from pathlib import Path
from typing import cast
import numpy
import pytest
from numpy.testing import assert_equal, assert_allclose

from ..error import LibraryError
from ..pattern import Pattern
from ..library import Library
from ..file import gdsii
from ..shapes import Path as MPath, Polygon


def test_gdsii_roundtrip(tmp_path: Path) -> None:
    lib = Library()

    # Simple polygon cell
    pat1 = Pattern()
    pat1.polygon((1, 0), vertices=[[0, 0], [10, 0], [10, 10], [0, 10]])
    lib["poly_cell"] = pat1

    # Path cell
    pat2 = Pattern()
    pat2.path((2, 5), vertices=[[0, 0], [100, 0]], width=10)
    lib["path_cell"] = pat2

    # Cell with Ref
    pat3 = Pattern()
    pat3.ref("poly_cell", offset=(50, 50), rotation=numpy.pi / 2)
    lib["ref_cell"] = pat3

    gds_file = tmp_path / "test.gds"
    gdsii.writefile(lib, gds_file, meters_per_unit=1e-9)

    read_lib, info = gdsii.readfile(gds_file)

    assert "poly_cell" in read_lib
    assert "path_cell" in read_lib
    assert "ref_cell" in read_lib

    # Check polygon
    read_poly = cast("Polygon", read_lib["poly_cell"].shapes[(1, 0)][0])
    # GDSII closes polygons, so it might have an extra vertex or different order
    assert len(read_poly.vertices) >= 4
    # Check bounds as a proxy for geometry correctness
    assert_equal(read_lib["poly_cell"].get_bounds(), [[0, 0], [10, 10]])

    # Check path
    read_path = cast("MPath", read_lib["path_cell"].shapes[(2, 5)][0])
    assert isinstance(read_path, MPath)
    assert read_path.width == 10
    assert_equal(read_path.vertices, [[0, 0], [100, 0]])

    # Check Ref
    read_ref = read_lib["ref_cell"].refs["poly_cell"][0]
    assert_equal(read_ref.offset, [50, 50])
    assert_allclose(read_ref.rotation, numpy.pi / 2, atol=1e-5)


def test_gdsii_annotations(tmp_path: Path) -> None:
    lib = Library()
    pat = Pattern()
    # GDS only supports integer keys in range [1, 126] for properties
    pat.polygon((1, 0), vertices=[[0, 0], [1, 0], [1, 1]], annotations={"1": ["hello"]})
    lib["cell"] = pat

    gds_file = tmp_path / "test_ann.gds"
    gdsii.writefile(lib, gds_file, meters_per_unit=1e-9)

    read_lib, _ = gdsii.readfile(gds_file)
    read_ann = read_lib["cell"].shapes[(1, 0)][0].annotations
    assert read_ann is not None
    assert read_ann["1"] == ["hello"]


def test_gdsii_check_valid_names_validates_generator_lengths() -> None:
    names = (name for name in ("a" * 40,))

    with pytest.raises(LibraryError, match="invalid names"):
        gdsii.check_valid_names(names)