#!/usr/bin/env python

import os
import sys


def find_match(src_path_list, files_list, name):
    rv = []
    for p,f in zip(src_path_list, files_list):
        if name in f:
            rv.append(p)
    return rv

def process(dst_path, src_path_list):
    # Check destination
    if not os.path.exists(dst_path):
        os.mkdir(dst_path)

    # File list for each sources
    files_list = [set(os.listdir(x)) for x in src_path_list]

    # Find all entries and count hits
    files_all = set()
    for fl in files_list:
        files_all.update(fl)

    # Exclude .git
    files_all.discard('.git')

    # Process all entries
    for n in files_all:
        # Destination
        dp = os.path.join(dst_path, n)

        # Find matchings path
        mp = find_match(src_path_list, files_list, n)

        # Single hit -> Direct link
        if len(mp) == 1:
            print "Direct single : %s" % n
            sp = os.path.join(mp[0],n)
            os.symlink(sp, dp)

        # Multiple hit, but normal file -> Direct link
        elif not os.path.isdir(os.path.join(mp[0], n)):
            print "Direct file   : %s" % n
            sp = os.path.join(mp[0],n)
            os.symlink(sp, dp)

        # Multiple hits and directory -> Recurse
        else:
            print "Recurse       : %s" % n
            process(dp, [os.path.join(x,n) for x in mp])


def main(argv0, dst, *srcs):
    process(
        os.path.abspath(dst),
        [os.path.abspath(x) for x in srcs]
    )

if __name__ == '__main__':
    main(*sys.argv)