import json
from copy import deepcopy
from flowtimer.Phase import Phase


class RecurringPhaseSequence:

    @classmethod
    def from_json(cls, a_json_string):
        def custom_object_hook(d):
            if 'title' in d and 'initial_ticks' in d:
                return Phase(d['title'], d['initial_ticks'])
            if 'phase_list' in d and 'initial_repetitions' in d:
                return RecurringPhaseSequence(d["title"], d['phase_list'], d['initial_repetitions'])
            print("Wrong format")
            return d
        return json.loads(a_json_string, object_hook=custom_object_hook)

    @classmethod
    def default_json_string(cls):
        return json.dumps({"title": "default",
                           "phase_list": [{"title": "Huddle", "initial_ticks": 10},
                                          {"title": "Tasking", "initial_ticks": 5},
                                          {"title": "Work", "initial_ticks": 45},
                                          {"title": "Break", "initial_ticks": 15}],
                           "initial_repetitions": 3})

    @classmethod
    def default(cls):
        return cls.from_json(cls.default_json_string())

    def __init__(self, title, phase_list, repetitions):
        assert repetitions > 0
        assert phase_list is not []
        self._title = title
        self.state = "initial"
        self.phase_list = phase_list
        self.current_phase = phase_list[0]
        self.initial_repetitions = repetitions
        self.passes_left = repetitions

    def to_json(self):
        return json.dumps(self.__dict__, default=lambda each: each.to_json())

    @property
    def title(self):
        return self.current_phase.title

    def current_phase_number(self):
        return self.phase_list.index(self.current_phase)

    def phases_left_in_pass(self):
        return len(self.upcoming_phases_in_pass())

    def upcoming_phases_in_pass(self):
        if self.current_phase_number() < len(self.phase_list) - 1:
            return self.phase_list[self.current_phase_number()+1:]
        return []

    @property
    def initial_ticks(self):
        return sum([each.initial_ticks for each in self.phase_list])

    @property
    def ticks_left(self):
        return (
            (self.passes_left-1) * sum([each.initial_ticks for each in self.phase_list]) +
            self.current_phase.ticks_left +
            sum([each.ticks_left for each in self.upcoming_phases_in_pass()]))

    def finished(self):
        return (self.passes_left < 1) and (not self.upcoming_phases_in_pass())

    def abort(self):
        self.current_phase.abort()
        self.state = "finished"

    def start(self):
        self.state = "running"

    def tick(self, ticks):
        if not self.finished():
            result = self.current_phase.tick(ticks)
            if self.current_phase.finished():
                if self.upcoming_phases_in_pass():
                    self.current_phase.reset()
                    self.current_phase = self.upcoming_phases_in_pass()[0]
                    self.current_phase.start()
                    self.tick(abs(result))
                    return True
                self.passes_left -= 1
                if self.finished():
                    self.state = "finished"
                else:
                    self.current_phase.reset()
                    self.current_phase = self.phase_list[0]
        return True

    def unrolled(self):
        return [deepcopy(seq) for seq in [each for each in self.initial_repetitions * self.phase_list]]