import json
from math import floor
import subprocess
from collections import defaultdict

# Maximum time for AK: 2 Timeslots
SLOT_LEN = 120

DAYS = 3
START = 480
END = 1200


class WorkGroup:
    def __init__(self, id, interest, track, projector, reso, length, leaders, constraints):
        self.id = id  # must be int
        self.interest = interest
        self.track = track if track is not None else 'none'  # haben alle aks einen track?
        self.projector = 'true' if projector else 'false'
        self.reso = 'true' if reso else 'false'
        self.length = floor((length-1) / SLOT_LEN) + 1
        # if self.length > 2:
        #     print(f"Warning, length of workgroup {id} greater than 2.")
        #     self.length = 2
        self.leaders = leaders
        self.constrainted_time = [{'day': 1, 'time': 840, 'type': 'before'}] if reso else []
        self.not_on_day = [0, 1, 2] if len(list(filter(lambda c: c['type'] == 'OnlyOnDay', constraints))) else []
        if reso and not self.not_on_day:
            self.not_on_day.append(2)
        self.only_on_day = []

        for constraint in constraints:
            if constraint["type"] == 'OnlyAfterTime':
                if constraint['workGroup'] is None:
                    self.constrainted_time.append(
                        {'day': constraint['day'], 'time': constraint['time'], 'type': 'after'})
            elif constraint["type"] == 'OnlyBeforeTime':
                self.constrainted_time.append({'day': constraint['day'], 'time': constraint['time'], 'type': 'before'})
            elif constraint['type'] == 'NotOnDay':
                self.not_on_day.append(constraint['day'])
            elif constraint['type'] == 'OnlyOnDay':
                if constraint['day'] == 2 and reso:
                    print(f'WorkGroup {id}: only on day two, but has reso. Warning, is UNSATISFIABLE!')
                self.not_on_day.remove(constraint['day'])
        # TODO: more unsat warning when reso == True

    def __str__(self):
        leader_rules = ''
        for leader in self.leaders:
            if leader.strip() != '':
                leader_rules += f'leader({self.id}, "{leader}").\n'
        return f'ak({self.id}, {self.interest}, "{self.track}", {self.projector}, {self.reso}, {self.length}).\n' + leader_rules


class Room:
    def __init__(self, id, n_places, projector, is_pool):  # TODO internet, whiteboard & co.
        self.id = id  # must be int
        self.n_places = n_places
        self.projector = 'true' if projector else 'false'
        self.is_pool = is_pool

    def __str__(self):
        pool_rule = ''
        if self.is_pool:
            pool_rule = f'\npool({self.id}).'
        return f'room({self.id}, {self.n_places}, {self.projector}).{pool_rule}'


class Timeslot:
    def __init__(self, order, timeslot):
        self.begin, self.end, self.day = timeslot
        self.id = f'{self.day}#{self.begin}#{self.end}'
        self.order = order
        # self.begin = begin
        # self.end = end
        # self.day = day

    def __str__(self):
        return f'timeslot("{self.id}", {self.order}, {self.begin}, {self.end}, {self.day}).'


class Schedule:
    def __init__(self, id, workgroup, day, time, room):
        self.id = id
        self.workgroup = workgroup
        self.room = room
        self.day = day
        self.time = time

    def to_dict(self):
        return {
            'id': self.id,
            'workGroup': self.workgroup,
            'room': self.room,
            'time': self.time,
            'day': self.day,
            'lockRoom': False,
            'lockTime': False,
        }


def parse_workgroups(data):
    workgroups = []
    id_to_index_workgroup = {}
    for i, workgroup in enumerate(data['workGroups']):
        workgroups.append(
            WorkGroup(workgroup['id'], workgroup['interested'], workgroup['track'], workgroup['projector'],
                      workgroup['resolution'], workgroup['length'], workgroup['leader'], workgroup['constraints']))
        id_to_index_workgroup[workgroup['id']] = i
    return workgroups, id_to_index_workgroup


def parse_rooms(data):
    rooms = []
    id_to_room = {}
    for i, room in enumerate(data['rooms']):
        rooms.append(Room(room['id'], room['places'], room['projector'], room['pool']))  # TODO internet, whiteboard & co.
        id_to_room[room['id']] = i
    return rooms, id_to_room


#######################
#  READ BACKUP JSON   #
#######################


data = json.load(open('backup.json'))

workgroups, id_to_index_workgroup = parse_workgroups(data)
rooms, id_to_index_room = parse_rooms(data)

rules = """
%LENGTH = { schedule(AK,TIMESLOT,ROOM): timeslot(TIMESLOT,_,_,_,_), room(ROOM,_,_) } :- ak(AK,_,_,_,_,LENGTH).
LENGTH = { schedule(AK,TIMESLOT,ROOM): timeslot(TIMESLOT,_,_,_,_), room(ROOM,_,_) } :- ak(AK,_,_,_,_,LENGTH).

% forbid 2AKS in the same room at the same time
:- schedule(AK1,TIMESLOT,ROOM), schedule(AK2,TIMESLOT,ROOM), AK1 != AK2.

% forbid ak with beamer request in room without beamer
:- schedule(AK,_,ROOM), ak(AK,_,_,true,_,_), room(ROOM,_,false).

% forbid ak in room that is too small
:- schedule(AK,_,ROOM), ak(AK,INTEREST,_,_,_,_), room(ROOM,PLACES,_), PLACES<INTEREST.

% forbid two AKs with same leader at same timestep
:- schedule(AK1,TIMESTEP,_), schedule(AK2,TIMESTEP,_), leader(AK1,LEADER), leader(AK2,LEADER), AK1 != AK2.

% schedules of longer aks should be in the same room and in consecutive timeslots, on the same day
%schedule(AK,TIMESLOT2,ROOM) :- ak(AK,_,_,_,_,LENGTH), LENGTH>1, schedule(AK,TIMESLOT1,ROOM), timeslot(TIMESLOT1,ORDER1,_,_,DAY), timeslot(TIMESLOT2,ORDER2,_,_,DAY), timeslot(TIMESLOT3,ORDER3,_,_,_), ORDER2 != ORDER1+1, ORDER1 = ORDER3+1, not schedule(AK,TIMESLOT3,ROOM) .
:- schedule(AK, TIMESLOT1, _), schedule(AK, TIMESLOT2, _), timeslot(TIMESLOT1,ORDER1,_,_,_), timeslot(TIMESLOT2,ORDER2,_,_,_), ak(AK,_,_,_,_,LENGTH), |ORDER2-ORDER1| >= LENGTH.
%same room
:- schedule(AK, _, ROOM1), schedule(AK, _, ROOM2), ROOM1 != ROOM2.
%same day
:- schedule(AK, TIMESLOT1, _), schedule(AK, TIMESLOT2, _), timeslot(TIMESLOT1, _,_,_, DAY1), timeslot(TIMESLOT2, _,_,_, DAY2), DAY1 != DAY2.
"""
lengths = defaultdict(int)
for workgroup in workgroups:
    lengths[workgroup.length] += 1
    rules += str(workgroup) + '\n'

print(lengths)

for room in rooms:
    rules += str(room) + '\n'

timeslots = [(start, start + SLOT_LEN, day) for day in range(DAYS) for start in range(START, END, SLOT_LEN)]

del timeslots[0]  # remove slot thursday morning
if DAYS >= 3: del timeslots[-1]  # remove last slot for Abschlussplenum
print(f'Number of Workgroups: {len(workgroups)}, Number of Rooms: {len(rooms)}, Number of Timeslots: {len(timeslots)}')
for order, timeslot in enumerate(timeslots):
    if order == 8:
        continue  # remove slot for Resovorstellung, keep order to avoid two-slot-workgroups to be scheduled before and after Resovorstellung.
    rules += str(Timeslot(order, timeslot)) + '\n'


############################
#   ADD MORE CONSTRAINTS   #
############################

def time_to_id(timeslots, day, time):
    timeslots = list(filter(lambda ts: time >= ts[1][0] and time < ts[1][1] and day == ts[1][2], enumerate(timeslots)))
    return timeslots[0][0]


def get_last_on_day(day):
    if day == 0:
        return 4
    else:
        return (day + 1) * 5


def get_first_on_day(day):
    if day == 3:
        return 15
    else:
        return (day) * 5


for workgroup in workgroups:
    if workgroup.constrainted_time:
        for constrainted_time in workgroup.constrainted_time:
            # TODO constraint for 2 slot workgroups missing!
            timeslot_id = time_to_id(timeslots, constrainted_time['day'], constrainted_time['time'])
            timeslot = timeslots[timeslot_id]  # after this slot: ok
            operator1 = '<' if constrainted_time['type'] == 'after' else '>'
            operator2 = '>' if constrainted_time['type'] == 'after' else '<'
            day_restriction = get_last_on_day(constrainted_time['day']) + 1 if constrainted_time[
                                                                                   'type'] == 'before' else get_first_on_day(
                constrainted_time['day']) - 1  # first or last slot on this day
            timeslot2 = timeslot_id if constrainted_time['type'] == 'before' else timeslot_id
            print(
                f':- schedule({workgroup.id}, TIMESLOT, _), timeslot(TIMESLOT, ORDER, _, _, _), ORDER {operator1} {timeslot2}, ORDER {operator2} {day_restriction}.')
            rules += f':- schedule({workgroup.id}, TIMESLOT, _), timeslot(TIMESLOT, ORDER, _, _, _), ORDER {operator1} {timeslot2}, ORDER {operator2} {day_restriction}.\n'
    if workgroup.not_on_day:
        for day in workgroup.not_on_day:
            first_timeslot = get_first_on_day(day)
            last_timeslot = get_last_on_day(day)
            print(
                f':- schedule({workgroup.id}, TIMESLOT, _), timeslot(TIMESLOT, ORDER, _, _, _), ORDER >= {first_timeslot}, ORDER <= {last_timeslot}.')
            rules += f':- schedule({workgroup.id}, TIMESLOT, _), timeslot(TIMESLOT, ORDER, _, _, _), ORDER >= {first_timeslot}, ORDER <= {last_timeslot}.\n'

rules += "pool_schedule(ROOM) :- schedule(_,_,ROOM), pool(ROOM).\n"\
        "poolpen(T) :- T = {pool_schedule(_)}.\n"\
        "#minimize { T : poolpen(T) }.\n" \
         "#show schedule/3."

#######################
#  GENERATE SCHEDULE  #
#######################

output_file_name = "generated_rules.pl"

open(output_file_name, 'w').write(rules)

# create subprocess definition
process = ['clingo', output_file_name, '--outf=2']

# run subprocess, not sure, if busy-waiting..
completed_process = subprocess.run(process, universal_newlines=True, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
output = completed_process.stdout

open('solver_output.json', 'w').write(output)

#######################
#   OUTPUT SCHEDULE   #
#######################

if 'UNSATISFIABLE' in output:
    print('UNSATISFIABLE')
    print(output)
else:
    print('SATISFIABLE, outputting schedule...')
    import re

    output = json.loads(output)

    schedules = []
    workgroup_to_schedule = defaultdict(list)
    for i, schedule in enumerate(output['Call'][0]['Witnesses'][-1]['Value']):
        match = re.match('schedule\((.+),"(.+)#(.+)#.+",(.+)\)', schedule)
        try:
            workgroup_index = id_to_index_workgroup[int(match.group(1))]
            room_id = id_to_index_room[int(match.group(4))]
            schedules.append(
                Schedule(i, data['workGroups'][workgroup_index], match.group(2), match.group(3), data['rooms'][room_id]))
            # {
            #     'id': i,
            #     'workGroup': data['workGroups'][workgroup_id],
            #     'room': data['rooms'][room_id],
            #     'time': match.group(3),
            #     'day': match.group(2),
            #     'lockRoom': False,
            #     'lockTime': False,
            # })
            workgroup_to_schedule[workgroup_index].append(i)
        except Exception as e:
            print(e)

    schedules_filtered = []

    for workgroup_index in workgroup_to_schedule:
        schedules_for_workgroup = workgroup_to_schedule[workgroup_index]
        if len(schedules_for_workgroup) == 1:
            schedules_filtered.append(schedules[schedules_for_workgroup[0]])
        else:
            # more than one schedule contains workgroup, because workgroup is 2 slots long
            # find out which one is the first one and remove the second workgroup:
            schedules_for_workgroup_0 = schedules[schedules_for_workgroup[0]]
            schedules_for_workgroup_1 = schedules[schedules_for_workgroup[1]]
            print(schedules_for_workgroup_0.time < schedules_for_workgroup_1.time)
            print(f'{schedules_for_workgroup_0.time} < {schedules_for_workgroup_1.time}')
            print(type(schedules_for_workgroup_0.time), type(schedules_for_workgroup_1.time))
            print('-------')
            if int(schedules_for_workgroup_0.time) < int(schedules_for_workgroup_1.time):
                schedules_filtered.append(schedules_for_workgroup_0)
            else:
                schedules_filtered.append(schedules_for_workgroup_1)

    data = {}
    data['schedules'] = [s.to_dict() for s in schedules_filtered]
    json.dump(data, open('output.json', 'w'))