import importlib
from threading import Thread, Lock

import matplotlib.pyplot as plt

from loader import dmt


def calc_intervals(posts):
    firstpost = dmt(posts).reduce(lambda acc, e: acc if acc < e['CreationDate'] else e['CreationDate'], lambda acc, e: acc if acc < e else e, lambda: posts[0]['CreationDate'],
                                  "firstpost").getresults()
    lastpost = dmt(posts).reduce(lambda acc, e: acc if acc > e['CreationDate'] else e['CreationDate'], lambda acc, e: acc if acc > e else e, lambda: posts[0]['CreationDate'], "lastpost").getresults()

    # calc quarter beginning
    firstpost = firstpost.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
    if firstpost.month not in (1, 4, 7, 10):
        firstpost = firstpost.replace(month={1: 1, 2: 1, 3: 1, 4: 4, 5: 4, 6: 4, 7: 7, 8: 7, 9: 7, 10: 10, 11: 10, 12: 10}[firstpost.month])
    lastpost = lastpost.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
    if lastpost.month not in (1, 4, 7, 10):
        lastpost = lastpost.replace(month={1: 1, 2: 1, 3: 1, 4: 4, 5: 4, 6: 4, 7: 7, 8: 7, 9: 7, 10: 10, 11: 10, 12: 10}[lastpost.month])
    # add 3 months to last post
    if lastpost.month == 10:
        lastpost = lastpost.replace(month=1, year=lastpost.year + 1)
    else:
        lastpost = lastpost.replace(month=lastpost.month + 3)

    cdate = firstpost
    intervals = []
    while cdate < lastpost:
        nextquarter = cdate.replace(month=(cdate.month + 3) % 12, year=cdate.year + (0 if cdate.month + 3 < 12 else 1))
        print("adding interval: " + cdate.strftime("%d-%m-%Y") + " - " + nextquarter.strftime("%d-%m-%Y"))
        intervals.append((cdate, nextquarter))
        cdate = nextquarter
    return intervals


def imprt(file):
    spec = importlib.util.spec_from_file_location("module.name", file)
    foo = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(foo)
    return foo


class FigSaver():
    def __init__(self):
        self.__lock = Lock()
        self.__threads = []

    def save(self, fig, path, **kwargs):
        thread = Thread(target=self.__dosave, args=(fig, path, kwargs))
        with self.__lock:
            self.__threads.append(thread)
        thread.start()

    def __dosave(self, fig, path, kwargs):
        fig.savefig(path, **kwargs)
        plt.close(fig)

    def join(self):
        with self.__lock:
            for thread in self.__threads:
                thread.join()