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

'use strict';

import 'vs/css!./media/peekViewWidget';
import * as nls from 'vs/nls';
import { Action } from 'vs/base/common/actions';
import * as strings from 'vs/base/common/strings';
import * as objects from 'vs/base/common/objects';
import { $ } from 'vs/base/browser/builder';
import { Event, Emitter } from 'vs/base/common/event';
import * as dom from 'vs/base/browser/dom';
import { ActionBar, IActionBarOptions } from 'vs/base/browser/ui/actionbar/actionbar';
import { ServicesAccessor } from 'vs/platform/instantiation/common/instantiation';
import { ICodeEditorService } from 'vs/editor/browser/services/codeEditorService';
import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
import { IOptions, ZoneWidget, IStyles } from 'vs/editor/contrib/zoneWidget/zoneWidget';
import { EmbeddedCodeEditorWidget } from 'vs/editor/browser/widget/embeddedCodeEditorWidget';
import { ContextKeyExpr, RawContextKey } from 'vs/platform/contextkey/common/contextkey';
import { Color } from 'vs/base/common/color';

export namespace PeekContext {
	export const inPeekEditor = new RawContextKey<boolean>('inReferenceSearchEditor', true);
	export const notInPeekEditor: ContextKeyExpr = inPeekEditor.toNegated();
}

export function getOuterEditor(accessor: ServicesAccessor): ICodeEditor {
	let editor = accessor.get(ICodeEditorService).getFocusedCodeEditor();
	if (editor instanceof EmbeddedCodeEditorWidget) {
		return editor.getParentEditor();
	}
	return editor;
}

export interface IPeekViewStyles extends IStyles {
	headerBackgroundColor?: Color;
	primaryHeadingColor?: Color;
	secondaryHeadingColor?: Color;
}

export interface IPeekViewOptions extends IOptions, IPeekViewStyles {
}

const defaultOptions: IPeekViewOptions = {
	headerBackgroundColor: Color.white,
	primaryHeadingColor: Color.fromHex('#333333'),
	secondaryHeadingColor: Color.fromHex('#6c6c6cb3')
};

export abstract class PeekViewWidget extends ZoneWidget {

	public _serviceBrand: any;

	private _onDidClose = new Emitter<PeekViewWidget>();

	protected _headElement: HTMLDivElement;
	protected _primaryHeading: HTMLElement;
	protected _secondaryHeading: HTMLElement;
	protected _metaHeading: HTMLElement;
	protected _actionbarWidget: ActionBar;
	protected _bodyElement: HTMLDivElement;

	constructor(editor: ICodeEditor, options: IPeekViewOptions = {}) {
		super(editor, options);
		objects.mixin(this.options, defaultOptions, false);
	}

	public dispose(): void {
		super.dispose();
		this._onDidClose.fire(this);
	}

	public get onDidClose(): Event<PeekViewWidget> {
		return this._onDidClose.event;
	}

	public style(styles: IPeekViewStyles): void {
		let options = <IPeekViewOptions>this.options;
		if (styles.headerBackgroundColor) {
			options.headerBackgroundColor = styles.headerBackgroundColor;
		}
		if (styles.primaryHeadingColor) {
			options.primaryHeadingColor = styles.primaryHeadingColor;
		}
		if (styles.secondaryHeadingColor) {
			options.secondaryHeadingColor = styles.secondaryHeadingColor;
		}
		super.style(styles);
	}

	protected _applyStyles(): void {
		super._applyStyles();
		let options = <IPeekViewOptions>this.options;
		if (this._headElement) {
			this._headElement.style.backgroundColor = options.headerBackgroundColor.toString();
		}
		if (this._primaryHeading) {
			this._primaryHeading.style.color = options.primaryHeadingColor.toString();
		}
		if (this._secondaryHeading) {
			this._secondaryHeading.style.color = options.secondaryHeadingColor.toString();
		}
		if (this._bodyElement) {
			this._bodyElement.style.borderColor = options.frameColor.toString();
		}
	}

	protected _fillContainer(container: HTMLElement): void {
		this.setCssClass('peekview-widget');

		this._headElement = <HTMLDivElement>$('.head').getHTMLElement();
		this._bodyElement = <HTMLDivElement>$('.body').getHTMLElement();

		this._fillHead(this._headElement);
		this._fillBody(this._bodyElement);

		container.appendChild(this._headElement);
		container.appendChild(this._bodyElement);
	}

	protected _fillHead(container: HTMLElement): void {
		const titleElement = $('.peekview-title').
			on(dom.EventType.CLICK, e => this._onTitleClick(<MouseEvent>e)).
			appendTo(this._headElement).
			getHTMLElement();

		this._primaryHeading = $('span.filename').appendTo(titleElement).getHTMLElement();
		this._secondaryHeading = $('span.dirname').appendTo(titleElement).getHTMLElement();
		this._metaHeading = $('span.meta').appendTo(titleElement).getHTMLElement();

		const actionsContainer = $('.peekview-actions').appendTo(this._headElement);
		const actionBarOptions = this._getActionBarOptions();
		this._actionbarWidget = new ActionBar(actionsContainer.getHTMLElement(), actionBarOptions);
		this._disposables.push(this._actionbarWidget);

		this._actionbarWidget.push(new Action('peekview.close', nls.localize('label.close', "Close"), 'close-peekview-action', true, () => {
			this.dispose();
			return null;
		}), { label: false, icon: true });
	}

	protected _getActionBarOptions(): IActionBarOptions {
		return {};
	}

	protected _onTitleClick(event: MouseEvent): void {
		// implement me
	}

	public setTitle(primaryHeading: string, secondaryHeading?: string): void {
		$(this._primaryHeading).safeInnerHtml(primaryHeading);
		this._primaryHeading.setAttribute('aria-label', primaryHeading);
		if (secondaryHeading) {
			$(this._secondaryHeading).safeInnerHtml(secondaryHeading);
		} else {
			dom.clearNode(this._secondaryHeading);
		}
	}

	public setMetaTitle(value: string): void {
		if (value) {
			$(this._metaHeading).safeInnerHtml(value);
		} else {
			dom.clearNode(this._metaHeading);
		}
	}

	protected abstract _fillBody(container: HTMLElement): void;

	public _doLayout(heightInPixel: number, widthInPixel: number): void {

		if (!this._isShowing && heightInPixel < 0) {
			// Looks like the view zone got folded away!
			this.dispose();
			return;
		}

		const headHeight = Math.ceil(this.editor.getConfiguration().lineHeight * 1.2);
		const bodyHeight = heightInPixel - (headHeight + 2 /* the border-top/bottom width*/);

		this._doLayoutHead(headHeight, widthInPixel);
		this._doLayoutBody(bodyHeight, widthInPixel);
	}

	protected _doLayoutHead(heightInPixel: number, widthInPixel: number): void {
		this._headElement.style.height = strings.format('{0}px', heightInPixel);
		this._headElement.style.lineHeight = this._headElement.style.height;
	}

	protected _doLayoutBody(heightInPixel: number, widthInPixel: number): void {
		this._bodyElement.style.height = strings.format('{0}px', heightInPixel);
	}
}