from __future__ import annotations

from flask import Blueprint, current_app, jsonify, request

from app.models import Person, Role
from app.services.attendance import last_presence_summary
from app.services.recognition import RecognitionUnavailable, recognize_faces
from app.services.security import roles_required

bp = Blueprint("recognition", __name__, url_prefix="/recognition")


@bp.post("/identify")
@roles_required(Role.ADMIN, Role.OPERATOR)
def identify():
    image = request.form.get("image", "")
    if not image:
        return jsonify({"error": "No image was provided."}), 400

    people = Person.query.filter_by(active=True).all()
    try:
        result = recognize_faces(image, people, tolerance=current_app.config["FACE_MATCH_TOLERANCE"])
    except RecognitionUnavailable as exc:
        return jsonify({"error": str(exc)}), 503
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 400

    faces = []
    for face in result.faces:
        if not face.person:
            faces.append({"matched": False, "confidence": None})
            continue
        faces.append(
            {
                "matched": True,
                "person_id": face.person.id,
                "full_name": face.person.full_name,
                "employee_id": face.person.employee_id,
                "confidence": round(face.confidence, 3) if face.confidence is not None else None,
                "last_presence": last_presence_summary(face.person),
            }
        )

    return jsonify({"faces": faces, "annotated_image": result.annotated_image})