from ..models import Dataset, Entry
from ..tools.test import evaluate_answers, generate_questions

from flask import Blueprint, jsonify, request

from datetime import datetime, timedelta
from json import loads

api = Blueprint(
    name='api',
    import_name=__name__
)

@api.route('/questions/', methods=['POST'])
def _fetch_questions():
    id = request.get_json()['id']
    entry = Entry.query.filter_by(id=id).first()
    if not entry: return jsonify({'error': 'Invalid entry ID.'}), 400
    test = entry['test']
    user_code = entry['user_code']
    time_limit = test['time_limit']
    time_adjustment = 0
    if time_limit:
        _time_limit = int(time_limit)
        if user_code:
            time_adjustment = test['time_adjustments'][user_code]
            _time_limit += time_adjustment
        end_delta = timedelta(minutes=_time_limit)
        end_time = datetime.utcnow() + end_delta
    else:
        end_time = None
    entry.start()
    dataset = test['dataset']
    success, message = dataset.check_file()
    if not success: return jsonify({'error': message}), 500
    data_path = dataset.get_file()
    with open(data_path, 'r') as data_file:
        data = loads(data_file.read())
    questions = generate_questions(data)
    return jsonify({
        'time_limit': end_time,
        'questions': questions,
        'start_time': entry['start_time'],
        'time_adjustment': time_adjustment
    }), 200

@api.route('/submit/', methods=['POST'])
def _submit_quiz():
    id = request.get_json()['id']
    answers = request.get_json()['answers']
    entry = Entry.query.filter_by(id=id).first()
    if not entry: return jsonify({'error': 'Unrecognised ID.'}), 400
    test = entry['test']
    dataset = test['dataset']
    success, message = dataset.check_file()
    if not success: return jsonify({'error': message}), 500
    data_path = dataset.get_file()
    with open(data_path, 'r') as data_file:
        data = loads(data_file.read())
    result = evaluate_answers(answers=answers, key=data)
    entry.complete(answers=answers, result=result)
    return jsonify({
        'success': 'Your submission has been processed. Redirecting you to receive your results.',
        'id': id
    }), 200