from pathlib import Path

from transcriber.merge.aligner import MergedSegment


def write_txt(segments: list[MergedSegment], output_path: str) -> str:
    """Export merged segments as a readable dialogue text file.

    Args:
        segments: List of merged speaker segments.
        output_path: Path to the output .txt file.

    Returns:
        Path to the written file.
    """
    path = Path(output_path)
    path.parent.mkdir(parents=True, exist_ok=True)

    lines = []
    for seg in segments:
        lines.append(f"[{seg.speaker}]")
        lines.append(seg.text)
        lines.append("")

    path.write_text("\n".join(lines), encoding="utf-8")
    return str(path)