const ANSI = /\x1b(?:\[[0-?]*[ -/]*[@-~]|\][^\x07]*(?:\x07|\x1b\\)|_[\s\S]*?\x1b\\)/g;

function isEditorBorder(line: string): boolean {
	const plain = line.replace(ANSI, "");
	return /^─+$/.test(plain) || /^─── [↑↓] \d+ more ─*$/.test(plain);
}

export function addInputPrompt(lines: string[], prompt: string, promptWidth: number, border: string): string[] {
	if (!prompt) return lines;

	const continuation = " ".repeat(promptWidth);
	let renderedPrompt = false;
	return lines.map((line, index) => {
		if (index === 0 || isEditorBorder(line)) return line + border;
		if (!renderedPrompt) {
			renderedPrompt = true;
			return prompt + line;
		}
		return continuation + line;
	});
}