import subprocess
import ffmpeg  # todo: remove all references to ffmpeg library and instead use direct subprocesses
from ..render_engines.ffmpeg_engine import FFMPEG


def file_info(path):
    try:
        return ffmpeg.probe(path)
    except Exception as e:
        print('Error getting ffmpeg info: ' + str(e))
    return None


def image_sequence_to_video(source_glob_pattern, output_path, framerate="24", encoder="libx264", pix_fmt="yuv420p"):
    subprocess.run([FFMPEG.renderer_path(), "-framerate", str(framerate), "-i", f"{source_glob_pattern}",
                    "-c:v", encoder, "-pix_fmt", pix_fmt, output_path], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)


def save_first_frame(source_path, dest_path, max_width=1280, run_async=False):
    stream = ffmpeg.input(source_path)
    stream = ffmpeg.output(stream, dest_path, **{'vf': f'format=yuv420p,scale={max_width}:trunc(ow/a/2)*2',
                                                 'vframes': '1'})
    return _run_output(stream, run_async)


def generate_fast_preview(source_path, dest_path, max_width=1280, run_async=False):
    stream = ffmpeg.input(source_path)
    stream = ffmpeg.output(stream, dest_path, **{'vf': 'format=yuv420p,scale={width}:-2'.format(width=max_width),
                                                 'preset': 'ultrafast'})
    return _run_output(stream, run_async)


def generate_thumbnail(source_path, dest_path, max_width=240, run_async=False):
    stream = ffmpeg.input(source_path).video
    stream = ffmpeg.output(stream, dest_path, **{'vf': f'scale={max_width}:trunc(ow/a/2)*2,format=yuv420p',
                                                 'preset': 'veryfast',
                                                 'r': '15',
                                                 'c:v': 'libx265',
                                                 'tag:v': 'hvc1'})
    return _run_output(stream, run_async)


def generate_prores_trim(source_path, dest_path, start_frame, end_frame, handles=10, run_async=False):
    stream = ffmpeg.input(source_path)
    stream = stream.trim(**{'start_frame': max(start_frame-handles, 0), 'end_frame': end_frame + handles})
    stream = stream.setpts('PTS-STARTPTS')  # reset timecode
    stream = ffmpeg.output(stream, dest_path, strict='-2', **{'c:v': 'prores_ks', 'profile:v': 4})
    return _run_output(stream, run_async)


def _run_output(stream, run_async):
    return ffmpeg.run_async(stream, quiet=True, overwrite_output=True) if run_async else \
        ffmpeg.run(stream, quiet=True, overwrite_output=True)


if __name__ == '__main__':
    x = generate_thumbnail("/Users/brett/Desktop/pexels.mp4", "/Users/brett/Desktop/test-output.mp4", max_width=320)
    print(x)