import os
import re
import argparse
import pandas as pd

# !pip install python-Levenshtein
from Levenshtein import distance

import sys
sys.path.append('../')
from utilities import *


def get_most_similar(prediction, choices):
    """
    Use the Levenshtein distance (or edit distance) to determine which of the choices is most similar to the given prediction
    """
    distances = [distance(prediction, choice) for choice in choices]
    ind = distances.index(min(distances))
    return choices[ind]
    # return min(choices, key=lambda choice: distance(prediction, choice))


def normalize_extracted_answer(extraction, choices, question_type, answer_type, precision):
    """
    Normalize the extracted answer to match the answer type
    """
    if question_type == 'multi_choice':
        # make sure the extraction is a string
        if isinstance(extraction, str):
            extraction = extraction.strip()
        else:
            try:
                extraction = str(extraction)
            except:
                extraction = ""
    
        # extract "A" from "(A) text"
        letter = re.findall(r'\(([a-zA-Z])\)', extraction)
        if len(letter) > 0:
            extraction = letter[0].upper()
        
        options = [chr(ord('A') + i) for i in range(len(choices))]
            
        if extraction in options:
            # convert option letter to text, e.g. "A" -> "text"
            ind = options.index(extraction)
            extraction = choices[ind]
        else:
            # select the most similar option
            extraction = get_most_similar(extraction, choices)
        assert extraction in choices

    elif answer_type == 'integer':
        try:
            extraction = str(int(float(extraction)))
        except:
            extraction = None

    elif answer_type == 'float':
        try:
            extraction = str(round(float(extraction), precision))
        except:
            extraction = None
        
    elif answer_type == 'list':
        try:
            extraction = str(extraction)
        except:
            extraction = None

    return extraction
    

def safe_equal(prediction, answer):
    """
    Check if the prediction is equal to the answer, even if they are of different types
    """
    try:
        if prediction == answer:
            return True
        return False
    except Exception as e:
        print(e)
        return False


def get_acc_with_contion(res_pd, key, value):
    if key == 'skills':
        # if value in res_pd[key]:
        total_pd = res_pd[res_pd[key].apply(lambda x: value in x)]
    else:
        total_pd = res_pd[res_pd[key] == value]

    correct_pd = total_pd[total_pd['true_false'] == True]
    acc = "{:.2f}".format(len(correct_pd) / len(total_pd) * 100)
    return len(correct_pd), len(total_pd), acc
        
if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--output_file', type=str, default='output.json')
    parser.add_argument('--score_file', type=str, default='scores.json')
    parser.add_argument('--gt_file', type=str, default='../data/testmini.json', help='ground truth file')
    parser.add_argument('--number', type=int, default=-1, help='number of problems to run')
    parser.add_argument('--rerun', action='store_true', help='rerun the evaluation')
    parser.add_argument('--caculate_gain', action='store_true', help='caculate the socre gains over random guess')
    parser.add_argument('--random_file', type=str, default='score_random_guess.json')  
    args = parser.parse_args()

    # args
    output_file = args.output_file

    # # quick test
    # output_file = '../results/llava-llama-2-13b/output_llava_llama_2_13b.json'

    # read json
    print(f"Reading {output_file}...")
    results = read_json(output_file)

    # read ground truth
    print(f"Reading {args.gt_file}...")
    gts = read_json(args.gt_file)

    # full pids
    full_pids = list(results.keys())
    if args.number > 0:
        full_pids = full_pids[:min(args.number, len(full_pids))]
    print("Number of testing problems:", len(full_pids))
    
    ## [1] Evaluate if the prediction is true or false
    print("\nEvaluating the predictions...")
    update_json_flag = False
    for pid in full_pids:
        problem = results[pid]
        # print(problem)

        if args.rerun:
            if 'prediction' in problem:
                del problem['prediction']
            if 'true_false' in problem:
                del problem['true_false']

        choices = problem['choices']
        question_type = problem['question_type']
        answer_type = problem['answer_type']
        precision = problem['precision']
        extraction = problem['extraction']

        if 'answer' in problem:
            answer = problem['answer']
        else:
            answer = gts[pid]['answer']
            problem['answer'] = answer

        # normalize the extracted answer to match the answer type
        prediction = normalize_extracted_answer(extraction, choices, question_type, answer_type, precision)

        # verify the prediction is true or false
        true_false = safe_equal(prediction, answer)
        
        # update the problem
        if "true_false" not in problem:
            update_json_flag = True

        elif true_false != problem['true_false']:
            update_json_flag = True

        if "prediction" not in problem:
            update_json_flag = True

        elif prediction !=  problem['prediction']:
            update_json_flag = True
            
        problem['prediction'] = prediction
        problem['true_false'] = true_false

    # save the updated json
    if update_json_flag:
        print("\n!!!Some problems are updated.!!!")
        print(f"\nSaving {output_file}...")
        save_json(results, output_file)

    ## [2] Calculate the average accuracy
    total = len(full_pids)
    correct = 0
    for pid in full_pids:
        if results[pid]['true_false']:
            correct += 1
    accuracy = str(round(correct / total * 100, 2))
    print(f"\nCorrect: {correct}, Total: {total}, Accuracy: {accuracy}%")

    scores = {"average": {"accuracy": accuracy, "correct": correct, "total": total}}
    
    ## [3] Calculate the fine-grained accuracy scores
    
    # merge the 'metadata' attribute into the data
    for pid in results:
        results[pid].update(results[pid].pop('metadata'))

    # convert the data to a pandas DataFrame
    df = pd.DataFrame(results).T

    print(len(df))
    print("Number of test problems:", len(df))
    # assert len(df) == 1000 # Important!!!

    # asign the target keys for evaluation
    target_keys = ['question_type', 'answer_type', 'language', 'source', 'category', 'task', 'context', 'grade', 'skills']
     
    for key in target_keys:
        print(f"\nType: [{key}]")
        # get the unique values of the key
        if key == 'skills':
            # the value is a list
            values = []
            for i in range(len(df)):
                values += df[key][i]
            values = list(set(values))
        else:
            values = df[key].unique()
        #print(values)

        # calculate the accuracy for each value
        scores[key] = {}
        for value in values:
            correct, total, acc = get_acc_with_contion(df, key, value)
            if total > 0:
                print(f"[{value}]: {acc}% ({correct}/{total})")
                scores[key][value] = {"accuracy": acc, "correct": correct, "total": total}
        
        # sort the scores by accuracy
        scores[key] = dict(sorted(scores[key].items(), key=lambda item: float(item[1]['accuracy']), reverse=True))

    # save the scores
    scores_file = args.score_file
    print(f"\nSaving {scores_file}...")
    save_json(scores, scores_file)
    print("\nDone!")

    # [4] Calculate the score gains over random guess
    if args.caculate_gain:
        random_file = args.random_file
        random_scores = json.load(open(random_file))

        print("\nCalculating the score gains...")
        for key in scores:
            if key == 'average':
                gain = round(float(scores[key]['accuracy']) - float(random_scores[key]['accuracy']), 2)
                scores[key]['acc_gain'] = gain
            else:
                for sub_key in scores[key]:
                    gain = round(float(scores[key][sub_key]['accuracy']) - float(random_scores[key][sub_key]['accuracy']), 2)
                    scores[key][sub_key]['acc_gain'] = str(gain)

        # save the score gains
        print(f"\nSaving {scores_file}...")    
        save_json(scores, scores_file)
        print("\nDone!")
