def align_segments(
    whisper_segs: list[dict],
    speaker_segs: list[tuple[float, float, str]],
) -> list[tuple[str, str]]:
    """Assign each Whisper segment to the speaker with the greatest time overlap.
    Consecutive segments from the same speaker are merged into one block."""
    result: list[tuple[str, str]] = []
    for seg in whisper_segs:
        speaker = _best_speaker(seg["start"], seg["end"], speaker_segs)
        text = seg["text"].strip()
        if not text:
            continue
        if result and result[-1][0] == speaker:
            result[-1] = (speaker, result[-1][1] + " " + text)
        else:
            result.append((speaker, text))
    return result


def _best_speaker(
    start: float,
    end: float,
    speaker_segs: list[tuple[float, float, str]],
) -> str:
    best_label = "SPEAKER_00"
    best_overlap = 0.0
    for s_start, s_end, label in speaker_segs:
        overlap = max(0.0, min(end, s_end) - max(start, s_start))
        if overlap > best_overlap:
            best_overlap = overlap
            best_label = label
    return best_label