/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import * as browser from '../../../base/browser/browser';
import * as dom from '../../../base/browser/dom';
import { RunOnceScheduler } from '../../../base/common/async';
import { Emitter } from '../../../base/common/event';
import { Disposable } from '../../../base/common/lifecycle';
import * as platform from '../../../base/common/platform';
import * as strings from '../../../base/common/strings';
import { TextAreaState, _debugComposition } from './textAreaState';
import { Position } from '../../common/core/position';
import { Selection } from '../../common/core/selection';
import { BrowserFeatures } from '../../../base/browser/canIUse';
export const CopyOptions = {
    forceCopyWithSyntaxHighlighting: false
};
/**
 * Every time we write to the clipboard, we record a bit of extra metadata here.
 * Every time we read from the cipboard, if the text matches our last written text,
 * we can fetch the previous metadata.
 */
export class InMemoryClipboardMetadataManager {
    constructor() {
        this._lastState = null;
    }
    set(lastCopiedValue, data) {
        this._lastState = { lastCopiedValue, data };
    }
    get(pastedText) {
        if (this._lastState && this._lastState.lastCopiedValue === pastedText) {
            // match!
            return this._lastState.data;
        }
        this._lastState = null;
        return null;
    }
}
InMemoryClipboardMetadataManager.INSTANCE = new InMemoryClipboardMetadataManager();
/**
 * Writes screen reader content to the textarea and is able to analyze its input events to generate:
 *  - onCut
 *  - onPaste
 *  - onType
 *
 * Composition events are generated for presentation purposes (composition input is reflected in onType).
 */
export class TextAreaInput extends Disposable {
    constructor(host, textArea) {
        super();
        this.textArea = textArea;
        this._onFocus = this._register(new Emitter());
        this.onFocus = this._onFocus.event;
        this._onBlur = this._register(new Emitter());
        this.onBlur = this._onBlur.event;
        this._onKeyDown = this._register(new Emitter());
        this.onKeyDown = this._onKeyDown.event;
        this._onKeyUp = this._register(new Emitter());
        this.onKeyUp = this._onKeyUp.event;
        this._onCut = this._register(new Emitter());
        this.onCut = this._onCut.event;
        this._onPaste = this._register(new Emitter());
        this.onPaste = this._onPaste.event;
        this._onType = this._register(new Emitter());
        this.onType = this._onType.event;
        this._onCompositionStart = this._register(new Emitter());
        this.onCompositionStart = this._onCompositionStart.event;
        this._onCompositionUpdate = this._register(new Emitter());
        this.onCompositionUpdate = this._onCompositionUpdate.event;
        this._onCompositionEnd = this._register(new Emitter());
        this.onCompositionEnd = this._onCompositionEnd.event;
        this._onSelectionChangeRequest = this._register(new Emitter());
        this.onSelectionChangeRequest = this._onSelectionChangeRequest.event;
        this._host = host;
        this._textArea = this._register(new TextAreaWrapper(textArea));
        this._asyncTriggerCut = this._register(new RunOnceScheduler(() => this._onCut.fire(), 0));
        this._asyncFocusGainWriteScreenReaderContent = this._register(new RunOnceScheduler(() => this.writeScreenReaderContent('asyncFocusGain'), 0));
        this._textAreaState = TextAreaState.EMPTY;
        this._selectionChangeListener = null;
        this.writeScreenReaderContent('ctor');
        this._hasFocus = false;
        this._isDoingComposition = false;
        this._nextCommand = 0 /* Type */;
        let lastKeyDown = null;
        this._register(dom.addStandardDisposableListener(textArea.domNode, 'keydown', (e) => {
            if (e.keyCode === 109 /* KEY_IN_COMPOSITION */
                || (this._isDoingComposition && e.keyCode === 1 /* Backspace */)) {
                // Stop propagation for keyDown events if the IME is processing key input
                e.stopPropagation();
            }
            if (e.equals(9 /* Escape */)) {
                // Prevent default always for `Esc`, otherwise it will generate a keypress
                // See https://msdn.microsoft.com/en-us/library/ie/ms536939(v=vs.85).aspx
                e.preventDefault();
            }
            lastKeyDown = e;
            this._onKeyDown.fire(e);
        }));
        this._register(dom.addStandardDisposableListener(textArea.domNode, 'keyup', (e) => {
            this._onKeyUp.fire(e);
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'compositionstart', (e) => {
            if (_debugComposition) {
                console.log(`[compositionstart]`, e);
            }
            if (this._isDoingComposition) {
                return;
            }
            this._isDoingComposition = true;
            let moveOneCharacterLeft = false;
            if (platform.isMacintosh
                && lastKeyDown
                && lastKeyDown.equals(109 /* KEY_IN_COMPOSITION */)
                && this._textAreaState.selectionStart === this._textAreaState.selectionEnd
                && this._textAreaState.selectionStart > 0
                && this._textAreaState.value.substr(this._textAreaState.selectionStart - 1, 1) === e.data) {
                // Handling long press case on macOS + arrow key => pretend the character was selected
                if (lastKeyDown.code === 'ArrowRight' || lastKeyDown.code === 'ArrowLeft') {
                    if (_debugComposition) {
                        console.log(`[compositionstart] Handling long press case on macOS + arrow key`, e);
                    }
                    moveOneCharacterLeft = true;
                }
            }
            if (moveOneCharacterLeft) {
                this._textAreaState = new TextAreaState(this._textAreaState.value, this._textAreaState.selectionStart - 1, this._textAreaState.selectionEnd, this._textAreaState.selectionStartPosition ? new Position(this._textAreaState.selectionStartPosition.lineNumber, this._textAreaState.selectionStartPosition.column - 1) : null, this._textAreaState.selectionEndPosition);
            }
            else {
                this._setAndWriteTextAreaState('compositionstart', TextAreaState.EMPTY);
            }
            this._onCompositionStart.fire({ moveOneCharacterLeft });
        }));
        /**
         * Deduce the typed input from a text area's value and the last observed state.
         */
        const deduceInputFromTextAreaValue = (couldBeEmojiInput) => {
            const oldState = this._textAreaState;
            const newState = TextAreaState.readFromTextArea(this._textArea);
            return [newState, TextAreaState.deduceInput(oldState, newState, couldBeEmojiInput)];
        };
        /**
         * Deduce the composition input from a string.
         */
        const deduceComposition = (text) => {
            const oldState = this._textAreaState;
            const newState = TextAreaState.selectedText(text);
            const typeInput = {
                text: newState.value,
                replaceCharCnt: oldState.selectionEnd - oldState.selectionStart
            };
            return [newState, typeInput];
        };
        this._register(dom.addDisposableListener(textArea.domNode, 'compositionupdate', (e) => {
            if (_debugComposition) {
                console.log(`[compositionupdate]`, e);
            }
            const [newState, typeInput] = deduceComposition(e.data || '');
            this._textAreaState = newState;
            this._onType.fire(typeInput);
            this._onCompositionUpdate.fire(e);
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'compositionend', (e) => {
            if (_debugComposition) {
                console.log(`[compositionend]`, e);
            }
            // https://github.com/microsoft/monaco-editor/issues/1663
            // On iOS 13.2, Chinese system IME randomly trigger an additional compositionend event with empty data
            if (!this._isDoingComposition) {
                return;
            }
            const [newState, typeInput] = deduceComposition(e.data || '');
            this._textAreaState = newState;
            this._onType.fire(typeInput);
            // isChrome: the textarea is not updated correctly when composition ends
            // isFirefox: the textarea is not updated correctly after inserting emojis
            // => we cannot assume the text at the end consists only of the composited text
            if (browser.isChrome || browser.isFirefox) {
                this._textAreaState = TextAreaState.readFromTextArea(this._textArea);
            }
            if (!this._isDoingComposition) {
                return;
            }
            this._isDoingComposition = false;
            this._onCompositionEnd.fire();
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'input', () => {
            // Pretend here we touched the text area, as the `input` event will most likely
            // result in a `selectionchange` event which we want to ignore
            this._textArea.setIgnoreSelectionChangeTime('received input event');
            if (this._isDoingComposition) {
                return;
            }
            const [newState, typeInput] = deduceInputFromTextAreaValue(/*couldBeEmojiInput*/ platform.isMacintosh);
            if (typeInput.replaceCharCnt === 0 && typeInput.text.length === 1 && strings.isHighSurrogate(typeInput.text.charCodeAt(0))) {
                // Ignore invalid input but keep it around for next time
                return;
            }
            this._textAreaState = newState;
            if (this._nextCommand === 0 /* Type */) {
                if (typeInput.text !== '') {
                    this._onType.fire(typeInput);
                }
            }
            else {
                if (typeInput.text !== '' || typeInput.replaceCharCnt !== 0) {
                    this._firePaste(typeInput.text, null);
                }
                this._nextCommand = 0 /* Type */;
            }
        }));
        // --- Clipboard operations
        this._register(dom.addDisposableListener(textArea.domNode, 'cut', (e) => {
            // Pretend here we touched the text area, as the `cut` event will most likely
            // result in a `selectionchange` event which we want to ignore
            this._textArea.setIgnoreSelectionChangeTime('received cut event');
            this._ensureClipboardGetsEditorSelection(e);
            this._asyncTriggerCut.schedule();
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'copy', (e) => {
            this._ensureClipboardGetsEditorSelection(e);
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'paste', (e) => {
            // Pretend here we touched the text area, as the `paste` event will most likely
            // result in a `selectionchange` event which we want to ignore
            this._textArea.setIgnoreSelectionChangeTime('received paste event');
            if (ClipboardEventUtils.canUseTextData(e)) {
                const [pastePlainText, metadata] = ClipboardEventUtils.getTextData(e);
                if (pastePlainText !== '') {
                    this._firePaste(pastePlainText, metadata);
                }
            }
            else {
                if (this._textArea.getSelectionStart() !== this._textArea.getSelectionEnd()) {
                    // Clean up the textarea, to get a clean paste
                    this._setAndWriteTextAreaState('paste', TextAreaState.EMPTY);
                }
                this._nextCommand = 1 /* Paste */;
            }
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'focus', () => {
            const hadFocus = this._hasFocus;
            this._setHasFocus(true);
            if (browser.isSafari && !hadFocus && this._hasFocus) {
                // When "tabbing into" the textarea, immediately after dispatching the 'focus' event,
                // Safari will always move the selection at offset 0 in the textarea
                this._asyncFocusGainWriteScreenReaderContent.schedule();
            }
        }));
        this._register(dom.addDisposableListener(textArea.domNode, 'blur', () => {
            if (this._isDoingComposition) {
                // See https://github.com/microsoft/vscode/issues/112621
                // where compositionend is not triggered when the editor
                // is taken off-dom during a composition
                // Clear the flag to be able to write to the textarea
                this._isDoingComposition = false;
                // Clear the textarea to avoid an unwanted cursor type
                this.writeScreenReaderContent('blurWithoutCompositionEnd');
                // Fire artificial composition end
                this._onCompositionEnd.fire();
            }
            this._setHasFocus(false);
        }));
    }
    _installSelectionChangeListener() {
        // See https://github.com/microsoft/vscode/issues/27216 and https://github.com/microsoft/vscode/issues/98256
        // When using a Braille display, it is possible for users to reposition the
        // system caret. This is reflected in Chrome as a `selectionchange` event.
        //
        // The `selectionchange` event appears to be emitted under numerous other circumstances,
        // so it is quite a challenge to distinguish a `selectionchange` coming in from a user
        // using a Braille display from all the other cases.
        //
        // The problems with the `selectionchange` event are:
        //  * the event is emitted when the textarea is focused programmatically -- textarea.focus()
        //  * the event is emitted when the selection is changed in the textarea programmatically -- textarea.setSelectionRange(...)
        //  * the event is emitted when the value of the textarea is changed programmatically -- textarea.value = '...'
        //  * the event is emitted when tabbing into the textarea
        //  * the event is emitted asynchronously (sometimes with a delay as high as a few tens of ms)
        //  * the event sometimes comes in bursts for a single logical textarea operation
        // `selectionchange` events often come multiple times for a single logical change
        // so throttle multiple `selectionchange` events that burst in a short period of time.
        let previousSelectionChangeEventTime = 0;
        return dom.addDisposableListener(document, 'selectionchange', (e) => {
            if (!this._hasFocus) {
                return;
            }
            if (this._isDoingComposition) {
                return;
            }
            if (!browser.isChrome) {
                // Support only for Chrome until testing happens on other browsers
                return;
            }
            const now = Date.now();
            const delta1 = now - previousSelectionChangeEventTime;
            previousSelectionChangeEventTime = now;
            if (delta1 < 5) {
                // received another `selectionchange` event within 5ms of the previous `selectionchange` event
                // => ignore it
                return;
            }
            const delta2 = now - this._textArea.getIgnoreSelectionChangeTime();
            this._textArea.resetSelectionChangeTime();
            if (delta2 < 100) {
                // received a `selectionchange` event within 100ms since we touched the textarea
                // => ignore it, since we caused it
                return;
            }
            if (!this._textAreaState.selectionStartPosition || !this._textAreaState.selectionEndPosition) {
                // Cannot correlate a position in the textarea with a position in the editor...
                return;
            }
            const newValue = this._textArea.getValue();
            if (this._textAreaState.value !== newValue) {
                // Cannot correlate a position in the textarea with a position in the editor...
                return;
            }
            const newSelectionStart = this._textArea.getSelectionStart();
            const newSelectionEnd = this._textArea.getSelectionEnd();
            if (this._textAreaState.selectionStart === newSelectionStart && this._textAreaState.selectionEnd === newSelectionEnd) {
                // Nothing to do...
                return;
            }
            const _newSelectionStartPosition = this._textAreaState.deduceEditorPosition(newSelectionStart);
            const newSelectionStartPosition = this._host.deduceModelPosition(_newSelectionStartPosition[0], _newSelectionStartPosition[1], _newSelectionStartPosition[2]);
            const _newSelectionEndPosition = this._textAreaState.deduceEditorPosition(newSelectionEnd);
            const newSelectionEndPosition = this._host.deduceModelPosition(_newSelectionEndPosition[0], _newSelectionEndPosition[1], _newSelectionEndPosition[2]);
            const newSelection = new Selection(newSelectionStartPosition.lineNumber, newSelectionStartPosition.column, newSelectionEndPosition.lineNumber, newSelectionEndPosition.column);
            this._onSelectionChangeRequest.fire(newSelection);
        });
    }
    dispose() {
        super.dispose();
        if (this._selectionChangeListener) {
            this._selectionChangeListener.dispose();
            this._selectionChangeListener = null;
        }
    }
    focusTextArea() {
        // Setting this._hasFocus and writing the screen reader content
        // will result in a focus() and setSelectionRange() in the textarea
        this._setHasFocus(true);
        // If the editor is off DOM, focus cannot be really set, so let's double check that we have managed to set the focus
        this.refreshFocusState();
    }
    isFocused() {
        return this._hasFocus;
    }
    refreshFocusState() {
        const shadowRoot = dom.getShadowRoot(this.textArea.domNode);
        if (shadowRoot) {
            this._setHasFocus(shadowRoot.activeElement === this.textArea.domNode);
        }
        else if (dom.isInDOM(this.textArea.domNode)) {
            this._setHasFocus(document.activeElement === this.textArea.domNode);
        }
        else {
            this._setHasFocus(false);
        }
    }
    _setHasFocus(newHasFocus) {
        if (this._hasFocus === newHasFocus) {
            // no change
            return;
        }
        this._hasFocus = newHasFocus;
        if (this._selectionChangeListener) {
            this._selectionChangeListener.dispose();
            this._selectionChangeListener = null;
        }
        if (this._hasFocus) {
            this._selectionChangeListener = this._installSelectionChangeListener();
        }
        if (this._hasFocus) {
            this.writeScreenReaderContent('focusgain');
        }
        if (this._hasFocus) {
            this._onFocus.fire();
        }
        else {
            this._onBlur.fire();
        }
    }
    _setAndWriteTextAreaState(reason, textAreaState) {
        if (!this._hasFocus) {
            textAreaState = textAreaState.collapseSelection();
        }
        textAreaState.writeToTextArea(reason, this._textArea, this._hasFocus);
        this._textAreaState = textAreaState;
    }
    writeScreenReaderContent(reason) {
        if (this._isDoingComposition) {
            // Do not write to the text area when doing composition
            return;
        }
        this._setAndWriteTextAreaState(reason, this._host.getScreenReaderContent(this._textAreaState));
    }
    _ensureClipboardGetsEditorSelection(e) {
        const dataToCopy = this._host.getDataToCopy(ClipboardEventUtils.canUseTextData(e) && BrowserFeatures.clipboard.richText);
        const storedMetadata = {
            version: 1,
            isFromEmptySelection: dataToCopy.isFromEmptySelection,
            multicursorText: dataToCopy.multicursorText,
            mode: dataToCopy.mode
        };
        InMemoryClipboardMetadataManager.INSTANCE.set(
        // When writing "LINE\r\n" to the clipboard and then pasting,
        // Firefox pastes "LINE\n", so let's work around this quirk
        (browser.isFirefox ? dataToCopy.text.replace(/\r\n/g, '\n') : dataToCopy.text), storedMetadata);
        if (!ClipboardEventUtils.canUseTextData(e)) {
            // Looks like an old browser. The strategy is to place the text
            // we'd like to be copied to the clipboard in the textarea and select it.
            this._setAndWriteTextAreaState('copy or cut', TextAreaState.selectedText(dataToCopy.text));
            return;
        }
        ClipboardEventUtils.setTextData(e, dataToCopy.text, dataToCopy.html, storedMetadata);
    }
    _firePaste(text, metadata) {
        if (!metadata) {
            // try the in-memory store
            metadata = InMemoryClipboardMetadataManager.INSTANCE.get(text);
        }
        this._onPaste.fire({
            text: text,
            metadata: metadata
        });
    }
}
class ClipboardEventUtils {
    static canUseTextData(e) {
        if (e.clipboardData) {
            return true;
        }
        if (window.clipboardData) {
            return true;
        }
        return false;
    }
    static getTextData(e) {
        if (e.clipboardData) {
            e.preventDefault();
            const text = e.clipboardData.getData('text/plain');
            let metadata = null;
            const rawmetadata = e.clipboardData.getData('vscode-editor-data');
            if (typeof rawmetadata === 'string') {
                try {
                    metadata = JSON.parse(rawmetadata);
                    if (metadata.version !== 1) {
                        metadata = null;
                    }
                }
                catch (err) {
                    // no problem!
                }
            }
            return [text, metadata];
        }
        if (window.clipboardData) {
            e.preventDefault();
            const text = window.clipboardData.getData('Text');
            return [text, null];
        }
        throw new Error('ClipboardEventUtils.getTextData: Cannot use text data!');
    }
    static setTextData(e, text, html, metadata) {
        if (e.clipboardData) {
            e.clipboardData.setData('text/plain', text);
            if (typeof html === 'string') {
                e.clipboardData.setData('text/html', html);
            }
            e.clipboardData.setData('vscode-editor-data', JSON.stringify(metadata));
            e.preventDefault();
            return;
        }
        if (window.clipboardData) {
            window.clipboardData.setData('Text', text);
            e.preventDefault();
            return;
        }
        throw new Error('ClipboardEventUtils.setTextData: Cannot use text data!');
    }
}
class TextAreaWrapper extends Disposable {
    constructor(_textArea) {
        super();
        this._actual = _textArea;
        this._ignoreSelectionChangeTime = 0;
    }
    setIgnoreSelectionChangeTime(reason) {
        this._ignoreSelectionChangeTime = Date.now();
    }
    getIgnoreSelectionChangeTime() {
        return this._ignoreSelectionChangeTime;
    }
    resetSelectionChangeTime() {
        this._ignoreSelectionChangeTime = 0;
    }
    getValue() {
        // console.log('current value: ' + this._textArea.value);
        return this._actual.domNode.value;
    }
    setValue(reason, value) {
        const textArea = this._actual.domNode;
        if (textArea.value === value) {
            // No change
            return;
        }
        // console.log('reason: ' + reason + ', current value: ' + textArea.value + ' => new value: ' + value);
        this.setIgnoreSelectionChangeTime('setValue');
        textArea.value = value;
    }
    getSelectionStart() {
        return this._actual.domNode.selectionStart;
    }
    getSelectionEnd() {
        return this._actual.domNode.selectionEnd;
    }
    setSelectionRange(reason, selectionStart, selectionEnd) {
        const textArea = this._actual.domNode;
        let activeElement = null;
        const shadowRoot = dom.getShadowRoot(textArea);
        if (shadowRoot) {
            activeElement = shadowRoot.activeElement;
        }
        else {
            activeElement = document.activeElement;
        }
        const currentIsFocused = (activeElement === textArea);
        const currentSelectionStart = textArea.selectionStart;
        const currentSelectionEnd = textArea.selectionEnd;
        if (currentIsFocused && currentSelectionStart === selectionStart && currentSelectionEnd === selectionEnd) {
            // No change
            // Firefox iframe bug https://github.com/microsoft/monaco-editor/issues/643#issuecomment-367871377
            if (browser.isFirefox && window.parent !== window) {
                textArea.focus();
            }
            return;
        }
        // console.log('reason: ' + reason + ', setSelectionRange: ' + selectionStart + ' -> ' + selectionEnd);
        if (currentIsFocused) {
            // No need to focus, only need to change the selection range
            this.setIgnoreSelectionChangeTime('setSelectionRange');
            textArea.setSelectionRange(selectionStart, selectionEnd);
            if (browser.isFirefox && window.parent !== window) {
                textArea.focus();
            }
            return;
        }
        // If the focus is outside the textarea, browsers will try really hard to reveal the textarea.
        // Here, we try to undo the browser's desperate reveal.
        try {
            const scrollState = dom.saveParentsScrollTop(textArea);
            this.setIgnoreSelectionChangeTime('setSelectionRange');
            textArea.focus();
            textArea.setSelectionRange(selectionStart, selectionEnd);
            dom.restoreParentsScrollTop(textArea, scrollState);
        }
        catch (e) {
            // Sometimes IE throws when setting selection (e.g. textarea is off-DOM)
        }
    }
}
