from __future__ import annotations

import io
import sys
import tempfile
import textwrap
import unittest
from contextlib import redirect_stdout
from pathlib import Path
from unittest.mock import patch


# Ensure we import THIS repo's src/ implementation, not an installed site-packages one.
REPO_ROOT = Path(__file__).resolve().parents[1]
SRC_DIR = REPO_ROOT / "src"
sys.path.insert(0, str(SRC_DIR))

from p2pkg.__main__ import main, migrate_one  # noqa: E402


class TestMigration(unittest.TestCase):
    def test_migrate_one_creates_package_and_exports_public_api(self) -> None:
        with tempfile.TemporaryDirectory() as td:
            root = Path(td)
            mod = root / "roles_list.py"
            mod.write_text(
                textwrap.dedent(
                    """\
                    __all__ = ["add", "PUBLIC_CONST"]
                    PUBLIC_CONST = 123
                    _PRIVATE_CONST = 999

                    def add(a: int, b: int) -> int:
                        return a + b

                    def _hidden() -> int:
                        return 1
                    """
                ),
                encoding="utf-8",
            )

            migrate_one(mod, use_git=False, repo_root=root)

            pkg = root / "roles_list"
            self.assertTrue((pkg / "__main__.py").exists())
            self.assertTrue((pkg / "__init__.py").exists())
            self.assertFalse(mod.exists())

            sys.path.insert(0, str(root))
            try:
                import roles_list  # type: ignore

                self.assertTrue(hasattr(roles_list, "add"))
                self.assertEqual(roles_list.add(2, 3), 5)
                self.assertTrue(hasattr(roles_list, "PUBLIC_CONST"))
                self.assertEqual(roles_list.PUBLIC_CONST, 123)

                self.assertEqual(set(roles_list.__all__), {"add", "PUBLIC_CONST"})
                self.assertFalse(hasattr(roles_list, "_hidden"))
            finally:
                sys.path.remove(str(root))
                sys.modules.pop("roles_list", None)

    def test_main_non_recursive_prompts_and_applies_on_yes(self) -> None:
        with tempfile.TemporaryDirectory() as td:
            root = Path(td)
            mod = root / "foo.py"
            mod.write_text("X = 1\n", encoding="utf-8")

            buf = io.StringIO()
            with redirect_stdout(buf), patch("builtins.input", return_value="y"):
                rc = main(["--no-git", "--repo-root", str(root), str(mod)])

            self.assertEqual(rc, 0)
            self.assertFalse(mod.exists())
            self.assertTrue((root / "foo" / "__main__.py").exists())
            self.assertTrue((root / "foo" / "__init__.py").exists())


    def test_main_recursive_preview_does_not_apply_and_does_not_prompt(self) -> None:
        with tempfile.TemporaryDirectory() as td:
            root = Path(td)
            target = root / "tree"
            target.mkdir()

            (target / "x.py").write_text("X = 1\n", encoding="utf-8")
            (target / "y.py").write_text("Y = 2\n", encoding="utf-8")

            buf = io.StringIO()
            with redirect_stdout(buf), patch("builtins.input") as mocked_input:
                rc = main(["-R", "-p", "--no-git", "--repo-root", str(root), str(target)])

            self.assertEqual(rc, 0)
            mocked_input.assert_not_called()
            self.assertTrue((target / "x.py").exists())
            self.assertTrue((target / "y.py").exists())
            self.assertFalse((target / "x").exists())
            self.assertFalse((target / "y").exists())

    def test_main_recursive_force_applies_without_prompt(self) -> None:
        with tempfile.TemporaryDirectory() as td:
            root = Path(td)
            target = root / "tree"
            target.mkdir()

            (target / "x.py").write_text("X = 1\n", encoding="utf-8")
            (target / "y.py").write_text("Y = 2\n", encoding="utf-8")

            buf = io.StringIO()
            with redirect_stdout(buf), patch("builtins.input") as mocked_input:
                rc = main(["-R", "-f", "--no-git", "--repo-root", str(root), str(target)])

            self.assertEqual(rc, 0)
            mocked_input.assert_not_called()
            self.assertFalse((target / "x.py").exists())
            self.assertFalse((target / "y.py").exists())
            self.assertTrue((target / "x" / "__main__.py").exists())
            self.assertTrue((target / "y" / "__main__.py").exists())

    def test_main_recursive_prompts_and_aborts_on_no(self) -> None:
        with tempfile.TemporaryDirectory() as td:
            root = Path(td)
            target = root / "tree"
            target.mkdir()

            (target / "x.py").write_text("X = 1\n", encoding="utf-8")

            buf = io.StringIO()
            with redirect_stdout(buf), patch("builtins.input", return_value="n"):
                rc = main(["-R", "--no-git", "--repo-root", str(root), str(target)])

            self.assertEqual(rc, 1)
            self.assertTrue((target / "x.py").exists())
            self.assertFalse((target / "x").exists())

    def test_main_recursive_prompts_and_applies_on_yes(self) -> None:
        with tempfile.TemporaryDirectory() as td:
            root = Path(td)
            target = root / "tree"
            target.mkdir()

            (target / "x.py").write_text("X = 1\n", encoding="utf-8")
            (target / "y.py").write_text("Y = 2\n", encoding="utf-8")

            buf = io.StringIO()
            with redirect_stdout(buf), patch("builtins.input", return_value="y"):
                rc = main(["-R", "--no-git", "--repo-root", str(root), str(target)])

            self.assertEqual(rc, 0)
            self.assertFalse((target / "x.py").exists())
            self.assertFalse((target / "y.py").exists())
            self.assertTrue((target / "x" / "__main__.py").exists())
            self.assertTrue((target / "y" / "__main__.py").exists())


if __name__ == "__main__":
    unittest.main(verbosity=2)