'use strict';

import * as vsc from 'vscode';
import * as ext from './Extension';
import * as xpath from 'xpath';
import { RangeUtil } from './utils/RangeUtil';
import { XmlFormatter } from './services/XmlFormatter';
import { XPathFeatureProvider } from './providers/XPath';
import { XQueryExecutionProvider } from './providers/Execution';
import { XmlTreeDocumentContentProvider } from './providers/Content';
import { XmlFormattingEditProvider } from './providers/Formatting';

const CFG_SECTION: string = 'xmlTools';
const CFG_REMOVE_COMMENTS: string = 'removeCommentsOnMinify';

export class TextEditorCommands {
    static minifyXml(editor: vsc.TextEditor, edit: vsc.TextEditorEdit): void {
        let removeComments: boolean = vsc.workspace.getConfiguration(CFG_SECTION).get<boolean>(CFG_REMOVE_COMMENTS, false);
        
        let range: vsc.Range = RangeUtil.getRangeForDocument(editor.document);
        
        let formatter: XmlFormatter = new XmlFormatter();
        let xml: string = formatter.minify(editor.document.getText());
        
        edit.replace(range, xml);
    }
    
    static evaluateXPath(editor: vsc.TextEditor, edit: vsc.TextEditorEdit): void {
        XPathFeatureProvider.evaluateXPathAsync(editor, edit);
    }
    
    static executeXQuery(editor: vsc.TextEditor, edit: vsc.TextEditorEdit): void {
        XQueryExecutionProvider.executeXQueryAsync(editor);
    }
    
    static async viewXmlTree(editor: vsc.TextEditor, edit: vsc.TextEditorEdit): Promise<void> {
        try {
            await vsc.commands.executeCommand(
                'vscode.previewHtml',
                XmlTreeDocumentContentProvider.buildUri(editor.document.uri),
                vsc.ViewColumn.Three);
        }
        
        catch (error) {
            vsc.window.showErrorMessage(`The XML Tree could not be created: ${error}`);
        }
    }

    static formatAsXml(editor: vsc.TextEditor, edit: vsc.TextEditorEdit): void {
        let edits: vsc.TextEdit[];
        let formattingEditProvider = new XmlFormattingEditProvider();
        let formattingOptions: vsc.FormattingOptions = {
            insertSpaces: editor.options.insertSpaces,
            tabSize: editor.options.tabSize
        };
        
        // if the user has selected text, only format what is selected
        // otherwise, attempt to format the entire document
        if (!editor.selection.isEmpty) {
            edits = formattingEditProvider.provideDocumentRangeFormattingEdits(editor.document, editor.selection, formattingOptions); 
        }

        else {
            edits = formattingEditProvider.provideDocumentFormattingEdits(editor.document, formattingOptions);
        }

        if (edits) {
            for (let i = 0; i < edits.length; i++) {
                editor.edit(async (editBuilder) => {
                    editBuilder.replace(edits[i].range, edits[i].newText);

                    // wiggle the cursor to deselect the formatted XML (is there a non-hacky way to go about this?)
                    await vsc.commands.executeCommand('cursorMove', {
                        to: 'left',
                        by: 'character'
                    });
                    await vsc.commands.executeCommand('cursorMove', {
                        to: 'right',
                        by: 'character'
                    });
                });
            }
        }
    }
}