import os
import sys
import time
import logging
from datetime import datetime


term_width = 90

TOTAL_BAR_LENGTH = 40
last_time = time.time()
begin_time = last_time


def progress_bar(current, total, msg1=None, msg2=None):
    global last_time, begin_time
    if current == 0:
        begin_time = time.time()

    cur_len = int(TOTAL_BAR_LENGTH * current / total)
    rest_len = int(TOTAL_BAR_LENGTH - cur_len) - 1

    sys.stdout.write(' [')
    for i in range(cur_len):
        sys.stdout.write('=')
    sys.stdout.write('>')
    for i in range(rest_len):
        sys.stdout.write('.')
    sys.stdout.write(']')

    cur_time = time.time()
    step_time = cur_time - last_time
    last_time = cur_time
    tot_time = cur_time - begin_time

    L = []
    L.append('  Step: %s' % format_time(step_time))
    L.append(' | Tot: %s' % format_time(tot_time))
    if msg1:
        L.append(' | ' + msg1)

    msg = ''.join(L)
    sys.stdout.write(msg)
    for i in range(term_width - int(TOTAL_BAR_LENGTH) - len(msg) - 3):
        sys.stdout.write(' ')

    # Go back to the center of the bar.
    for i in range(term_width - int(TOTAL_BAR_LENGTH / 2)):
        sys.stdout.write('\b')
    sys.stdout.write(' %d/%d ' % (current + 1, total))
    if msg2:
        sys.stdout.write('\n')
        sys.stdout.write(msg2)
        sys.stdout.write('\n')
    else:
        if current < total - 1:
            sys.stdout.write('\r')
        else:
            sys.stdout.write('\n')
    sys.stdout.flush()


def format_time(seconds):
    days = int(seconds / 3600 / 24)
    seconds = seconds - days * 3600 * 24
    hours = int(seconds / 3600)
    seconds = seconds - hours * 3600
    minutes = int(seconds / 60)
    seconds = seconds - minutes * 60
    secondsf = int(seconds)
    seconds = seconds - secondsf
    millis = int(seconds * 1000)

    f = ''
    i = 1
    if days > 0:
        f += str(days) + 'D'
        i += 1
    if hours > 0 and i <= 2:
        f += str(hours) + 'h'
        i += 1
    if minutes > 0 and i <= 2:
        f += str(minutes) + 'm'
        i += 1
    if secondsf > 0 and i <= 2:
        f += str(secondsf) + 's'
        i += 1
    if millis > 0 and i <= 2:
        f += str(millis) + 'ms'
        i += 1
    if f == '':
        f = '0ms'
    return f


def init_log(output_dir):

    logging.basicConfig(level=logging.DEBUG,
                        format='%(asctime)s %(message)s',
                        datefmt='%Y%m%d-%H:%M:%S',
                        filename=os.path.join(output_dir, datetime.now().strftime('%Y%m%d_%H%M%S')+'.log'),
                        filemode='w')
    console = logging.StreamHandler()
    console.setLevel(logging.INFO)
    logging.getLogger('').addHandler(console)
    return logging


def set_mp(processes=8):
    import multiprocessing as mp

    def init_worker():
        import signal
        signal.signal(signal.SIGINT, signal.SIG_IGN)

    global pool
    try:
        pool.terminate()
    except:
        pass

    if processes:
        pool = mp.Pool(processes=processes, initializer=init_worker)
    else:
        pool = None
    return pool