from prompt import Prompt
from openai import OpenAI
from fuzzywuzzy import fuzz
from fuzzywuzzy import process

import gradio as gr
import pandas as pd
import os

class Backend:
    def __init__(self):
        self.agent = OpenAI()
        self.prompt = Prompt()

    def read_file_single(self, file):
        # read the file
        if file is not None:
            with open(file.name, 'r') as f:
                text = f.read()
        else:
            raise gr.Error("You need to upload a file first")
        return text
    
    def phrase_pdf(self, file_path):
        from langchain.document_loaders import UnstructuredPDFLoader
        loader = UnstructuredPDFLoader(file_path, model = 'elements')
        file = loader.load()
        return file[0].page_content

    def read_file(self, files):
        # read the file
        text_list = []
        self.filename_list = []
        if files is not None:
            for file in files:
                if file.name.split('.')[-1] == 'pdf':
                    # convert pdf to txt
                    text = self.phrase_pdf(file.name)
                    
                else:
                    with open(file.name, 'r', encoding='utf-8') as f:
                        text = f.read()

                text_list.append(text)
                self.filename_list.append(file.name.split('\\')[-1])
        else:
            raise gr.Error("You need to upload a file first")
        return text_list
    
    def highlight_text(self, text, highlight_list):
        # Find the original sentences
        # Split the passage into sentences
        sentences_in_passage = text.split('.')
        sentences_in_passage = [i.split('\n') for i in sentences_in_passage]
        new_sentences_in_passage = []
        for i in sentences_in_passage:
            new_sentences_in_passage =new_sentences_in_passage + i

        # hightlight the reference
        for hl in highlight_list:
            # Find the best match using fuzzy matching
            best_match = process.extractOne(hl, new_sentences_in_passage, scorer=fuzz.partial_ratio)
            text = text.replace(best_match[0], f'<mark style="background: #A5D2F1">{best_match[0]}</mark><mark style="background: #FFC0CB"><font color="red"> (match score:{best_match[1]})</font></mark>')

        # add line break
        text = text.replace('\n', f" <br /> ")

        # add scroll bar
        text = f'<div style="height: 300px; overflow: auto;">{text}</div>'

        return text
    
    def process_file(self, file, questions, openai_key, progress = gr.Progress()):
        # record the questions
        self.questions = questions

        # get the text_list
        self.text_list = self.read_file(file)

        # make the prompt
        prompt_list = [self.prompt.get(text, questions, 'v3') for text in self.text_list]

        # interact with openai
        self.res_list = []
        for prompt in progress.tqdm(prompt_list, desc = 'Generating answers...'):
            res = self.agent(prompt, with_history = False, temperature = 0.1, model = 'gpt-3.5-turbo-16k', api_key = openai_key)
            res = self.prompt.process_result(res, 'v3')
            self.res_list.append(res)

        # Use the first file as default
        # Use the first question for multiple questions
        gpt_res = self.res_list[0]
        self.gpt_result = gpt_res

        self.current_question = 0
        self.totel_question = len(res.keys())
        self.current_passage = 0
        self.total_passages = len(self.res_list)

        # make a dataframe to record everything
        self.ori_answer_df = pd.DataFrame()
        self.answer_df = pd.DataFrame()
        for i, res in enumerate(self.res_list):
            tmp = pd.DataFrame(res).T
            tmp = tmp.reset_index()
            tmp = tmp.rename(columns={"index":"question_id"})
            tmp['filename'] = self.filename_list[i]
            tmp['question'] = self.questions
            self.ori_answer_df = pd.concat([tmp, self.ori_answer_df])
            self.answer_df = pd.concat([tmp, self.answer_df])

        # default fist question
        res = res['Question 1']
        question = self.questions[self.current_question]
        self.answer = res['answer']
        self.text = self.text_list[0]
        self.highlighted_out = res['original sentences']
        highlighted_out_html = self.highlight_text(self.text, self.highlighted_out)
        self.highlighted_out = '\n'.join(self.highlighted_out)

        file_name = self.filename_list[self.current_passage]
        
        return file_name, question, self.answer, highlighted_out_html, self.answer, self.highlighted_out
    
    def process_results(self, answer_correct, correct_answer, reference_correct, correct_reference):
        if not hasattr(self, 'clicked_correct_answer'):
            raise gr.Error("You need to judge whether the generated answer is correct first")

        if not hasattr(self, 'clicked_correct_reference'):
            raise gr.Error("You need to judge whether the highlighted reference is correct first")

        if not hasattr(self, 'answer_df'):
            raise gr.Error("You need to submit the document first")
        
        if self.current_question >= self.totel_question or self.current_question < 0:
            raise gr.Error("No more questions, please return back")
                
        # record the answer
        condition = (self.answer_df['question_id'] == f'Question {self.current_question + 1}' ) & \
            (self.answer_df['filename'] == self.filename_list[self.current_passage]) 
        self.answer_df.loc[condition, 'answer_correct'] = answer_correct
        self.answer_df.loc[condition, 'reference_correct'] = reference_correct

        # self.answer_df.loc[f'Question {self.current_question + 1}', 'answer_correct'] = answer_correct
        # self.answer_df.loc[f'Question {self.current_question + 1}', 'reference_correct'] = reference_correct
        
        if self.clicked_correct_answer == True:
            if hasattr(self, 'answer'):
                self.answer_df.loc[condition, 'correct_answer'] = self.answer
            else:
                raise gr.Error("You need to submit the document first")
        else:
            # self.answer_df.loc[f'Question {self.current_question + 1}', 'correct_answer'] = correct_answer
            self.answer_df.loc[condition, 'correct_answer'] = correct_answer
        
        if self.clicked_correct_reference == True:
            if hasattr(self, 'highlighted_out'):
                self.answer_df.loc[condition, 'correct_reference'] = self.highlighted_out
            else:
                raise gr.Error("You need to submit the document first")
        else:
            self.answer_df.loc[condition, 'correct_reference'] = correct_reference
        
        gr.Info('Results saved!')
        return "Results saved!"
    
    def process_next(self):
        self.current_question += 1
        if hasattr(self, 'clicked_correct_answer'):
            del self.clicked_correct_answer
        if hasattr(self, 'clicked_correct_reference'):
            del self.clicked_correct_reference

        if self.current_question >= self.totel_question:
            # self.current_question -= 1
            return "No more questions!", "No more questions!", "No more questions!", "No more questions!", 'No more questions!', 'No more questions!', 'Still need to click the button above to save the results', None, None
        else:
            res = self.gpt_result[f'Question {self.current_question + 1}']
            question = self.questions[self.current_question]
            self.answer = res['answer']
            self.highlighted_out = res['original sentences']
            highlighted_out_html = self.highlight_text(self.text, self.highlighted_out)
            self.highlighted_out = '\n'.join(self.highlighted_out)
            file_name = self.filename_list[self.current_passage]

            return file_name, question, self.answer, highlighted_out_html, 'Please judge on the generated answer', 'Please judge on the generated answer', 'Still need to click the button above to save the results', None, None

    def process_last(self):
        self.current_question -= 1

        # To make sure to correct the answer first
        if hasattr(self, 'clicked_correct_answer'):
            del self.clicked_correct_answer
        if hasattr(self, 'clicked_correct_reference'):
            del self.clicked_correct_reference
        
        # check question boundary
        if self.current_question < 0:
            # self.current_question += 1
            return "No more questions!", "No more questions!", "No more questions!", "No more questions!", 'No more questions!', 'No more questions!', 'Still need to click the button above to save the results', None, None
        else:
            res = self.gpt_result[f'Question {self.current_question + 1}']
            question = self.questions[self.current_question]
            self.answer = res['answer']
            self.highlighted_out = res['original sentences']
            highlighted_out_html = self.highlight_text(self.text, self.highlighted_out)
            self.highlighted_out = '\n'.join(self.highlighted_out)
            file_name = self.filename_list[self.current_passage]
            return file_name, question, self.answer, highlighted_out_html, 'Please judge on the generated answer', 'Please judge on the generated answer', 'Still need to click the button above to save the results', None, None

    def switch_next_passage(self):
        self.current_question = 0

        # To make sure to correct the answer first
        if hasattr(self, 'clicked_correct_answer'):
            del self.clicked_correct_answer
        if hasattr(self, 'clicked_correct_reference'):
            del self.clicked_correct_reference

        self.current_passage += 1
        

        if self.current_passage >= self.total_passages:
            # self.current_passage -= 1
            return "No more passages!", "No more passages!", "No more passages!", "No more passages!", 'No more passages!', 'No more passages!', 'Still need to click the button above to save the results', None, None
        else:
            self.text = self.text_list[self.current_passage]
            gpt_res = self.res_list[self.current_passage]
            self.gpt_result = gpt_res
            res = self.gpt_result[f'Question {self.current_question + 1}']
            question = self.questions[self.current_question]
            self.answer = res['answer']
            self.highlighted_out = res['original sentences']
            highlighted_out_html = self.highlight_text(self.text, self.highlighted_out)
            self.highlighted_out = '\n'.join(self.highlighted_out)
            file_name = self.filename_list[self.current_passage]
            return file_name, question, self.answer, highlighted_out_html, 'Please judge on the generated answer', 'Please judge on the generated answer', 'Still need to click the button above to save the results', None, None

    def switch_last_passage(self):
        self.current_question = 0

        # To make sure to correct the answer first
        if hasattr(self, 'clicked_correct_answer'):
            del self.clicked_correct_answer
        if hasattr(self, 'clicked_correct_reference'):
            del self.clicked_correct_reference

        self.current_passage -= 1

        if self.current_passage < 0:
            # self.current_passage += 1
            return "No more passages!", "No more passages!", "No more passages!", "No more passages!", 'No more passages!', 'No more passages!', 'Still need to click the button above to save the results', None, None
        else:
            self.text = self.text_list[self.current_passage]
            gpt_res = self.res_list[self.current_passage]
            self.gpt_result = gpt_res
            res = self.gpt_result[f'Question {self.current_question + 1}']
            question = self.questions[self.current_question]
            self.answer = res['answer']
            self.highlighted_out = res['original sentences']
            highlighted_out_html = self.highlight_text(self.text, self.highlighted_out)
            self.highlighted_out = '\n'.join(self.highlighted_out)
            file_name = self.filename_list[self.current_passage]
            return file_name, question, self.answer, highlighted_out_html, 'Please judge on the generated answer', 'Please judge on the generated answer', 'Still need to click the button above to save the results', None, None

    def download_answer(self, path = './tmp', name = 'answer.xlsx'):
        os.makedirs(path, exist_ok = True)
        path = os.path.join(path, name)
        # self.ori_answer_df['questions'] = self.questions
        self.ori_answer_df.to_excel(path, index = False)

        return path
    
    def download_corrected(self, path = './tmp', name = 'corrected_answer.xlsx'):
        os.makedirs(path, exist_ok = True)
        path = os.path.join(path, name)
        # self.answer_df['questions'] = self.questions
        self.answer_df.to_excel(path, index = False)

        return path
    
    def change_correct_answer(self, correctness):
        if correctness == "Correct":
            self.clicked_correct_answer = True
            return "No need to change"
        else:
            if hasattr(self, 'answer'):
                self.clicked_correct_answer = False
                return self.answer
            else:
                return "No answer yet, you need to submit the document first"   
        
    def change_correct_reference(self, correctness):
        if correctness == "Correct":
            self.clicked_correct_reference = True
            return "No need to change"
        else:
            if hasattr(self, 'highlighted_out'):
                self.clicked_correct_reference = False
                return self.highlighted_out
            else:
                return "No answer yet, you need to submit the document first"