';
import { URI } from 'vs/base/common/uri';
import { ToggleCompositePinnedAction, ICompositeBarColors } from 'vs/workbench/browser/parts/compositeBarActions';
import { ViewletDescriptor } from 'vs/workbench/browser/viewlet';

interface IPlaceholderComposite {
	id: string;
	iconUrl: URI;
}

export class ActivitybarPart extends Part {

	private static readonly ACTION_HEIGHT = 50;
	private static readonly PINNED_VIEWLETS = 'workbench.activity.pinnedViewlets';
	private static readonly PLACEHOLDER_VIEWLETS = 'workbench.activity.placeholderViewlets';

	private dimension: Dimension;

	private globalActionBar: ActionBar;
	private globalActivityIdToActions: { [globalActivityId: string]: GlobalActivityAction; } = Object.create(null);

	private placeholderComposites: IPlaceholderComposite[] = [];
	private compositeBar: CompositeBar;
	private compositeActions: { [compositeId: string]: { activityAction: ViewletActivityAction, pinnedAction: ToggleCompositePinnedAction } } = Object.create(null);

	constructor(
		id: string,
		@IViewletService private viewletService: IViewletService,
		@IInstantiationService private instantiationService: IInstantiationService,
		@IPartService private partService: IPartService,
		@IThemeService themeService: IThemeService,
		@ILifecycleService private lifecycleService: ILifecycleService,
		@IStorageService private storageService: IStorageService,
		@IExtensionService private extensionService: IExtensionService
	) {
		super(id, { hasTitle: false }, themeService);

		this.compositeBar = this._register(this.instantiationService.createInstance(CompositeBar, {
			icon: true,
			storageId: ActivitybarPart.PINNED_VIEWLETS,
			orientation: ActionsOrientation.VERTICAL,
			openComposite: (compositeId: string) => this.viewletService.openViewlet(compositeId, true),
			getActivityAction: (compositeId: string) => this.getCompositeActions(compositeId).activityAction,
			getCompositePinnedAction: (compositeId: string) => this.getCompositeActions(compositeId).pinnedAction,
			getOnCompositeClickAction: (compositeId: string) => this.instantiationService.createInstance(ToggleViewletAction, this.viewletService.getViewlet(compositeId)),
			getContextMenuActions: () => [this.instantiationService.createInstance(ToggleActivityBarVisibilityAction, ToggleActivityBarVisibilityAction.ID, nls.localize('hideActivitBar', "Hide Activity Bar"))],
			getDefaultCompositeId: () => this.viewletService.getDefaultViewletId(),
			hidePart: () => this.partService.setSideBarHidden(true),
			compositeSize: 50,
			colors: theme => this.getActivitybarItemColors(theme),
			overflowActionSize: ActivitybarPart.ACTION_HEIGHT
		}));

		const previousState = this.storageService.get(ActivitybarPart.PLACEHOLDER_VIEWLETS, StorageScope.GLOBAL, '[]');
		this.placeholderComposites = <IPlaceholderComposite[]>JSON.parse(previousState);
		this.placeholderComposites.forEach((s) => {
			if (typeof s.iconUrl === 'object') {
				s.iconUrl = URI.revive(s.iconUrl);
			} else {
				s.iconUrl = void 0;
			}
		});

		this.registerListeners();
		this.updateCompositebar();
	}

	private registerListeners(): void {
		this._register(this.viewletService.onDidViewletRegister(() => this.updateCompositebar()));

		// Activate viewlet action on opening of a viewlet
		this._register(this.viewletService.onDidViewletOpen(viewlet => this.compositeBar.activateComposite(viewlet.getId())));

		// Deactivate viewlet action on close
		this._register(this.viewletService.onDidViewletClose(viewlet => this.compositeBar.deactivateComposite(viewlet.getId())));
		this._register(this.viewletService.onDidViewletEnablementChange(({ id, enabled }) => {
			if (enabled) {
				this.compositeBar.addComposite(this.viewletService.getViewlet(id));
			} else {
				this.removeComposite(id, true);
			}
		}));

		this._register(this.extensionService.onDidRegisterExtensions(() => this.onDidRegisterExtensions()));
	}

	private onDidRegisterExtensions(): void {
		this.removeNotExistingComposites();
		this.updateCompositebar();
	}

	showActivity(viewletOrActionId: string, badge: IBadge, clazz?: string, priority?: number): IDisposable {
		if (this.viewletService.getViewlet(viewletOrActionId)) {
			return this.compositeBar.showActivity(viewletOrActionId, badge, clazz, priority);
		}

		return this.showGlobalActivity(viewletOrActionId, badge, clazz);
	}

	private showGlobalActivity(globalActivityId: string, badge: IBadge, clazz?: string): IDisposable {
		if (!badge) {
			throw illegalArgument('badge');
		}

		const action = this.globalActivityIdToActions[globalActivityId];
		if (!action) {
			throw illegalArgument('globalActivityId');
		}

		action.setBadge(badge, clazz);

		return toDisposable(() => action.setBadge(undefined));
	}

	createContentArea(parent: HTMLElement): HTMLElement {
		const content = document.createElement('div');
		addClass(content, 'content');
		parent.appendChild(content);

		// Top Actionbar with action items for each viewlet action
		this.compositeBar.create(content);

		// Top Actionbar with action items for each viewlet action
		const globalActivities = document.createElement('div');
		addClass(globalActivities, 'global-activity');
		content.appendChild(globalActivities);

		this.createGlobalActivityActionBar(globalActivities);

		// TODO@Ben: workaround for https://github.com/Microsoft/vscode/issues/45700
		// It looks like there are rendering glitches on macOS with Chrome 61 when
		// using --webkit-mask with a background color that is different from the image
		// The workaround is to promote the element onto its own drawing layer. We do
		// this only after the workbench has loaded because otherwise there is ugly flicker.
		if (isMacintosh) {
			this.lifecycleService.when(LifecyclePhase.Running).then(() => {
				scheduleAtNextAnimationFrame(() => { // another delay...
					scheduleAtNextAnimationFrame(() => { // ...to prevent more flickering on startup
						registerThemingParticipant((theme, collector) => {
							const activityBarForeground = theme.getColor(ACTIVITY_BAR_FOREGROUND);
							if (activityBarForeground && !activityBarForeground.equals(Color.white)) {
								// only apply this workaround if the color is different from the image one (white)
								collector.addRule('.monaco-workbench .activitybar > .content .monaco-action-bar .action-label { will-change: transform; }');
							}
						});
					});
				});
			});
		}

		return content;
	}

	updateStyles(): void {
		super.updateStyles();

		// Part container
		const container = this.getContainer();
		const background = this.getColor(ACTIVITY_BAR_BACKGROUND);
		container.style.backgroundColor = background;

		const borderColor = this.getColor(ACTIVITY_BAR_BORDER) || this.getColor(contrastBorder);
		const isPositionLeft = this.partService.getSideBarPosition() === SideBarPosition.LEFT;
		container.style.boxSizing = borderColor && isPositionLeft ? 'border-box' : null;
		container.style.borderRightWidth = borderColor && isPositionLeft ? '1px' : null;
		container.style.borderRightStyle = borderColor && isPositionLeft ? 'solid' : null;
		container.style.borderRightColor = isPositionLeft ? borderColor : null;
		container.style.borderLeftWidth = borderColor && !isPositionLeft ? '1px' : null;
		container.style.borderLeftStyle = borderColor && !isPositionLeft ? 'solid' : null;
		container.style.borderLeftColor = !isPositionLeft ? borderColor : null;
	}

	private getActivitybarItemColors(theme: ITheme): ICompositeBarColors {
		return <ICompositeBarColors>{
			backgroundColor: theme.defines(ACTIVITY_BAR_ITEM_INACTIVE_FOREGROUND) ? theme.getColor(ACTIVITY_BAR_ITEM_INACTIVE_FOREGROUND) : theme.getColor(ACTIVITY_BAR_FOREGROUND).transparent(0.6),
			activeBackgroundColor: theme.defines(ACTIVITY_BAR_ITEM_ACTIVE_FOREGROUND) ? theme.getColor(ACTIVITY_BAR_ITEM_ACTIVE_FOREGROUND) : theme.getColor(ACTIVITY_BAR_FOREGROUND),
			badgeBackground: theme.getColor(ACTIVITY_BAR_BADGE_BACKGROUND),
			badgeForeground: theme.getColor(ACTIVITY_BAR_BADGE_FOREGROUND),
			dragAndDropBackground: theme.getColor(ACTIVITY_BAR_DRAG_AND_DROP_BACKGROUND)
		};
	}

	private createGlobalActivityActionBar(container: HTMLElement): void {
		const activityRegistry = Registry.as<IGlobalActivityRegistry>(GlobalActivityExtensions);
		const descriptors = activityRegistry.getActivities();
		const actions = descriptors
			.map(d => this.instantiationService.createInstance(d))
			.map(a => new GlobalActivityAction(a));

		this.globalActionBar = this._register(new ActionBar(container, {
			actionItemProvider: a => this.instantiationService.createInstance(GlobalActivityActionItem, a, theme => this.getActivitybarItemColors(theme)),
			orientation: ActionsOrientation.VERTICAL,
			ariaLabel: nls.localize('globalActions', "Global Actions"),
			animated: false
		}));

		actions.forEach(a => {
			this.globalActivityIdToActions[a.id] = a;
			this.globalActionBar.push(a);
		});
	}

	private getCompositeActions(compositeId: string): { activityAction: ViewletActivityAction, pinnedAction: ToggleCompositePinnedAction } {
		let compositeActions = this.compositeActions[compositeId];
		if (!compositeActions) {
			const viewlet = this.viewletService.getViewlet(compositeId);
			if (viewlet) {
				compositeActions = {
					activityAction: this.instantiationService.createInstance(ViewletActivityAction, viewlet),
					pinnedAction: new ToggleCompositePinnedAction(viewlet, this.compositeBar)
				};
			} else {
				const placeHolderComposite = this.placeholderComposites.filter(c => c.id === compositeId)[0];
				compositeActions = {
					activityAction: this.instantiationService.createInstance(PlaceHolderViewletActivityAction, compositeId, placeHolderComposite && placeHolderComposite.iconUrl),
					pinnedAction: new PlaceHolderToggleCompositePinnedAction(compositeId, this.compositeBar)
				};
			}

			this.compositeActions[compositeId] = compositeActions;
		}

		return compositeActions;
	}

	private updateCompositebar(): void {
		const viewlets = this.viewletService.getViewlets();
		for (const viewlet of viewlets) {
			this.compositeBar.addComposite(viewlet);

			// Pin it by default if it is new => it does not has a placeholder
			if (this.placeholderComposites.every(c => c.id !== viewlet.id)) {
				this.compositeBar.pin(viewlet.id);
			}

			this.enableCompositeActions(viewlet);
			const activeViewlet = this.viewletService.getActiveViewlet();
			if (activeViewlet && activeViewlet.getId() === viewlet.id) {
				this.compositeBar.pin(viewlet.id);
				this.compositeBar.activateComposite(viewlet.id);
			}
		}
	}

	private removeNotExistingComposites(): void {
		const viewlets = this.viewletService.getAllViewlets();
		for (const { id } of this.compositeBar.getComposites()) {
			if (viewlets.every(viewlet => viewlet.id !== id)) {
				this.removeComposite(id, false);
			}
		}
	}

	private removeComposite(compositeId: string, hide: boolean): void {
		if (hide) {
			this.compositeBar.hideComposite(compositeId);
		} else {
			this.compositeBar.removeComposite(compositeId);
		}
		const compositeActions = this.compositeActions[compositeId];
		if (compositeActions) {
			compositeActions.activityAction.dispose();
			compositeActions.pinnedAction.dispose();
			delete this.compositeActions[compositeId];
		}
	}

	private enableCompositeActions(viewlet: ViewletDescriptor): void {
		const { activityAction, pinnedAction } = this.getCompositeActions(viewlet.id);
		if (activityAction instanceof PlaceHolderViewletActivityAction) {
			activityAction.setActivity(viewlet);
		}
		if (pinnedAction instanceof PlaceHolderToggleCompositePinnedAction) {
			pinnedAction.setActivity(viewlet);
		}
	}

	getPinned(): string[] {
		return this.viewletService.getViewlets().map(v => v.id).filter(id => this.compositeBar.isPinned(id));
	}

	layout(dimension: Dimension): Dimension[] {
		if (!this.partService.isVisible(Parts.ACTIVITYBAR_PART)) {
			return [dimension];
		}

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

		this.dimension = sizes[1];

		let availableHeight = this.dimension.height;
		if (this.globalActionBar) {
			// adjust height for global actions showing
			availableHeight -= (this.globalActionBar.items.length * ActivitybarPart.ACTION_HEIGHT);
		}
		this.compositeBar.layout(new Dimension(dimension.width, availableHeight));

		return sizes;
	}

	shutdown(): void {
		const state = this.viewletService.getAllViewlets().map(({ id, iconUrl }) => ({ id, iconUrl }));
		this.storageService.store(ActivitybarPart.PLACEHOLDER_VIEWLETS, JSON.stringify(state), StorageScope.GLOBAL);

		super.shutdown();
	}
}