import ast
from pathlib import Path
import unittest


APP_PATH = Path(__file__).resolve().parents[1] / "app.py"


def _render_matrix_source() -> str:
    source = APP_PATH.read_text(encoding="utf-8")
    tree = ast.parse(source)
    for node in ast.walk(tree):
        if isinstance(node, ast.FunctionDef) and node.name == "render_matrix":
            return ast.get_source_segment(source, node) or ""
    raise AssertionError("render_matrix not found")


class MatrixRenderingStaticTest(unittest.TestCase):
    def test_render_matrix_uses_dynamic_contrast_helpers(self) -> None:
        source = _render_matrix_source()

        self.assertIn("matrix_color_domain", source)
        self.assertIn("matrix_color_ticks", source)
        self.assertIn("matrix_text_colors", source)
        self.assertIn("zmin=zmin", source)
        self.assertIn("zmax=zmax", source)
        self.assertIn("annotations=annotations", source)
        self.assertIn("font=dict(size=12, color=text_colors", source)
        self.assertNotIn("[zmin, 0.5, zmax]", source)
        self.assertNotIn("zmin=0", source)
        self.assertNotIn("zmax=1", source)


if __name__ == "__main__":
    unittest.main()