#!/usr/bin/env python3
import unittest
import re
from datetime import datetime
import collections
import sys


splitter = re.compile(r"(\S+) \S+ \S+ \[([^:]+):(\d+:\d+:\d+) ([^]]+)] "
                             r"\S+ (\S+) \S+ \S+ \S+ \"([^\"]+)\" "
                             r"\"([^\"]+)\"\s*(\d*)")

class Stat:
    def __init__(self):
        self.fastest_page = ('', 99999999)
        self.slowest_page = ('', -1)
        self.avg_page_speed_stat = collections.Counter()
        self.date_client_stat = {}
        self.browser_stat = collections.Counter()
        self.page_stat = collections.Counter()
        self.general_client_stat = collections.Counter()

    def add_line(self, line):
        splitted_line = re.split(splitter, line)
        if len(splitted_line) < 8:
            return
        page = splitted_line[5]
        date = splitted_line[2]
        client = splitted_line[1]
        browser = splitted_line[7]
        if all((page, client, browser)):
            self.page_stat[page] += 1
            self.browser_stat[browser] += 1
            if date not in self.date_client_stat:
                self.date_client_stat[date] = collections.Counter()
            self.date_client_stat[date][client] += 1
            time = splitted_line[8]
            if time:
                time = int(time)
                if time <= self.fastest_page[1]:
                    self.fastest_page = (page, time)
                if time >= self.slowest_page[1]:
                    self.slowest_page = (page, time)
                if page not in self.avg_page_speed_stat:
                    self.avg_page_speed_stat[page] = (time, 1)
                else:
                    count = self.avg_page_speed_stat[page][1]
                    self.avg_page_speed_stat[page] = (
                        (self.avg_page_speed_stat[page][0] * count + time)
                        / (count + 1), count + 1)

    def create_client_stat(self):
        date_stat_client = {}
        for key in self.date_client_stat.keys():
            self.general_client_stat += self.date_client_stat[key]
            new_key = datetime.strptime(key, '%d/%b/%Y').date()
            date_stat_client[new_key] = self.date_client_stat[key].most_common(1)[0][0]
        self.date_client_stat = date_stat_client

    def results(self):
        self.create_client_stat()
        result = {
            'FastestPage': self.fastest_page[0],
            'MostActiveClient': self.general_client_stat.most_common(1)[0][0],
            'MostActiveClientByDay': self.date_client_stat,
            'MostPopularBrowser': self.browser_stat.most_common(1)[0][0],
            'MostPopularPage': self.page_stat.most_common(1)[0][0],
            'SlowestAveragePage': self.avg_page_speed_stat.most_common(1)[0][0],
            'SlowestPage': self.slowest_page[0]
            }

        return result


def make_stat():
    return Stat()


#class LogStatTests(unittest.TestCase):
    # TODO: add unit tests