"""
Integration tests for installer selection across repository layouts.

Layer order (strongest → weakest):

  OS-PACKAGES  >  NIX  >  PYTHON  >  MAKEFILE
"""

import os
import shutil
import tempfile
import unittest
from collections.abc import Sequence
from unittest.mock import patch

import pkgmgr.actions.install as install_mod
from pkgmgr.actions.install import install_repos
from pkgmgr.actions.install.installers.makefile import MakefileInstaller
from pkgmgr.actions.install.installers.nix import NixFlakeInstaller
from pkgmgr.actions.install.installers.os_packages.arch_pkgbuild import (
    ArchPkgbuildInstaller,
)
from pkgmgr.actions.install.installers.python import PythonInstaller

InstallerSpec = tuple[str, object]


class TestRecursiveCapabilitiesIntegration(unittest.TestCase):
    def setUp(self) -> None:
        self.tmp_root = tempfile.mkdtemp(prefix="pkgmgr-recursive-caps-")
        self.bin_dir = os.path.join(self.tmp_root, "bin")
        os.makedirs(self.bin_dir, exist_ok=True)

    def tearDown(self) -> None:
        shutil.rmtree(self.tmp_root)

    # ------------------------------------------------------------------ helpers

    def _new_repo(self) -> str:
        """
        Create a fresh temporary repo directory under self.tmp_root.
        """
        return tempfile.mkdtemp(prefix="repo-", dir=self.tmp_root)

    def _run_with_installers(
        self,
        repo_dir: str,
        installers: Sequence[InstallerSpec],
        selected_repos=None,
    ) -> list[str]:
        """
        Run install_repos() with a custom INSTALLERS list and capture which
        installer labels actually run.

        We override each installer's supports() to always return True and
        override run() to append its label to called_installers.
        """
        if selected_repos is None:
            repo = {"repository": "dummy"}
            selected_repos = [repo]
            all_repos = [repo]
        else:
            all_repos = selected_repos

        called_installers: list[str] = []

        patched_installers = []
        for label, inst in installers:

            def always_supports(self, ctx):
                return True

            def make_run(label_name: str):
                def _run(self, ctx):
                    called_installers.append(label_name)

                return _run

            inst.supports = always_supports.__get__(inst, inst.__class__)  # type: ignore[assignment]
            inst.run = make_run(label).__get__(inst, inst.__class__)  # type: ignore[assignment]
            patched_installers.append(inst)

        with (
            patch.object(install_mod, "INSTALLERS", patched_installers),
            patch.object(install_mod, "get_repo_identifier", return_value="dummy-repo"),
            patch.object(install_mod, "get_repo_dir", return_value=repo_dir),
            patch.object(
                install_mod, "verify_repository", return_value=(True, [], None, None)
            ),
            patch.object(install_mod, "clone_repos"),
        ):
            install_repos(
                selected_repos=selected_repos,
                repositories_base_dir=self.tmp_root,
                bin_dir=self.bin_dir,
                all_repos=all_repos,
                no_verification=True,
                preview=False,
                quiet=False,
                clone_mode="ssh",
                update_dependencies=False,
            )

        return called_installers

    # ----------------------------------------------------------------- scenarios

    def test_only_makefile_installer_runs(self) -> None:
        """
        With only a Makefile present, only the MakefileInstaller should run.
        """
        repo_dir = self._new_repo()

        with open(os.path.join(repo_dir, "Makefile"), "w", encoding="utf-8") as f:
            f.write("install:\n\t@echo 'make install'\n")

        mk_inst = MakefileInstaller()
        installers: Sequence[InstallerSpec] = [("makefile", mk_inst)]

        called = self._run_with_installers(repo_dir, installers)

        self.assertEqual(
            called,
            ["makefile"],
            "With only a Makefile, the MakefileInstaller should run exactly once.",
        )

    def test_only_the_first_supported_hook_runs(self) -> None:
        """A repository with two usable hooks is installed by the first one."""
        repo_dir = self._new_repo()

        # pyproject.toml without any explicit "make install" hint
        with open(os.path.join(repo_dir, "pyproject.toml"), "w", encoding="utf-8") as f:
            f.write("name = 'dummy'\n")

        with open(os.path.join(repo_dir, "Makefile"), "w", encoding="utf-8") as f:
            f.write("install:\n\t@echo 'make install'\n")

        py_inst = PythonInstaller()
        mk_inst = MakefileInstaller()
        installers: Sequence[InstallerSpec] = [
            ("python", py_inst),
            ("makefile", mk_inst),
        ]

        called = self._run_with_installers(repo_dir, installers)

        self.assertEqual(
            called,
            ["python"],
            "Only the first supported hook may install the repository.",
        )

    def test_python_shadows_makefile_when_pyproject_mentions_make_install(self) -> None:
        """
        If the Python layer advertises a 'make-install' capability (pyproject
        explicitly hints at 'make install'), the Makefile layer must be skipped.
        """
        repo_dir = self._new_repo()

        with open(os.path.join(repo_dir, "pyproject.toml"), "w", encoding="utf-8") as f:
            f.write(
                "name = 'dummy'\n"
                "\n"
                "# Hint for MakeInstallCapability on layer 'python'\n"
                "make install\n"
            )

        with open(os.path.join(repo_dir, "Makefile"), "w", encoding="utf-8") as f:
            f.write("install:\n\t@echo 'make install'\n")

        py_inst = PythonInstaller()
        mk_inst = MakefileInstaller()
        installers: Sequence[InstallerSpec] = [
            ("python", py_inst),
            ("makefile", mk_inst),
        ]

        called = self._run_with_installers(repo_dir, installers)

        self.assertIn("python", called, "PythonInstaller should have run.")
        self.assertNotIn(
            "makefile",
            called,
            "MakefileInstaller should be skipped because its 'make-install' "
            "capability is already provided by Python.",
        )

    def test_nix_shadows_python_and_makefile(self) -> None:
        """
        If a Nix flake advertises both python-runtime and make-install
        capabilities, Python and Makefile installers must be skipped.
        """
        repo_dir = self._new_repo()

        with open(os.path.join(repo_dir, "pyproject.toml"), "w", encoding="utf-8") as f:
            f.write("name = 'dummy'\n")

        with open(os.path.join(repo_dir, "Makefile"), "w", encoding="utf-8") as f:
            f.write("install:\n\t@echo 'make install'\n")

        with open(os.path.join(repo_dir, "flake.nix"), "w", encoding="utf-8") as f:
            f.write(
                '  description = "integration test flake";\n'
                "}\n"
                "\n"
                "# Hint for PythonRuntimeCapability on layer 'nix'\n"
                "buildPythonApplication something\n"
                "\n"
                "# Hint for MakeInstallCapability on layer 'nix'\n"
                "make install\n"
            )

        nix_inst = NixFlakeInstaller()
        py_inst = PythonInstaller()
        mk_inst = MakefileInstaller()
        installers: Sequence[InstallerSpec] = [
            ("nix", nix_inst),
            ("python", py_inst),
            ("makefile", mk_inst),
        ]

        called = self._run_with_installers(repo_dir, installers)

        self.assertIn("nix", called, "NixFlakeInstaller should have run.")
        self.assertNotIn(
            "python",
            called,
            "PythonInstaller should be skipped because its python-runtime "
            "capability is already provided by Nix.",
        )
        self.assertNotIn(
            "makefile",
            called,
            "MakefileInstaller should be skipped because its make-install "
            "capability is already provided by Nix.",
        )

    def test_os_packages_shadow_nix_python_and_makefile(self) -> None:
        """
        If an OS package layer (PKGBUILD) advertises all capabilities,
        all lower layers (Nix, Python, Makefile) must be skipped.
        """
        repo_dir = self._new_repo()

        with open(os.path.join(repo_dir, "pyproject.toml"), "w", encoding="utf-8") as f:
            f.write("name = 'dummy'\n")

        with open(os.path.join(repo_dir, "Makefile"), "w", encoding="utf-8") as f:
            f.write("install:\n\t@echo 'make install'\n")

        with open(os.path.join(repo_dir, "flake.nix"), "w", encoding="utf-8") as f:
            f.write(
                '  description = "integration test flake";\n'
                "}\n"
                "\n"
                "buildPythonApplication something\n"
                "make install\n"
            )

        with open(os.path.join(repo_dir, "PKGBUILD"), "w", encoding="utf-8") as f:
            f.write(
                "pkgver=0.1\n"
                "pkgrel=1\n"
                "pkgdesc='dummy pkg for integration test'\n"
                "arch=('any')\n"
                "source=()\n"
                "sha256sums=()\n"
                "\n"
                "build() {\n"
                "  echo 'build phase'\n"
                "}\n"
                "\n"
                "package() {\n"
                "  echo 'install via pip and make and nix'\n"
                "  pip install .\n"
                "  make install\n"
                "  nix profile list || true\n"
                "}\n"
            )

        os_inst = ArchPkgbuildInstaller()
        nix_inst = NixFlakeInstaller()
        py_inst = PythonInstaller()
        mk_inst = MakefileInstaller()
        installers: Sequence[InstallerSpec] = [
            ("os-packages", os_inst),
            ("nix", nix_inst),
            ("python", py_inst),
            ("makefile", mk_inst),
        ]

        called = self._run_with_installers(repo_dir, installers)

        self.assertIn("os-packages", called, "ArchPkgbuildInstaller should have run.")
        self.assertNotIn(
            "nix",
            called,
            "NixFlakeInstaller should be skipped because all its capabilities "
            "are already provided by os-packages.",
        )
        self.assertNotIn(
            "python",
            called,
            "PythonInstaller should be skipped because python-runtime is already "
            "provided by os-packages.",
        )
        self.assertNotIn(
            "makefile",
            called,
            "MakefileInstaller should be skipped because make-install is already "
            "provided by os-packages.",
        )


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