# Created By: Virgil Dupras
# Created On: 2011-04-20
# Copyright 2012 Hardcoded Software (http://www.hardcoded.net)
# 
# This software is licensed under the "BSD" License as described in the "LICENSE" file, 
# which should be included with this package. The terms are also available at 
# http://www.hardcoded.net/licenses/bsd_license

import logging
from collections import defaultdict
from itertools import combinations

from hscommon import io
from hscommon.trans import tr

from core.engine import Match
from . import exif

def getmatches(files, match_scaled, j):
    timestamp2pic = defaultdict(set)
    for picture in j.iter_with_progress(files, tr("Read EXIF of %d/%d pictures")):
        try:
            with io.open(picture.path, 'rb') as fp:
                exifdata = exif.get_fields(fp)
                timestamp = exifdata['DateTimeOriginal']
                timestamp2pic[timestamp].add(picture)
        except Exception:
            logging.info("Couldn't read EXIF of picture: %s", picture.path)
    if '0000:00:00 00:00:00' in timestamp2pic: # very likely false matches
        del timestamp2pic['0000:00:00 00:00:00']
    matches = []
    for pictures in timestamp2pic.values():
        for p1, p2 in combinations(pictures, 2):
            if (not match_scaled) and (p1.dimensions != p2.dimensions):
                continue
            matches.append(Match(p1, p2, 100))
    return matches