from __future__ import annotations

import json
from pathlib import Path
from types import SimpleNamespace
from uuid import uuid4

from app.models import Area, Dataset
from app.services.qa_service import QaService


class FakeSession:
    def __init__(self, datasets=None, areas=None):
        self.datasets = {item.id: item for item in (datasets or [])}
        self.areas = {item.id: item for item in (areas or [])}

    def get(self, model, item_id):
        if model.__name__ == "Dataset":
            return self.datasets.get(item_id)
        if model.__name__ == "Area":
            return self.areas.get(item_id)
        return None


def _write_dataset(path: Path, coordinates: list[list[list[float]]]) -> None:
    payload = {
        "type": "FeatureCollection",
        "features": [
            {
                "type": "Feature",
                "properties": {},
                "geometry": {
                    "type": "Polygon",
                    "coordinates": coordinates,
                },
            },
        ],
    }
    path.write_text(json.dumps(payload), encoding="utf-8")


def test_qa_compare_candidate_with_reference_returns_metrics(tmp_path) -> None:
    project_id = uuid4()
    candidate_id = uuid4()
    reference_id = uuid4()
    candidate_path = tmp_path / "candidate.geojson"
    reference_path = tmp_path / "reference.geojson"
    polygon = [[[4.0, 51.0], [4.1, 51.0], [4.1, 51.1], [4.0, 51.1], [4.0, 51.0]]]
    _write_dataset(candidate_path, polygon)
    _write_dataset(reference_path, polygon)

    candidate = Dataset(
        id=candidate_id,
        project_id=project_id,
        name="candidate.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(candidate_path),
        crs="EPSG:4326",
        metadata_json={"crs_assumed": False},
    )
    reference = Dataset(
        id=reference_id,
        project_id=project_id,
        name="reference.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(reference_path),
        crs="EPSG:4326",
        metadata_json={"crs_assumed": False},
    )

    result = QaService.compare_candidate_with_reference(
        db=FakeSession([candidate, reference]),
        project_id=project_id,
        candidate_dataset_id=candidate_id,
        reference_dataset_id=reference_id,
        iou_threshold=0.5,
    )

    assert result.status == "ok"
    assert result.matches == 1
    assert result.false_positives == 0
    assert result.false_negatives == 0
    assert result.precision == 1.0
    assert result.recall == 1.0
    assert result.f1_score == 1.0


def test_dataset_reference_metadata_migration_declares_required_columns() -> None:
    migration_path = Path(__file__).parents[1] / "alembic" / "versions" / "202606120001_add_dataset_reference_metadata.py"
    migration_text = migration_path.read_text(encoding="utf-8")
    for column_name in (
        "dataset_role",
        "source_name",
        "reference_layer_name",
        "source_metadata",
        "provenance_metadata",
        "imported_at",
    ):
        assert column_name in migration_text