"""
Tests that deal with setuptools namespace
packages, and in particular the installation
flavour used by pip
"""
import os
import sys
import subprocess
import unittest
import textwrap
import shutil

import pytest

from PyInstaller.lib.modulegraph import modulegraph

gRootDir = os.path.dirname(os.path.abspath(__file__))
gSrcDir = os.path.join(gRootDir, 'testpkg-setuptools-namespace')


@pytest.fixture
def install_testpkg(tmpdir):
    # Copy the package to ``dest_dir``, so that the build won't modify anything in ``gSrcDir``.
    dest_dir = str(tmpdir / 'data')
    shutil.copytree(gSrcDir, dest_dir)

    # A directory to place the resulting built library in.
    libdir = str(tmpdir / 'test')

    # Perform the build.
    subprocess.check_call([
        sys.executable, 'setup.py', 'install',
            '--install-lib', libdir,
            '--single-version-externally-managed',
            '--record', os.path.join(libdir, 'record.lst'),
        ], cwd=dest_dir)

    return libdir


class TestPythonBehaviour(object):

    def importModule(self, name, libdir):
        if '.' in name:
            script = textwrap.dedent("""\
                import site
                site.addsitedir(%r)
                try:
                    import %s
                except ImportError:
                    import %s
                print (%s.__name__)
            """) % (str(libdir), name, name.rsplit('.', 1)[0], name)
        else:
            script = textwrap.dedent("""\
                import site
                site.addsitedir(%r)
                import %s
                print (%s.__name__)
            """) % (str(libdir), name, name)

        data = subprocess.check_output(
            [sys.executable, '-c', script],
            stderr=subprocess.STDOUT,
            cwd=os.path.join(
                os.path.dirname(os.path.abspath(__file__)),
                'testpkg-relimport'),
            encoding='utf8',
        )
        data = data.strip()
        if data.endswith(' refs]'):
            data = data.rsplit('\n', 1)[0].strip()

        return data

    def testToplevel(self, install_testpkg):
        m = self.importModule('nspkg.module', install_testpkg)
        assert m == 'nspkg.module'

    def testSub(self, install_testpkg):
        m = self.importModule('nspkg.nssubpkg.sub', install_testpkg)
        assert m == 'nspkg.nssubpkg.sub'


@pytest.fixture
def install_testpkg_modulegraph(install_testpkg):
    return modulegraph.ModuleGraph(path=[str(install_testpkg)] + sys.path)


class TestModuleGraphImport(object):

    def testRootPkg(self, install_testpkg_modulegraph):
        install_testpkg_modulegraph.import_hook('nspkg')

        node = install_testpkg_modulegraph.find_node('nspkg')
        assert isinstance(node, modulegraph.NamespacePackage)
        assert node.identifier == 'nspkg'
        assert node.filename == '-'

    def testRootPkgModule(self, install_testpkg_modulegraph):
        install_testpkg_modulegraph.import_hook('nspkg.module')

        node = install_testpkg_modulegraph.find_node('nspkg.module')
        assert isinstance(node, modulegraph.SourceModule)
        assert node.identifier == 'nspkg.module'

    def testSubRootPkgModule(self, install_testpkg_modulegraph):
        install_testpkg_modulegraph.import_hook('nspkg.nssubpkg.sub')

        node = install_testpkg_modulegraph.find_node('nspkg.nssubpkg.sub')
        assert isinstance(node, modulegraph.SourceModule)
        assert node.identifier == 'nspkg.nssubpkg.sub'

        node = install_testpkg_modulegraph.find_node('nspkg')
        assert isinstance(node, modulegraph.NamespacePackage)


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