"""Tests for helper functions in the GUI module (gui.py)."""

import json

import pytest


# ── _fmt_ms ───────────────────────────────────────────────────────────────────

class TestFmtMs:
    """Tests for the _fmt_ms helper."""

    def _import(self):
        from gui import _fmt_ms
        return _fmt_ms

    def test_zero(self):
        fn = self._import()
        assert fn(0) == "0:00"

    def test_seconds_only(self):
        fn = self._import()
        assert fn(5_000) == "0:05"
        assert fn(59_000) == "0:59"

    def test_minutes(self):
        fn = self._import()
        assert fn(60_000) == "1:00"
        assert fn(90_000) == "1:30"
        assert fn(3599_000) == "59:59"

    def test_hours_display(self):
        fn = self._import()
        assert fn(3600_000) == "60:00"
        assert fn(3661_000) == "61:01"

    def test_large_duration(self):
        fn = self._import()
        assert fn(5999_000) == "99:59"


# ── _artists_str ─────────────────────────────────────────────────────────────

class TestArtistsStr:
    """Tests for the _artists_str helper."""

    def _import(self):
        from gui import _artists_str
        return _artists_str

    def test_none(self):
        fn = self._import()
        assert fn(None) == ""

    def test_empty_list(self):
        fn = self._import()
        assert fn([]) == ""

    def test_not_a_list(self):
        fn = self._import()
        assert fn("str") == ""
        assert fn(42) == ""

    def test_single_artist(self):
        fn = self._import()
        assert fn([{"name": "Artist One", "id": "a1"}]) == "Artist One"

    def test_multiple_artists(self):
        fn = self._import()
        artists = [
            {"name": "Artist One", "id": "a1"},
            {"name": "Artist Two", "id": "a2"},
        ]
        assert fn(artists) == "Artist One, Artist Two"

    def test_artist_without_name_key(self):
        fn = self._import()
        assert fn([{"id": "a1"}]) == ""

    def test_mixed_valid_and_invalid(self):
        fn = self._import()
        artists = [
            {"name": "Valid", "id": "v1"},
            {"id": "no_name"},
            {"name": "Also Valid", "id": "v2"},
        ]
        assert fn(artists) == "Valid, Also Valid"


# ── _norm_artists ────────────────────────────────────────────────────────────

class TestNormArtists:
    """Tests for the _norm_artists helper."""

    def _import(self):
        from gui import _norm_artists
        return _norm_artists

    def test_none(self):
        fn = self._import()
        assert fn(None) == []

    def test_not_a_list(self):
        fn = self._import()
        assert fn("not a list") == []
        assert fn(42) == []

    def test_empty_list(self):
        fn = self._import()
        assert fn([]) == []

    def test_filters_non_dicts(self):
        fn = self._import()
        artists = [{"name": "Real"}, "just a string", 123, {"name": "Another"}]
        result = fn(artists)
        assert len(result) == 2
        assert result[0]["name"] == "Real"
        assert result[1]["name"] == "Another"

    def test_all_valid(self):
        fn = self._import()
        artists = [{"name": "A"}, {"name": "B"}]
        assert fn(artists) == artists


# ── _artists_from_json ───────────────────────────────────────────────────────

class TestArtistsFromJson:
    """Tests for the _artists_from_json helper."""

    def _import(self):
        from gui import _artists_from_json
        return _artists_from_json

    def test_valid_json_array(self):
        fn = self._import()
        j = json.dumps([{"name": "Artist A", "id": "a1"}, {"name": "Artist B", "id": "a2"}])
        assert fn(j) == "Artist A, Artist B"

    def test_single_artist_json(self):
        fn = self._import()
        j = json.dumps([{"name": "Solo Artist", "id": "s1"}])
        assert fn(j) == "Solo Artist"

    def test_invalid_json(self):
        fn = self._import()
        assert fn("not json") == "not json"

    def test_empty_array(self):
        fn = self._import()
        assert fn("[]") == ""

    def test_plain_string_input(self):
        fn = self._import()
        assert fn("Just a name") == "Just a name"

    def test_jagged_array_skips_non_dicts(self):
        fn = self._import()
        j = json.dumps([{"name": "Real"}, 42, "str", {"name": "Also Real"}])
        assert fn(j) == "Real, Also Real"


# ── _css ───────────────────────────────────────────────────────────────────

class TestCss:
    """Tests for the _css helper."""

    def _import(self):
        from gui import _css
        return _css

    def test_joins_multiple_parts(self):
        fn = self._import()
        assert fn("color: red;", "background: blue;") == "color: red;background: blue;"

    def test_single_part(self):
        fn = self._import()
        assert fn("color: red;") == "color: red;"

    def test_empty_parts(self):
        fn = self._import()
        assert fn() == ""


# ── _get_thumbnail_nam ────────────────────────────────────────────────────

class TestGetThumbnailNam:
    """Tests for the _get_thumbnail_nam helper."""

    def _import(self):
        from gui import _get_thumbnail_nam
        return _get_thumbnail_nam

    def test_returns_network_access_manager(self):
        fn = self._import()
        nam = fn()
        # Should return some kind of object (QNetworkAccessManager or MagicMock)
        assert nam is not None

    def test_is_singleton(self):
        fn = self._import()
        nam1 = fn()
        nam2 = fn()
        assert nam1 is nam2


# ── _cached_thumb_path ────────────────────────────────────────────────────

class TestCachedThumbPath:
    """Tests for the _cached_thumb_path helper."""

    def _import(self):
        from gui import _cached_thumb_path, THUMB_CACHE_DIR
        return _cached_thumb_path, THUMB_CACHE_DIR

    def test_uses_cache_dir(self):
        fn, cache_dir = self._import()
        path = fn("video123")
        assert str(path) == str(cache_dir / "video123.jpg")

    def test_ends_with_jpg(self):
        fn, _ = self._import()
        path = fn("abc_def")
        assert path.suffix == ".jpg"
        assert "abc_def" in path.name