import importlib
import os
import shutil
import sys
import unittest
from pathlib import Path
import yt_dlp._globals

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
TEST_DATA_DIR = Path(os.path.dirname(os.path.abspath(__file__)), 'testdata')
sys.path.append(str(TEST_DATA_DIR))
importlib.invalidate_caches()

from yt_dlp.plugins import PACKAGE_NAME, PluginType, directories, load_plugins, load_all_plugin_types
from yt_dlp._globals import extractors, postprocessors, plugin_dirs, plugin_ies, plugin_pps, ALL_PLUGINS_LOADED


class TestPlugins(unittest.TestCase):

    TEST_PLUGIN_DIR = TEST_DATA_DIR / PACKAGE_NAME

    def setUp(self):
        plugin_ies.set({})
        plugin_pps.set({})
        plugin_dirs.set((...,))
        ALL_PLUGINS_LOADED.set(False)
        importlib.invalidate_caches()
        # Clearing override plugins is probably difficult
        for module_name in tuple(sys.modules):
            for plugin_type in ('extractor', 'postprocessor'):
                if module_name.startswith(f'{PACKAGE_NAME}.{plugin_type}.'):
                    del sys.modules[module_name]

    def test_directories_containing_plugins(self):
        self.assertIn(self.TEST_PLUGIN_DIR, map(Path, directories()))

    def test_extractor_classes(self):
        plugins_ie = load_plugins(PluginType.EXTRACTORS)

        self.assertIn(f'{PACKAGE_NAME}.extractor.normal', sys.modules.keys())
        self.assertIn('NormalPluginIE', plugins_ie.keys())

        # don't load modules with underscore prefix
        self.assertFalse(
            f'{PACKAGE_NAME}.extractor._ignore' in sys.modules,
            'loaded module beginning with underscore')
        self.assertNotIn('IgnorePluginIE', plugins_ie.keys())
        self.assertNotIn('IgnorePluginIE', plugin_ies.get())

        # Don't load extractors with underscore prefix
        self.assertNotIn('_IgnoreUnderscorePluginIE', plugins_ie.keys())
        self.assertNotIn('_IgnoreUnderscorePluginIE', plugin_ies.get())

        # Don't load extractors not specified in __all__ (if supplied)
        self.assertNotIn('IgnoreNotInAllPluginIE', plugins_ie.keys())
        self.assertNotIn('IgnoreNotInAllPluginIE', plugin_ies.get())
        self.assertIn('InAllPluginIE', plugins_ie.keys())
        self.assertIn('InAllPluginIE', plugin_ies.get())

        # Don't load override extractors
        self.assertNotIn('OverrideGenericIE', plugins_ie.keys())
        self.assertNotIn('OverrideGenericIE', plugin_ies.get())
        self.assertNotIn('_UnderscoreOverrideGenericIE', plugins_ie.keys())
        self.assertNotIn('_UnderscoreOverrideGenericIE', plugin_ies.get())

    def test_postprocessor_classes(self):
        plugins_pp = load_plugins(PluginType.POSTPROCESSORS)
        self.assertIn('NormalPluginPP', plugins_pp.keys())
        self.assertIn(f'{PACKAGE_NAME}.postprocessor.normal', sys.modules.keys())
        self.assertIn('NormalPluginPP', plugin_pps.get())

    def test_importing_zipped_module(self):
        zip_path = TEST_DATA_DIR / 'zipped_plugins.zip'
        shutil.make_archive(str(zip_path)[:-4], 'zip', str(zip_path)[:-4])
        sys.path.append(str(zip_path))  # add zip to search paths
        importlib.invalidate_caches()  # reset the import caches

        try:
            for plugin_type in ('extractor', 'postprocessor'):
                package = importlib.import_module(f'{PACKAGE_NAME}.{plugin_type}')
                self.assertIn(zip_path / PACKAGE_NAME / plugin_type, map(Path, package.__path__))

            plugins_ie = load_plugins(PluginType.EXTRACTORS)
            self.assertIn('ZippedPluginIE', plugins_ie.keys())

            plugins_pp = load_plugins(PluginType.POSTPROCESSORS)
            self.assertIn('ZippedPluginPP', plugins_pp.keys())

        finally:
            sys.path.remove(str(zip_path))
            os.remove(zip_path)
            importlib.invalidate_caches()  # reset the import caches

    def test_reloading_plugins(self):
        reload_plugins_path = TEST_DATA_DIR / 'reload_plugins'

        for plugin_type in ('extractor', 'postprocessor'):
            importlib.import_module(f'{PACKAGE_NAME}.{plugin_type}')
        load_plugins(PluginType.EXTRACTORS)
        load_plugins(PluginType.POSTPROCESSORS)

        # Remove default folder and add reload_plugin path
        sys.path.remove(str(TEST_DATA_DIR))
        sys.path.append(str(reload_plugins_path))
        importlib.invalidate_caches()
        try:
            for plugin_type in ('extractor', 'postprocessor'):
                package = importlib.import_module(f'{PACKAGE_NAME}.{plugin_type}')
                self.assertIn(reload_plugins_path / PACKAGE_NAME / plugin_type, map(Path, package.__path__))

            plugins_ie = load_plugins(PluginType.EXTRACTORS)
            self.assertIn('NormalPluginIE', plugins_ie.keys())
            self.assertTrue(
                plugins_ie['NormalPluginIE'].REPLACED,
                msg='Reloading has not replaced original extractor plugin')
            self.assertTrue(
                extractors.get()['NormalPluginIE'].REPLACED,
                msg='Reloading has not replaced original extractor plugin globally')

            plugins_pp = load_plugins(PluginType.POSTPROCESSORS)
            self.assertIn('NormalPluginPP', plugins_pp.keys())
            self.assertTrue(plugins_pp['NormalPluginPP'].REPLACED,
                            msg='Reloading has not replaced original postprocessor plugin')
            self.assertTrue(
                postprocessors.get()['NormalPluginPP'].REPLACED,
                msg='Reloading has not replaced original postprocessor plugin globally')

        finally:
            sys.path.remove(str(reload_plugins_path))
            sys.path.append(str(TEST_DATA_DIR))
            importlib.invalidate_caches()

    def test_extractor_override_plugin(self):
        load_plugins(PluginType.EXTRACTORS)

        from yt_dlp.extractor.generic import GenericIE

        self.assertEqual(GenericIE.TEST_FIELD, 'override')
        self.assertEqual(GenericIE.SECONDARY_TEST_FIELD, 'underscore-override')

        self.assertEqual(GenericIE.IE_NAME, 'generic+override+underscore-override')
        importlib.invalidate_caches()
        #  test that loading a second time doesn't wrap a second time
        load_plugins(PluginType.EXTRACTORS)
        from yt_dlp.extractor.generic import GenericIE
        self.assertEqual(GenericIE.IE_NAME, 'generic+override+underscore-override')

    def test_load_all_plugin_types(self):

        self.assertNotIn(f'{PACKAGE_NAME}.extractor.normal', sys.modules.keys())
        self.assertNotIn(f'{PACKAGE_NAME}.postprocessor.normal', sys.modules.keys())

        load_all_plugin_types()
        self.assertTrue(yt_dlp._globals.ALL_PLUGINS_LOADED.get())

        self.assertIn(f'{PACKAGE_NAME}.extractor.normal', sys.modules.keys())
        self.assertIn(f'{PACKAGE_NAME}.postprocessor.normal', sys.modules.keys())

    def test_plugin_dirs(self):
        plugin_dirs.set((..., str(TEST_DATA_DIR / 'plugin_packages')))
        load_all_plugin_types()
        self.assertTrue(yt_dlp._globals.ALL_PLUGINS_LOADED.get())

        self.assertIn(f'{PACKAGE_NAME}.extractor.package', sys.modules.keys())
        self.assertIn('PackagePluginIE', plugin_ies.get())


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