#!/usr/bin/python

import itertools
import multiprocessing
import os
import sys
import shutil
import subprocess
from threading import Timer
import sys
from argparse import ArgumentParser
from subprocess import Popen, PIPE, STDOUT, call



def get_immediate_subdirectories(a_dir):
    return [a_dir]
    # return [(os.path.join(a_dir, name)) for name in os.listdir(a_dir)
    #         if os.path.isdir(os.path.join(a_dir, name))]


TMP_DIR = ""

def ParallelExtractDir(args, dir):
    ExtractFeaturesForDir(args, dir, "")


def ExtractFeaturesForDir(args, dir, prefix):
    command = ['java', '-cp', args.jar, 'JavaExtractor.App',
               '--max_path_length', str(args.max_path_length), '--max_path_width', str(args.max_path_width),
               '--dir', dir, '--num_threads', str(args.num_threads)]

    kill = lambda process: process.kill()
    outputFileName = args.output
    failed = False
    with open(outputFileName, 'a') as outputFile:
        sleeper = subprocess.Popen(command, stdout=outputFile, stderr=subprocess.PIPE)
        timer = Timer(600000, kill, [sleeper])

        try:
            timer.start()
            stdout, stderr = sleeper.communicate()
        finally:
            timer.cancel()

        if sleeper.poll() == 0:
            if len(stderr) > 0:
                print(sys.stderr, stderr, file=sys.stdout)
        else:
            print(sys.stderr, 'dir: ' + str(dir) + ' was not completed in time', file=sys.stdout)
            failed = True
            subdirs = get_immediate_subdirectories(dir)
            for subdir in subdirs:
                ExtractFeaturesForDir(args, subdir, prefix + dir.split('/')[-1] + '_')
    if failed:
        if os.path.exists(outputFileName):
            os.remove(outputFileName)


def ExtractFeaturesForDirsList(args, dirs):
    global TMP_DIR
    TMP_DIR = "./tmp/feature_extractor%d/" % (os.getpid())
    if os.path.exists(TMP_DIR):
        shutil.rmtree(TMP_DIR, ignore_errors=True)
    os.makedirs(TMP_DIR)
    try:
        p = multiprocessing.Pool(4)
        p.starmap(ParallelExtractDir, zip(itertools.repeat(args), dirs))
        #for dir in dirs:
        #    ExtractFeaturesForDir(args, dir, '')
        output_files = os.listdir(TMP_DIR)
        for f in output_files:
            os.system("cat %s/%s" % (TMP_DIR, f))
    finally:
        shutil.rmtree(TMP_DIR, ignore_errors=True)


if __name__ == '__main__':
    parser = ArgumentParser()
    parser.add_argument("-maxlen", "--max_path_length", dest="max_path_length", required=False, default=8)
    parser.add_argument("-maxwidth", "--max_path_width", dest="max_path_width", required=False, default=2)
    parser.add_argument("-threads", "--num_threads", dest="num_threads", required=False, default=64)
    parser.add_argument("-j", "--jar", dest="jar", required=True)
    parser.add_argument("-dir", "--dir", dest="dir", required=False)
    parser.add_argument("-output", "--output", dest="output", required=False)
    parser.add_argument("-file", "--file", dest="file", required=False)
    args = parser.parse_args()

    if args.file is not None:
        command = 'java -cp ' + args.jar + ' JavaExtractor.App --max_path_length ' + \
                  str(args.max_path_length) + ' --max_path_width ' + str(args.max_path_width) + ' --file ' + args.file
        os.system(command)
    elif args.dir is not None:
        subdirs = get_immediate_subdirectories(args.dir)
        to_extract = subdirs
        if len(subdirs) == 0:
            to_extract = [args.dir.rstrip('/')]
        ExtractFeaturesForDirsList(args, to_extract)


