scripts/edit_video.py

# ============================
# get_footage.py  (unchanged)
# ============================

# (contenu identique à la précédente version – pas de modification)

# ============================
# edit_video.py (révision => musique optionnelle et volume paramétrable)
# ============================

"""Assemble la voix IA et, si fourni, la musique de fond.

Appel :
    edit_video(
        video_path="./assets/video_music/video_silent.mp4",
        audio_path="./assets/audio/voice.mp3",
        music_path=None,          # ou chemin .mp3 / .wav
        output_path="./assets/output/final_video.mp4",
        music_volume=0.10,        # volume musique (0‑1)
    )
"""

from moviepy import VideoFileClip, AudioFileClip, CompositeAudioClip
import os


def edit_video(
    video_path: str,
    audio_path: str,
    music_path: str | None,
    output_path: str,
    *,
    music_volume: float = 0.10,
):
    video_clip = VideoFileClip(video_path)
    voice_clip = AudioFileClip(audio_path)
    tracks = [voice_clip]

    if music_path and os.path.isfile(music_path):
        try:
            music_clip = (
                AudioFileClip(music_path)
                .with_volume_scaled(music_volume)
                .with_duration(video_clip.duration)
            )
            tracks.insert(0, music_clip)
        except Exception as err:
            print(f"⚠️ Musique ignorée : {err}")

    final_audio = CompositeAudioClip(tracks).with_duration(video_clip.duration)
    final_clip = video_clip.with_audio(final_audio)

    final_clip.write_videofile(
        output_path,
        codec="libx264",
        audio_codec="aac",
        fps=30,
        threads=4,
        preset="medium",
        ffmpeg_params=["-pix_fmt", "yuv420p"],
    )
    print(f"✅ Vidéo générée : {output_path}")

    video_clip.close()
    voice_clip.close()
    if "music_clip" in locals():
        music_clip.close()
    final_audio.close()
    final_clip.close()