# Copyright 2020, New York University and the TUF contributors
# SPDX-License-Identifier: MIT OR Apache-2.0
"""Unit tests for 'examples' scripts."""

from __future__ import annotations

import glob
import os
import shutil
import sys
import tempfile
import unittest
from pathlib import Path
from typing import ClassVar

from tests import utils


class TestRepoExamples(unittest.TestCase):
    """Unit test class for 'manual_repo' scripts.

    Provides a '_run_example_script' method to run (exec) a script located in
    the 'manual_repo' directory.

    """

    repo_examples_dir: ClassVar[Path]

    @classmethod
    def setUpClass(cls) -> None:
        """Locate the example dir."""
        base = Path(__file__).resolve().parents[1]
        cls.repo_examples_dir = base / "examples" / "manual_repo"

    def setUp(self) -> None:
        """Create and change into test dir.
        NOTE: Test scripts are expected to create dirs/files in new CWD."""
        self.original_cwd = os.getcwd()
        self.base_test_dir = os.path.realpath(tempfile.mkdtemp())
        os.chdir(self.base_test_dir)

    def tearDown(self) -> None:
        """Change back to original dir and remove test dir, which may contain
        dirs/files the test created at test-time CWD."""
        os.chdir(self.original_cwd)
        shutil.rmtree(self.base_test_dir)

    def _run_script_and_assert_files(
        self, script_name: str, filenames_created: list[str]
    ) -> None:
        """Run script in example dir and assert that it created the
        files corresponding to the passed filenames inside a 'tmp*' test dir at
        CWD."""
        script_path = str(self.repo_examples_dir / script_name)
        with open(script_path, "rb") as f:
            exec(
                compile(f.read(), script_path, "exec"),
                {"__file__": script_path},
            )

        test_dirs = glob.glob("tmp*")
        self.assertTrue(
            len(test_dirs) == 1, f"expected 1 'tmp*' test dir, got {test_dirs}"
        )

        test_dir = test_dirs.pop()
        for name in filenames_created:
            metadata_path = Path(test_dir) / f"{name}"
            self.assertTrue(
                metadata_path.exists(), f"missing '{metadata_path}' file"
            )

    def test_basic_repo(self) -> None:
        """Run 'basic_repo.py' and assert creation of metadata files."""
        self._run_script_and_assert_files(
            "basic_repo.py",
            [
                "1.python-scripts.json",
                "1.root.json",
                "1.snapshot.json",
                "1.targets.json",
                "2.root.json",
                "2.snapshot.json",
                "2.targets.json",
                "timestamp.json",
            ],
        )

    def test_hashed_bin_delegation(self) -> None:
        """Run 'hashed_bin_delegation.py' and assert creation of metadata files."""
        self._run_script_and_assert_files(
            "hashed_bin_delegation.py",
            [
                "1.bins.json",
                "1.00-07.json",
                "1.08-0f.json",
                "1.10-17.json",
                "1.18-1f.json",
                "1.20-27.json",
                "1.28-2f.json",
                "1.30-37.json",
                "1.38-3f.json",
                "1.40-47.json",
                "1.48-4f.json",
                "1.50-57.json",
                "1.58-5f.json",
                "1.60-67.json",
                "1.68-6f.json",
                "1.70-77.json",
                "1.78-7f.json",
                "1.80-87.json",
                "1.88-8f.json",
                "1.90-97.json",
                "1.98-9f.json",
                "1.a0-a7.json",
                "1.a8-af.json",
                "1.b0-b7.json",
                "1.b8-bf.json",
                "1.c0-c7.json",
                "1.c8-cf.json",
                "1.d0-d7.json",
                "1.d8-df.json",
                "1.e0-e7.json",
                "1.e8-ef.json",
                "1.f0-f7.json",
                "1.f8-ff.json",
            ],
        )

    def test_succinct_hash_bin_delegation(self) -> None:
        self._run_script_and_assert_files(
            "succinct_hash_bin_delegations.py",
            [
                "1.targets.json",
                "1.delegated_bin-00.json",
                "1.delegated_bin-01.json",
                "1.delegated_bin-02.json",
                "1.delegated_bin-03.json",
                "1.delegated_bin-04.json",
                "1.delegated_bin-05.json",
                "1.delegated_bin-06.json",
                "1.delegated_bin-07.json",
                "1.delegated_bin-08.json",
                "1.delegated_bin-09.json",
                "1.delegated_bin-0a.json",
                "1.delegated_bin-0b.json",
                "1.delegated_bin-0c.json",
                "1.delegated_bin-0d.json",
                "1.delegated_bin-0e.json",
                "1.delegated_bin-0f.json",
                "1.delegated_bin-10.json",
                "1.delegated_bin-11.json",
                "1.delegated_bin-12.json",
                "1.delegated_bin-13.json",
                "1.delegated_bin-14.json",
                "1.delegated_bin-15.json",
                "1.delegated_bin-16.json",
                "1.delegated_bin-17.json",
                "1.delegated_bin-18.json",
                "1.delegated_bin-19.json",
                "1.delegated_bin-1a.json",
                "1.delegated_bin-1b.json",
                "1.delegated_bin-1c.json",
                "1.delegated_bin-1d.json",
                "1.delegated_bin-1e.json",
                "1.delegated_bin-1f.json",
            ],
        )


if __name__ == "__main__":
    utils.configure_test_logging(sys.argv)
    unittest.main()