from __future__ import annotations

from pathlib import Path

import openpyxl
import pytest

from domain.magicplan.models import (
    Door,
    DoorVentilation,
    Floor,
    Plan,
    Room,
    Window,
    WindowVentilation,
)
from domain.magicplan.ventilation_audit import populate_sheet


def _make_window(with_ventilation: bool = True) -> Window:
    vent = (
        WindowVentilation(
            opening_type="Hinged",
            num_openings=1,
            pct_openable=50,
            trickle_vent_area_mm2=1000,
            num_trickle_vents=2,
        )
        if with_ventilation
        else None
    )
    return Window(width_m=1.0, height_m=1.2, area_m2=1.2, ventilation=vent)


def _make_door(with_ventilation: bool = True) -> Door:
    vent = DoorVentilation(undercut_mm=10.0) if with_ventilation else None
    return Door(width_mm=800.0, height_mm=2000.0, ventilation=vent)


def _make_plan(
    num_rooms: int = 1,
    num_windows_per_room: int = 1,
    num_doors_per_room: int = 1,
) -> Plan:
    rooms = [
        Room(
            name=f"Room {i}",
            width_m=3.0,
            length_m=4.0,
            area_m2=12.0,
            windows=[_make_window() for _ in range(num_windows_per_room)],
            doors=[_make_door() for _ in range(num_doors_per_room)],
        )
        for i in range(num_rooms)
    ]
    return Plan(
        uid="test-uid",
        name="Test Plan",
        address="1 Test St",
        postcode="TE1 1ST",
        floors=[Floor(level=0, name="Ground", rooms=rooms)],
    )


def _blank_sheet() -> object:
    return openpyxl.Workbook().active


def test_raises_when_rooms_exceed_50() -> None:
    # Arrange
    plan = _make_plan(num_rooms=51, num_windows_per_room=0, num_doors_per_room=0)
    sheet = _blank_sheet()

    # Act / Assert
    with pytest.raises(ValueError, match="50"):
        populate_sheet(sheet, plan)


def test_raises_when_windows_exceed_50() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=51, num_doors_per_room=0)
    sheet = _blank_sheet()

    # Act / Assert
    with pytest.raises(ValueError, match="50"):
        populate_sheet(sheet, plan)


def test_raises_when_doors_exceed_50() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=0, num_doors_per_room=51)
    sheet = _blank_sheet()

    # Act / Assert
    with pytest.raises(ValueError, match="50"):
        populate_sheet(sheet, plan)


def test_writes_window_room_name_to_column_F() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=1, num_doors_per_room=0)
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["F6"].value == "Room 0"


def test_writes_window_dimensions_to_columns_G_and_H() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=1, num_doors_per_room=0)
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["G6"].value == 1.0
    assert sheet["H6"].value == 1.2


def test_writes_window_opening_data_to_columns_J_K_L() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=1, num_doors_per_room=0)
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["J6"].value == "Hinged"
    assert sheet["K6"].value == 1
    assert sheet["L6"].value == pytest.approx(0.5)


def test_writes_trickle_vent_data_to_columns_N_and_O() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=1, num_doors_per_room=0)
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["N6"].value == 1000
    assert sheet["O6"].value == 2


def test_writes_door_room_name_to_column_R() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=0, num_doors_per_room=1)
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["R6"].value == "Room 0"


def test_writes_door_dimensions_to_columns_S_and_T() -> None:
    # Arrange
    plan = _make_plan(num_rooms=1, num_windows_per_room=0, num_doors_per_room=1)
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["S6"].value == 800.0
    assert sheet["T6"].value == 10.0


def test_writes_zeros_when_window_has_no_ventilation() -> None:
    # Arrange
    rooms = [Room(name="Room 0", width_m=3.0, length_m=4.0, area_m2=12.0, windows=[_make_window(with_ventilation=False)], doors=[])]
    plan = Plan(uid="u", name="n", address="a", postcode="p", floors=[Floor(level=0, name="G", rooms=rooms)])
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["J6"].value == 0
    assert sheet["K6"].value == 0
    assert sheet["L6"].value == 0
    assert sheet["N6"].value == 0
    assert sheet["O6"].value == 0


def test_writes_zeros_when_door_has_no_ventilation() -> None:
    # Arrange
    rooms = [Room(name="Room 0", width_m=3.0, length_m=4.0, area_m2=12.0, windows=[], doors=[_make_door(with_ventilation=False)])]
    plan = Plan(uid="u", name="n", address="a", postcode="p", floors=[Floor(level=0, name="G", rooms=rooms)])
    sheet = _blank_sheet()

    # Act
    populate_sheet(sheet, plan)

    # Assert
    assert sheet["T6"].value == 0


_TEMPLATE_PATH = (
    Path(__file__).parent.parent.parent.parent
    / "applications"
    / "audit_generator"
    / "Master Sero Template - Data Extraction.xlsx"
)


def test_real_template_survives_18_doors() -> None:
    # Row 23 = DATA_START_ROW(6) + 17 — previously a merged separator that caused
    # AttributeError: 'MergedCell' object attribute 'value' is read-only
    wb = openpyxl.load_workbook(_TEMPLATE_PATH)
    sheet = wb["D1 Ventilation"]
    plan = _make_plan(num_rooms=18, num_windows_per_room=0, num_doors_per_room=1)

    populate_sheet(sheet, plan)

    assert sheet["R23"].value == "Room 17"