# generat3D - evaluate Daz DSON scenes and write .dbz files
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import os
import tempfile
import unittest
from pathlib import Path

from generat3d import Error
from generat3d.config import config_path, library_roots


class ConfigTest(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.TemporaryDirectory()
        self.dir = Path(self.tmp.name)
        self.lib = self.dir / "lib"
        self.lib.mkdir()
        self.cfg = self.dir / "config.toml"

    def tearDown(self):
        self.tmp.cleanup()

    def write(self, text):
        self.cfg.write_text(text)

    def test_cli_roots_win_over_config(self):
        self.write('library_roots = ["/nonexistent"]\n')
        self.assertEqual(library_roots([str(self.lib)], self.cfg), [self.lib])

    def test_roots_from_config(self):
        self.write(f'library_roots = ["{self.lib}"]\n')
        self.assertEqual(library_roots([], self.cfg), [self.lib])

    def test_no_roots_anywhere(self):
        with self.assertRaisesRegex(Error, "no library roots"):
            library_roots([], self.cfg)

    def test_missing_root_is_fatal(self):
        with self.assertRaisesRegex(Error, "library root not found"):
            library_roots([str(self.dir / "nope")], self.cfg)

    def test_unknown_key_is_fatal(self):
        self.write(f'library_roots = ["{self.lib}"]\nlibary = 1\n')
        with self.assertRaisesRegex(Error, "unknown keys: libary"):
            library_roots([], self.cfg)

    def test_bad_type_is_fatal(self):
        self.write('library_roots = "/x"\n')
        with self.assertRaisesRegex(Error, "list of strings"):
            library_roots([], self.cfg)

    def test_bad_toml_is_fatal(self):
        self.write("library_roots = [\n")
        with self.assertRaisesRegex(Error, "config.toml"):
            library_roots([], self.cfg)

    def test_xdg_config_home(self):
        old = os.environ.get("XDG_CONFIG_HOME")
        os.environ["XDG_CONFIG_HOME"] = "/tmp/xdg"
        try:
            self.assertEqual(config_path(), Path("/tmp/xdg/generat3d/config.toml"))
        finally:
            if old is None:
                del os.environ["XDG_CONFIG_HOME"]
            else:
                os.environ["XDG_CONFIG_HOME"] = old

    def test_unreadable_config_is_fatal(self):
        self.cfg.mkdir()
        with self.assertRaisesRegex(Error, "config.toml"):
            library_roots([], self.cfg)

    def test_empty_library_root_is_fatal(self):
        with self.assertRaisesRegex(Error, "empty library root"):
            library_roots([""], self.cfg)

    def test_unexpandable_home_is_fatal(self):
        with self.assertRaisesRegex(Error, "cannot expand library root"):
            library_roots(["~nosuchuser_generat3d/lib"], self.cfg)