"""Tests du parseur REG3 sans hypothèse sur les lectures TCP."""

from dataclasses import asdict, replace
from pathlib import Path

import pytest

from custom_components.arkteos.parser import (
    BufferBoundsError,
    FrameHeaderError,
    FrameLengthError,
    filter_values,
    parse_frame,
    parse_frigo_frame,
    parse_metadata_frame,
    parse_regulation_frame,
    read_i8,
    read_i16_le,
    read_u8,
    read_u16_le,
)


FIXTURES_PATH = Path(__file__).with_name("fixtures")
FIXTURE_FILES = {
    95: "metadata_95.bin",
    163: "frigo_163.bin",
    227: "regulation_227.bin",
}


@pytest.fixture(scope="module")
def frames() -> dict[int, bytes]:
    """Charge les exemplaires réels versionnés, indépendamment du flux complet."""

    loaded_frames = {
        size: (FIXTURES_PATH / filename).read_bytes()
        for size, filename in FIXTURE_FILES.items()
    }
    for expected_size, frame in loaded_frames.items():
        assert len(frame) == expected_size
    return loaded_frames


def test_read_u8() -> None:
    assert read_u8(b"\x12", 0) == 18


def test_read_i8_positive() -> None:
    assert read_i8(b"\x7f", 0) == 127


def test_read_i8_negative() -> None:
    assert read_i8(b"\x80", 0) == -128


def test_read_u16_little_endian() -> None:
    assert read_u16_le(b"\x34\x12", 0) == 0x1234


def test_read_i16_little_endian_positive() -> None:
    assert read_i16_le(b"\xff\x7f", 0) == 32767


def test_read_i16_little_endian_negative() -> None:
    assert read_i16_le(b"\x00\x80", 0) == -32768


def test_buffer_overrun_and_short_frame_are_controlled() -> None:
    with pytest.raises(BufferBoundsError):
        read_u16_le(b"\x00", 0)
    with pytest.raises(FrameLengthError):
        parse_frigo_frame(b"\x55\x00")


def test_bad_signature(frames: dict[int, bytes]) -> None:
    frame = bytearray(frames[163])
    frame[0] = 0
    with pytest.raises(FrameHeaderError, match="signature"):
        parse_frame(bytes(frame))


def test_type_and_length_inconsistency(frames: dict[int, bytes]) -> None:
    frame = bytearray(frames[163])
    frame[8] = 0x0B
    with pytest.raises(FrameHeaderError, match="type"):
        parse_frame(bytes(frame))


def test_header_length_inconsistency(frames: dict[int, bytes]) -> None:
    frame = bytearray(frames[227])
    frame[10:12] = (80).to_bytes(2, "little")
    with pytest.raises(FrameHeaderError, match="longueur"):
        parse_frame(bytes(frame))


def test_unknown_frame_length() -> None:
    with pytest.raises(FrameLengthError, match="inconnue"):
        parse_frame(b"\x00" * 96)


def test_parse_real_metadata_frame(frames: dict[int, bytes]) -> None:
    frame = parse_metadata_frame(frames[95])
    assert frame.frame_type == "metadata"


def test_parse_real_frigo_frame(frames: dict[int, bytes]) -> None:
    frame = parse_frigo_frame(frames[163])
    assert frame.frame_type == "frigo"
    assert frame.exterieur_temp == 32.0


def test_parse_real_regulation_frame(frames: dict[int, bytes]) -> None:
    frame = parse_regulation_frame(frames[227])
    assert frame.frame_type == "regulation"
    assert frame.modele_pac_s == "BAGUIO_ZURAN_IV"


def test_values_match_node_red_calculations(frames: dict[int, bytes]) -> None:
    frigo = parse_frigo_frame(frames[163])
    regulation = parse_regulation_frame(frames[227])
    assert frigo.temps_compresseur == 22.4
    assert frigo.nb_cycles_compresseur == 8300
    assert frigo.dc_voltage == 327
    assert regulation.temps_mise_sous_tension == 43
    assert regulation.primaire_temp_eau_aller == 54.9
    assert regulation.ecs_temp_eau_milieu == 60.5
    assert regulation.nb_cycles_compresseur_reg == 7827


def test_filter_keeps_valid_value(frames: dict[int, bytes]) -> None:
    result = filter_values(parse_frigo_frame(frames[163]))
    assert result.accepted["exterieur_temp"] == 32.0
    assert result.rejected == {}


def test_filter_rejects_aberrant_temperature(frames: dict[int, bytes]) -> None:
    frame = replace(parse_frigo_frame(frames[163]), exterieur_temp=150.1)
    result = filter_values(frame)
    assert "exterieur_temp" not in result.accepted
    assert result.rejected["exterieur_temp"] == 150.1


def test_filter_rejects_aberrant_pressure(frames: dict[int, bytes]) -> None:
    frame = replace(parse_regulation_frame(frames[227]), primaire_pression=10.1)
    result = filter_values(frame)
    assert "primaire_pression" not in result.accepted
    assert result.rejected["primaire_pression"] == 10.1


def test_filter_keeps_text_statuses(frames: dict[int, bytes]) -> None:
    frigo_result = filter_values(parse_frigo_frame(frames[163]))
    regulation_result = filter_values(parse_regulation_frame(frames[227]))
    assert frigo_result.accepted["statut_frigo_s"] == "Arret"
    assert regulation_result.accepted["statut_pac_s"] == "Attente"


def test_metadata_has_no_invented_fields(frames: dict[int, bytes]) -> None:
    frame = parse_metadata_frame(frames[95])
    result = filter_values(frame)
    assert asdict(frame) == {"frame_type": "metadata"}
    assert result.accepted == {"frame_type": "metadata"}
    assert result.rejected == {}