#!/usr/bin/env python3
from argparse import ArgumentParser, Namespace
from pathlib import Path
from natsort import natsorted
import numpy as np
import pandas as pd
from vre import VRE
from vre.utils import FFmpegVideo, FakeVideo, image_read
from vre.representations import build_representations_from_cfg
from vre.logger import vre_logger as logger
from omegaconf import OmegaConf

import imp

def get_args() -> Namespace:
    """cli args"""
    parser = ArgumentParser()
    parser.add_argument("video_path", help="Path to the scene video we are processing")
    parser.add_argument("--output_path", "-o", required=True,
                        help="Path to the output directory where representations are stored")
    parser.add_argument("--cfg_path", required=True, help="Path to global YAML cfg file")
    parser.add_argument("--representations", nargs="+", help="Subset of representations to run VRE for")
    # run parameters
    parser.add_argument("--start_frame", type=int, default=0, help="The first frame. If not set, defaults to first.")
    parser.add_argument("--end_frame", type=int, help="End frame. If not set, defaults to length of video")
    parser.add_argument("--output_dir_exists_mode", choices=["overwrite", "skip_computed", "raise"])
    parser.add_argument("--n_threads_data_storer", type=int, default=0)
    # other parameters
    parser.add_argument("--frame_rate", type=float, default=-1, help="For a dir of images. Required for optical flow")
    parser.add_argument("--make_video_collage", action="store_true")
    parser.add_argument("--collage_fps", type=float)

    args = parser.parse_args()
    args.video_path = Path(args.video_path).absolute()
    args.output_path = Path(args.output_path).absolute()
    args.cfg_path = Path(args.cfg_path).absolute()
    if args.make_video_collage:
        assert args.collage_fps is not None and args.collage_fps > 0, args.collage_fps
    return args

def main(args: Namespace):
    """Za main function"""
    cfg = OmegaConf.load(open(args.cfg_path, "r"))
    if args.representations is not None:
        assert (d := set(args.representations).difference(r := cfg.representations.keys())) == set(), f"{d} not in {r}"
        logger.info(f"Keeping only {args.representations} from the config")
        cfg.representations = {k: v for k, v in cfg.representations.items() if k in args.representations}

    if args.video_path.is_dir():
        raw_data = [image_read(f) for f in natsorted(args.video_path.glob("*.png"), key=lambda p: p.name)]
        assert all(x.shape == raw_data[0].shape for x in raw_data), f"Images shape differ in '{args.video_path}'"
        logger.info(f"--video_path is a directory. Assuming a directory of images. Found {len(raw_data)} images.")
        video = FakeVideo(np.array(raw_data, dtype=np.uint8), fps=args.fps)
    else:
        video = FFmpegVideo(args.video_path)

    representations = build_representations_from_cfg(cfg=cfg)
    vre = VRE(video, representations)
    vre_metadata = vre.run(args.output_path, frames=list(range(args.start_frame, args.end_frame or len(video))),
                           output_dir_exists_mode=args.output_dir_exists_mode,
                           n_threads_data_storer=args.n_threads_data_storer)
    vre_run_stats = pd.DataFrame(vre_metadata["run_stats"], index=vre_metadata["runtime_args"]["frames"])
    print(vre_run_stats if len(vre_run_stats) > 1 else vre_run_stats.T)

    if args.make_video_collage:
        vre_collage = imp.load_source("vre_collage", (Path(__file__).parent / "vre_collage").__str__())
        vre_collage.main(Namespace(vre_export_dir=args.output_path, output_path=args.output_path / "collage",
                                   video=True, fps=args.collage_fps, output_resolution=None))

if __name__ == "__main__":
    main(get_args())
