from backend.app.utils.sidecar import SidecarData, find_sidecar, parse_sidecar


def test_find_sidecar_stem_json(tmp_path):
    media = tmp_path / "photo.jpg"
    media.write_bytes(b"x")
    sc = tmp_path / "photo.json"
    sc.write_text("{}")
    assert find_sidecar(media) == sc


def test_find_sidecar_full_name_json(tmp_path):
    media = tmp_path / "photo.jpg"
    media.write_bytes(b"x")
    sc = tmp_path / "photo.jpg.json"
    sc.write_text("{}")
    assert find_sidecar(media) == sc


def test_find_sidecar_none(tmp_path):
    media = tmp_path / "photo.jpg"
    media.write_bytes(b"x")
    assert find_sidecar(media) is None


def test_parse_empty_dict_all_none():
    sd = parse_sidecar({})
    assert isinstance(sd, SidecarData)
    assert (sd.platform, sd.external_post_id, sd.post_url, sd.post_title,
            sd.description, sd.attachment_count, sd.post_date) == (
        None, None, None, None, None, None, None)
    assert sd.raw == {}


def test_parse_core_fields_and_id_priority():
    sd = parse_sidecar({
        "category": "patreon",
        "id": 12345, "post_id": 999,
        "url": "https://patreon.com/posts/12345",
        "title": "  Hello  ",
        "content": "<p>body</p>",
        "page_count": 4,
        "published_at": "2023-08-01T04:20:02Z",
    })
    assert sd.platform == "patreon"
    assert sd.external_post_id == "12345"          # 'id' wins over 'post_id'
    assert sd.post_url == "https://patreon.com/posts/12345"
    assert sd.post_title == "Hello"
    assert sd.description == "<p>body</p>"
    assert sd.attachment_count == 4
    assert sd.post_date.year == 2023 and sd.post_date.tzinfo is not None


def test_parse_description_precedence_and_images_count():
    sd = parse_sidecar({"description": "d", "caption": "c",
                         "images": [1, 2, 3]})
    assert sd.description == "d"          # content>description>caption
    assert sd.attachment_count == 3      # len(images) fallback


def test_parse_date_epoch_and_unparseable_and_naive():
    assert parse_sidecar({"timestamp": 1690857602}).post_date.tzinfo is not None
    assert parse_sidecar({"date": "not-a-date"}).post_date is None
    naive = parse_sidecar({"date": "2023-08-01T00:00:00"}).post_date
    assert naive is not None and naive.utcoffset().total_seconds() == 0


def test_parse_ignores_non_str_junk():
    sd = parse_sidecar({"category": 5, "title": 7, "page_count": "x",
                        "id": True})
    assert sd.platform is None and sd.post_title is None
    assert sd.attachment_count is None
    assert sd.external_post_id is None   # bool is not a valid id
    assert sd.raw == {"category": 5, "title": 7, "page_count": "x",
                      "id": True}