from connector import get_connexion
import json
import math


class Timeslot:
    def __init__(self, ut_start, duration):
        self.ut_start = ut_start
        self.duration = duration

    @property
    def ut_end(self):
        return self.ut_start + self.duration

    @ut_end.setter
    def ut_end(self, value):
        self.duration = value - self.start


class ManeuverScheduler:

    # alarm_manager = get_connexion().space_center.alarm_manager
    alarm_manager = get_connexion().kerbal_alarm_clock
    node_offsets = 60.
    default_duration = 5 * 60.

    @classmethod
    def get_last_alarm(cls):
        return cls.get_ordered_alarms()[0]

    @classmethod
    def get_ordered_alarms(cls):
        return sorted(cls.alarm_manager.alarms, key=lambda el: el.time)

    @classmethod
    def book_timeslot_for_node(cls, vessel, node, maneuver, alarm_start=None, duration=None):
        time_required = (node.delta_v * vessel.mass) / vessel.available_thrust
        if duration is None:
            duration = math.floor(2 * cls.node_offsets + time_required)

        description = {
            'duration': duration,
            'vessel_name': vessel.name
        }

        # arg_dict = {
        #    'title': "{}' Maneuver: {}".format(vessel.name, maneuver.name),
        #    'description': json.dumps(description),
        #    'offset': cls.node_offsets
        # }

        # cls.alarm_manager.add_maneuver_node_alarm(
        #    vessel,
        #    vessel.control.nodes[0],
        #    **arg_dict)
        if alarm_start is None:
            alarm_start = node.ut - (duration / 2 + cls.node_offsets)

        if not cls.timeslot_is_free(alarm_start, duration):
            raise

        alarm = cls.alarm_manager.create_alarm(
            cls.alarm_manager.AlarmType.maneuver,
            "{}' Maneuver: {}".format(vessel.name, maneuver.name),
            alarm_start
        )
        alarm.vessel = vessel
        # alarm.margin = cls.node_offsets
        alarm.notes = json.dumps(description)
        alarm.action = cls.alarm_manager.AlarmAction.kill_warp_only

    @classmethod
    def book_timeslot(cls, ut, vessel, duration=None):
        if duration is None:
            duration = cls.default_duration

        if not cls.timeslot_is_free(ut, duration):
            raise

        description = {
            'duration': duration,
            'vessel_name': vessel.name
        }

        alarm = cls.alarm_manager.create_alarm(
            cls.alarm_manager.AlarmType.raw,
            "{}' Timeslot".format(vessel.name),
            ut
        )
        alarm.vessel = vessel
        alarm.margin = cls.node_offsets
        alarm.notes = json.dumps(description)
        alarm.action = cls.alarm_manager.AlarmAction.kill_warp_only


    @classmethod
    def book_timeslot_for_soi(cls, vessel, maneuver, duration=None):
        if duration is None:
            duration = cls.default_duration

        soi_change = vessel.orbit.time_to_soi_change
        if math.isnan(soi_change):
            raise

        ut_start = get_connexion().space_center.ut + soi_change
        if not cls.timeslot_is_free(ut_start, duration):
            raise

        notes = {
            'duration': duration,
            'vessel_name': vessel.name
        }

        alarm = cls.alarm_manager.create_alarm(
            cls.alarm_manager.AlarmType.soi_change,
            "{}' SOI".format(vessel.name),
            ut_start
        )
        alarm.vessel = vessel
        alarm.margin = cls.node_offsets
        alarm.notes = json.dumps(notes)
        alarm.action = cls.alarm_manager.AlarmAction.kill_warp_only

    @classmethod
    def timeslot_is_free(cls, ut_start: int, duration: int) -> bool:
        ut_end = ut_start + duration
        for a in cls.get_ordered_alarms():
            try:
                notes = json.loads(a.notes)
                alarm_start = a.time
                alarm_end = a.time + notes['duration']
                if alarm_end < ut_start:
                    continue
                elif alarm_start <= ut_start <= alarm_end:
                    return False
                elif ut_start <= alarm_end <= ut_end:
                    return False
                else:
                    return True
            except json.JSONDecodeError:
                continue

        return True

    @classmethod
    def next_free_timeslot(cls, from_ut=None, duration=None) -> int:
        if from_ut is None:
            from_ut = get_connexion().space_center.ut
        if duration is None:
            duration = cls.default_duration

        if cls.timeslot_is_free(from_ut, duration):
            return from_ut

        for a in cls.get_ordered_alarms():
            try:
                notes = json.loads(a.notes)
                alarm_end = a.time + int(notes['duration'])
                if cls.timeslot_is_free(alarm_end + 1, duration):
                    return alarm_end + 1
            except json.JSONDecodeError:
                continue

        raise EOFError('Excepted to find a free timeslot at the end alarm list')

    @classmethod
    def get_reservation(cls, ut_at) -> Timeslot:
        pass

    @classmethod
    def delete_reservation(cls, ut_at, priority):
        reservation = cls.get_reservation(ut_at)
        if priority <= reservation.priority:
            raise