""" Scheduler for action to make """


from logging import exception


class Scheduler:
    def __init__(self, actions: list):
        self.actions = actions
        self._tasks = []
        self._done = []

    @property
    def tasks(self):
        return self._tasks

    @property
    def done(self):
        return self._done

    def append(self, tasks):
        self._tasks += tasks

    def dispatch(self, task):
        """Do a task"""
        ans = self.actions[task.action](task.deps, task.args)
        return ans

    def __iter__(self):
        return self
    def __next__(self):
        return self.next()

    def next(self):
        undoable = []

        try:
            task = self._tasks.pop(0)
        except IndexError:
            raise StopIteration

        while not all([d in self.done for d in task.deps]):
            undoable.append(task)
            try:
                task = self._tasks.pop(0)
            except IndexError:
                self.append(undoable)
                raise StopIteration

        self.append(undoable)
        ans = self.dispatch(task)
        self._done.append(ans)
        return ans

    def run(self):
        for i in self:
            pass