/**
 * Wraps the current selection in CodeMirror with the given prefix and suffix.
 */
export function wrapSelection(view: any, prefix: string, suffix: string = prefix) {
    if (!view || view.updateInProgress) return;
    
    const { state } = view;
    view.dispatch(state.changeByRange((range: any) => {
        return {
            changes: [
                {from: range.from, insert: prefix},
                {from: range.to, insert: suffix}
            ],
            range: range.constructor.range(range.from + prefix.length, range.to + prefix.length)
        };
    }));
    view.focus();
}

/**
 * Inserts a prefix at the start of each line in the selection (e.g., for lists or blockquotes).
 */
export function toggleLinePrefix(view: any, prefix: string) {
    if (!view || view.updateInProgress) return;
    
    const { state } = view;
    view.dispatch(state.changeByRange((range: any) => {
        const lines = [];
        for (let pos = range.from; pos <= range.to; ) {
            const line = state.doc.lineAt(pos);
            lines.push(line);
            pos = line.to + 1;
        }
        
        const isAlreadyPrefixed = lines.every(l => l.text.startsWith(prefix));
        const lineChanges = lines.map(l => {
            if (isAlreadyPrefixed) {
                return { from: l.from, to: l.from + prefix.length, insert: '' };
            } else {
                return { from: l.from, insert: prefix };
            }
        });

        const newFrom = range.from + (isAlreadyPrefixed ? -prefix.length : prefix.length);
        const newTo = range.to + (isAlreadyPrefixed ? (-prefix.length * lines.length) : (prefix.length * lines.length));

        return {
            changes: lineChanges,
            range: range.constructor.range(newFrom, Math.max(newFrom, newTo))
        };
    }));
    view.focus();
}