# tests/test_ingest.py
"""Unit tests for scripts/ingest_pdf.py."""
from __future__ import annotations

import sqlite3
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest

from scripts.ingest_pdf import run


@pytest.fixture
def ingest_db(tmp_path) -> tuple[str, str]:
    db_path = str(tmp_path / "test.db")
    schema = Path("migrations/001_initial_schema.sql").read_text()
    conn = sqlite3.connect(db_path)
    conn.executescript(schema)
    conn.execute(
        "INSERT INTO documents(id, title, file_path, status) VALUES ('d1','Test','test.pdf','pending')"
    )
    conn.commit()
    conn.close()
    vec_db_path = str(tmp_path / "vecs.db")
    return db_path, vec_db_path


def _make_mock_chunk(page_number: int = 1, text: str = "Some page text about rules.") -> MagicMock:
    chunk = MagicMock()
    chunk.page_number = page_number
    chunk.text = text
    chunk.source = "text_layer"
    chunk.word_count = len(text.split())
    return chunk


def test_ingest_sets_status_ready_on_success(ingest_db):
    db_path, vec_db_path = ingest_db

    mock_extractor = MagicMock()
    mock_extractor.chunk_pages.return_value = [_make_mock_chunk()]

    with patch("circuitforge_core.documents.pdf.PDFExtractor", return_value=mock_extractor):
        run(doc_id="d1", file_path="test.pdf", db_path=db_path, vec_db_path=vec_db_path)

    conn = sqlite3.connect(db_path)
    row = conn.execute("SELECT status, page_count FROM documents WHERE id='d1'").fetchone()
    conn.close()
    assert row[0] == "ready"
    assert row[1] == 1


def test_ingest_stores_page_chunks(ingest_db):
    db_path, vec_db_path = ingest_db

    mock_extractor = MagicMock()
    chunks = [_make_mock_chunk(page_number=i + 1, text=f"Page {i+1} text content.") for i in range(3)]
    mock_extractor.chunk_pages.return_value = chunks

    with patch("circuitforge_core.documents.pdf.PDFExtractor", return_value=mock_extractor):
        run(doc_id="d1", file_path="test.pdf", db_path=db_path, vec_db_path=vec_db_path)

    conn = sqlite3.connect(db_path)
    rows = conn.execute(
        "SELECT page_number, text FROM page_chunks WHERE doc_id='d1' ORDER BY page_number"
    ).fetchall()
    conn.close()
    assert len(rows) == 3
    assert rows[0][0] == 1
    assert "Page 1" in rows[0][1]


def test_ingest_sets_error_status_on_failure(ingest_db):
    db_path, vec_db_path = ingest_db

    with patch("circuitforge_core.documents.pdf.PDFExtractor", side_effect=RuntimeError("PDF corrupt")):
        from scripts.ingest_pdf import run
        with pytest.raises(RuntimeError):
            run(doc_id="d1", file_path="bad.pdf", db_path=db_path, vec_db_path=vec_db_path)

    conn = sqlite3.connect(db_path)
    row = conn.execute("SELECT status, error_msg FROM documents WHERE id='d1'").fetchone()
    conn.close()
    assert row[0] == "error"
    assert "PDF corrupt" in row[1]


def test_ingest_skips_embeddings_without_ollama_url(ingest_db, monkeypatch):
    """When PAGEPIPER_OLLAMA_URL is unset, no vec DB file should be created."""
    db_path, vec_db_path = ingest_db
    monkeypatch.delenv("PAGEPIPER_OLLAMA_URL", raising=False)

    mock_extractor = MagicMock()
    mock_extractor.chunk_pages.return_value = [_make_mock_chunk()]

    with patch("circuitforge_core.documents.pdf.PDFExtractor", return_value=mock_extractor):
        run(doc_id="d1", file_path="test.pdf", db_path=db_path, vec_db_path=vec_db_path)

    # No embeddings were requested, so the vec DB should not have been created
    assert not Path(vec_db_path).exists(), "vec DB should not be created without OLLAMA_URL"

    # Document should still be ready with chunks stored
    conn = sqlite3.connect(db_path)
    status = conn.execute("SELECT status FROM documents WHERE id='d1'").fetchone()[0]
    chunk_count = conn.execute(
        "SELECT COUNT(*) FROM page_chunks WHERE doc_id='d1'"
    ).fetchone()[0]
    conn.close()
    assert status == "ready"
    assert chunk_count == 1


def test_ingest_replaces_existing_chunks_on_reingest(ingest_db):
    """Re-running ingest for the same doc_id replaces old page_chunks."""
    db_path, vec_db_path = ingest_db

    mock_extractor = MagicMock()

    # First ingest: 3 pages
    mock_extractor.chunk_pages.return_value = [
        _make_mock_chunk(page_number=i + 1, text=f"Original page {i+1}.") for i in range(3)
    ]
    with patch("circuitforge_core.documents.pdf.PDFExtractor", return_value=mock_extractor):
        run(doc_id="d1", file_path="test.pdf", db_path=db_path, vec_db_path=vec_db_path)

    # Second ingest: 1 page (simulating a re-ingest after file change)
    mock_extractor.chunk_pages.return_value = [_make_mock_chunk(text="Updated single page.")]
    with patch("circuitforge_core.documents.pdf.PDFExtractor", return_value=mock_extractor):
        run(doc_id="d1", file_path="test.pdf", db_path=db_path, vec_db_path=vec_db_path)

    conn = sqlite3.connect(db_path)
    rows = conn.execute(
        "SELECT text FROM page_chunks WHERE doc_id='d1'"
    ).fetchall()
    conn.close()
    assert len(rows) == 1
    assert "Updated" in rows[0][0]