# coding=utf-8

import operator
import prolog.engine
from server.hints import Hint, HintSequence

id = 1

hint_type = {
    'no_hint': Hint('no_hint'),
    'program_already_correct': Hint('program_already_correct'),
    'system_error': Hint('system_error'),
    'test_results': Hint('test_results'),
    'syntax_error': Hint('syntax_error'),
}

def hint(program, solved_problems):
    # Check program for syntax errors.
    engine_id, output = prolog.engine.create(code=program)
    if engine_id is not None:
        prolog.engine.destroy(engine_id)
    if 'error' in map(operator.itemgetter(0), output):
        errors_msg = '\n'.join(['{}: {}'.format(m_type, m_text) for m_type, m_text in output])
        return [{'id': 'syntax_error', 'args': {'messages': errors_msg}}]
    return []