import datetime
import cv2
import numpy as np

from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
from sqlalchemy.orm import Session

from app.database.database import get_db
from app.database.models import Attendance
from app.services.face_detector import detect_faces
from app.services.embedding import get_embedding
from app.services.recognition import load_all_persons, identify_person

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


@router.post("/")
async def take_attendance(
    file: UploadFile = File(...),
    db: Session = Depends(get_db),
):
    """
    Register attendance from an uploaded image.
    """

    known_persons = load_all_persons(db)

    if not known_persons:
        raise HTTPException(
            status_code=400,
            detail="لا يوجد أشخاص مسجلين"
        )

    # قراءة الصورة
    contents = await file.read()

    image = cv2.imdecode(
        np.frombuffer(contents, np.uint8),
        cv2.IMREAD_COLOR,
    )

    if image is None:
        raise HTTPException(
            status_code=400,
            detail="الصورة غير صالحة"
        )

    # كشف جميع الوجوه
    boxes = detect_faces(image)

    if len(boxes) == 0:
        raise HTTPException(
            status_code=400,
            detail="لم يتم العثور على أي وجه"
        )

    present = []

    today = datetime.date.today()

    for box in boxes:

        x1, y1, x2, y2 = box

        face_crop = image[y1:y2, x1:x2]

        if face_crop.size == 0:
            continue

        embedding = get_embedding(face_crop)

        person_id, name, score = identify_person(
            embedding,
            known_persons
        )

        if person_id is None:
            present.append({
                "name": "Unknown",
                "score": round(float(score), 4)
            })
            continue

        already_exists = (
            db.query(Attendance)
            .filter(
                Attendance.person_id == person_id,
                Attendance.date == today,
            )
            .first()
        )

        if not already_exists:

            attendance = Attendance(
                person_id=person_id,
                date=today,
                time=datetime.datetime.now().time(),
                status="Present",
            )

            db.add(attendance)
            db.commit()

        present.append({
            "id": person_id,
            "name": name,
            "score": round(float(score), 4),
            "status": "Present",
        })

    return {
        "count": len(present),
        "results": present,
    }