import textwrap
from pathlib import Path

from check_markdown_links import find_broken_links


def write(path: Path, content: str) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(textwrap.dedent(content).lstrip(), encoding="utf-8")


def test_reports_missing_local_markdown_target_with_line_number(tmp_path: Path):
    write(
        tmp_path / "README.md",
        """
        # Repo

        See [status](docs/status.md).
        """,
    )

    broken = find_broken_links(tmp_path)

    assert len(broken) == 1
    assert broken[0]["source"].endswith("README.md")
    assert broken[0]["line"] == 3
    assert broken[0]["target"] == "docs/status.md"


def test_allows_existing_relative_targets(tmp_path: Path):
    write(tmp_path / "docs" / "status.md", "# Status\n")
    write(
        tmp_path / "README.md",
        """
        # Repo

        See [status](docs/status.md).
        """,
    )

    assert find_broken_links(tmp_path) == []


def test_ignores_external_anchor_mailto_and_tel_links(tmp_path: Path):
    write(
        tmp_path / "README.md",
        """
        [external](https://example.com)
        [anchor](#section)
        [mail](mailto:test@example.com)
        [call](tel:988)
        """,
    )

    assert find_broken_links(tmp_path) == []


def test_ignores_links_inside_fenced_code_blocks(tmp_path: Path):
    write(
        tmp_path / "README.md",
        """
        ```md
        [broken](docs/missing.md)
        ```
        """,
    )

    assert find_broken_links(tmp_path) == []


def test_skips_build_directories(tmp_path: Path):
    write(tmp_path / "build" / "README.md", "[broken](missing.md)\n")

    assert find_broken_links(tmp_path) == []