#!/usr/bin/python
import time
import datetime
import pytz
import numpy
import random
import gzip
import zipfile
import sys
import argparse
from faker import Faker
from random import randrange

#todo:
# allow writing different patterns (Common Log, Apache Error log etc)
# log rotation


class switch(object):
    def __init__(self, value):
        self.value = value
        self.fall = False

    def __iter__(self):
        """Return the match method once, then stop"""
        yield self.match
        raise StopIteration

    def match(self, *args):
        """Indicate whether or not to enter a case suite"""
        if self.fall or not args:
            return True
        elif self.value in args: # changed for v1.5, see below
            self.fall = True
            return True
        else:
            return False

parser = argparse.ArgumentParser(__file__, description="Fake Apache Log Generator")
parser.add_argument("--output", "-o", dest='output_type', help="Write to a Log file, a gzip file or to STDOUT", choices=['LOG','GZ','CONSOLE'] )
parser.add_argument("--num", "-n", dest='num_lines', help="Number of lines to generate (0 for infinite)", type=int, default=1)
parser.add_argument("--prefix", "-p", dest='file_prefix', help="Prefix the output file name", type=str)
parser.add_argument("--sleep", "-s", help="Sleep this long between lines (in seconds)", default=0.0, type=float)

args = parser.parse_args()

log_lines = args.num_lines
file_prefix = args.file_prefix
output_type = args.output_type

faker = Faker()

timestr = time.strftime("%Y%m%d-%H%M%S")
otime = datetime.datetime.now()

outFileName = 'access_log_'+timestr+'.log' if not file_prefix else file_prefix+'_access_log_'+timestr+'.log'

for case in switch(output_type):
	if case('LOG'):
		f = open(outFileName,'w')
		break
	if case('GZ'):
		f = gzip.open(outFileName+'.gz','w')
		break
	if case('CONSOLE'): pass
	if case():
		f = sys.stdout

response=["200","404","500","301"]

verb=["GET","POST","DELETE","PUT"]

resources=["/list","/wp-content","/wp-admin","/explore","/search/tag/list","/app/main/posts","/posts/posts/explore","/apps/cart.jsp?appID="]

ualist = [faker.firefox, faker.chrome, faker.safari, faker.internet_explorer, faker.opera]

flag = True
while (flag):
	if args.sleep:
		increment = datetime.timedelta(seconds=args.sleep)
	else:
		increment = datetime.timedelta(seconds=random.randint(30, 300))
	otime += increment

	ip = faker.ipv4()
	dt = otime.strftime('%d/%b/%Y:%H:%M:%S')
	tz = datetime.datetime.now().strftime('%z')
	vrb = numpy.random.choice(verb,p=[0.6,0.1,0.1,0.2])

	uri = random.choice(resources)
	if uri.find("apps")>0:
		uri += `random.randint(1000,10000)`

	resp = numpy.random.choice(response,p=[0.9,0.04,0.02,0.04])
	byt = int(random.gauss(5000,50))
	referer = faker.uri()
	useragent = numpy.random.choice(ualist,p=[0.5,0.3,0.1,0.05,0.05] )()
	f.write('%s - - [%s %s] "%s %s HTTP/1.0" %s %s "%s" "%s"\n' % (ip,dt,tz,vrb,uri,resp,byt,referer,useragent))

	log_lines = log_lines - 1
	flag = False if log_lines == 0 else True
	if args.sleep:
		time.sleep(args.sleep)