from __future__ import annotations

import sys
from pathlib import Path

import pytest

pytest.importorskip("matplotlib")
pytest.importorskip("scipy")
sys.path.insert(0, str(Path(__file__).resolve().parent.parent / "scripts"))

from make_correction_animation import make_animation  # noqa: E402
from PIL import Image  # noqa: E402

from kitti_c2l.assets import generate_sequence_assets
from kitti_c2l.generate import generate_sequence_rows
from kitti_c2l.sequence_mapping import SequenceInfo
from kitti_c2l.stages import STAGES
from kitti_c2l.writer import write_assets, write_split


@pytest.fixture
def demo_data(fake_kitti_root: Path, tmp_path: Path) -> tuple[Path, Path]:
    seq_info = SequenceInfo(sequence="04", date="2011_09_30", drive="0016", start=0, end=3, frame_count=4, split="train")
    metadata_path = tmp_path / "train.parquet"
    write_split(generate_sequence_rows(seq_info, fake_kitti_root, stages=STAGES), metadata_path)
    assets_path = tmp_path / "frames_train.parquet"
    write_assets(generate_sequence_assets(seq_info, fake_kitti_root), assets_path)
    return metadata_path, assets_path


def test_make_animation_writes_a_multi_frame_gif(demo_data: tuple[Path, Path], tmp_path: Path):
    metadata_path, assets_path = demo_data
    output_path = make_animation(
        metadata_path, assets_path, sequence="04", frame=1, stage=1,
        output_path=tmp_path / "anim.gif", num_steps=4, hold_frames=1, fps=10,
    )
    assert output_path.exists()
    with Image.open(output_path) as gif:
        # PIL's GIF encoder dedups identical consecutive hold-frames, so the
        # exact count isn't reliable -- just check it's a genuine animation.
        assert gif.n_frames >= 2
        assert gif.is_animated