from pathlib import Path
from unittest import mock
from unittest.mock import mock_open, patch

import pytest

from speccpu import SPEC, check_bench_dir, find_build
from speccpu.x264 import recompile_mc_src


class TestFindBuild:
    def test_find_build_success(self, tmpdir):
        # Create a mock directory structure with a build directory
        build_parent = Path(tmpdir)
        build_dir = build_parent / "build_2023"
        build_dir.mkdir()

        # Test that find_build correctly identifies the build directory
        found_dir = find_build(build_parent)
        assert found_dir == build_dir

    def test_find_build_multiple_dirs(self, tmpdir):
        # Create multiple build directories
        build_parent = Path(tmpdir)
        build_dir1 = build_parent / "build_2022"
        build_dir2 = build_parent / "build_2023"
        build_dir1.mkdir()
        build_dir2.mkdir()

        # Should find the alphabetically first one
        found_dir = find_build(build_parent)
        assert found_dir == build_dir1

    def test_find_build_no_dir(self, tmpdir):
        # Test the error case when no build directory exists
        build_parent = Path(tmpdir)
        with pytest.raises(RuntimeError):
            find_build(build_parent)


class TestSPEC:
    def test_init(self):
        spec_dir = Path("/path/to/spec")
        spec = SPEC(spec_dir)
        assert spec.dir == spec_dir

    def test_config_dir(self):
        spec_dir = Path("/path/to/spec")
        spec = SPEC(spec_dir)
        assert spec.config_dir == spec_dir / "config"

    def test_env(self):
        spec_dir = Path("/path/to/spec")
        spec = SPEC(spec_dir)
        with mock.patch("speccpu.create_spec_env") as mock_create_env:
            spec.env()
            mock_create_env.assert_called_once_with(spec_dir)

    def test_mkcmd_runcpu_default(self):
        spec = SPEC(Path("/path/to/spec"))
        cmd = spec.mkcmd_runcpu("myconfig", ["benchmark1", "benchmark2"])
        assert cmd == [
            "runcpu",
            "--setprocgroup",
            "-i",
            "ref",
            "-c",
            "myconfig",
            "benchmark1",
            "benchmark2",
        ]

    def test_mkcmd_runcpu_no_procgroup(self):
        spec = SPEC(Path("/path/to/spec"))
        cmd = spec.mkcmd_runcpu("myconfig", ["benchmark1"], setprocgroup=False)
        assert "--setprocgroup" not in cmd

    def test_mkcmd_runcpu_with_output_dir(self):
        spec = SPEC(Path("/path/to/spec"))
        output_dir = Path("/output/dir")
        cmd = spec.mkcmd_runcpu("myconfig", ["benchmark1"], output_root=output_dir)
        assert "--output_root" in cmd
        assert str(output_dir) in cmd

    def test_mkcmd_runcpu_build_type_default(self):
        """Test that mkcmd_runcpu doesn't add build flags with default build type."""
        spec = SPEC(Path("/path/to/spec"))
        cmd = spec.mkcmd_runcpu(
            "myconfig", ["benchmark1"], build_type=SPEC.BuildType.Default
        )
        assert "--nobuild" not in cmd
        assert "--rebuild" not in cmd

    def test_mkcmd_runcpu_build_type_nobuild(self):
        """Test that mkcmd_runcpu adds --nobuild flag with Nobuild build type."""
        spec = SPEC(Path("/path/to/spec"))
        cmd = spec.mkcmd_runcpu(
            "myconfig", ["benchmark1"], build_type=SPEC.BuildType.Nobuild
        )
        assert "--nobuild" in cmd
        assert "--rebuild" not in cmd

    def test_mkcmd_runcpu_build_type_rebuild(self):
        """Test that mkcmd_runcpu adds --rebuild flag with Rebuild build type."""
        spec = SPEC(Path("/path/to/spec"))
        cmd = spec.mkcmd_runcpu(
            "myconfig", ["benchmark1"], build_type=SPEC.BuildType.Rebuild
        )
        assert "--rebuild" in cmd
        assert "--nobuild" not in cmd


class TestCheckBenchDir:
    def test_valid_bench_dir(self, tmpdir):
        """Test that check_bench_dir returns True for a valid benchmark directory."""
        bench_dir = Path(tmpdir)

        # Create the required subdirectories
        (bench_dir / "build").mkdir()
        (bench_dir / "exe").mkdir()
        (bench_dir / "run").mkdir()

        # Add some extra files/directories to make sure they don't affect the result
        (bench_dir / "other_dir").mkdir()
        (bench_dir / "file.txt").write_text("test")

        assert check_bench_dir(bench_dir) is True

    def test_invalid_bench_dir_missing_build(self, tmpdir):
        """Test that check_bench_dir returns False when 'build' directory is missing."""
        bench_dir = Path(tmpdir)

        # Create only exe and run directories
        (bench_dir / "exe").mkdir()
        (bench_dir / "run").mkdir()

        assert check_bench_dir(bench_dir) is False

    def test_invalid_bench_dir_missing_exe(self, tmpdir):
        """Test that check_bench_dir returns False when 'exe' directory is missing."""
        bench_dir = Path(tmpdir)

        # Create only build and run directories
        (bench_dir / "build").mkdir()
        (bench_dir / "run").mkdir()

        assert check_bench_dir(bench_dir) is False

    def test_invalid_bench_dir_missing_run(self, tmpdir):
        """Test that check_bench_dir returns False when 'run' directory is missing."""
        bench_dir = Path(tmpdir)

        # Create only build and exe directories
        (bench_dir / "build").mkdir()
        (bench_dir / "exe").mkdir()

        assert check_bench_dir(bench_dir) is False

    def test_empty_dir(self, tmpdir):
        """Test that check_bench_dir returns False for an empty directory."""
        bench_dir = Path(tmpdir)
        assert check_bench_dir(bench_dir) is False

    def test_invalid_dir_case_sensitive(self, tmpdir):
        """Test that check_bench_dir is case-sensitive."""
        bench_dir = Path(tmpdir)

        # Create directories with different case
        (bench_dir / "Build").mkdir()
        (bench_dir / "EXE").mkdir()
        (bench_dir / "RUN").mkdir()

        assert check_bench_dir(bench_dir) is False


@pytest.fixture
def mock_build_path():
    return Path("/mock/build/path")


@pytest.fixture
def mock_spec_env():
    return {"CC": "gcc", "CFLAGS": "-O2"}


@pytest.fixture
def mock_mc_path(mock_build_path):
    return Path("/mock/build/path/x264_src/common/mc.c")


def test_recompile_mc_src(mock_build_path, mock_spec_env, mock_mc_path):
    test_mc_src = "test source code"

    with (
        patch("speccpu.x264.get_mc_path", return_value=mock_mc_path) as mock_get_path,
        patch("builtins.open", mock_open()) as mock_file,
        patch("speccpu.x264.recompile_mc") as mock_recompile,
        patch.object(Path, "exists", return_value=True),
        patch.object(Path, "is_file", return_value=True),
    ):

        # Configure recompile_mc mock to return a path
        mock_exe_path = Path("/mock/build/path/x264_s")
        mock_recompile.return_value = mock_exe_path

        # Call the function under test
        result = recompile_mc_src(test_mc_src, mock_build_path, mock_spec_env)

        # Verify the function behavior
        mock_get_path.assert_called_once_with(mock_build_path)
        mock_file.assert_called_once_with(mock_mc_path, "w")
        mock_file().write.assert_called_once_with(test_mc_src)
        mock_recompile.assert_called_once_with(
            mock_mc_path, mock_build_path, mock_spec_env
        )


def test_recompile_mc_src_file_not_exists(mock_build_path, mock_spec_env, mock_mc_path):
    test_mc_src = "test source code"

    with (
        patch("speccpu.x264.get_mc_path", return_value=mock_mc_path),
        patch.object(Path, "exists", return_value=False),
    ):

        # Test that the function raises an assertion error when file doesn't exist
        with pytest.raises(AssertionError):
            recompile_mc_src(test_mc_src, mock_build_path, mock_spec_env)


def test_recompile_mc_src_exe_not_exists(mock_build_path, mock_spec_env, mock_mc_path):
    test_mc_src = "test source code"

    with (
        patch("speccpu.x264.get_mc_path", return_value=mock_mc_path) as mock_get_path,
        patch("builtins.open", mock_open()) as mock_file,
        patch("speccpu.x264.recompile_mc") as mock_recompile,
        patch.object(Path, "exists", side_effect=[True, False]),
        patch.object(Path, "is_file", return_value=True),
    ):

        # Configure recompile_mc mock to return a path
        mock_exe_path = Path("/mock/build/path/x264_s")
        mock_recompile.return_value = mock_exe_path

        # Test that the function raises an assertion error when exe doesn't exist
        with pytest.raises(AssertionError):
            recompile_mc_src(test_mc_src, mock_build_path, mock_spec_env)


def test_recompile_mc_src_exe_not_file(mock_build_path, mock_spec_env, mock_mc_path):
    test_mc_src = "test source code"

    with (
        patch("speccpu.x264.get_mc_path", return_value=mock_mc_path) as mock_get_path,
        patch("builtins.open", mock_open()) as mock_file,
        patch("speccpu.x264.recompile_mc") as mock_recompile,
        patch.object(Path, "exists", return_value=True),
        patch.object(Path, "is_file", return_value=False),
    ):

        # Configure recompile_mc mock to return a path
        mock_exe_path = Path("/mock/build/path/x264_s")
        mock_recompile.return_value = mock_exe_path

        # Test that the function raises an assertion error when exe is not a file
        with pytest.raises(AssertionError):
            recompile_mc_src(test_mc_src, mock_build_path, mock_spec_env)