from __future__ import annotations

import tempfile
import unittest
from pathlib import Path

from sjnetpkg import config, package


def write_package(root: Path, directory: str, manifest: str) -> Path:
    target = root / directory
    target.mkdir(parents=True, exist_ok=True)
    (target / "sjnetpkg.toml").write_text(manifest, encoding="utf-8")
    return target


class ValidNameTests(unittest.TestCase):
    def test_valid_names(self) -> None:
        for name in ("cool-tool", "a", "tool_2", "tool.py", "A1"):
            self.assertTrue(package.is_valid_name(name), name)

    def test_invalid_names(self) -> None:
        for name in ("", ".", "..", "-tool", "tool-", "bad name", "../escape", "a/b"):
            self.assertFalse(package.is_valid_name(name), name)


class ManifestTests(unittest.TestCase):
    def setUp(self) -> None:
        self._tmp = tempfile.TemporaryDirectory()
        self.root = Path(self._tmp.name)

    def tearDown(self) -> None:
        self._tmp.cleanup()

    def test_reads_name_version_and_run_command(self) -> None:
        directory = write_package(
            self.root,
            "cool-tool",
            'name = "cool-tool"\nversion = "1.0.0"\n\n[run]\ncommand = "cargo run"\n',
        )
        manifest = package.read_manifest(directory)
        self.assertEqual(manifest.name, "cool-tool")
        self.assertEqual(manifest.version, "1.0.0")
        self.assertEqual(manifest.run_command, "cargo run")
        self.assertEqual(manifest.path, directory)

    def test_run_section_is_optional(self) -> None:
        directory = write_package(
            self.root, "lib", 'name = "lib"\nversion = "0.1.0"\n'
        )
        self.assertIsNone(package.read_manifest(directory).run_command)

    def test_missing_manifest_raises(self) -> None:
        directory = self.root / "empty"
        directory.mkdir()
        with self.assertRaises(package.PackageError):
            package.read_manifest(directory)

    def test_invalid_toml_raises(self) -> None:
        directory = write_package(self.root, "broken", "name = = \n")
        with self.assertRaises(package.PackageError):
            package.read_manifest(directory)

    def test_missing_name_raises(self) -> None:
        directory = write_package(self.root, "noname", 'version = "1.0.0"\n')
        with self.assertRaises(package.PackageError):
            package.read_manifest(directory)

    def test_missing_version_raises(self) -> None:
        directory = write_package(self.root, "noversion", 'name = "noversion"\n')
        with self.assertRaises(package.PackageError):
            package.read_manifest(directory)

    def test_invalid_name_raises(self) -> None:
        directory = write_package(
            self.root, "bad", 'name = "../escape"\nversion = "1.0.0"\n'
        )
        with self.assertRaises(package.PackageError):
            package.read_manifest(directory)


class InstalledPackagesTests(unittest.TestCase):
    def setUp(self) -> None:
        self._tmp = tempfile.TemporaryDirectory()
        self.paths = config.get_paths(Path(self._tmp.name) / ".sjnetpkg")
        self.paths.pkg.mkdir(parents=True)

    def tearDown(self) -> None:
        self._tmp.cleanup()

    def test_list_is_empty_without_packages_directory(self) -> None:
        self.assertEqual(package.list_installed(config.get_paths(self.paths.home / "x")), [])

    def test_list_ignores_invalid_and_non_directory_entries(self) -> None:
        write_package(self.paths.pkg, "cool-tool", 'name = "cool-tool"\nversion = "1.0.0"\n')
        write_package(self.paths.pkg, "broken", "nonsense")
        (self.paths.pkg / "loose-file").write_text("hello")
        names = [m.name for m in package.list_installed(self.paths)]
        self.assertEqual(names, ["cool-tool"])

    def test_find_installed_by_directory_name(self) -> None:
        directory = write_package(
            self.paths.pkg, "repo-name", 'name = "manifest-name"\nversion = "1.0.0"\n'
        )
        self.assertEqual(package.find_installed(self.paths, "repo-name"), directory)

    def test_find_installed_by_manifest_name(self) -> None:
        directory = write_package(
            self.paths.pkg, "repo-name", 'name = "manifest-name"\nversion = "1.0.0"\n'
        )
        self.assertEqual(package.find_installed(self.paths, "manifest-name"), directory)

    def test_find_installed_unknown_raises(self) -> None:
        with self.assertRaises(package.NotInstalledError):
            package.find_installed(self.paths, "missing")

    def test_remove_package(self) -> None:
        directory = write_package(self.paths.pkg, "cool-tool", 'name = "cool-tool"\nversion = "1.0.0"\n')
        self.assertEqual(package.remove_package(self.paths, "cool-tool"), directory)
        self.assertFalse(directory.exists())

    def test_remove_missing_package_raises(self) -> None:
        with self.assertRaises(package.NotInstalledError):
            package.remove_package(self.paths, "missing")

    def test_remove_refuses_to_leave_package_directory(self) -> None:
        outside = Path(self._tmp.name) / "outside"
        outside.mkdir()
        link = self.paths.pkg / "link"
        try:
            link.symlink_to(outside, target_is_directory=True)
        except (OSError, NotImplementedError):  # pragma: no cover - platform dependent
            self.skipTest("symlinks are not supported on this platform")
        with self.assertRaises(package.PackageError):
            package.remove_package(self.paths, "link")
        self.assertTrue(outside.exists())


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