from flask import Blueprint, request, jsonify
from flask_jwt_extended import jwt_required
from flasgger.utils import swag_from
from models.service import Service, db
from models.service_instance import ServiceInstance  # Relacionado ao modelo Service

service_bp = Blueprint('service', __name__, url_prefix='/services')

@service_bp.route('/', methods=['POST'])
@jwt_required()
@swag_from('../docs/services/create.yml')
def create_service():
    data = request.get_json()

    # Cria um novo serviço
    service = Service(
        name=data['name'],
        description=data.get('description')
    )

    db.session.add(service)
    db.session.commit()

    return jsonify({'message': 'Serviço criado com sucesso', 'id': service.id}), 201

@service_bp.route('/', methods=['GET'])
@jwt_required()
@swag_from('../docs/services/list.yml')
def list_services():
    page = request.args.get('page', 1, type=int)
    per_page = request.args.get('per_page', 10, type=int)

    pagination = Service.query.paginate(page=page, per_page=per_page, error_out=False)
    services = pagination.items

    return jsonify({
        'services': [
            {
                'id': service.id,
                'name': service.name,
                'description': service.description,
                'created_at': service.created_at,
                'updated_at': service.updated_at
            } for service in services
        ],
        'total': pagination.total,
        'page': pagination.page,
        'per_page': pagination.per_page
    }), 200


@service_bp.route('/<int:service_id>', methods=['GET'])
@jwt_required()
@swag_from('../docs/services/get_by_id.yml')
def get_service(service_id):
    service = Service.query.get_or_404(service_id)
    return jsonify({
        'id': service.id,
        'name': service.name,
        'description': service.description,
        'created_at': service.created_at,
        'updated_at': service.updated_at
    }), 200


@service_bp.route('/<int:service_id>', methods=['PUT'])
@jwt_required()
@swag_from('../docs/services/update.yml')
def update_service(service_id):
    data = request.get_json()
    service = Service.query.get_or_404(service_id)

    # Atualiza os campos fornecidos
    if 'name' in data and data['name'] != service.name:
        service.name = data['name']

    if 'description' in data:
        service.description = data['description']

    db.session.commit()

    return jsonify({'message': 'Serviço atualizado com sucesso'}), 200


@service_bp.route('/<int:service_id>', methods=['DELETE'])
@jwt_required()
@swag_from('../docs/services/delete.yml')
def delete_service(service_id):
    service = Service.query.get_or_404(service_id)

    # Verifica se há instâncias relacionadas antes de excluir
    if service.instances:
        return jsonify({'message': 'Não é possível excluir o serviço. Existem instâncias associadas.'}), 400

    db.session.delete(service)
    db.session.commit()

    return jsonify({'message': 'Serviço excluído com sucesso'}), 200


@service_bp.route('/<int:service_id>/instances', methods=['GET'])
@jwt_required()
@swag_from('../docs/services/get_instances.yml')
def get_service_instances(service_id):
    service = Service.query.get_or_404(service_id)

    # Recupera as instâncias relacionadas ao serviço
    instances = ServiceInstance.query.filter_by(service_id=service.id).all()

    if not instances:
        return jsonify({'message': 'Nenhuma instância encontrada para este serviço'}), 404

    instance_data = [
        {
            'id': instance.id,
            'name': instance.name,  # Exemplo de campo, ajuste de acordo com ServiceInstance
            # 'status': instance.status,  # Exemplo de campo
            'created_at': instance.created_at
        } for instance in instances
    ]

    return jsonify({'instances': instance_data}), 200