"""Tests for Tools/fbx_export_preset.py.

The preset module keeps its argument set in plain dicts and builds it in
`preset_kwargs()`, so the export contract can be checked without starting
Blender. Only `export_static`/`export_character` import `bpy`.
"""

import os
import sys
import unittest

ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", ".."))
sys.path.insert(0, os.path.join(ROOT, "Tools"))

import fbx_export_preset as preset  # noqa: E402


class MetricPresetTest(unittest.TestCase):
    def test_scale_and_axis_contract(self):
        # These three are the project's recorded conversion contract: metres ->
        # centimetres by a factor of exactly 100, east +X, north -Y, up +Z.
        kwargs = preset.preset_kwargs()
        self.assertTrue(kwargs["apply_unit_scale"])
        self.assertEqual(kwargs["apply_scale_options"], "FBX_SCALE_NONE")
        self.assertEqual(kwargs["axis_forward"], "-Y")
        self.assertEqual(kwargs["axis_up"], "Z")

    def test_smoothing_groups_are_exported(self):
        # "OFF" (the pre-refactor value) drops smoothing groups and every Unreal
        # import warns about it, with round parts faceted.
        self.assertEqual(preset.preset_kwargs()["mesh_smooth_type"], "FACE")

    def test_selection_flag(self):
        self.assertFalse(preset.preset_kwargs()["use_selection"])
        self.assertTrue(preset.preset_kwargs(selection=True)["use_selection"])

    def test_object_types_are_meshes_only(self):
        self.assertEqual(preset.preset_kwargs()["object_types"], {"MESH"})


class CharacterPresetTest(unittest.TestCase):
    def test_character_exports_armature_and_mesh(self):
        kwargs = preset.preset_kwargs("ue_character_v1")
        self.assertEqual(kwargs["object_types"], {"ARMATURE", "MESH"})
        self.assertFalse(kwargs["add_leaf_bones"])
        self.assertEqual(kwargs["path_mode"], "COPY")
        self.assertFalse(kwargs["embed_textures"])

    def test_character_keeps_the_scale_contract(self):
        kwargs = preset.preset_kwargs("ue_character_v1")
        self.assertEqual(kwargs["apply_scale_options"], "FBX_SCALE_NONE")
        self.assertEqual(kwargs["mesh_smooth_type"], "FACE")


class OverrideTest(unittest.TestCase):
    def test_overrides_win(self):
        kwargs = preset.preset_kwargs(mesh_smooth_type="OFF")
        self.assertEqual(kwargs["mesh_smooth_type"], "OFF")

    def test_unknown_preset_raises(self):
        with self.assertRaises(KeyError):
            preset.preset_kwargs("ue_imperial_v9")

    def test_filepath_must_not_be_an_override(self):
        with self.assertRaises(ValueError):
            preset.preset_kwargs(filepath="/tmp/x.fbx")


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