import os
import sys
import tempfile
import unittest

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
import qr_bridge as qb


class TestTrisToTargetQuads(unittest.TestCase):
    def test_half(self):
        self.assertEqual(qb.tris_to_target_quads(10000), 5000)

    def test_odd_floors(self):
        self.assertEqual(qb.tris_to_target_quads(3), 1)

    def test_at_least_one(self):
        self.assertEqual(qb.tris_to_target_quads(1), 1)
        self.assertEqual(qb.tris_to_target_quads(0), 1)


class TestBuildSettings(unittest.TestCase):
    def _s(self, **kw):
        return qb.build_settings("/i.fbx", "/o.fbx", "/p.txt", 500, **kw)

    def test_core_lines_present(self):
        s = self._s()
        self.assertIn('FileIn="/i.fbx"', s)
        self.assertIn('FileOut="/o.fbx"', s)
        self.assertIn('ProgressFile="/p.txt"', s)
        self.assertIn("TargetQuadCount=500", s)
        self.assertIn("HostApp=Blender", s)
        self.assertTrue(s.endswith("\n"))

    def test_hard_edges_toggle(self):
        self.assertIn("AutoDetectHardEdges=1", self._s(hard_edges=True))
        self.assertIn("AutoDetectHardEdges=0", self._s(hard_edges=False))

    def test_exact_toggle(self):
        self.assertIn("ExactQuadCount=0", self._s(exact=False))
        self.assertIn("ExactQuadCount=1", self._s(exact=True))


class TestParseProgress(unittest.TestCase):
    def test_success(self):
        self.assertEqual(qb.parse_progress("2\n"), ("success", ""))

    def test_error_with_text(self):
        self.assertEqual(qb.parse_progress("-3\n重拓扑失败"), ("error", "重拓扑失败"))

    def test_error_no_text(self):
        self.assertEqual(qb.parse_progress("-3"), ("error", ""))

    def test_running_fraction(self):
        self.assertEqual(qb.parse_progress("0.5"), ("running", ""))

    def test_running_empty(self):
        self.assertEqual(qb.parse_progress(""), ("running", ""))

    def test_running_garbage(self):
        self.assertEqual(qb.parse_progress("abc"), ("running", ""))


class TestFindQrEngine(unittest.TestCase):
    def setUp(self):
        self._env = dict(os.environ)

    def tearDown(self):
        os.environ.clear()
        os.environ.update(self._env)

    def test_env_var_priority(self):
        with tempfile.NamedTemporaryFile(suffix=".exe", delete=False) as f:
            path = f.name
        try:
            os.environ["QR_ENGINE"] = path
            self.assertEqual(qb.find_qr_engine(), path)
        finally:
            os.remove(path)

    def test_missing_returns_none(self):
        os.environ["QR_ENGINE"] = os.path.join(tempfile.gettempdir(), "nope_xremesh.exe")
        os.environ["APPDATA"] = tempfile.mkdtemp()
        self.assertIsNone(qb.find_qr_engine())


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