from prompt_toolkit.shortcuts.prompt import _split_multiline_prompt


def test_split_multiline_prompt():
    # Test 1: no newlines:
    tokens = [("class:testclass", "ab")]
    has_before_tokens, before, first_input_line = _split_multiline_prompt(
        lambda: tokens
    )
    assert has_before_tokens() is False
    assert before() == []
    assert first_input_line() == [
        ("class:testclass", "a"),
        ("class:testclass", "b"),
    ]

    # Test 1: multiple lines.
    tokens = [("class:testclass", "ab\ncd\nef")]
    has_before_tokens, before, first_input_line = _split_multiline_prompt(
        lambda: tokens
    )
    assert has_before_tokens() is True
    assert before() == [
        ("class:testclass", "a"),
        ("class:testclass", "b"),
        ("class:testclass", "\n"),
        ("class:testclass", "c"),
        ("class:testclass", "d"),
    ]
    assert first_input_line() == [
        ("class:testclass", "e"),
        ("class:testclass", "f"),
    ]

    # Edge case 1: starting with a newline.
    tokens = [("class:testclass", "\nab")]
    has_before_tokens, before, first_input_line = _split_multiline_prompt(
        lambda: tokens
    )
    assert has_before_tokens() is True
    assert before() == []
    assert first_input_line() == [("class:testclass", "a"), ("class:testclass", "b")]

    # Edge case 2: starting with two newlines.
    tokens = [("class:testclass", "\n\nab")]
    has_before_tokens, before, first_input_line = _split_multiline_prompt(
        lambda: tokens
    )
    assert has_before_tokens() is True
    assert before() == [("class:testclass", "\n")]
    assert first_input_line() == [("class:testclass", "a"), ("class:testclass", "b")]