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# coding=utf-8

import threading

from db.models import Problem
import server
import server.user_session

__all__ = ['RobotSession']

class RobotSession(server.LanguageSession):
    """Abstracts a Robot session.
    Only public methods are available to the outside world due to the use of multiprocessing managers.
    Therefore prefix any private methods with an underscore (_).
    No properties are accessible; use getters and setters instead.
    Values are passed by value instead of by reference (deep copy!).
    """
    def __init__(self, output_cb=None):
        self._access_lock = threading.Lock()
        self._sent_hints = []

    def destroy(self):
        pass

    def __del__(self):
        pass

    def hint(self, sid, problem_id, program):
        p = Problem.get(id=problem_id)
        language_module = server.problems.load_language(p.language, 'common')
        problem_module = server.problems.load_problem(p.language, p.group, p.identifier, 'common')

        hints = []
        if hasattr(language_module, 'hint'):
            hints = language_module.hint(program)
        if not hints and hasattr(problem_module, 'hint'):
            hints = problem_module.hint(program)
        if not hints:
            hints = [{'id': 'no_hint'}]

        self._instantiate_and_save_hints(language_module, problem_module, hints)
        return hints

    def test(self, sid, problem_id, program):
        p = Problem.get(id=problem_id)
        language_module = server.problems.load_language(p.language, 'common')
        problem_module = server.problems.load_problem(p.language, p.group, p.identifier, 'common')

        try:
            passed, hints = problem_module.test(program)
            if passed:
                session = server.user_session.get_session_by_id(sid)
                session.update_solution(problem_id, done=True)
        except AttributeError as ex:
            hints = [{'id': 'system_error', 'args': {'message': 'test function does not exist'}}]

        self._instantiate_and_save_hints(language_module, problem_module, hints)
        return hints

    # Add hint parameters (such as message index) based on hint class. Append
    # the finalized hints to the list of sent hints.
    def _instantiate_and_save_hints(self, language_mod, problem_mod, hints):
        with self._access_lock:
            for hint in hints:
                for mod in [language_mod, problem_mod]:
                    if hasattr(mod, 'hint_type') and hint['id'] in mod.hint_type:
                        hint_type = mod.hint_type[hint['id']]
                        hint_type.instantiate(hint, self._sent_hints)
            self._sent_hints.extend(hints)

server.language_session_handlers['robot'] = lambda user_session, problem_id, language_identifier, group_identifier, problem_identifier: RobotSession()