"""Tests for the audiobook.py CLI — single-book flags and arg validation.

audiobook.py lives at the repo root (one level above app/), so the tests
bootstrap the root onto sys.path to import it. main() runs with the
managed-environment bootstrap stubbed (it would otherwise re-exec the
process into envs/tts) and convert() mocked, asserting only argparse
behavior and what reaches convert(); convert()'s single-book wiring and
the pre-flight overrides are tested against the real functions with
temporary directories.
"""

import contextlib
import io
import shutil
import sys
import tempfile
import unittest
from pathlib import Path
from unittest.mock import MagicMock, patch

# audiobook.py sits at the repo root, two levels above this test module.
REPO_ROOT = Path(__file__).resolve().parents[2]
if str(REPO_ROOT) not in sys.path:
    sys.path.insert(0, str(REPO_ROOT))

import audiobook  # noqa: E402
from converter import config  # noqa: E402
from converter import converter as converter_mod  # noqa: E402
from converter.converter import AudiobookConverter  # noqa: E402


def _make_book(tmp: Path, name: str = "dune.txt") -> Path:
    book = tmp / name
    book.write_text("A beginning is a very delicate time.", encoding="utf-8")
    return book


class MainTestCase(unittest.TestCase):
    """Base: run audiobook.main() with argv, bootstrap stubbed, convert mocked."""

    def setUp(self):
        self.tmp = Path(tempfile.mkdtemp(prefix="audiobook_cli_"))
        self.addCleanup(shutil.rmtree, self.tmp, True)

    def run_main(self, argv):
        """Run main() with the given argv; returns (code, stderr, convert mock).

        The envs bootstrap (which re-execs into the managed venv via
        os.execv when active) and convert() are stubbed, so no TTS work
        happens and the process survives.
        """
        err = io.StringIO()
        convert = MagicMock(return_value=0)
        with patch.object(sys, "argv", ["audiobook.py", *argv]), \
                contextlib.redirect_stderr(err), \
                patch.object(audiobook._envs, "bootstrap"), \
                patch.object(audiobook, "convert", convert):
            try:
                audiobook.main()
                code = None
            except SystemExit as exc:
                code = exc.code
        return code, err.getvalue(), convert


class MainFlagConflictTests(MainTestCase):
    """Mixing the directory and single-book flag pairs stops with an error."""

    def test_input_and_input_file_conflict(self):
        code, err, convert = self.run_main(
            ["--input", str(self.tmp), "--input-file", str(self.tmp / "dune.txt")])
        self.assertEqual(code, 2)
        self.assertIn("--input", err)
        self.assertIn("--input-file", err)
        self.assertIn("cannot be used together", err)
        convert.assert_not_called()

    def test_output_and_output_file_conflict(self):
        code, err, convert = self.run_main(
            ["--output", str(self.tmp / "out"),
             "--output-file", str(self.tmp / "out" / "dune.mp3")])
        self.assertEqual(code, 2)
        self.assertIn("--output", err)
        self.assertIn("--output-file", err)
        self.assertIn("cannot be used together", err)
        convert.assert_not_called()

    def test_output_file_requires_input_file(self):
        code, err, convert = self.run_main(
            ["--output-file", str(self.tmp / "dune.mp3")])
        self.assertEqual(code, 2)
        self.assertIn("--output-file", err)
        self.assertIn("--input-file", err)
        convert.assert_not_called()

    def test_conflict_wins_over_bad_directory(self):
        # The flag explanation fires even when --input is also invalid.
        code, err, convert = self.run_main(
            ["--input", str(self.tmp / "nope"),
             "--input-file", str(self.tmp / "dune.txt")])
        self.assertEqual(code, 2)
        self.assertIn("cannot be used together", err)
        convert.assert_not_called()


class MainPathValidationTests(MainTestCase):
    """--input-file/--output-file values are validated before converting."""

    def test_missing_input_file(self):
        code, err, convert = self.run_main(
            ["--input-file", str(self.tmp / "nope.txt")])
        self.assertEqual(code, 2)
        self.assertIn("no such book file", err)
        convert.assert_not_called()

    def test_unsupported_input_file_format(self):
        book = _make_book(self.tmp, "dune.docx")
        code, err, convert = self.run_main(["--input-file", str(book)])
        self.assertEqual(code, 2)
        self.assertIn("unsupported book format", err)
        self.assertIn(".docx", err)
        convert.assert_not_called()

    def test_output_file_extension_mismatch_stops_the_run(self):
        book = _make_book(self.tmp)
        code, err, convert = self.run_main(
            ["--input-file", str(book),
             "--output-file", str(self.tmp / "dune.mp3"),
             "--format", "m4b"])
        self.assertEqual(code, 2)
        self.assertIn("does not match the output format", err)
        self.assertIn("--format mp3", err)
        convert.assert_not_called()

    def test_output_file_unsupported_extension(self):
        book = _make_book(self.tmp)
        code, err, convert = self.run_main(
            ["--input-file", str(book),
             "--output-file", str(self.tmp / "dune.xyz")])
        self.assertEqual(code, 2)
        self.assertIn("unsupported extension", err)
        convert.assert_not_called()


class MainHappyPathTests(MainTestCase):
    """Valid single-book flags reach convert() resolved and typed."""

    def test_input_and_output_file_forwarded(self):
        book = _make_book(self.tmp)
        target = self.tmp / "out" / "dune.mp3"
        code, _, convert = self.run_main(
            ["--input-file", str(book), "--output-file", str(target),
             "--format", "mp3"])
        self.assertEqual(code, 0)
        convert.assert_called_once()
        kwargs = convert.call_args.kwargs
        self.assertEqual(kwargs["input_file"], book)
        self.assertEqual(kwargs["output_file"], target)
        self.assertEqual(kwargs["output_format"], "mp3")
        self.assertIsNone(kwargs["input_dir"])
        self.assertIsNone(kwargs["output_dir"])

    def test_input_file_alone_keeps_output_defaults(self):
        book = _make_book(self.tmp)
        code, _, convert = self.run_main(["--input-file", str(book)])
        self.assertEqual(code, 0)
        kwargs = convert.call_args.kwargs
        self.assertEqual(kwargs["input_file"], book)
        self.assertIsNone(kwargs["output_file"])
        self.assertEqual(kwargs["output_format"], config.AUDIO_FORMAT)

    def test_directory_flags_still_forwarded(self):
        out = self.tmp / "out"
        code, _, convert = self.run_main(
            ["--input", str(self.tmp), "--output", str(out)])
        self.assertEqual(code, 0)
        kwargs = convert.call_args.kwargs
        self.assertEqual(kwargs["input_dir"], self.tmp)
        self.assertEqual(kwargs["output_dir"], out)
        self.assertIsNone(kwargs["input_file"])
        self.assertIsNone(kwargs["output_file"])


class ConvertWiringTests(unittest.TestCase):
    """convert() turns the single-book flags into the pre-flight overrides."""

    def setUp(self):
        self.tmp = Path(tempfile.mkdtemp(prefix="audiobook_wiring_"))
        self.addCleanup(shutil.rmtree, self.tmp, True)
        self.book = _make_book(self.tmp)
        # convert() repoints the converter module's folder globals; restore
        # them so other tests keep seeing the configured folders.
        self._old_folders = (converter_mod.BOOKS_FOLDER,
                             converter_mod.AUDIOBOOKS_FOLDER)
        self.addCleanup(self._restore_folders)

    def _restore_folders(self):
        converter_mod.BOOKS_FOLDER, converter_mod.AUDIOBOOKS_FOLDER = \
            self._old_folders

    def _convert(self, **kwargs):
        preflight = MagicMock(
            return_value=([self.book], [(self.book, "dune")]))
        fake_instance = MagicMock()
        fake_instance.run.return_value = True
        fake_class = MagicMock(return_value=fake_instance)
        fake_class.preflight_overwrites = preflight
        with patch.object(audiobook, "setup_logging"), \
                patch.object(audiobook, "setup_directories"), \
                patch.object(audiobook, "AudiobookConverter", fake_class):
            code = audiobook.convert(**kwargs)
        return code, preflight, fake_class, fake_instance

    def test_output_file_redirects_folder_and_names_the_book(self):
        out = self.tmp / "out"
        code, preflight, _, fake_instance = self._convert(
            input_file=self.book, output_file=out / "dune.mp3",
            output_format="mp3")
        self.assertEqual(code, 0)
        self.assertEqual(converter_mod.AUDIOBOOKS_FOLDER, out)
        self.assertEqual(preflight.call_args.kwargs["book_files"], [self.book])
        self.assertEqual(preflight.call_args.kwargs["output_name"], "dune")
        self.assertEqual(fake_instance._book_files, [self.book])
        self.assertEqual(fake_instance._planned, [(self.book, "dune")])

    def test_output_file_without_extension_uses_stem(self):
        out = self.tmp / "out"
        _, preflight, _, _ = self._convert(
            input_file=self.book, output_file=out / "dune")
        self.assertEqual(preflight.call_args.kwargs["output_name"], "dune")

    def test_input_file_alone_keeps_output_folder_and_tagged_name(self):
        _, preflight, _, _ = self._convert(input_file=self.book)
        self.assertEqual(preflight.call_args.kwargs["book_files"],
                         [self.book])
        self.assertIsNone(preflight.call_args.kwargs["output_name"])
        self.assertEqual(
            converter_mod.AUDIOBOOKS_FOLDER,
            converter_mod.resolve_dir(config.OUTPUT_DIR, "output"))

    def test_output_file_requires_input_file(self):
        with self.assertRaises(ValueError):
            self._convert(output_file=self.tmp / "dune.mp3")


class PreflightOverrideTests(unittest.TestCase):
    """preflight_overwrites honors the explicit book list and output name."""

    def setUp(self):
        self.tmp = Path(tempfile.mkdtemp(prefix="audiobook_preflight_"))
        self.addCleanup(shutil.rmtree, self.tmp, True)
        self.book = _make_book(self.tmp)
        # The overwrite check globs AUDIOBOOKS_FOLDER; point it at the
        # temporary folder so the repo's real output dir stays untouched.
        patcher = patch.object(converter_mod, "AUDIOBOOKS_FOLDER", self.tmp)
        patcher.start()
        self.addCleanup(patcher.stop)

    def _preflight(self, **kwargs):
        options = dict(backend="audiocpp", voice="Vivian",
                       voice_mode="custom", voice_clone_ref_audio=None,
                       output_format="mp3")
        options.update(kwargs)
        return AudiobookConverter.preflight_overwrites(**options)

    def test_explicit_book_and_output_name_used_verbatim(self):
        book_files, planned = self._preflight(book_files=[self.book],
                                              output_name="dune")
        self.assertEqual(book_files, [self.book])
        self.assertEqual(planned, [(self.book, "dune")])

    def test_explicit_output_name_skips_narrator_tag(self):
        _, planned = self._preflight(book_files=[self.book],
                                     output_name="dune")
        # A directory scan would append the narrator tag (dune_Vivian).
        self.assertNotIn("Vivian", planned[0][1])

    def test_unsupported_books_filtered_from_explicit_list(self):
        stray = self.tmp / "notes.docx"
        stray.write_text("nope", encoding="utf-8")
        book_files, planned = self._preflight(
            book_files=[self.book, stray], output_name="dune")
        self.assertEqual(book_files, [self.book])
        self.assertEqual(planned, [(self.book, "dune")])

    def test_declined_overwrite_yields_empty_planned(self):
        existing = self.tmp / "dune.mp3"
        existing.write_bytes(b"prior audio")
        with patch.object(converter_mod, "prompt_overwrite",
                          return_value=False):
            book_files, planned = self._preflight(book_files=[self.book],
                                                  output_name="dune")
        self.assertEqual(book_files, [self.book])
        self.assertEqual(planned, [])

    def test_accepted_overwrite_plans_the_book(self):
        existing = self.tmp / "dune.mp3"
        existing.write_bytes(b"prior audio")
        with patch.object(converter_mod, "prompt_overwrite",
                          return_value=True):
            book_files, planned = self._preflight(book_files=[self.book],
                                                  output_name="dune")
        self.assertEqual(planned, [(self.book, "dune")])

    def test_empty_explicit_list_nothing_to_convert(self):
        book_files, planned = self._preflight(book_files=[],
                                              output_name="dune")
        self.assertEqual((book_files, planned), ([], []))


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