import pytest
import json
from pathlib import Path
from src.core.file import File
from src.core.tag import Tag
from src.core.tag_manager import TagManager


class TestFile:
    """Testy pro třídu File"""

    @pytest.fixture
    def temp_dir(self, tmp_path):
        """Fixture pro dočasný adresář"""
        return tmp_path

    @pytest.fixture
    def tag_manager(self):
        """Fixture pro TagManager"""
        return TagManager()

    @pytest.fixture
    def test_file(self, temp_dir):
        """Fixture pro testovací soubor"""
        test_file = temp_dir / "test.txt"
        test_file.write_text("test content")
        return test_file

    def test_file_creation(self, test_file, tag_manager):
        """Test vytvoření File objektu"""
        file_obj = File(test_file, tag_manager)
        assert file_obj.file_path == test_file
        assert file_obj.filename == "test.txt"
        assert file_obj.new == True

    def test_file_metadata_filename(self, test_file, tag_manager):
        """Test názvu metadata souboru"""
        file_obj = File(test_file, tag_manager)
        expected = test_file.parent / ".test.txt.!tag"
        assert file_obj.metadata_filename == expected

    def test_file_initial_tags(self, test_file, tag_manager):
        """Test že nový soubor nemá žádné automatické tagy (Stav/Nové odstraněn)"""
        file_obj = File(test_file, tag_manager)
        assert file_obj.tags == []

    def test_file_metadata_saved(self, test_file, tag_manager):
        """Test že metadata jsou uložena při vytvoření"""
        file_obj = File(test_file, tag_manager)
        assert file_obj.metadata_filename.exists()

    def test_file_save_metadata(self, test_file, tag_manager):
        """Test uložení metadat"""
        file_obj = File(test_file, tag_manager)
        file_obj.new = False
        file_obj.ignored = True
        file_obj.save_metadata()

        # Načtení a kontrola
        with open(file_obj.metadata_filename, "r", encoding="utf-8") as f:
            data = json.load(f)

        assert data["new"] == False
        assert data["ignored"] == True

    def test_file_load_metadata(self, test_file, tag_manager):
        """Test načtení metadat"""
        # Vytvoření a uložení metadat
        file_obj = File(test_file, tag_manager)
        tag = tag_manager.add_tag("Video", "HD")
        file_obj.tags.append(tag)
        file_obj.date = "2025-01-15"
        file_obj.save_metadata()

        # Vytvoření nového objektu - měl by načíst metadata
        file_obj2 = File(test_file, tag_manager)
        assert len(file_obj2.tags) == 1  # Video/HD
        assert file_obj2.date == "2025-01-15"

        # Kontrola že tagy obsahují správné hodnoty
        tag_paths = {tag.full_path for tag in file_obj2.tags}
        assert "Video/HD" in tag_paths

    def test_file_set_date(self, test_file, tag_manager):
        """Test nastavení data"""
        file_obj = File(test_file, tag_manager)
        file_obj.set_date("2025-12-25")
        assert file_obj.date == "2025-12-25"

        # Kontrola že bylo uloženo
        with open(file_obj.metadata_filename, "r", encoding="utf-8") as f:
            data = json.load(f)
        assert data["date"] == "2025-12-25"

    def test_file_set_date_to_none(self, test_file, tag_manager):
        """Test smazání data"""
        file_obj = File(test_file, tag_manager)
        file_obj.set_date("2025-12-25")
        file_obj.set_date(None)
        assert file_obj.date is None

    def test_file_set_date_empty_string(self, test_file, tag_manager):
        """Test nastavení prázdného řetězce jako datum"""
        file_obj = File(test_file, tag_manager)
        file_obj.set_date("2025-12-25")
        file_obj.set_date("")
        assert file_obj.date is None

    def test_file_add_tag_object(self, test_file, tag_manager):
        """Test přidání Tag objektu"""
        file_obj = File(test_file, tag_manager)
        tag = Tag("Video", "4K")
        file_obj.add_tag(tag)

        assert tag in file_obj.tags
        assert len(file_obj.tags) == 1  # Video/4K

    def test_file_add_tag_string(self, test_file, tag_manager):
        """Test přidání tagu jako string"""
        file_obj = File(test_file, tag_manager)
        file_obj.add_tag("Audio/MP3")

        tag_paths = {tag.full_path for tag in file_obj.tags}
        assert "Audio/MP3" in tag_paths

    def test_file_add_tag_string_without_category(self, test_file, tag_manager):
        """Test přidání tagu bez kategorie (použije 'default')"""
        file_obj = File(test_file, tag_manager)
        file_obj.add_tag("SimpleTag")

        tag_paths = {tag.full_path for tag in file_obj.tags}
        assert "default/SimpleTag" in tag_paths

    def test_file_add_duplicate_tag(self, test_file, tag_manager):
        """Test že duplicitní tag není přidán"""
        file_obj = File(test_file, tag_manager)
        tag = Tag("Video", "HD")
        file_obj.add_tag(tag)
        file_obj.add_tag(tag)

        # Spočítáme kolikrát se tag vyskytuje
        count = sum(1 for t in file_obj.tags if t == tag)
        assert count == 1

    def test_file_remove_tag_object(self, test_file, tag_manager):
        """Test odstranění Tag objektu"""
        file_obj = File(test_file, tag_manager)
        tag = Tag("Video", "HD")
        file_obj.add_tag(tag)
        file_obj.remove_tag(tag)

        assert tag not in file_obj.tags

    def test_file_remove_tag_string(self, test_file, tag_manager):
        """Test odstranění tagu jako string"""
        file_obj = File(test_file, tag_manager)
        file_obj.add_tag("Video/HD")
        file_obj.remove_tag("Video/HD")

        tag_paths = {tag.full_path for tag in file_obj.tags}
        assert "Video/HD" not in tag_paths

    def test_file_remove_tag_string_without_category(self, test_file, tag_manager):
        """Test odstranění tagu bez kategorie"""
        file_obj = File(test_file, tag_manager)
        file_obj.add_tag("SimpleTag")
        file_obj.remove_tag("SimpleTag")

        tag_paths = {tag.full_path for tag in file_obj.tags}
        assert "default/SimpleTag" not in tag_paths

    def test_file_remove_nonexistent_tag(self, test_file, tag_manager):
        """Test odstranění neexistujícího tagu (nemělo by vyhodit výjimku)"""
        file_obj = File(test_file, tag_manager)
        initial_count = len(file_obj.tags)
        file_obj.remove_tag("Nonexistent/Tag")
        assert len(file_obj.tags) == initial_count

    def test_file_without_tagmanager(self, test_file):
        """Test File bez TagManager"""
        file_obj = File(test_file, tagmanager=None)
        assert file_obj.tagmanager is None
        assert len(file_obj.tags) == 0  # nový soubor nemá žádné automatické tagy

    def test_file_metadata_persistence(self, test_file, tag_manager):
        """Test že metadata přežijí reload"""
        # Vytvoření a úprava souboru
        file_obj1 = File(test_file, tag_manager)
        file_obj1.add_tag("Video/HD")
        file_obj1.add_tag("Audio/Stereo")
        file_obj1.set_date("2025-01-01")
        file_obj1.new = False
        file_obj1.ignored = True
        file_obj1.save_metadata()

        # Načtení nového objektu
        file_obj2 = File(test_file, tag_manager)

        # Kontrola
        assert file_obj2.new == False
        assert file_obj2.ignored == True
        assert file_obj2.date == "2025-01-01"

        tag_paths = {tag.full_path for tag in file_obj2.tags}
        assert "Video/HD" in tag_paths
        assert "Audio/Stereo" in tag_paths

    def test_file_metadata_json_format(self, test_file, tag_manager):
        """Test formátu JSON metadat"""
        file_obj = File(test_file, tag_manager)
        file_obj.add_tag("Test/Tag")
        file_obj.set_date("2025-06-15")

        # Kontrola obsahu JSON
        with open(file_obj.metadata_filename, "r", encoding="utf-8") as f:
            data = json.load(f)

        assert "new" in data
        assert "ignored" in data
        assert "tags" in data
        assert "date" in data
        assert isinstance(data["tags"], list)

    def test_file_unicode_handling(self, temp_dir, tag_manager):
        """Test správného zacházení s unicode znaky"""
        test_file = temp_dir / "český_soubor.txt"
        test_file.write_text("obsah")

        file_obj = File(test_file, tag_manager)
        file_obj.add_tag("Kategorie/Český tag")
        file_obj.save_metadata()

        # Reload a kontrola
        file_obj2 = File(test_file, tag_manager)
        tag_paths = {tag.full_path for tag in file_obj2.tags}
        assert "Kategorie/Český tag" in tag_paths

    def test_file_complex_scenario(self, test_file, tag_manager):
        """Test komplexního scénáře použití"""
        file_obj = File(test_file, tag_manager)

        # Přidání více tagů
        file_obj.add_tag("Video/HD")
        file_obj.add_tag("Video/Stereo")
        file_obj.add_tag("Stav/Zkontrolováno")
        file_obj.set_date("2025-01-01")

        # Odstranění tagu
        file_obj.remove_tag("Stav/Nové")

        # Kontrola stavu
        tag_paths = {tag.full_path for tag in file_obj.tags}
        assert "Video/HD" in tag_paths
        assert "Video/Stereo" in tag_paths
        assert "Stav/Zkontrolováno" in tag_paths
        assert "Stav/Nové" not in tag_paths
        assert file_obj.date == "2025-01-01"

        # Reload a kontrola persistence
        file_obj2 = File(test_file, tag_manager)
        tag_paths2 = {tag.full_path for tag in file_obj2.tags}
        assert tag_paths == tag_paths2
        assert file_obj2.date == "2025-01-01"


class TestApplyCsfdTags:
    """Tests for File.apply_csfd_tags tag assignment (CSFD fetch is mocked)."""

    @pytest.fixture
    def tag_manager(self):
        return TagManager()

    @pytest.fixture
    def movie_file(self, tmp_path, tag_manager):
        path = tmp_path / "Matrix.mkv"
        path.write_text("x")
        f = File(path, tag_manager)
        f.set_csfd_link("https://www.csfd.cz/film/9499-matrix/")
        return f

    def test_apply_csfd_tags_assigns_expected_categories(self, movie_file):
        from unittest.mock import patch
        from src.core.csfd import CSFDMovie

        movie = CSFDMovie(
            title="Matrix", url="u", year=1999, genres=["Akční", "Sci-Fi"],
            directors=["Lana Wachowski", "Lilly Wachowski"],
            actors=["Keanu Reeves", "Laurence Fishburne"],
            rating=90, countries=["USA"],
        )
        with patch("src.core.csfd.fetch_movie", return_value=movie):
            result = movie_file.apply_csfd_tags()

        assert result["success"]
        paths = {t.full_path for t in movie_file.tags}
        assert "Žánr/Akční" in paths
        assert "Žánr/Sci-Fi" in paths
        assert "Rok/1999" in paths
        assert "Země původu/USA" in paths
        assert "Hodnocení/90" in paths  # exact value; folder grouping happens later

    def test_apply_csfd_tags_does_not_tag_directors_or_actors(self, movie_file):
        """Režie/herci se jen cachují, netvoří se z nich tagy (bylo by jich moc)."""
        from unittest.mock import patch
        from src.core.csfd import CSFDMovie

        movie = CSFDMovie(
            title="Matrix", url="u", directors=["Lana Wachowski"],
            actors=["Keanu Reeves", "Laurence Fishburne"], genres=["Drama"],
        )
        with patch("src.core.csfd.fetch_movie", return_value=movie):
            movie_file.apply_csfd_tags()

        paths = {t.full_path for t in movie_file.tags}
        assert not any(p.startswith("Režie/") for p in paths)
        assert not any(p.startswith("Herec/") for p in paths)
        # …but the data is kept in the cache
        cached = movie_file.get_cached_movie()
        assert cached.directors == ["Lana Wachowski"]
        assert cached.actors == ["Keanu Reeves", "Laurence Fishburne"]

    def test_name_context_fields(self, movie_file):
        movie_file.title = "Dr. No"
        movie_file.csfd_cache = {"year": 1962, "rating": 75}
        ctx = movie_file.name_context()
        assert ctx["title"] == "Dr. No"
        assert ctx["year"] == 1962
        assert ctx["rating"] == 75
        assert ctx["ext"] == movie_file.file_path.suffix
        assert ctx["filename"] == movie_file.filename
        assert "{year} - {title}{ext}".format(**ctx) == f"1962 - Dr. No{ctx['ext']}"

    def test_name_context_year_from_tag_when_no_cache(self, movie_file):
        movie_file.csfd_cache = None
        movie_file.add_tag("Rok/1999")
        assert movie_file.name_context()["year"] == "1999"

    def test_set_attribute_persists_and_in_context(self, movie_file):
        movie_file.set_attribute("collection_sort", "03")
        assert movie_file.attributes["collection_sort"] == "03"
        assert movie_file.name_context()["collection_sort"] == "03"
        # reload (from index) keeps it
        reloaded = File(movie_file.file_path, movie_file.tagmanager,
                        index=movie_file.index)
        assert reloaded.attributes["collection_sort"] == "03"

    def test_set_attribute_empty_removes_it(self, movie_file):
        movie_file.set_attribute("collection_sort", "03")
        movie_file.set_attribute("collection_sort", None)
        assert "collection_sort" not in movie_file.attributes

    def test_attribute_usable_in_filename_template(self, movie_file):
        movie_file.title = "Dr. No"
        movie_file.set_attribute("collection_sort", "01")
        ctx = movie_file.name_context()
        assert "{collection_sort} - {title}{ext}".format(**ctx) == \
            f"01 - Dr. No{ctx['ext']}"

    def test_apply_csfd_tags_honors_custom_schema(self, movie_file):
        """A schema without the rating entry produces no Hodnocení tags."""
        from unittest.mock import patch
        from src.core.csfd import CSFDMovie

        schema = [{"category": "Žánr", "csfd_field": "genres",
                   "transform": None, "filmoteka_root": ""}]
        movie = CSFDMovie(title="Matrix", url="u", rating=90, genres=["Drama"])
        with patch("src.core.csfd.fetch_movie", return_value=movie):
            movie_file.apply_csfd_tags(schema)

        paths = {t.full_path for t in movie_file.tags}
        assert "Žánr/Drama" in paths
        assert not any(p.startswith("Hodnocení/") for p in paths)

    def test_apply_csfd_tags_preserves_user_tags_on_refetch(self, movie_file):
        """Re-fetching regenerates only ČSFD tags; user-added tags survive."""
        from unittest.mock import patch
        from src.core.csfd import CSFDMovie

        movie_file.add_tag("Sbírka/Oblíbené")  # user tag
        first = CSFDMovie(title="A", url="u", year=1999, genres=["Akční"])
        with patch("src.core.csfd.fetch_movie", return_value=first):
            movie_file.apply_csfd_tags()
        # different movie on re-fetch
        second = CSFDMovie(title="B", url="u", year=2009, genres=["Drama"])
        with patch("src.core.csfd.fetch_movie", return_value=second):
            movie_file.apply_csfd_tags()

        paths = {t.full_path for t in movie_file.tags}
        assert "Sbírka/Oblíbené" in paths      # user tag kept
        assert "Žánr/Drama" in paths           # new ČSFD tag
        assert "Rok/2009" in paths
        assert "Žánr/Akční" not in paths       # stale ČSFD tag dropped
        assert "Rok/1999" not in paths