from __future__ import annotations

from fastapi import APIRouter, Depends, Request
from sqlalchemy.orm import Session

from app.api.guest_scope import assert_guest_project_scope
from app.core.errors import AppError
from app.db.session import get_db
from app.models import Dataset
from app.schemas import Envelope, JobRead
from app.schemas.analysis import ChangeDetectionRequest
from app.services.change_detection_service import ChangeDetectionService
from app.services.job_service import JobService
from app.utils.response import envelope

router = APIRouter(prefix="/analysis", tags=["analysis"])


@router.post("/change-detection", response_model=Envelope[JobRead])
def run_change_detection(
    payload: ChangeDetectionRequest,
    request: Request,
    db: Session = Depends(get_db),
) -> dict:
    source_dataset = db.get(Dataset, payload.source_dataset_id)
    if not source_dataset:
        raise AppError(code="DATASET_NOT_FOUND", message="Source dataset not found", status_code=404)
    assert_guest_project_scope(request, source_dataset.project_id)
    ChangeDetectionService._get_project_vector_dataset(db, payload.source_dataset_id, source_dataset.project_id, "Source")
    ChangeDetectionService._get_project_vector_dataset(db, payload.target_dataset_id, source_dataset.project_id, "Target")
    job = JobService.run_sync_job(
        db=db,
        project_id=source_dataset.project_id,
        job_type="analysis.change-detection",
        parameters=payload.model_dump(mode="json"),
        input_dataset_id=payload.source_dataset_id,
        operation=lambda: ChangeDetectionService.compare_vector_datasets(
            db=db,
            project_id=source_dataset.project_id,
            source_dataset_id=payload.source_dataset_id,
            target_dataset_id=payload.target_dataset_id,
            iou_threshold=payload.iou_threshold,
            modified_threshold=payload.modified_threshold,
            include_unchanged=payload.include_unchanged,
            bbox=payload.bbox.model_dump() if payload.bbox is not None else None,
            area_id=payload.area_id,
            preview_limit=payload.preview_limit,
        ).model_dump(mode="json"),
    )
    return envelope(job)