from __future__ import annotations

import pytest

from kitti_c2l.sequence_mapping import (
    ALL_SEQUENCES,
    AVAILABLE_SEQUENCES,
    TEST_SEQUENCES,
    TRAIN_SEQUENCES,
    load_sequence_mapping,
)


def test_all_eleven_sequences_present():
    mapping = load_sequence_mapping()
    assert set(mapping.keys()) == {f"{i:02d}" for i in range(11)}


def test_frame_count_matches_start_end():
    mapping = load_sequence_mapping()
    for seq_info in mapping.values():
        assert seq_info.frame_count == seq_info.end - seq_info.start + 1


def test_split_assignment_matches_field_standard_protocol():
    mapping = load_sequence_mapping()
    for seq_id in TRAIN_SEQUENCES:
        assert mapping[seq_id].split == "train"
    for seq_id in TEST_SEQUENCES:
        assert mapping[seq_id].split == "test"
    assert set(TRAIN_SEQUENCES) | set(TEST_SEQUENCES) == set(ALL_SEQUENCES)


def test_raw_frame_index_offset():
    mapping = load_sequence_mapping()
    seq08 = mapping["08"]
    assert seq08.raw_frame_index(0) == seq08.start == 1100
    assert seq08.raw_frame_index(seq08.frame_count - 1) == seq08.end


def test_raw_frame_index_out_of_range_raises():
    mapping = load_sequence_mapping()
    seq04 = mapping["04"]
    with pytest.raises(IndexError):
        seq04.raw_frame_index(seq04.frame_count)


def test_drive_name_format():
    mapping = load_sequence_mapping()
    assert mapping["00"].drive_name == "2011_10_03_drive_0027_sync"


def test_sequence_03_flagged_unavailable():
    """Sequence 03's raw drive 404s on KITTI's official mirror -- see sequence_mapping.yaml."""
    mapping = load_sequence_mapping()
    assert mapping["03"].available is False
    assert "03" not in AVAILABLE_SEQUENCES


def test_available_sequences_are_all_except_03():
    assert set(AVAILABLE_SEQUENCES) == set(ALL_SEQUENCES) - {"03"}
    assert all(load_sequence_mapping()[seq_id].available for seq_id in AVAILABLE_SEQUENCES)