from __future__ import annotations

from pathlib import Path
from uuid import UUID, uuid4

from app.core.errors import AppError
from app.models import Dataset
from app.services.storage_service import StorageService
from app.services.vector_operations_service import VectorOperationsService


class FakeSession:
    def __init__(self, datasets):
        self.datasets = {dataset.id: dataset for dataset in datasets}
        self.added = []

    def get(self, model, item_id):
        return self.datasets.get(item_id)

    def add(self, value):
        self.added.append(value)

    def commit(self):
        return None

    def refresh(self, _value):
        return None


def _make_vector_dataset(dataset_id: UUID, project_id: UUID, raw: str) -> Dataset:
    path = Path(f"./tests/.tmp_{dataset_id}.geojson")
    path.write_text(raw, encoding="utf-8")
    return Dataset(
        id=dataset_id,
        project_id=project_id,
        name=f"{dataset_id}.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(path),
        original_filename=f"{dataset_id}.geojson",
        stored_filename=f"{dataset_id}.geojson",
        content_type="application/geo+json",
    )


def test_vector_inspect_extracts_feature_count_and_bbox(tmp_path) -> None:
    dataset_id = uuid4()
    project_id = uuid4()
    source_path = tmp_path / f"{dataset_id}.geojson"
    source_path.write_text(
        '{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Point","coordinates":[4.1,51.2]}},{"type":"Feature","geometry":{"type":"Point","coordinates":[4.2,51.3]}}]}',
        encoding="utf-8",
    )

    dataset = Dataset(
        id=dataset_id,
        project_id=project_id,
        name="vector.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(source_path),
        original_filename="vector.geojson",
        stored_filename="vector.geojson",
        content_type="application/geo+json",
    )
    db = FakeSession([dataset])

    payload = VectorOperationsService.inspect(db, dataset_id)

    assert payload.feature_count == 2
    assert payload.geometry_type_summary["Point"] == 2
    assert payload.bounds_json == {"min_x": 4.1, "min_y": 51.2, "max_x": 4.2, "max_y": 51.3}


def test_vector_bbox_and_stats_share_summary(tmp_path) -> None:
    dataset_id = uuid4()
    project_id = uuid4()
    source_path = tmp_path / f"{dataset_id}.geojson"
    source_path.write_text(
        '{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Point","coordinates":[4.0,51.0]}}]}',
        encoding="utf-8",
    )
    dataset = Dataset(
        id=dataset_id,
        project_id=project_id,
        name="vector.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(source_path),
        original_filename="vector.geojson",
        stored_filename="vector.geojson",
        content_type="application/geo+json",
    )
    db = FakeSession([dataset])

    bbox = VectorOperationsService.bbox(db, dataset_id)
    stats = VectorOperationsService.stats(db, dataset_id)

    assert bbox["feature_count"] == 1
    assert stats["feature_count"] == 1
    assert stats["geometry_type_summary"]["Point"] == 1


def test_vector_intersect_creates_derived_dataset(monkeypatch, tmp_path) -> None:
    source_id = uuid4()
    target_id = uuid4()
    project_id = uuid4()
    source_path = tmp_path / f"{source_id}.geojson"
    target_path = tmp_path / f"{target_id}.geojson"
    source_path.write_text(
        '{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Point","coordinates":[4.1,51.2]}}]}',
        encoding="utf-8",
    )
    target_path.write_text(
        '{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[4.0,51.0],[4.0,52.0],[5.0,52.0],[5.0,51.0],[4.0,51.0]]]}}]}',
        encoding="utf-8",
    )

    source = Dataset(
        id=source_id,
        project_id=project_id,
        name="source.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(source_path),
        original_filename="source.geojson",
        stored_filename="source.geojson",
        content_type="application/geo+json",
    )
    target = Dataset(
        id=target_id,
        project_id=project_id,
        name="target.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(target_path),
        original_filename="target.geojson",
        stored_filename="target.geojson",
        content_type="application/geo+json",
    )
    db = FakeSession([source, target])

    persisted = {}

    def _persist_dataset_file(project_id: str, dataset_id: str, dataset_type: str, original_filename: str, content: bytes, content_type: str | None):
        persisted["project_id"] = project_id
        persisted["dataset_id"] = dataset_id
        output = tmp_path / f"{dataset_id}_{dataset_type}.geojson"
        output.write_bytes(content)
        return {
            "original_filename": original_filename,
            "stored_filename": output.name,
            "content_type": content_type or "application/geo+json",
            "size_bytes": len(content),
            "checksum_sha256": "test",
            "storage_path": str(output),
        }

    monkeypatch.setattr(StorageService, "persist_dataset_file", _persist_dataset_file)

    derived_id = VectorOperationsService.intersect(db, source_id, target_id, "intersect_output")
    assert derived_id is not None
    assert isinstance(derived_id, UUID)
    assert persisted["project_id"] == str(project_id)


def test_vector_operations_reject_invalid_geometry(tmp_path) -> None:
    dataset_id = uuid4()
    project_id = uuid4()
    source_path = tmp_path / f"{dataset_id}.geojson"
    source_path.write_text(
        '{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Polygon","coordinates":"invalid"}}]}',
        encoding="utf-8",
    )
    dataset = Dataset(
        id=dataset_id,
        project_id=project_id,
        name="invalid.geojson",
        dataset_type="vector",
        source="test",
        storage_path=str(source_path),
        original_filename="invalid.geojson",
        stored_filename="invalid.geojson",
        content_type="application/geo+json",
    )
    db = FakeSession([dataset])

    try:
        VectorOperationsService.inspect(db, dataset_id)
    except AppError as exc:
        assert exc.code == "INVALID_GEOMETRY"
    else:
        raise AssertionError("Invalid geometry should raise INVALID_GEOMETRY")