"""Tests for explicit chunk project_id metadata backfill."""

import json

import atocore.config as config
from atocore.models.database import get_connection, init_db
from scripts import backfill_chunk_project_ids as backfill


def _write_registry(tmp_path, monkeypatch):
    vault_dir = tmp_path / "vault"
    drive_dir = tmp_path / "drive"
    config_dir = tmp_path / "config"
    project_dir = vault_dir / "incoming" / "projects" / "p04-gigabit"
    project_dir.mkdir(parents=True)
    drive_dir.mkdir()
    config_dir.mkdir()
    registry_path = config_dir / "project-registry.json"
    registry_path.write_text(
        json.dumps(
            {
                "projects": [
                    {
                        "id": "p04-gigabit",
                        "aliases": ["p04"],
                        "ingest_roots": [
                            {"source": "vault", "subpath": "incoming/projects/p04-gigabit"}
                        ],
                    }
                ]
            }
        ),
        encoding="utf-8",
    )
    monkeypatch.setenv("ATOCORE_VAULT_SOURCE_DIR", str(vault_dir))
    monkeypatch.setenv("ATOCORE_DRIVE_SOURCE_DIR", str(drive_dir))
    monkeypatch.setenv("ATOCORE_PROJECT_REGISTRY_PATH", str(registry_path))
    config.settings = config.Settings()
    return project_dir


def _insert_chunk(file_path, metadata=None, chunk_id="chunk-1"):
    with get_connection() as conn:
        conn.execute(
            """
            INSERT INTO source_documents (id, file_path, file_hash, title, doc_type, tags)
            VALUES (?, ?, ?, ?, ?, ?)
            """,
            ("doc-1", str(file_path), "hash", "Title", "markdown", "[]"),
        )
        conn.execute(
            """
            INSERT INTO source_chunks
                (id, document_id, chunk_index, content, heading_path, char_count, metadata)
            VALUES (?, ?, ?, ?, ?, ?, ?)
            """,
            (
                chunk_id,
                "doc-1",
                0,
                "content",
                "Overview",
                7,
                json.dumps(metadata if metadata is not None else {}),
            ),
        )


class FakeVectorStore:
    def __init__(self, metadatas):
        self.metadatas = dict(metadatas)
        self.updated = []

    def get_metadatas(self, ids):
        returned_ids = [chunk_id for chunk_id in ids if chunk_id in self.metadatas]
        return {
            "ids": returned_ids,
            "metadatas": [self.metadatas[chunk_id] for chunk_id in returned_ids],
        }

    def update_metadatas(self, ids, metadatas):
        self.updated.append((list(ids), list(metadatas)))
        for chunk_id, metadata in zip(ids, metadatas, strict=True):
            self.metadatas[chunk_id] = metadata


def test_backfill_dry_run_is_non_mutating(tmp_data_dir, tmp_path, monkeypatch):
    init_db()
    project_dir = _write_registry(tmp_path, monkeypatch)
    _insert_chunk(project_dir / "status.md")

    result = backfill.backfill(apply=False)

    assert result["updates"] == 1
    with get_connection() as conn:
        row = conn.execute("SELECT metadata FROM source_chunks WHERE id = ?", ("chunk-1",)).fetchone()
    assert json.loads(row["metadata"]) == {}


def test_backfill_apply_updates_chroma_then_sql(tmp_data_dir, tmp_path, monkeypatch):
    init_db()
    project_dir = _write_registry(tmp_path, monkeypatch)
    _insert_chunk(project_dir / "status.md", metadata={"source_file": "status.md"})
    fake_store = FakeVectorStore({"chunk-1": {"source_file": "status.md"}})
    monkeypatch.setattr(backfill, "get_vector_store", lambda: fake_store)

    result = backfill.backfill(apply=True, require_chroma_snapshot=True)

    assert result["applied_updates"] == 1
    assert fake_store.metadatas["chunk-1"]["project_id"] == "p04-gigabit"
    with get_connection() as conn:
        row = conn.execute("SELECT metadata FROM source_chunks WHERE id = ?", ("chunk-1",)).fetchone()
    assert json.loads(row["metadata"])["project_id"] == "p04-gigabit"


def test_backfill_apply_requires_snapshot_confirmation(tmp_data_dir, tmp_path, monkeypatch):
    init_db()
    project_dir = _write_registry(tmp_path, monkeypatch)
    _insert_chunk(project_dir / "status.md")

    try:
        backfill.backfill(apply=True)
    except ValueError as exc:
        assert "Chroma backup" in str(exc)
    else:
        raise AssertionError("Expected snapshot confirmation requirement")


def test_backfill_missing_vector_skips_sql_update(tmp_data_dir, tmp_path, monkeypatch):
    init_db()
    project_dir = _write_registry(tmp_path, monkeypatch)
    _insert_chunk(project_dir / "status.md")
    fake_store = FakeVectorStore({})
    monkeypatch.setattr(backfill, "get_vector_store", lambda: fake_store)

    result = backfill.backfill(apply=True, require_chroma_snapshot=True)

    assert result["updates"] == 1
    assert result["applied_updates"] == 0
    assert result["missing_vectors"] == 1
    with get_connection() as conn:
        row = conn.execute("SELECT metadata FROM source_chunks WHERE id = ?", ("chunk-1",)).fetchone()
    assert json.loads(row["metadata"]) == {}


def test_backfill_skips_malformed_metadata(tmp_data_dir, tmp_path, monkeypatch):
    init_db()
    project_dir = _write_registry(tmp_path, monkeypatch)
    _insert_chunk(project_dir / "status.md", metadata=[])

    result = backfill.backfill(apply=False)

    assert result["updates"] == 0
    assert result["malformed_metadata"] == 1