import os
import sys
import unittest
from unittest.mock import patch, mock_open
from ansible.errors import AnsibleFilterError

# ensure filter_plugins is on the path
dir_path = os.path.abspath(
    os.path.join(os.path.dirname(__file__), '../../filter_plugins')
)
sys.path.insert(0, dir_path)

from applications_if_group_and_deps import FilterModule

class TestApplicationsIfGroupAndDeps(unittest.TestCase):
    def setUp(self):
        self.filter = FilterModule()
        # minimal applications dict
        self.apps = {
            'app1': {'foo': 'bar'},
            'app2': {'baz': 'qux'},
            'roleA': {'some': 'cfg'},
        }

    def test_invalid_inputs(self):
        with self.assertRaises(AnsibleFilterError):
            self.filter.applications_if_group_and_deps('not a dict', [])
        with self.assertRaises(AnsibleFilterError):
            self.filter.applications_if_group_and_deps({}, 'not a list')

    def test_direct_inclusion(self):
        # if an app key is directly in group_names it should be returned
        groups = ['app1', 'unrelated']
        result = self.filter.applications_if_group_and_deps(self.apps, groups)
        self.assertEqual(set(result.keys()), {'app1'})

    @patch('applications_if_group_and_deps.yaml.safe_load')
    @patch('applications_if_group_and_deps.open', new_callable=mock_open)
    @patch('applications_if_group_and_deps.os.path.isfile')
    def test_indirect_inclusion_via_dependencies(self, mock_isfile, mock_file, mock_yaml):
        """
        Simulate that group 'groupX' has a dependency on 'roleA', and that
        roleA's vars/main.yml contains application_id: 'roleA'.
        Then passing group_names=['groupX'] should include 'roleA'.
        """
        # pretend both meta/main.yml and vars/main.yml exist
        mock_isfile.return_value = True

        # safe_load() calls:
        # 1) groupX/meta/main.yml → dependencies ['roleA']
        # 2) roleA/meta/main.yml  → dependencies []
        # 3) roleA/vars/main.yml  → application_id 'roleA'
        mock_yaml.side_effect = [
            {'dependencies': ['roleA']},
            {'dependencies': []},
            {'application_id': 'roleA'}
        ]

        result = self.filter.applications_if_group_and_deps(self.apps, ['groupX'])
        self.assertEqual(set(result.keys()), {'roleA'})

    @patch('applications_if_group_and_deps.yaml.safe_load')
    @patch('applications_if_group_and_deps.open', new_callable=mock_open)
    @patch('applications_if_group_and_deps.os.path.isfile')
    def test_no_vars_file(self, mock_isfile, mock_file, mock_yaml):
        """
        If a meta/main.yml dependency exists but vars/main.yml is missing,
        that role won't contribute an application_id, so nothing is returned.
        """
        # meta exists, vars does not
        def isfile_side(path):
            return path.endswith('meta/main.yml')
        mock_isfile.side_effect = isfile_side

        # meta declares dependency
        mock_yaml.return_value = {'dependencies': ['roleA']}

        result = self.filter.applications_if_group_and_deps(self.apps, ['groupX'])
        self.assertEqual(result, {})


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