from __future__ import annotations

import sys
from pathlib import Path

import pytest

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

from visualize_projection import visualize  # noqa: E402

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_split


@pytest.fixture
def demo_parquet(fake_kitti_root: Path, tmp_path: Path) -> Path:
    seq_info = SequenceInfo(sequence="04", date="2011_09_30", drive="0016", start=0, end=3, frame_count=4, split="train")
    rows = generate_sequence_rows(seq_info, fake_kitti_root, stages=STAGES)
    output_path = tmp_path / "train.parquet"
    write_split(rows, output_path)
    return output_path


def test_visualize_all_stages_for_a_frame(fake_kitti_root: Path, demo_parquet: Path, tmp_path: Path):
    output_path = visualize(
        demo_parquet, fake_kitti_root, tmp_path / "overlay.png", sequence="04", frame=1
    )
    assert output_path.exists()
    assert output_path.stat().st_size > 0


def test_visualize_single_stage_by_sample_id(fake_kitti_root: Path, demo_parquet: Path, tmp_path: Path):
    output_path = visualize(
        demo_parquet, fake_kitti_root, tmp_path / "overlay.png", sample_id="04_000002_stage3"
    )
    assert output_path.exists()


def test_visualize_stage_filter(fake_kitti_root: Path, demo_parquet: Path, tmp_path: Path):
    output_path = visualize(
        demo_parquet, fake_kitti_root, tmp_path / "overlay.png", sequence="04", frame=0, stages={1, 5}
    )
    assert output_path.exists()


def test_visualize_unknown_sample_id_raises(fake_kitti_root: Path, demo_parquet: Path, tmp_path: Path):
    with pytest.raises(ValueError, match="No row"):
        visualize(demo_parquet, fake_kitti_root, tmp_path / "overlay.png", sample_id="does_not_exist")