from __future__ import annotations

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

from app.core.errors import AppError
from app.services import geojson_service
from app.services.dataset_service import DatasetService


def test_parse_geojson_payload_extracts_metadata() -> None:
    payload = {
        "type": "FeatureCollection",
        "features": [
            {
                "type": "Feature",
                "geometry": {
                    "type": "Point",
                    "coordinates": [4.5, 51.3],
                },
            }
        ],
    }

    metadata = geojson_service.parse_geojson_payload(payload)

    assert metadata["feature_count"] == 1
    assert metadata["feature_geometry_count"] == 1
    assert metadata["bounds_json"] == {
        "min_x": 4.5,
        "min_y": 51.3,
        "max_x": 4.5,
        "max_y": 51.3,
    }
    assert metadata["geometry_types"] == ["Point"]


def test_parse_geojson_payload_rejects_non_feature_collection() -> None:
    payload = {"type": "Feature", "features": []}

    try:
        geojson_service.parse_geojson_payload(payload)
    except ValueError as exc:
        assert "FeatureCollection" in str(exc)
    else:
        raise AssertionError("Invalid GeoJSON should raise ValueError")


def test_get_dataset_geojson_reads_stored_payload(tmp_path, monkeypatch) -> None:
    file_path = tmp_path / "dataset.geojson"
    file_path.write_text(
        json.dumps({"type": "FeatureCollection", "features": []}),
        encoding="utf-8",
    )

    dataset = SimpleNamespace(dataset_type="vector", storage_path=str(file_path))
    monkeypatch.setattr(DatasetService, "get_dataset", lambda _db, _id: dataset)

    payload = DatasetService.get_dataset_geojson(Path("."), uuid4())

    assert payload["type"] == "FeatureCollection"


def test_get_dataset_geojson_rejects_invalid_stored_json(tmp_path, monkeypatch) -> None:
    file_path = tmp_path / "invalid.geojson"
    file_path.write_text("not-json", encoding="utf-8")

    dataset = SimpleNamespace(dataset_type="vector", storage_path=str(file_path))
    monkeypatch.setattr(DatasetService, "get_dataset", lambda _db, _id: dataset)

    try:
        DatasetService.get_dataset_geojson(Path("."), uuid4())
    except AppError as exc:
        assert exc.code == "INVALID_GEOJSON"
    else:
        raise AssertionError("Invalid stored payload should raise AppError")


def test_parse_geojson_payload_returns_vector_metadata() -> None:
    payload = {
        "type": "FeatureCollection",
        "features": [
            {
                "type": "Feature",
                "geometry": {
                    "type": "Polygon",
                    "coordinates": [
                        [
                            [4.3, 51.2],
                            [4.4, 51.2],
                            [4.4, 51.3],
                            [4.3, 51.3],
                            [4.3, 51.2],
                        ]
                    ],
                },
            }
        ],
        "crs": {"type": "name", "properties": {"name": "EPSG:31370"}},
    }

    metadata = geojson_service.parse_geojson_payload(payload)

    assert metadata["feature_count"] == 1
    assert metadata["feature_geometry_count"] == 1
    assert metadata["geometry_types"] == ["Polygon"]
    assert metadata["bounds_json"] == {
        "min_x": 4.3,
        "min_y": 51.2,
        "max_x": 4.4,
        "max_y": 51.3,
    }
    assert metadata["crs"] == "EPSG:31370"
    assert metadata["approximate_area_m2"] is not None
    assert metadata["approximate_area_m2"] >= 0.0


def test_parse_geojson_payload_reports_z_dimension_for_canonical_2d_storage() -> None:
    metadata = geojson_service.parse_geojson_payload(
        {
            "type": "FeatureCollection",
            "features": [
                {
                    "type": "Feature",
                    "geometry": {"type": "Point", "coordinates": [5.08, 51.18, 0.0]},
                    "properties": {},
                }
            ],
        }
    )

    assert metadata["z_dimension_feature_count"] == 1
    assert metadata["canonical_storage_dimension"] == "2D"


def test_parse_geojson_payload_rejects_invalid_geometry() -> None:
    payload = {
        "type": "FeatureCollection",
        "features": [
            {
                "type": "Feature",
                "geometry": {
                    "type": "Polygon",
                    "coordinates": "invalid",
                },
            }
        ],
    }

    try:
        geojson_service.parse_geojson_payload(payload)
    except ValueError as exc:
        assert "Invalid feature geometry" in str(exc)
    else:
        raise AssertionError("Invalid geometry should raise ValueError")


def test_get_dataset_geojson_accepts_legacy_geojson_type(tmp_path, monkeypatch) -> None:
    file_path = tmp_path / "legacy.geojson"
    file_path.write_text(
        json.dumps({"type": "FeatureCollection", "features": []}),
        encoding="utf-8",
    )

    dataset = SimpleNamespace(dataset_type="geojson", storage_path=str(file_path))
    monkeypatch.setattr(DatasetService, "get_dataset", lambda _db, _id: dataset)

    payload = DatasetService.get_dataset_geojson(Path("."), uuid4())
    assert payload["type"] == "FeatureCollection"


def test_vector_summary_supports_legacy_geojson_type(monkeypatch) -> None:
    dataset = SimpleNamespace(
        dataset_type="geojson",
        metadata_json={
            "feature_count": 7,
            "geometry_types": ["Point"],
            "bounds_json": {"min_x": 0.0, "min_y": 0.0, "max_x": 1.0, "max_y": 1.0},
        },
        storage_path="",
    )
    monkeypatch.setattr(DatasetService, "get_dataset", lambda _db, _id: dataset)

    summary = DatasetService.vector_summary(Path("."), uuid4())
    assert summary["feature_count"] == 7
    assert summary["geometry_types"] == ["Point"]