import * as vscode from 'vscode';

enum LinesAction {
    searchGoogle
}

function searchGoogleLogic(text: string, lines: string[]): void {
    let searchText: string = '';
    if (text.length > 0) {
        searchText = text.trim();
    }
    else if (lines.length > 0) {
        searchText = lines[0].trim();
    }
    else
        return undefined;
    if (searchText != '') {
        vscode.env.openExternal(
            vscode.Uri.parse(`https://www.google.com/search?q=${lines[0].trim()}`)
        )
    }
}

function getLines(textEditor: vscode.TextEditor, startLine: number, endLine: number) {
    let results: string[] = [];
    for (let i = startLine; i <= endLine; i++) {
        results.push(textEditor.document.lineAt(i).text);
    }
    return results;
}

function linesFunction(linesAction: LinesAction): Thenable<boolean> | undefined {
    const textEditor = vscode.window.activeTextEditor;
    if (!textEditor) {
        return undefined;
    }
    let text = '';
    var startLine = 0;
    var endLine = textEditor.document.lineCount - 1;
    const selection = textEditor.selection;
    if (!selection.isEmpty) {
        startLine = selection.start.line;
        endLine = selection.end.line;
        let range = new vscode.Range(selection.start, selection.end)
        text = textEditor.document.getText(range);
    }
    let lines: string[] = getLines(textEditor, startLine, endLine);
    switch (linesAction) {
        case LinesAction.searchGoogle: { searchGoogleLogic(text, lines); break; }
        default: { throw new Error(); }
    }
    return undefined;
}

export const searchGoogle = () => linesFunction(LinesAction.searchGoogle);