from __future__ import annotations

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

from geoalchemy2.shape import to_shape
from shapely.geometry import Point, box

import sys


REPOSITORY_ROOT = Path(__file__).resolve().parents[1]
BACKEND_ROOT = REPOSITORY_ROOT / "backend"
if str(BACKEND_ROOT) not in sys.path:
    sys.path.insert(0, str(BACKEND_ROOT))

from app.core.config import Settings  # noqa: E402
from app.schemas.area import AreaUpdate  # noqa: E402
from app.services.coverage_registry_service import (  # noqa: E402
    CoverageRegistryService,
    SOURCE_DEFINITIONS,
)
from app.services.detection_service import DetectionService  # noqa: E402
from app.services.vector_feature_service import VectorFeatureService  # noqa: E402


FIXED_UUID = UUID("00000000-0000-4000-8000-000000000001")


def _dataset(*, layer: str, bbox_values: list[float], source_name: str = "spw_picc") -> SimpleNamespace:
    return SimpleNamespace(
        id=FIXED_UUID,
        status="ready",
        source_name=source_name,
        reference_layer_name=layer,
        source_metadata={"coverage_zones": ["wallonia"], "bbox_epsg4326": bbox_values},
        provenance_metadata={},
        observed_at=None,
        source_version="forensic-reproduction",
        resolution_json=None,
        checksum_sha256="forensic-only",
    )


def _coverage_cross_theme_contamination() -> dict:
    definition = next(
        item for item in SOURCE_DEFINITIONS if item.contract.source_name == "spw_geoportail"
    )
    selection = box(4.50, 50.50, 4.70, 50.60)
    building = _dataset(layer="buildings", bbox_values=[4.55, 50.52, 4.56, 50.53])
    road = _dataset(layer="roads", bbox_values=[4.50, 50.50, 4.70, 50.60])
    matches, fully_covered = CoverageRegistryService._matching_datasets(
        [building, road],
        definition,
        "buildings",
        "wallonia",
        selection,
    )
    observed_ids = [str(item.id) for item in matches]
    reproduced = observed_ids == [str(building.id)] and fully_covered is True
    return {
        "id": "P1-COV-001",
        "severity": "critical",
        "source": "backend/app/services/coverage_registry_service.py:481-505",
        "expected": "A small buildings partition remains partial; a roads bbox cannot complete buildings coverage.",
        "observed": {"matched_dataset_ids": observed_ids, "fully_covered": fully_covered},
        "reproduced": reproduced,
    }


def _meter_buffer_as_degrees() -> dict:
    geometry = Point(5.0, 51.0)
    buffered = geometry.buffer(100.0)
    bounds = [float(value) for value in buffered.bounds]
    reproduced = round(bounds[2] - bounds[0], 6) == 200.0
    return {
        "id": "P1-CRS-001",
        "severity": "critical",
        "source": "backend/app/services/vector_operations_service.py:179-203",
        "expected": "A 100 metre buffer is projected to a metric CRS and spans roughly hundreds of metres.",
        "observed": {"bounds_epsg4326": bounds, "longitude_span_degrees": bounds[2] - bounds[0]},
        "reproduced": reproduced,
    }


def _lambert_feature_mislabeled() -> dict:
    row = VectorFeatureService._feature_row(
        FIXED_UUID,
        {
            "type": "Feature",
            "geometry": {"type": "Point", "coordinates": [150000.0, 210000.0]},
            "properties": {},
        },
        0,
        None,
    )
    assert row is not None
    geometry = to_shape(row.geometry)
    reproduced = (
        int(row.geometry.srid) == 4326
        and float(geometry.x) == 150000.0
        and float(geometry.y) == 210000.0
    )
    return {
        "id": "P1-CRS-002",
        "severity": "critical",
        "source": "backend/app/services/vector_feature_service.py:271-299",
        "expected": "Non-WGS84 input is transformed to EPSG:4326 or rejected before persistence.",
        "observed": {
            "stored_srid": int(row.geometry.srid),
            "stored_coordinates": [float(geometry.x), float(geometry.y)],
        },
        "reproduced": reproduced,
    }


def _authority_spoof() -> dict:
    selection = box(4.9, 50.9, 5.0, 51.0)
    dataset = SimpleNamespace(
        id=FIXED_UUID,
        status="ready",
        source_name="grb",
        reference_layer_name="buildings",
        source_metadata={
            "coverage_zones": ["flanders"],
            "bbox_epsg4326": [4.8, 50.8, 5.1, 51.1],
        },
        provenance_metadata={"provided_by": "caller"},
        observed_at=None,
        source_version="caller-provided",
        resolution_json=None,
        checksum_sha256="caller-provided",
        crs="EPSG:4326",
    )
    item = CoverageRegistryService._resolve_item(
        zone="flanders",
        theme="buildings",
        datasets=[dataset],
        selection=selection,
    )
    authority = item.evidence[0].authority_level if item.evidence else None
    reproduced = item.status == "operational" and authority == "authoritative"
    return {
        "id": "P1-AUTH-001",
        "severity": "critical",
        "source": (
            "backend/app/api/routes/datasets.py:142-163; "
            "backend/app/services/coverage_registry_service.py:463-559"
        ),
        "expected": "Only server-attested source identities can produce authoritative operational coverage.",
        "observed": {
            "caller_controlled_source_name": dataset.source_name,
            "coverage_status": item.status,
            "reported_authority": authority,
        },
        "reproduced": reproduced,
    }


def _mutable_name_model_scope() -> dict:
    area = SimpleNamespace(name="Mol validation bypass", geometry=box(-75.0, 35.0, -74.9, 35.1))
    dataset = SimpleNamespace(id=FIXED_UUID, area_id=FIXED_UUID)

    class FakeSession:
        @staticmethod
        def get(_model, _identifier):
            return area

    settings = Settings().model_copy(
        update={"yolo_validated_area_names": "Mol,Kempen"}
    )
    accepted = True
    try:
        DetectionService._validate_model_area_scope(FakeSession(), dataset, settings)
    except Exception:
        accepted = False
    return {
        "id": "P1-AI-001",
        "severity": "critical",
        "source": "backend/app/services/detection_service.py:223-232",
        "expected": "Validation scope is bound to immutable geometry/source/checksum evidence.",
        "observed": {
            "area_name": area.name,
            "geometry_bounds": [float(value) for value in area.geometry.bounds],
            "accepted": accepted,
        },
        "reproduced": accepted,
    }


def _mutable_name_legal_scope() -> dict:
    selection = box(4.9, 50.9, 5.0, 51.0)
    flemish_geometry = box(2.5, 50.7, 5.9, 51.5)
    canonical = [SimpleNamespace(name="Flanders", geometry=flemish_geometry)]
    renamed = [SimpleNamespace(name="Vlaanderen", geometry=flemish_geometry)]
    canonical_zones, canonical_outside = CoverageRegistryService._intersected_zones(
        canonical, selection
    )
    renamed_zones, renamed_outside = CoverageRegistryService._intersected_zones(
        renamed, selection
    )
    reproduced = (
        canonical_zones == ["flanders"]
        and canonical_outside is False
        and renamed_zones == []
        and renamed_outside is True
    )
    return {
        "id": "P1-COV-002",
        "severity": "high",
        "source": "backend/app/services/coverage_registry_service.py:56-65,425-447",
        "expected": "Renaming an Area cannot change its legal coverage-zone identity.",
        "observed": {
            "canonical": {"zones": canonical_zones, "outside": canonical_outside},
            "renamed_same_geometry": {"zones": renamed_zones, "outside": renamed_outside},
        },
        "reproduced": reproduced,
    }


def _area_patch_ignores_geometry() -> dict:
    payload = AreaUpdate.model_validate(
        {
            "name": "Renamed",
            "geometry": {
                "type": "Polygon",
                "coordinates": [[[4.0, 50.0], [5.0, 50.0], [5.0, 51.0], [4.0, 50.0]]],
            },
        }
    )
    parsed = payload.model_dump()
    reproduced = "geometry" not in parsed
    return {
        "id": "P1-API-001",
        "severity": "high",
        "source": "backend/app/schemas/area.py:15-17; backend/app/services/area_service.py:154-171",
        "expected": "PATCH /areas/{area_id} either validates and applies geometry or rejects the field.",
        "observed": {"parsed_payload": parsed, "geometry_silently_ignored": reproduced},
        "reproduced": reproduced,
    }


def main() -> int:
    findings = [
        _coverage_cross_theme_contamination(),
        _meter_buffer_as_degrees(),
        _lambert_feature_mislabeled(),
        _authority_spoof(),
        _mutable_name_model_scope(),
        _mutable_name_legal_scope(),
        _area_patch_ignores_geometry(),
    ]
    reproduced_count = sum(bool(item["reproduced"]) for item in findings)
    payload = {
        "schema_version": 1,
        "purpose": "Read-only deterministic reproductions of Phase-1 contract violations.",
        "findings": findings,
        "summary": {
            "total": len(findings),
            "reproduced": reproduced_count,
            "all_reproduced": reproduced_count == len(findings),
        },
    }
    print(json.dumps(payload, indent=2, sort_keys=True))
    return 0 if reproduced_count == len(findings) else 1


if __name__ == "__main__":
    raise SystemExit(main())