import json

def load_json(filepath):
    with open(filepath, 'r', encoding='utf-8') as f:
        return json.load(f)

def save_json(filepath, data):
    with open(filepath, 'w', encoding='utf-8') as f:
        json.dump(data, f, ensure_ascii=False, indent=2)

def find_speaker(begin_time, end_time, diarization_segments):
    max_overlap = 0
    best_speaker = "SPEAKER_00"

    for seg in diarization_segments:
        seg_begin = seg['begin_time']
        seg_end = seg['end_time']

        overlap_begin = max(begin_time, seg_begin)
        overlap_end = min(end_time, seg_end)

        if overlap_begin < overlap_end:
            overlap_duration = overlap_end - overlap_begin
            if overlap_duration > max_overlap:
                max_overlap = overlap_duration
                best_speaker = seg['speaker']

    return best_speaker