/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import { IndentAction } from './languageConfiguration.js';
import { getIndentationAtPosition, getScopedLineTokens } from './languageConfigurationRegistry.js';
export function getEnterAction(autoIndent, model, range, languageConfigurationService) {
    const scopedLineTokens = getScopedLineTokens(model, range.startLineNumber, range.startColumn);
    const richEditSupport = languageConfigurationService.getLanguageConfiguration(scopedLineTokens.languageId);
    if (!richEditSupport) {
        return null;
    }
    const scopedLineText = scopedLineTokens.getLineContent();
    const beforeEnterText = scopedLineText.substr(0, range.startColumn - 1 - scopedLineTokens.firstCharOffset);
    // selection support
    let afterEnterText;
    if (range.isEmpty()) {
        afterEnterText = scopedLineText.substr(range.startColumn - 1 - scopedLineTokens.firstCharOffset);
    }
    else {
        const endScopedLineTokens = getScopedLineTokens(model, range.endLineNumber, range.endColumn);
        afterEnterText = endScopedLineTokens.getLineContent().substr(range.endColumn - 1 - scopedLineTokens.firstCharOffset);
    }
    let previousLineText = '';
    if (range.startLineNumber > 1 && scopedLineTokens.firstCharOffset === 0) {
        // This is not the first line and the entire line belongs to this mode
        const oneLineAboveScopedLineTokens = getScopedLineTokens(model, range.startLineNumber - 1);
        if (oneLineAboveScopedLineTokens.languageId === scopedLineTokens.languageId) {
            // The line above ends with text belonging to the same mode
            previousLineText = oneLineAboveScopedLineTokens.getLineContent();
        }
    }
    const enterResult = richEditSupport.onEnter(autoIndent, previousLineText, beforeEnterText, afterEnterText);
    if (!enterResult) {
        return null;
    }
    const indentAction = enterResult.indentAction;
    let appendText = enterResult.appendText;
    const removeText = enterResult.removeText || 0;
    // Here we add `\t` to appendText first because enterAction is leveraging appendText and removeText to change indentation.
    if (!appendText) {
        if ((indentAction === IndentAction.Indent) ||
            (indentAction === IndentAction.IndentOutdent)) {
            appendText = '\t';
        }
        else {
            appendText = '';
        }
    }
    else if (indentAction === IndentAction.Indent) {
        appendText = '\t' + appendText;
    }
    let indentation = getIndentationAtPosition(model, range.startLineNumber, range.startColumn);
    if (removeText) {
        indentation = indentation.substring(0, indentation.length - removeText);
    }
    return {
        indentAction: indentAction,
        appendText: appendText,
        removeText: removeText,
        indentation: indentation
    };
}