#!/usr/bin/env python3
# vi: encoding=utf-8 ts=8 sts=4 sw=4 et

from __future__ import print_function

import sys, os
import getopt
sys.path.insert(0, os.environ['HOME']+'/tld-ftp-admin/modules')
import ftptree
import getpass
from common import checkdir
import ftpio
from config import sign_key
from sign import is_signed, signpkgs

os.umask(0o022)

try:
    opts, args = getopt.getopt(sys.argv[1:], '')
except getopt.GetoptError:
    print("ERR: options error", file=sys.stderr)
    print("sign.py tree package1 [package2...]", file=sys.stderr)
    sys.exit(1)

if len(args) < 1:
    print("ERR: missing tree name", file=sys.stderr)
    print("sign.py tree package1 [package2...]", file=sys.stderr)
    sys.exit(1)

if sign_key == None:
    print("ERR: sign_key not defined in config", file=sys.stderr)
    sys.exit(1)

treename = args[0]
packages = args[1:]

checkdir(treename)

ftpio.connect('sign')

if not ftpio.lock(treename, True):
    print("ERR: %s tree already locked" % treename, file=sys.stderr)
    sys.exit(1)

files = []
try:
    if len(packages) < 1:
        loadall = True
    else:
        loadall = False

    # if no files specified, grab whole tree contents
    tree = ftptree.FtpTree(treename, loadall = loadall)
    if loadall:
        # this is hack, should be a param, not access private .loadedpkgs element
        tree.mark4moving(tree.loadedpkgs)
    else:
        tree.mark4moving(packages)
    files = tree.rpmfiles()

except ftptree.SomeError:
    # In case of problems we need to unlock the tree before exiting
    ftpio.unlock(treename)
    sys.exit(1)

ftpio.unlock(treename)

print("Checking signatures of %d files from %d packages" % (len(files), len(tree.loadedpkgs)))
sign = []
n = c = 0
for file in files:
    if not is_signed(file):
        sign.append(file)
        c += 1
    n += 1
    print("\r%d/%d %s\033[0K" % (n, c, file), end='')

print()

if len(sign) == 0:
    print("No files to sign")
    sys.exit(0)

# http://mail.python.org/pipermail/python-list/2009-February/700658.html
def chunk(seq, size, pad=None):
     '''
     Slice a list into consecutive disjoint 'chunks' of
     length equal to size. The last chunk is padded if necessary.

     >>> list(chunk(range(1,10),3))
     [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
     >>> list(chunk(range(1,9),3))
     [[1, 2, 3], [4, 5, 6], [7, 8, None]]
     >>> list(chunk(range(1,8),3))
     [[1, 2, 3], [4, 5, 6], [7, None, None]]
     >>> list(chunk(range(1,10),1))
     [[1], [2], [3], [4], [5], [6], [7], [8], [9]]
     >>> list(chunk(range(1,10),9))
     [[1, 2, 3, 4, 5, 6, 7, 8, 9]]
     >>> for X in chunk([],3): print(X)
     >>>
     '''
     n = len(seq)
     mod = n % size
     for i in range(0, n - mod, size):
         yield seq[i : i + size]
     if mod:
         yield seq[-mod:]

print("Total %d files to sign" % len(sign))
password = getpass.getpass("Enter signing password: ")
try:
    for x in chunk(sign, 512):
        print("Signing %d files" % len(x))
        signpkgs(x, password)
except OSError as e:
    print("ERR: %s" % e, file=sys.stderr)
    exit(1)