from pocketbook.note import Note


class TestNoteSerialisation:
    def test_round_trip(self):
        note = Note(title="Shopping", body="Milk\nEggs\nBread")
        content = note.to_file_content()
        restored = Note.from_file_content(content)
        assert restored.title == note.title
        assert restored.body == note.body

    def test_empty_body(self):
        note = Note(title="Empty", body="")
        content = note.to_file_content()
        restored = Note.from_file_content(content)
        assert restored.title == "Empty"
        assert restored.body == ""

    def test_empty_title(self):
        note = Note(title="", body="some body")
        content = note.to_file_content()
        restored = Note.from_file_content(content)
        assert restored.title == ""
        assert restored.body == "some body"

    def test_unicode(self):
        note = Note(title="日本語タイトル", body="Ünïcödé bödý 🎉")
        content = note.to_file_content()
        restored = Note.from_file_content(content)
        assert restored.title == "日本語タイトル"
        assert restored.body == "Ünïcödé bödý 🎉"

    def test_multiline_body(self):
        body = "Line 1\nLine 2\n\nLine 4\n"
        note = Note(title="Multi", body=body)
        content = note.to_file_content()
        restored = Note.from_file_content(content)
        assert restored.body == body

    def test_file_content_format(self):
        """Title on line 1, blank line, then body."""
        note = Note(title="Title", body="Body text")
        content = note.to_file_content()
        assert content == "Title\n\nBody text"

    def test_from_file_content_no_blank_line(self):
        """Gracefully handle files without a blank separator."""
        restored = Note.from_file_content("JustTitle")
        assert restored.title == "JustTitle"
        assert restored.body == ""


class TestNoteFilename:
    def test_generate_filename(self):
        note = Note(title="Test", body="")
        filename = note.generate_filename(order=1)
        assert filename.startswith("0001-")
        assert filename.endswith(".txt")
        # Format: 0001-YYYYMMDD-HHMMSS-shortid.txt
        parts = filename.split("-")
        assert len(parts) == 4
        assert len(parts[0]) == 4  # order
        assert len(parts[1]) == 8  # date
        # parts[2] = HHMMSS + shortid.txt combined via split on -
        # Actually: 0001-20260225-143012-abc12.txt has 4 parts

    def test_parse_order_from_filename(self):
        assert Note.parse_order("0005-20260101-120000-abc12.txt") == 5
        assert Note.parse_order("0001-20260101-120000-xyz99.txt") == 1