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

import 'vs/css!./media/selectBox';

import { SelectBox as vsSelectBox, ISelectBoxStyles as vsISelectBoxStyles, ISelectBoxOptions, ISelectOptionItem } from 'vs/base/browser/ui/selectBox/selectBox';
import { Color } from 'vs/base/common/color';
import { IContextViewProvider, AnchorAlignment } from 'vs/base/browser/ui/contextview/contextview';
import * as dom from 'vs/base/browser/dom';
import { RenderOptions, renderFormattedText, renderText } from 'vs/base/browser/htmlContentRenderer';
import { IMessage, MessageType } from 'vs/base/browser/ui/inputbox/inputBox';
import * as aria from 'vs/base/browser/ui/aria/aria';
import * as nls from 'vs/nls';

const $ = dom.$;

export interface ISelectBoxStyles extends vsISelectBoxStyles {
	disabledSelectBackground?: Color;
	disabledSelectForeground?: Color;
	inputValidationInfoBorder?: Color;
	inputValidationInfoBackground?: Color;
	inputinputValidationInfoForeground?: Color;
	inputValidationWarningBorder?: Color;
	inputValidationWarningBackground?: Color;
	inputValidationWarningForeground?: Color;
	inputValidationErrorBorder?: Color;
	inputValidationErrorBackground?: Color;
	inputValidationErrorForeground?: Color;
}

export class SelectBox extends vsSelectBox {
	private _optionsDictionary: Map<string, number>;
	private _dialogOptions: string[];
	private _selectedOption: string;
	private _selectBoxOptions?: ISelectBoxOptions;
	private enabledSelectBackground?: Color;
	private enabledSelectForeground?: Color;
	private enabledSelectBorder?: Color;
	private disabledSelectBackground?: Color;
	private disabledSelectForeground?: Color;
	private disabledSelectBorder?: Color;
	private contextViewProvider: IContextViewProvider;
	private message?: IMessage;

	private inputValidationInfoBorder?: Color;
	private inputValidationInfoBackground?: Color;
	private inputValidationInfoForeground?: Color;
	private inputValidationWarningBorder?: Color;
	private inputValidationWarningBackground?: Color;
	private inputValidationWarningForeground?: Color;
	private inputValidationErrorBorder?: Color;
	private inputValidationErrorBackground?: Color;
	private inputValidationErrorForeground?: Color;

	private element: HTMLElement;

	constructor(options: string[], selectedOption: string, contextViewProvider: IContextViewProvider, container?: HTMLElement, selectBoxOptions?: ISelectBoxOptions) {
		super(options.map(option => { return { text: option }; }), 0, contextViewProvider, undefined, selectBoxOptions);
		this._optionsDictionary = new Map<string, number>();
		for (let i = 0; i < options.length; i++) {
			this._optionsDictionary.set(options[i], i);
		}
		const option = this._optionsDictionary.get(selectedOption);
		if (option) {
			super.select(option);
		}
		this._selectedOption = selectedOption;
		this._dialogOptions = options;
		this._register(this.onDidSelect(newInput => {
			this._selectedOption = newInput.selected;
		}));

		this.enabledSelectBackground = this.selectBackground;
		this.enabledSelectForeground = this.selectForeground;
		this.enabledSelectBorder = this.selectBorder;
		this.disabledSelectBackground = Color.transparent;
		this.disabledSelectForeground = undefined;
		this.disabledSelectBorder = undefined;
		this.contextViewProvider = contextViewProvider;
		if (container) {
			this.element = dom.append(container, $('.monaco-selectbox.idle'));
		}

		// explicitly set the accessible role so that the screen readers can read the control type properly
		this.selectElement.setAttribute('role', 'combobox');

		this._selectBoxOptions = selectBoxOptions;
		let focusTracker = dom.trackFocus(this.selectElement);
		this._register(focusTracker);
		this._register(focusTracker.onDidBlur(() => this._hideMessage()));
		this._register(focusTracker.onDidFocus(() => this._showMessage()));
	}

	public style(styles: ISelectBoxStyles): void {
		super.style(styles);
		this.enabledSelectBackground = this.selectBackground;
		this.enabledSelectForeground = this.selectForeground;
		this.enabledSelectBorder = this.selectBorder;
		this.disabledSelectBackground = styles.disabledSelectBackground;
		this.disabledSelectForeground = styles.disabledSelectForeground;
		this.inputValidationInfoBorder = styles.inputValidationInfoBorder;
		this.inputValidationInfoBackground = styles.inputValidationInfoBackground;
		this.inputValidationInfoForeground = styles.inputinputValidationInfoForeground;
		this.inputValidationWarningBorder = styles.inputValidationWarningBorder;
		this.inputValidationWarningBackground = styles.inputValidationWarningBackground;
		this.inputValidationWarningForeground = styles.inputValidationWarningForeground;
		this.inputValidationErrorBorder = styles.inputValidationErrorBorder;
		this.inputValidationErrorBackground = styles.inputValidationErrorBackground;
		this.inputValidationErrorForeground = styles.inputValidationErrorForeground;
		this.applyStyles();
	}

	public selectWithOptionName(optionName: string): void {
		const option = this._optionsDictionary.get(optionName);
		if (option) {
			this.select(option);
		} else {
			this.select(0);
		}
	}

	public select(index: number): void {
		super.select(index);
		if (this._dialogOptions !== undefined) {
			this._selectedOption = this._dialogOptions[index];
		}
	}

	public setOptions(options: string[] | ISelectOptionItem[], selected?: number): void {
		let stringOptions: string[];
		if (options.length > 0 && typeof options[0] !== 'string') {
			stringOptions = (options as ISelectOptionItem[]).map(option => option.text);
		} else {
			stringOptions = options as string[];
		}
		this._optionsDictionary = new Map<string, number>();
		for (let i = 0; i < stringOptions.length; i++) {
			this._optionsDictionary.set(stringOptions[i], i);
		}
		this._dialogOptions = stringOptions;
		super.setOptions(stringOptions.map(option => { return { text: option }; }), selected);
	}

	public get value(): string {
		return this._selectedOption;
	}

	public get values(): string[] {
		return this._dialogOptions;
	}

	public enable(): void {
		this.selectElement.disabled = false;
		this.selectBackground = this.enabledSelectBackground;
		this.selectForeground = this.enabledSelectForeground;
		this.selectBorder = this.enabledSelectBorder;
		this.applyStyles();
	}

	public disable(): void {
		this.selectElement.disabled = true;
		this.selectBackground = this.disabledSelectBackground;
		this.selectForeground = this.disabledSelectForeground;
		this.selectBorder = this.disabledSelectBorder;
		this.applyStyles();
	}

	public hasFocus(): boolean {
		return document.activeElement === this.selectElement;
	}

	public showMessage(message: IMessage): void {
		this.message = message;

		if (this.element) {
			dom.removeClass(this.element, 'idle');
			dom.removeClass(this.element, 'info');
			dom.removeClass(this.element, 'warning');
			dom.removeClass(this.element, 'error');
			dom.addClass(this.element, this.classForType(message.type));
		}

		// ARIA Support
		let alertText: string;
		if (message.type === MessageType.ERROR) {
			alertText = nls.localize('alertErrorMessage', "Error: {0}", message.content);
		} else if (message.type === MessageType.WARNING) {
			alertText = nls.localize('alertWarningMessage', "Warning: {0}", message.content);
		} else {
			alertText = nls.localize('alertInfoMessage', "Info: {0}", message.content);
		}

		aria.alert(alertText);

		if (this.hasFocus()) {
			this._showMessage();
		}
	}

	public _showMessage(): void {
		if (this.message && this.contextViewProvider && this.element) {
			const message = this.message;
			let div: HTMLElement;
			let layout = () => div.style.width = dom.getTotalWidth(this.selectElement) + 'px';

			this.contextViewProvider.showContextView({
				getAnchor: () => this.selectElement,
				anchorAlignment: AnchorAlignment.RIGHT,
				render: (container: HTMLElement) => {
					div = dom.append(container, $('.monaco-inputbox-container'));
					layout();

					const renderOptions: RenderOptions = {
						inline: true,
						className: 'monaco-inputbox-message'
					};

					let spanElement: HTMLElement = (message.formatContent
						? renderFormattedText(message.content, renderOptions)
						: renderText(message.content, renderOptions)) as any;
					dom.addClass(spanElement, this.classForType(message.type));

					const styles = this.stylesForType(message.type);
					spanElement.style.backgroundColor = styles.background ? styles.background.toString() : null;
					spanElement.style.border = styles.border ? `1px solid ${styles.border}` : null;

					dom.append(div, spanElement);

					return null;
				},
				layout: layout
			});
		}
	}

	public hideMessage(): void {
		dom.removeClass(this.element, 'info');
		dom.removeClass(this.element, 'warning');
		dom.removeClass(this.element, 'error');
		dom.addClass(this.element, 'idle');

		this._hideMessage();
		this.applyStyles();

		this.message = undefined;
	}

	private _hideMessage(): void {
		if (this.message && this.contextViewProvider) {
			this.contextViewProvider.hideContextView();
		}
	}

	private classForType(type: MessageType | undefined): string {
		switch (type) {
			case MessageType.INFO: return 'info';
			case MessageType.WARNING: return 'warning';
			default: return 'error';
		}
	}

	private stylesForType(type: MessageType | undefined): { border: Color | undefined; background: Color | undefined; foreground: Color | undefined } {
		switch (type) {
			case MessageType.INFO: return { border: this.inputValidationInfoBorder, background: this.inputValidationInfoBackground, foreground: this.inputValidationInfoForeground };
			case MessageType.WARNING: return { border: this.inputValidationWarningBorder, background: this.inputValidationWarningBackground, foreground: this.inputValidationWarningForeground };
			default: return { border: this.inputValidationErrorBorder, background: this.inputValidationErrorBackground, foreground: this.inputValidationErrorForeground };
		}
	}

	public render(container: HTMLElement): void {
		let selectOptions: ISelectBoxOptionsWithLabel = this._selectBoxOptions as ISelectBoxOptionsWithLabel;

		if (selectOptions && selectOptions.labelText && selectOptions.labelText !== undefined) {
			let outerContainer = document.createElement('div');
			let selectContainer = document.createElement('div');

			outerContainer.className = selectOptions.labelOnTop ? 'labelOnTopContainer' : 'labelOnLeftContainer';

			let labelText = document.createElement('div');
			labelText.className = 'action-item-label';
			labelText.innerHTML = selectOptions.labelText;

			container.appendChild(outerContainer);
			outerContainer.appendChild(labelText);
			outerContainer.appendChild(selectContainer);

			super.render(selectContainer);
			this.selectElement.classList.add('action-item-label');
		}
		else {
			super.render(container);
		}
	}
}

export interface ISelectBoxOptionsWithLabel extends ISelectBoxOptions {
	labelText?: string;
	labelOnTop?: boolean;
}