from __future__ import annotations

from fastapi import APIRouter, HTTPException, Query

from backend.database import db
from backend.schemas import CaseCreate, CaseListResponse, CaseResponse, CaseUpdate

router = APIRouter(prefix='/api/v1/cases', tags=['cases'])


@router.post('', response_model=CaseResponse)
def create_case(payload: CaseCreate) -> dict:
    data = payload.model_dump(exclude_none=True)
    gps = data.pop('gps', None) or {}
    note = data.pop('note', None)
    if note is not None and 'notes' not in data:
        data['notes'] = note
    if gps:
        data['gps_lat'] = gps.get('lat')
        data['gps_lon'] = gps.get('lon')
    case = db.create_case(**data)
    if data.get('status'):
        db.update_case(case.id, status=data['status'])
    return case.to_detail()


@router.get('', response_model=CaseListResponse)
def list_cases(page: int = Query(default=1, ge=1), page_size: int = Query(default=20, ge=1, le=100)) -> dict:
    cases = db.list_cases()
    start = (page - 1) * page_size
    end = start + page_size
    items = [c.to_detail() for c in cases[start:end]]
    return {'items': items, 'total': len(cases), 'page': page, 'page_size': page_size}


@router.get('/{case_id}', response_model=CaseResponse)
def get_case(case_id: str) -> dict:
    case = db.get_case(case_id)
    if not case:
        raise HTTPException(status_code=404, detail='Case not found')
    return case.to_detail()


@router.patch('/{case_id}', response_model=CaseResponse)
def patch_case(case_id: str, payload: CaseUpdate) -> dict:
    data = payload.model_dump(exclude_none=True)
    note = data.pop('note', None)
    if note is not None and 'notes' not in data:
        data['notes'] = note
    case = db.update_case(case_id, **data)
    if not case:
        raise HTTPException(status_code=404, detail='Case not found')
    return case.to_detail()


@router.delete('/{case_id}')
def delete_case(case_id: str) -> dict[str, bool]:
    deleted = db.delete_case(case_id)
    if not deleted:
        raise HTTPException(status_code=404, detail='Case not found')
    return {'deleted': True}