"""Unit-Tests Fixture-Generator (PLAN.md §16.3, §16.4)."""

from __future__ import annotations

import csv
from pathlib import Path

from fixture_generator import LAYER64, MASTER32, write_csv


def test_master32_has_exactly_32_contiguous_channels() -> None:
    assert len(MASTER32) == 32
    assert [row[0] for row in MASTER32] == list(range(1, 33))


def test_layer64_has_exactly_64_contiguous_channels() -> None:
    assert len(LAYER64) == 64
    assert [row[0] for row in LAYER64] == list(range(1, 65))


def test_master32_key_channels_match_plan() -> None:
    by_channel = {row[0]: row for row in MASTER32}
    assert "Blackout" in by_channel[3][1]          # Kanal 3 Blackout
    assert "Preset Recall" in by_channel[8][1]     # Kanal 8 steigende Flanke
    assert "Tap Tempo" in by_channel[16][1]         # Kanal 16 Tap


def test_layer64_key_channels_match_plan() -> None:
    by_channel = {row[0]: row for row in LAYER64}
    assert "Layer Enable" in by_channel[1][1]
    assert "Opacity" in by_channel[2][1]
    assert "Load/Commit" in by_channel[9][1]
    assert "Blend Mode" in by_channel[21][1]
    assert "FX1 Enable" in by_channel[41][1]
    assert "FX2 Enable" in by_channel[52][1]
    assert "Retrigger" in by_channel[63][1]


def test_layer64_fx_parameter_blocks() -> None:
    by_channel = {row[0]: row for row in LAYER64}
    for slot in range(1, 9):
        assert f"P{slot}" in by_channel[43 + slot][1]
        assert f"P{slot}" in by_channel[54 + slot][1]


def test_eight_layers_fit_exactly_one_universe() -> None:
    # §16.2: „Acht Layer entsprechen damit exakt einem DMX-Universe“
    assert 8 * len(LAYER64) == 512


def test_write_csv_output(tmp_path: Path) -> None:
    out = tmp_path / "layer64" / "layer64.csv"
    write_csv(LAYER64, out)
    with open(out, encoding="utf-8", newline="") as fh:
        rows = list(csv.reader(fh))
    assert rows[0] == ["channel", "parameter", "resolution_behavior"]
    assert len(rows) == 65  # Header + 64
    assert rows[1] == ["1", "Layer Enable", "Schalter"]


def test_write_csv_rejects_gaps(tmp_path: Path) -> None:
    import pytest

    broken = [(1, "a", "x"), (3, "b", "y")]  # Kanal 2 fehlt
    with pytest.raises(ValueError, match="contiguous"):
        write_csv(broken, tmp_path / "broken.csv")  # ValueError vor dem Schreiben