"""Unit tests for file system cache."""

import os
import shutil
import sys
import tempfile
import unittest
from typing import Optional

from mypy.fscache import FileSystemCache


class TestFileSystemCache(unittest.TestCase):
    def setUp(self) -> None:
        self.tempdir = tempfile.mkdtemp()
        self.oldcwd = os.getcwd()
        os.chdir(self.tempdir)
        self.fscache = FileSystemCache()

    def tearDown(self) -> None:
        os.chdir(self.oldcwd)
        shutil.rmtree(self.tempdir)

    def test_isfile_case_1(self) -> None:
        self.make_file('bar.py')
        self.make_file('pkg/sub_package/__init__.py')
        self.make_file('pkg/sub_package/foo.py')
        # Run twice to test both cached and non-cached code paths.
        for i in range(2):
            assert self.isfile_case('bar.py')
            assert self.isfile_case('pkg/sub_package/__init__.py')
            assert self.isfile_case('pkg/sub_package/foo.py')
            assert not self.isfile_case('non_existent.py')
            assert not self.isfile_case('pkg/non_existent.py')
            assert not self.isfile_case('pkg/')
            assert not self.isfile_case('bar.py/')
        for i in range(2):
            assert not self.isfile_case('Bar.py')
            assert not self.isfile_case('pkg/sub_package/__init__.PY')
            assert not self.isfile_case('pkg/Sub_Package/foo.py')
            assert not self.isfile_case('Pkg/sub_package/foo.py')

    def test_isfile_case_2(self) -> None:
        self.make_file('bar.py')
        self.make_file('pkg/sub_package/__init__.py')
        self.make_file('pkg/sub_package/foo.py')
        # Run twice to test both cached and non-cached code paths.
        # This reverses the order of checks from test_isfile_case_1.
        for i in range(2):
            assert not self.isfile_case('Bar.py')
            assert not self.isfile_case('pkg/sub_package/__init__.PY')
            assert not self.isfile_case('pkg/Sub_Package/foo.py')
            assert not self.isfile_case('Pkg/sub_package/foo.py')
        for i in range(2):
            assert self.isfile_case('bar.py')
            assert self.isfile_case('pkg/sub_package/__init__.py')
            assert self.isfile_case('pkg/sub_package/foo.py')
            assert not self.isfile_case('non_existent.py')
            assert not self.isfile_case('pkg/non_existent.py')

    def test_isfile_case_3(self) -> None:
        self.make_file('bar.py')
        self.make_file('pkg/sub_package/__init__.py')
        self.make_file('pkg/sub_package/foo.py')
        # Run twice to test both cached and non-cached code paths.
        for i in range(2):
            assert self.isfile_case('bar.py')
            assert not self.isfile_case('non_existent.py')
            assert not self.isfile_case('pkg/non_existent.py')
            assert not self.isfile_case('Bar.py')
            assert not self.isfile_case('pkg/sub_package/__init__.PY')
            assert not self.isfile_case('pkg/Sub_Package/foo.py')
            assert not self.isfile_case('Pkg/sub_package/foo.py')
            assert self.isfile_case('pkg/sub_package/__init__.py')
            assert self.isfile_case('pkg/sub_package/foo.py')

    def test_isfile_case_other_directory(self) -> None:
        self.make_file('bar.py')
        with tempfile.TemporaryDirectory() as other:
            self.make_file('other_dir.py', base=other)
            self.make_file('pkg/other_dir.py', base=other)
            assert self.isfile_case(os.path.join(other, 'other_dir.py'))
            assert not self.isfile_case(os.path.join(other, 'Other_Dir.py'))
            assert not self.isfile_case(os.path.join(other, 'bar.py'))
            if sys.platform in ('win32', 'darwin'):
                # We only check case for directories under our prefix, and since
                # this path is not under the prefix, case difference is fine.
                assert self.isfile_case(os.path.join(other, 'PKG/other_dir.py'))

    def make_file(self, path: str, base: Optional[str] = None) -> None:
        if base is None:
            base = self.tempdir
        fullpath = os.path.join(base, path)
        os.makedirs(os.path.dirname(fullpath), exist_ok=True)
        if not path.endswith('/'):
            with open(fullpath, 'w') as f:
                f.write('# test file')

    def isfile_case(self, path: str) -> bool:
        return self.fscache.isfile_case(os.path.join(self.tempdir, path), self.tempdir)