#!/usr/bin/env python
#
# File Name : bleu.py
#
# Description : Wrapper for BLEU scorer.
#
# Creation Date : 06-01-2015
# Last Modified : Thu 19 Mar 2015 09:13:28 PM PDT
# Authors : Hao Fang <hfang@uw.edu> and Tsung-Yi Lin <tl483@cornell.edu>

from eval.bleu.bleu_scorer import BleuScorer

class Bleu:
    def __init__(self, n=4):
        # default compute Blue score up to 4
        self._n = n
        self._hypo_for_image = {}
        self.ref_for_image = {}

    def compute_score_rl(self, hypo, refs):
        bleu_scorer = BleuScorer(n=self._n)
        for i in range(len(refs)):
            bleu_scorer += (hypo[i], refs[i])
        score, scores = bleu_scorer.compute_score(option='closest', verbose=1)
        # TODO try with average ?
        return score[-1], scores[-1]

    def compute_score(self, gts, res):

        assert(gts.keys() == res.keys())
        imgIds = gts.keys()

        bleu_scorer = BleuScorer(n=self._n)
        for id in imgIds:
            hypo = res[id]
            ref = gts[id]

            # Sanity check.
            assert(type(hypo) is list)
            assert(len(hypo) == 1)
            assert(type(ref) is list)
            assert(len(ref) >= 1)

            bleu_scorer += (hypo[0], ref)

        score, scores = bleu_scorer.compute_score(option='closest', verbose=1)
        return score, scores

    def method(self):
        return "Bleu"
