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"""
calculate_score
"""
import os
import re
import json
import scoring
from nltk.translate.bleu_score import sentence_bleu, SmoothingFunction
from nltk.tokenize import word_tokenize
from Levenshtein import distance

class Scoring:
    """
    calculate_score 
    """
    def __init__(self, result_path):
        """
        init
        """
        self.edit_distances = []
        self.bleu_scores = []
        self.sim_scores = []
        self.filenames = []
        self.score_dict = {}
        self.anntion_cnt = 0
        self.fw = open(result_path, "w+", encoding='utf-8')

    def simple_bleu_score(self, candidate, reference):
        """
        get bleu score
        """
        candidate_tokens = word_tokenize(candidate)
        reference_tokens = word_tokenize(reference)
        return sentence_bleu([reference_tokens], candidate_tokens, smoothing_function=SmoothingFunction().method1)


    def preprocess_string(self, s):
        """
        preprocess_string
        """
        sub_enter = re.sub(r'\n+', '\n', s)
        return re.sub(r'  ', ' ', sub_enter)
    
    def calculate_similarity(self, annotion, actual, tool_type):
        """
        calculate_similarity
        """
        class_dict = {}
        edit_distances = []
        bleu_scores = []
        sim_scores = list()
        total_file = 0
        for filename in os.listdir(annotion):
            if filename.endswith('.md') and not filename.startswith('.'):
                total_file = total_file + 1
                with open(os.path.join(annotion, filename), 'r', encoding='utf-8') as file_a:
                    content_a = file_a.read()
                self.anntion_cnt = self.anntion_cnt + 1
                filepath_b = os.path.join(actual, filename)
                if os.path.exists(filepath_b):
                    with open(filepath_b, 'r', encoding='utf-8') as file_b:
                        content_b = file_b.read()
                        self.filenames.append(filename)
                        edit_dist = distance(self.preprocess_string(content_b),self.preprocess_string(content_a)) / max(len(content_a), len(content_b))
                        self.edit_distances.append(edit_dist)
                        edit_distances.append(edit_dist)
                        bleu_score = self.simple_bleu_score(content_b, content_a)
                        bleu_scores.append(bleu_score)
                        self.bleu_scores.append(bleu_score)
                        score = scoring.score_text(content_b, content_a)
                        sim_scores.append(score)
                        self.sim_scores.append(score)
                        class_dict[filename] = {"edit_dist": edit_dist, "bleu_score": bleu_score, "sim_score": score}
                        self.score_dict[filename] = {"edit_dist": edit_dist, "bleu_score": bleu_score, "sim_score": score}
                else:  
                    print(f"File {filename} not found in actual directory.")
        class_average_edit_distance = sum(edit_distances) / len(edit_distances) if edit_distances else 0
        class_average_bleu_score = sum(bleu_scores) / len(bleu_scores) if bleu_scores else 0
        class_average_sim_score = sum(sim_scores) / len(sim_scores) if sim_scores else 0
        self.fw.write(json.dumps(class_dict, ensure_ascii=False) + "\n")
        ratio = len(class_dict)/total_file
        self.fw.write(f"{tool_type} extract ratio:  {ratio}" + "\n")
        self.fw.write(f"{tool_type} Average Levenshtein Distance: {class_average_edit_distance}" + "\n")
        self.fw.write(f"{tool_type} Average BLEU Score: {class_average_bleu_score}" + "\n")
        self.fw.write(f"{tool_type} Average Sim Score: {class_average_sim_score}" + "\n")
        print (f"{tool_type} extract ratio: {ratio}")
        print (f"{tool_type} Average Levenshtein Distance: {class_average_edit_distance}")
        print (f"{tool_type} Average BLEU Score: {class_average_bleu_score}")
        print (f"{tool_type} Average Sim Score: {class_average_sim_score}")
        return self.score_dict
    
    def summary_scores(self):
        """
        calculate the average of edit distance, bleu score and sim score
        """
        over_all_dict = dict()
        average_edit_distance = sum(self.edit_distances) / len(self.edit_distances) if self.edit_distances else 0  
        average_bleu_score = sum(self.bleu_scores) / len(self.bleu_scores) if self.bleu_scores else 0  
        average_sim_score = sum(self.sim_scores) / len(self.sim_scores) if self.sim_scores else 0
        over_all_dict["average_edit_distance"] = average_edit_distance
        over_all_dict["average_bleu_score"] = average_bleu_score
        over_all_dict["average_sim_score"] = average_sim_score
        self.fw.write(json.dumps(over_all_dict, ensure_ascii=False) + "\n")
        return over_all_dict

    def calculate_similarity_total(self, tool_type, download_dir):
        """
        calculate the average of edit distance, bleu score and sim score
        """
        annotion = os.path.join(download_dir, "annotations", "cleaned")
        actual = os.path.join(download_dir, tool_type, "cleaned")
        score = self.calculate_similarity(annotion, actual, tool_type)
        return score