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

import * as dom from 'vs/base/browser/dom';
import { IKeyboardEvent } from 'vs/base/browser/keyboardEvent';
import { IMouseEvent } from 'vs/base/browser/mouseEvent';
import { IToggleStyles, Toggle } from 'vs/base/browser/ui/toggle/toggle';
import { IContextViewProvider } from 'vs/base/browser/ui/contextview/contextview';
import { CaseSensitiveToggle, RegexToggle, WholeWordsToggle } from 'vs/base/browser/ui/findinput/findInputToggles';
import { HistoryInputBox, IInputBoxStyles, IInputValidator, IMessage as InputBoxMessage } from 'vs/base/browser/ui/inputbox/inputBox';
import { Widget } from 'vs/base/browser/ui/widget';
import { Emitter, Event } from 'vs/base/common/event';
import { KeyCode } from 'vs/base/common/keyCodes';
import 'vs/css!./findInput';
import * as nls from 'vs/nls';
import { DisposableStore } from 'vs/base/common/lifecycle';


export interface IFindInputOptions {
	readonly placeholder?: string;
	readonly width?: number;
	readonly validation?: IInputValidator;
	readonly label: string;
	readonly flexibleHeight?: boolean;
	readonly flexibleWidth?: boolean;
	readonly flexibleMaxHeight?: number;

	readonly showCommonFindToggles?: boolean;
	readonly appendCaseSensitiveLabel?: string;
	readonly appendWholeWordsLabel?: string;
	readonly appendRegexLabel?: string;
	readonly history?: string[];
	readonly additionalToggles?: Toggle[];
	readonly showHistoryHint?: () => boolean;
	readonly toggleStyles: IToggleStyles;
	readonly inputBoxStyles: IInputBoxStyles;
}

const NLS_DEFAULT_LABEL = nls.localize('defaultLabel', "input");

export class FindInput extends Widget {

	static readonly OPTION_CHANGE: string = 'optionChange';

	private placeholder: string;
	private validation?: IInputValidator;
	private label: string;
	private readonly showCommonFindToggles: boolean;
	private fixFocusOnOptionClickEnabled = true;
	private imeSessionInProgress = false;
	private additionalTogglesDisposables: DisposableStore = new DisposableStore();

	protected readonly controls: HTMLDivElement;
	protected readonly regex?: RegexToggle;
	protected readonly wholeWords?: WholeWordsToggle;
	protected readonly caseSensitive?: CaseSensitiveToggle;
	protected additionalToggles: Toggle[] = [];
	public readonly domNode: HTMLElement;
	public readonly inputBox: HistoryInputBox;

	private readonly _onDidOptionChange = this._register(new Emitter<boolean>());
	public readonly onDidOptionChange: Event<boolean /* via keyboard */> = this._onDidOptionChange.event;

	private readonly _onKeyDown = this._register(new Emitter<IKeyboardEvent>());
	public readonly onKeyDown: Event<IKeyboardEvent> = this._onKeyDown.event;

	private readonly _onMouseDown = this._register(new Emitter<IMouseEvent>());
	public readonly onMouseDown: Event<IMouseEvent> = this._onMouseDown.event;

	private readonly _onInput = this._register(new Emitter<void>());
	public readonly onInput: Event<void> = this._onInput.event;

	private readonly _onKeyUp = this._register(new Emitter<IKeyboardEvent>());
	public readonly onKeyUp: Event<IKeyboardEvent> = this._onKeyUp.event;

	private _onCaseSensitiveKeyDown = this._register(new Emitter<IKeyboardEvent>());
	public readonly onCaseSensitiveKeyDown: Event<IKeyboardEvent> = this._onCaseSensitiveKeyDown.event;

	private _onRegexKeyDown = this._register(new Emitter<IKeyboardEvent>());
	public readonly onRegexKeyDown: Event<IKeyboardEvent> = this._onRegexKeyDown.event;

	constructor(parent: HTMLElement | null, contextViewProvider: IContextViewProvider | undefined, options: IFindInputOptions) {
		super();
		this.placeholder = options.placeholder || '';
		this.validation = options.validation;
		this.label = options.label || NLS_DEFAULT_LABEL;
		this.showCommonFindToggles = !!options.showCommonFindToggles;

		const appendCaseSensitiveLabel = options.appendCaseSensitiveLabel || '';
		const appendWholeWordsLabel = options.appendWholeWordsLabel || '';
		const appendRegexLabel = options.appendRegexLabel || '';
		const history = options.history || [];
		const flexibleHeight = !!options.flexibleHeight;
		const flexibleWidth = !!options.flexibleWidth;
		const flexibleMaxHeight = options.flexibleMaxHeight;

		this.domNode = document.createElement('div');
		this.domNode.classList.add('monaco-findInput');

		this.inputBox = this._register(new HistoryInputBox(this.domNode, contextViewProvider, {
			placeholder: this.placeholder || '',
			ariaLabel: this.label || '',
			validationOptions: {
				validation: this.validation
			},
			history,
			showHistoryHint: options.showHistoryHint,
			flexibleHeight,
			flexibleWidth,
			flexibleMaxHeight,
			inputBoxStyles: options.inputBoxStyles,
		}));

		if (this.showCommonFindToggles) {
			this.regex = this._register(new RegexToggle({
				appendTitle: appendRegexLabel,
				isChecked: false,
				...options.toggleStyles
			}));
			this._register(this.regex.onChange(viaKeyboard => {
				this._onDidOptionChange.fire(viaKeyboard);
				if (!viaKeyboard && this.fixFocusOnOptionClickEnabled) {
					this.inputBox.focus();
				}
				this.validate();
			}));
			this._register(this.regex.onKeyDown(e => {
				this._onRegexKeyDown.fire(e);
			}));

			this.wholeWords = this._register(new WholeWordsToggle({
				appendTitle: appendWholeWordsLabel,
				isChecked: false,
				...options.toggleStyles
			}));
			this._register(this.wholeWords.onChange(viaKeyboard => {
				this._onDidOptionChange.fire(viaKeyboard);
				if (!viaKeyboard && this.fixFocusOnOptionClickEnabled) {
					this.inputBox.focus();
				}
				this.validate();
			}));

			this.caseSensitive = this._register(new CaseSensitiveToggle({
				appendTitle: appendCaseSensitiveLabel,
				isChecked: false,
				...options.toggleStyles
			}));
			this._register(this.caseSensitive.onChange(viaKeyboard => {
				this._onDidOptionChange.fire(viaKeyboard);
				if (!viaKeyboard && this.fixFocusOnOptionClickEnabled) {
					this.inputBox.focus();
				}
				this.validate();
			}));
			this._register(this.caseSensitive.onKeyDown(e => {
				this._onCaseSensitiveKeyDown.fire(e);
			}));

			// Arrow-Key support to navigate between options
			const indexes = [this.caseSensitive.domNode, this.wholeWords.domNode, this.regex.domNode];
			this.onkeydown(this.domNode, (event: IKeyboardEvent) => {
				if (event.equals(KeyCode.LeftArrow) || event.equals(KeyCode.RightArrow) || event.equals(KeyCode.Escape)) {
					const index = indexes.indexOf(<HTMLElement>document.activeElement);
					if (index >= 0) {
						let newIndex: number = -1;
						if (event.equals(KeyCode.RightArrow)) {
							newIndex = (index + 1) % indexes.length;
						} else if (event.equals(KeyCode.LeftArrow)) {
							if (index === 0) {
								newIndex = indexes.length - 1;
							} else {
								newIndex = index - 1;
							}
						}

						if (event.equals(KeyCode.Escape)) {
							indexes[index].blur();
							this.inputBox.focus();
						} else if (newIndex >= 0) {
							indexes[newIndex].focus();
						}

						dom.EventHelper.stop(event, true);
					}
				}
			});
		}

		this.controls = document.createElement('div');
		this.controls.className = 'controls';
		this.controls.style.display = this.showCommonFindToggles ? '' : 'none';
		if (this.caseSensitive) {
			this.controls.append(this.caseSensitive.domNode);
		}
		if (this.wholeWords) {
			this.controls.appendChild(this.wholeWords.domNode);
		}
		if (this.regex) {
			this.controls.appendChild(this.regex.domNode);
		}

		this.setAdditionalToggles(options?.additionalToggles);

		if (this.controls) {
			this.domNode.appendChild(this.controls);
		}

		parent?.appendChild(this.domNode);

		this._register(dom.addDisposableListener(this.inputBox.inputElement, 'compositionstart', (e: CompositionEvent) => {
			this.imeSessionInProgress = true;
		}));
		this._register(dom.addDisposableListener(this.inputBox.inputElement, 'compositionend', (e: CompositionEvent) => {
			this.imeSessionInProgress = false;
			this._onInput.fire();
		}));

		this.onkeydown(this.inputBox.inputElement, (e) => this._onKeyDown.fire(e));
		this.onkeyup(this.inputBox.inputElement, (e) => this._onKeyUp.fire(e));
		this.oninput(this.inputBox.inputElement, (e) => this._onInput.fire());
		this.onmousedown(this.inputBox.inputElement, (e) => this._onMouseDown.fire(e));
	}

	public get isImeSessionInProgress(): boolean {
		return this.imeSessionInProgress;
	}

	public get onDidChange(): Event<string> {
		return this.inputBox.onDidChange;
	}

	public layout(style: { collapsedFindWidget: boolean; narrowFindWidget: boolean; reducedFindWidget: boolean }) {
		this.inputBox.layout();
		this.updateInputBoxPadding(style.collapsedFindWidget);
	}

	public enable(): void {
		this.domNode.classList.remove('disabled');
		this.inputBox.enable();
		this.regex?.enable();
		this.wholeWords?.enable();
		this.caseSensitive?.enable();

		for (const toggle of this.additionalToggles) {
			toggle.enable();
		}
	}

	public disable(): void {
		this.domNode.classList.add('disabled');
		this.inputBox.disable();
		this.regex?.disable();
		this.wholeWords?.disable();
		this.caseSensitive?.disable();

		for (const toggle of this.additionalToggles) {
			toggle.disable();
		}
	}

	public setFocusInputOnOptionClick(value: boolean): void {
		this.fixFocusOnOptionClickEnabled = value;
	}

	public setEnabled(enabled: boolean): void {
		if (enabled) {
			this.enable();
		} else {
			this.disable();
		}
	}

	public setAdditionalToggles(toggles: Toggle[] | undefined): void {
		for (const currentToggle of this.additionalToggles) {
			currentToggle.domNode.remove();
		}
		this.additionalToggles = [];
		this.additionalTogglesDisposables.dispose();
		this.additionalTogglesDisposables = new DisposableStore();

		for (const toggle of toggles ?? []) {
			this.additionalTogglesDisposables.add(toggle);
			this.controls.appendChild(toggle.domNode);

			this.additionalTogglesDisposables.add(toggle.onChange(viaKeyboard => {
				this._onDidOptionChange.fire(viaKeyboard);
				if (!viaKeyboard && this.fixFocusOnOptionClickEnabled) {
					this.inputBox.focus();
				}
			}));

			this.additionalToggles.push(toggle);
		}

		if (this.additionalToggles.length > 0) {
			this.controls.style.display = '';
		}

		this.updateInputBoxPadding();
	}

	private updateInputBoxPadding(controlsHidden = false) {
		if (controlsHidden) {
			this.inputBox.paddingRight = 0;
		} else {
			this.inputBox.paddingRight =
				((this.caseSensitive?.width() ?? 0) + (this.wholeWords?.width() ?? 0) + (this.regex?.width() ?? 0))
				+ this.additionalToggles.reduce((r, t) => r + t.width(), 0);
		}
	}

	public clear(): void {
		this.clearValidation();
		this.setValue('');
		this.focus();
	}

	public getValue(): string {
		return this.inputBox.value;
	}

	public setValue(value: string): void {
		if (this.inputBox.value !== value) {
			this.inputBox.value = value;
		}
	}

	public onSearchSubmit(): void {
		this.inputBox.addToHistory();
	}

	public select(): void {
		this.inputBox.select();
	}

	public focus(): void {
		this.inputBox.focus();
	}

	public getCaseSensitive(): boolean {
		return this.caseSensitive?.checked ?? false;
	}

	public setCaseSensitive(value: boolean): void {
		if (this.caseSensitive) {
			this.caseSensitive.checked = value;
		}
	}

	public getWholeWords(): boolean {
		return this.wholeWords?.checked ?? false;
	}

	public setWholeWords(value: boolean): void {
		if (this.wholeWords) {
			this.wholeWords.checked = value;
		}
	}

	public getRegex(): boolean {
		return this.regex?.checked ?? false;
	}

	public setRegex(value: boolean): void {
		if (this.regex) {
			this.regex.checked = value;
			this.validate();
		}
	}

	public focusOnCaseSensitive(): void {
		this.caseSensitive?.focus();
	}

	public focusOnRegex(): void {
		this.regex?.focus();
	}

	private _lastHighlightFindOptions: number = 0;
	public highlightFindOptions(): void {
		this.domNode.classList.remove('highlight-' + (this._lastHighlightFindOptions));
		this._lastHighlightFindOptions = 1 - this._lastHighlightFindOptions;
		this.domNode.classList.add('highlight-' + (this._lastHighlightFindOptions));
	}

	public validate(): void {
		this.inputBox.validate();
	}

	public showMessage(message: InputBoxMessage): void {
		this.inputBox.showMessage(message);
	}

	public clearMessage(): void {
		this.inputBox.hideMessage();
	}

	private clearValidation(): void {
		this.inputBox.hideMessage();
	}
}
