#!/usr/bin/env python3

import sys
import os
import os.path
import zipfile
from shutil import copyfile
import hashlib

def md5(fname):
    hash_md5 = hashlib.md5()
    with open(fname, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            hash_md5.update(chunk)
    return hash_md5.hexdigest()

if len(sys.argv) < 4:
    print('usage: mkzip <lstfile> <dstpath> <legacy>')
    sys.exit(1)

lst = []
with open(sys.argv[1], 'r') as f:
    for line in f:
        line = line.strip()
        if line == '' or line[0] == '#':
            continue
        tok = line.split()
        lst.append((tok[0], tok[1]))
    if not sys.argv[3] or not sys.argv[3] == "1":
        for (fname, aname) in lst:
            path = os.path.join(sys.argv[2], aname)
            old_md5 = md5(fname)
            if not os.path.exists(path) or os.path.exists(path) and old_md5 != md5(path):
                os.makedirs(os.path.dirname(path), exist_ok=True)
                copyfile(fname, path)
                print("Copying: " + path)
            else:
                print("Skipping: " + path + " - MD5: "+md5(fname))
    else:
        zipPath = os.path.join(sys.argv[2], "awesome-legacy.zip")
        print("Using Legacy System")
        with zipfile.ZipFile(zipPath, 'w', allowZip64=False) as zipf:
            for (fname, aname) in lst:
                zipf.write(fname, arcname=aname)
                print("Legacy - Copying: " + aname)