"""Tests for codex.parsing.grobid."""

from __future__ import annotations

from pathlib import Path
from unittest.mock import MagicMock, patch

from codex.parsing.grobid import extract_references, extract_structure

# Real GROBID TEI output uses type="arXiv" (camel-case), not "arxiv".
_TEI_XML = """\
<?xml version="1.0" encoding="UTF-8"?>
<TEI xmlns="http://www.tei-c.org/ns/1.0">
  <text>
    <back>
      <div type="references">
        <listBibl>
          <biblStruct>
            <analytic>
              <title level="a">Deep Learning for NLP</title>
              <author>
                <persName>
                  <forename>Jane</forename>
                  <surname>Doe</surname>
                </persName>
              </author>
            </analytic>
            <monogr>
              <imprint>
                <date type="published" when="2021-06"/>
              </imprint>
            </monogr>
            <idno type="DOI">10.1234/nlp.2021</idno>
            <idno type="arXiv">2101.00001</idno>
          </biblStruct>
          <biblStruct>
            <analytic>
              <title level="a">Attention Is All You Need</title>
              <author>
                <persName>
                  <forename>Ashish</forename>
                  <surname>Vaswani</surname>
                </persName>
              </author>
              <author>
                <persName>
                  <forename>Noam</forename>
                  <surname>Shazeer</surname>
                </persName>
              </author>
            </analytic>
            <monogr>
              <imprint>
                <date type="published" when="2017"/>
              </imprint>
            </monogr>
            <idno type="DOI">10.5678/attention</idno>
          </biblStruct>
        </listBibl>
      </div>
    </back>
  </text>
</TEI>
"""


class _FakeResponse:
    text = _TEI_XML
    status_code = 200

    def raise_for_status(self) -> None:
        pass


def _mock_post(xml: str = _TEI_XML) -> MagicMock:
    fake = MagicMock()
    fake.text = xml
    fake.status_code = 200
    fake.raise_for_status = MagicMock()
    return fake


class TestExtractReferences:
    def test_returns_two_dicts(self, tmp_path: Path) -> None:
        pdf = tmp_path / "paper.pdf"
        pdf.write_bytes(b"%PDF fake")

        with patch("httpx.Client") as mock_client_cls:
            mock_client = MagicMock()
            mock_client_cls.return_value.__enter__.return_value = mock_client
            mock_client.post.return_value = _mock_post()

            refs = extract_references(str(pdf), grobid_url="http://localhost:8070")

        assert len(refs) == 2

    def test_all_keys_present(self, tmp_path: Path) -> None:
        pdf = tmp_path / "paper.pdf"
        pdf.write_bytes(b"%PDF fake")

        with patch("httpx.Client") as mock_client_cls:
            mock_client = MagicMock()
            mock_client_cls.return_value.__enter__.return_value = mock_client
            mock_client.post.return_value = _mock_post()

            refs = extract_references(str(pdf), grobid_url="http://localhost:8070")

        required_keys = {"title", "authors", "year", "doi", "arxiv_id"}
        for ref in refs:
            assert required_keys == set(ref.keys()), f"Missing keys in {ref}"

    def test_first_ref_values(self, tmp_path: Path) -> None:
        pdf = tmp_path / "paper.pdf"
        pdf.write_bytes(b"%PDF fake")

        with patch("httpx.Client") as mock_client_cls:
            mock_client = MagicMock()
            mock_client_cls.return_value.__enter__.return_value = mock_client
            mock_client.post.return_value = _mock_post()

            refs = extract_references(str(pdf), grobid_url="http://localhost:8070")

        first = refs[0]
        assert first["title"] == "Deep Learning for NLP"
        assert "Jane Doe" in first["authors"]
        assert first["year"] == "2021"
        assert first["doi"] == "10.1234/nlp.2021"
        assert first["arxiv_id"] == "2101.00001"

    def test_second_ref_missing_arxiv_is_empty_string(self, tmp_path: Path) -> None:
        pdf = tmp_path / "paper.pdf"
        pdf.write_bytes(b"%PDF fake")

        with patch("httpx.Client") as mock_client_cls:
            mock_client = MagicMock()
            mock_client_cls.return_value.__enter__.return_value = mock_client
            mock_client.post.return_value = _mock_post()

            refs = extract_references(str(pdf), grobid_url="http://localhost:8070")

        second = refs[1]
        assert second["arxiv_id"] == ""
        assert second["title"] == "Attention Is All You Need"
        assert second["year"] == "2017"


class TestExtractStructure:
    def test_returns_xml_string(self, tmp_path: Path) -> None:
        pdf = tmp_path / "paper.pdf"
        pdf.write_bytes(b"%PDF fake")

        with patch("httpx.Client") as mock_client_cls:
            mock_client = MagicMock()
            mock_client_cls.return_value.__enter__.return_value = mock_client
            mock_client.post.return_value = _mock_post("<TEI>raw xml</TEI>")

            result = extract_structure(str(pdf), grobid_url="http://localhost:8070")

        assert result == "<TEI>raw xml</TEI>"
        mock_client.post.assert_called_once()
        assert "processFulltextDocument" in mock_client.post.call_args[0][0]