"""Unit tests for DOCX and PDF parsers.

LangChain experiment branch: parsers now return
``List[langchain_core.documents.Document]`` instead of ``List[ParsedBlock]``.
"""

from pathlib import Path

import pytest
from langchain_core.documents import Document

# ── DOCX parser tests ─────────────────────────────────────────────────────────

def _make_docx(tmp_path: Path) -> Path:
    """Create a minimal .docx fixture in ``tmp_path``."""
    from docx import Document as DocxDocument

    doc = DocxDocument()
    doc.add_heading("FIXTURE: Test Heading 1", level=1)
    doc.add_paragraph("FIXTURE: This is a normal paragraph for testing purposes.")
    doc.add_paragraph("FIXTURE: This is a second paragraph.", style="Normal")

    table = doc.add_table(rows=2, cols=2)
    table.cell(0, 0).text = "FIXTURE Cell A1"
    table.cell(0, 1).text = "FIXTURE Cell B1"
    table.cell(1, 0).text = "FIXTURE Cell A2"
    table.cell(1, 1).text = "FIXTURE Cell B2"

    out = tmp_path / "fixture.docx"
    doc.save(str(out))
    return out


def test_parse_docx_returns_documents(tmp_path: Path) -> None:
    """parse_docx should return a non-empty list of LangChain Documents."""
    from app.ingest.parser_docx import parse_docx

    docx_path = _make_docx(tmp_path)
    docs = parse_docx(docx_path)
    assert isinstance(docs, list)
    assert len(docs) > 0
    assert all(isinstance(d, Document) for d in docs)


def test_parse_docx_has_text_content(tmp_path: Path) -> None:
    """Parsed DOCX documents must have non-empty page_content."""
    from app.ingest.parser_docx import parse_docx

    docx_path = _make_docx(tmp_path)
    docs = parse_docx(docx_path)
    combined = " ".join(d.page_content for d in docs)
    assert "FIXTURE" in combined, "Expected fixture text not found in parsed content"


def test_parse_docx_has_source_metadata(tmp_path: Path) -> None:
    """Parsed DOCX documents must carry a 'source' metadata key."""
    from app.ingest.parser_docx import parse_docx

    docx_path = _make_docx(tmp_path)
    docs = parse_docx(docx_path)
    for doc in docs:
        assert "source" in doc.metadata, "Missing 'source' metadata"


def test_parse_docx_missing_file() -> None:
    """parse_docx should raise FileNotFoundError for non-existent file."""
    from app.ingest.parser_docx import parse_docx

    with pytest.raises(FileNotFoundError):
        parse_docx(Path("/nonexistent/file.docx"))


# ── PDF parser tests ──────────────────────────────────────────────────────────

def _make_pdf(tmp_path: Path) -> Path:
    """Create a minimal one-page PDF fixture."""
    import fitz  # type: ignore[import-untyped]

    doc = fitz.open()
    page = doc.new_page()
    page.insert_text((72, 72), "FIXTURE: PDF Heading Line", fontsize=18)
    page.insert_text((72, 110), "FIXTURE: This is a normal paragraph in the PDF.", fontsize=11)
    page.insert_text((72, 130), "FIXTURE: Second line of normal body text.", fontsize=11)
    out = tmp_path / "fixture.pdf"
    doc.save(str(out))
    doc.close()
    return out


def test_parse_pdf_returns_documents(tmp_path: Path) -> None:
    """parse_pdf should return a non-empty list of LangChain Documents."""
    from app.ingest.parser_pdf import parse_pdf

    pdf_path = _make_pdf(tmp_path)
    docs = parse_pdf(pdf_path)
    assert isinstance(docs, list)
    assert len(docs) > 0
    assert all(isinstance(d, Document) for d in docs)


def test_parse_pdf_has_text_content(tmp_path: Path) -> None:
    """Parsed PDF documents must contain the fixture text."""
    from app.ingest.parser_pdf import parse_pdf

    pdf_path = _make_pdf(tmp_path)
    docs = parse_pdf(pdf_path)
    combined = " ".join(d.page_content for d in docs)
    assert "FIXTURE" in combined, "Expected fixture text not found in parsed content"


def test_parse_pdf_page_metadata(tmp_path: Path) -> None:
    """PyMuPDFLoader attaches page metadata to each document."""
    from app.ingest.parser_pdf import parse_pdf

    pdf_path = _make_pdf(tmp_path)
    docs = parse_pdf(pdf_path)
    for doc in docs:
        assert "page" in doc.metadata, "Missing 'page' metadata from PyMuPDFLoader"


def test_parse_pdf_missing_file() -> None:
    """parse_pdf should raise FileNotFoundError for non-existent file."""
    from app.ingest.parser_pdf import parse_pdf

    with pytest.raises(FileNotFoundError):
        parse_pdf(Path("/nonexistent/file.pdf"))