from django.test import TestCase

from misago.categories.models import Category
from misago.threads.threadtypes.treesmap import TreesMap


THREAD_TYPE = 'misago.threads.threadtypes.thread.Thread'


class TreesMapTests(TestCase):
    def test_load_types(self):
        """TreesMap().load_types() loads types modules"""
        trees_map = TreesMap(None)
        types = trees_map.load_types([THREAD_TYPE])

        self.assertEqual(len(types), 1, "expected to load only one thread type")
        self.assertIn('root_category', types, "invalid thread type was loaded")

    def test_load_trees(self):
        """TreesMap().load_trees() loads trees ids"""
        trees_map = TreesMap(None)
        types = trees_map.load_types([THREAD_TYPE])
        trees = trees_map.load_trees(types)

        tree_id = Category.objects.get(special_role='root_category').tree_id

        self.assertEqual(len(trees), 1, "expected to load only one tree")
        self.assertEqual(trees[tree_id].root_name, 'root_category', "invalid tree was loaded")

    def test_get_roots(self):
        """TreesMap().get_roots() returns roots to trees dict"""
        trees_map = TreesMap(None)
        types = trees_map.load_types([THREAD_TYPE])
        trees = trees_map.load_trees(types)
        roots = trees_map.get_roots(trees)

        tree_id = Category.objects.get(special_role='root_category').tree_id

        self.assertEqual(len(roots), 1, "expected to load only one root")
        self.assertIn('root_category', roots, "invalid root was loaded")
        self.assertEqual(roots['root_category'], tree_id, "invalid tree_id was loaded")

    def test_load(self):
        """TreesMap().load() populates trees map"""
        trees_map = TreesMap([THREAD_TYPE])

        self.assertFalse(trees_map.is_loaded, "trees map should be not loaded by default")

        trees_map.load()

        self.assertTrue(trees_map.is_loaded, "trees map should be loaded after call to load()")

        self.assertEqual(len(trees_map.types), 1, "expected to load one type")
        self.assertEqual(len(trees_map.trees), 1, "expected to load one tree")
        self.assertEqual(len(trees_map.roots), 1, "expected to load one root")

        tree_id = Category.objects.get(special_role='root_category').tree_id

        self.assertIn('root_category', trees_map.types, "invalid thread type was loaded")
        self.assertEqual(
            trees_map.trees[tree_id].root_name, 'root_category', "invalid tree was loaded"
        )
        self.assertIn('root_category', trees_map.roots, "invalid root was loaded")

    def test_get_type_for_tree_id(self):
        """TreesMap().get_type_for_tree_id() returns type for valid id"""
        trees_map = TreesMap([THREAD_TYPE])
        trees_map.load()

        tree_id = Category.objects.get(special_role='root_category').tree_id
        thread_type = trees_map.get_type_for_tree_id(tree_id)

        self.assertEqual(
            thread_type.root_name, 'root_category',
            "returned invalid thread type for given tree id"
        )

        try:
            trees_map.get_type_for_tree_id(tree_id + 1000)
            self.fail("invalid tree id should cause KeyError being raised")
        except KeyError as e:
            self.assertIn(
                "tree id has no type defined",
                str(e), "invalid exception message as given"
            )

    def test_get_tree_id_for_root(self):
        """TreesMap().get_tree_id_for_root() returns tree id for valid type name"""
        trees_map = TreesMap([THREAD_TYPE])
        trees_map.load()

        in_db_tree_id = Category.objects.get(special_role='root_category').tree_id
        tree_id = trees_map.get_tree_id_for_root('root_category')

        self.assertEqual(tree_id, in_db_tree_id, "root name didn't match one in database")

        try:
            trees_map.get_tree_id_for_root('hurr_durr')
            self.fail("invalid root name should cause KeyError being raised")
        except KeyError as e:
            self.assertIn(
                '"hurr_durr" root has no tree defined',
                str(e), "invalid exception message as given"
            )