from flask import Flask, jsonify, request, Response
from service import UniversityService
from db import db

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://university_user:password@university_db:5432/universitydb'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db.init_app(app)

university_service = UniversityService()


@app.route('/universities', methods=['GET', 'POST'])
def handle_universities():
    if request.method == 'POST':
        dto = request.get_json()['dto']
        university = university_service.create_university(dto['name'])
        return jsonify(university)

    universities = university_service.get_all_universities()
    return jsonify(universities)


@app.route('/universities/<int:university_id>', methods=['GET', 'PUT', 'DELETE'])
def handle_university(university_id):
    if request.method == 'PUT':
        dto = request.get_json()['dto']
        updated_university = university_service.update_university(university_id, dto['name'])
        return jsonify(updated_university) if updated_university else Response(status=404)

    elif request.method == 'DELETE':
        university_service.delete_university(university_id)
        return Response(status=200)

    university = university_service.get_university(university_id)
    if university is None:
        return Response(status=404)
    return jsonify(university)

@app.route('/universities/<int:university_id>/faculties', methods=['POST'])
def add_faculty(university_id):
    dto = request.get_json()
    faculty_id = dto['faculty_id']
    university_service.add_faculty_to_university(university_id, faculty_id)
    return Response(status=204)

@app.route('/universities/<int:university_id>/faculties/<int:faculty_id>', methods=['DELETE'])
def remove_faculty(university_id, faculty_id):
    university_service.remove_faculty_from_university(university_id, faculty_id)
    return Response(status=204)


if __name__ == '__main__':
    app.run(host='0.0.0.0', use_reloader=False, port=8081)