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import gradio as gr
import os

from langchain.document_loaders import PyPDFLoader
from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain.vectorstores import Chroma
from langchain.chains import ConversationalRetrievalChain
from langchain.embeddings import HuggingFaceEmbeddings 
from langchain.llms import HuggingFacePipeline
from langchain.chains import ConversationChain
from langchain.memory import ConversationBufferMemory
from langchain.llms import HuggingFaceHub
from langchain.memory import ConversationBufferWindowMemory
from langchain_community.document_loaders import TextLoader
from langchain_community.document_loaders import DirectoryLoader
from langchain_community.document_loaders import UnstructuredHTMLLoader

from pathlib import Path
import chromadb

from transformers import AutoTokenizer
import transformers
import torch
import tqdm 
import accelerate

from transformers import MBartForConditionalGeneration, MBart50TokenizerFast
translation_model = MBartForConditionalGeneration.from_pretrained("facebook/mbart-large-50-many-to-many-mmt")
translation_tokenizer = MBart50TokenizerFast.from_pretrained("facebook/mbart-large-50-many-to-many-mmt")

languages_list = [("Gujarati", "gu_IN"), ('Hindi',"hi_IN") , ("Bengali","bn_IN"), ("Malayalam","ml_IN"), 
                  ("Marathi","mr_IN"), ("Tamil","ta_IN"), ("Telugu","te_IN")]


lang_global = ''
def intitalize_lang(language):
    global lang_global
    lang_global = language
    print("intitalize_lang"+lang_global)

def english_to_indian(sentence):
    #print ("english_to_indian"+lang_global)
    translated_sentence  = ''
    translation_tokenizer.src_lang = "en_xx"
    chunks = [sentence[i:i+500] for i in range(0, len(sentence), 500)]
    for chunk in chunks:
        encoded_hi = translation_tokenizer(chunk, return_tensors="pt")
        generated_tokens = translation_model.generate(**encoded_hi, 
                                                      forced_bos_token_id=translation_tokenizer.lang_code_to_id[lang_global] )
        x = translation_tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
        translated_sentence = translated_sentence + x[0]
    print(translated_sentence)
    return translated_sentence

def indian_to_english(sentence):
    translated_sentence  = ''
    translation_tokenizer.src_lang = lang_global
    chunks = [sentence[i:i+500] for i in range(0, len(sentence), 500)]
    for chunk in chunks:
        encoded_hi = translation_tokenizer(chunk, return_tensors="pt")
        generated_tokens = translation_model.generate(**encoded_hi, forced_bos_token_id=translation_tokenizer.lang_code_to_id["en_XX"] )
        x = translation_tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
        translated_sentence = translated_sentence + x[0]
    print(translated_sentence)
    return translated_sentence


#llm_model = "mistralai/Mixtral-8x7B-Instruct-v0.1"
#llm_model = "mistralai/Mistral-7B-Instruct-v0.2"
llm_model = "google/gemma-7b"
tokenizer_name = "thenlper/gte-small"

# default_persist_directory = './chroma_HF/'
list_llm = ["mistralai/Mistral-7B-Instruct-v0.2", "mistralai/Mixtral-8x7B-Instruct-v0.1", "mistralai/Mistral-7B-Instruct-v0.1", \
    "google/gemma-7b-it","google/gemma-2b-it", \
    "HuggingFaceH4/zephyr-7b-beta", "meta-llama/Llama-2-7b-chat-hf", "microsoft/phi-2", \
    "TinyLlama/TinyLlama-1.1B-Chat-v1.0", "mosaicml/mpt-7b-instruct", "tiiuae/falcon-7b-instruct", \
    "google/flan-t5-xxl"
]
list_llm_simple = [os.path.basename(llm) for llm in list_llm]

# Load PDF document and create doc splits
def load_doc(list_file_path, chunk_size, chunk_overlap):
    # Processing for one document only
    # loader = PyPDFLoader(file_path)
    # pages = loader.load()
    loaders = [UnstructuredHTMLLoader(x) for x in list_file_path]
    pages = []
    for loader in loaders:
        pages.extend(loader.load())
    # text_splitter = RecursiveCharacterTextSplitter(chunk_size = 600, chunk_overlap = 50)
    text_splitter = RecursiveCharacterTextSplitter.from_huggingface_tokenizer(
        AutoTokenizer.from_pretrained(tokenizer_name),
        chunk_size=chunk_size,
        chunk_overlap=chunk_overlap,
        strip_whitespace=True)
    doc_splits = text_splitter.split_documents(pages)
    return doc_splits
    


# Create vector database
def create_db(splits, collection_name):
    embedding = HuggingFaceEmbeddings()
    new_client = chromadb.EphemeralClient()
    vectordb = Chroma.from_documents(
        documents=splits,
        embedding=embedding,
        client=new_client,
        collection_name=collection_name,
        # persist_directory=default_persist_directory
    )
    return vectordb


# Load vector database
def load_db():
    embedding = HuggingFaceEmbeddings()
    vectordb = Chroma(
        # persist_directory=default_persist_directory, 
        embedding_function=embedding)
    return vectordb


# Initialize langchain LLM chain
def initialize_llmchain(temperature, max_tokens, top_k, vector_db, progress=gr.Progress()):
    progress(0.1, desc="Initializing HF tokenizer...")
    
    # HuggingFaceHub uses HF inference endpoints
    progress(0.5, desc="Initializing HF Hub...")

    llm = HuggingFaceHub(repo_id=llm_model, model_kwargs={"temperature": temperature, 
                                                          "max_new_tokens": max_tokens, 
                                                          "top_k": top_k, 
                                                          "load_in_8bit": True})
    
    progress(0.75, desc="Defining buffer memory...")
    #memory = ConversationBufferMemory(memory_key="chat_history",output_key='answer',return_messages=True)
    memory = ConversationBufferWindowMemory(memory_key = 'chat_history', k=3,output_key='answer',return_messages=True)
    retriever=vector_db.as_retriever()
    progress(0.8, desc="Defining retrieval chain...")
    qa_chain = ConversationalRetrievalChain.from_llm(llm,retriever=retriever,chain_type="stuff", 
                                                     memory=memory,return_source_documents=True,verbose=False)
    progress(0.9, desc="Done!")
    return qa_chain


# Initialize database
def initialize_database(list_file_obj, chunk_size, chunk_overlap, progress=gr.Progress()):
    # Create list of documents (when valid)
    list_file_path = [x.name for x in list_file_obj if x is not None]
    # Create collection_name for vector database
    progress(0.1, desc="Creating collection name...")
    collection_name = Path(list_file_path[0]).stem
    # Fix potential issues from naming convention
    ## Remove space
    collection_name = collection_name.replace(" ","-")
    # Remove periods
    collection_name = collection_name.replace(".","_") 
    octets = collection_name.split('.')
    if len(octets) != 4 or any(not 0 <= int(octet) <= 255 for octet in octets):
        print('ipv4 address')  # Not a valid IPv4 address
    ## Limit lenght to 50 characters
    collection_name = collection_name[:50]
    ## Enforce start and end as alphanumeric character
    if not collection_name[0].isalnum():
        collection_name[0] = 'A'
    if not collection_name[-1].isalnum():
        collection_name[-1] = 'Z'
    # print('list_file_path: ', list_file_path)
    print('Collection name: ', collection_name)
    progress(0.25, desc="Loading document...")
    # Load document and create splits
    doc_splits = load_doc(list_file_path, chunk_size, chunk_overlap)
    # Create or load vector database
    progress(0.5, desc="Generating vector database...")
    # global vector_db
    vector_db = create_db(doc_splits, collection_name)
    progress(0.9, desc="Done!")
    return vector_db, collection_name, "Complete!"


def initialize_LLM(llm_temperature, max_tokens, top_k, vector_db, progress=gr.Progress()):
    # print("llm_option",llm_option)
    llm_name = llm_model
    print("llm_name: ",llm_name)
    qa_chain = initialize_llmchain(llm_temperature, max_tokens, top_k, vector_db, progress)
    return qa_chain, "Complete!"


def format_chat_history(message, chat_history):
    formatted_chat_history = []
    for user_message, bot_message in chat_history:
        formatted_chat_history.append(f"User: {user_message}")
        formatted_chat_history.append(f"Assistant: {bot_message}")
    return formatted_chat_history
    

def conversation(qa_chain, message, history):
    formatted_chat_history = format_chat_history(message, history)
    #print("formatted_chat_history",formatted_chat_history)
   
    # Generate response using QA chain
    response = qa_chain({"question": message, "chat_history": formatted_chat_history})
    response_answer = response["answer"]
    if response_answer.find("Helpful Answer:") != -1:
        response_answer = response_answer.split("Helpful Answer:")[-1]
    response_sources = response["source_documents"]
    response_source1 = response_sources[0].page_content.strip()
    response_source2 = response_sources[1].page_content.strip()
    response_source3 = response_sources[2].page_content.strip()
    # Langchain sources are zero-based
    #response_source1_page = response_sources[0].metadata["page"] + 1
    #response_source2_page = response_sources[1].metadata["page"] + 1
    #response_source3_page = response_sources[2].metadata["page"] + 1
    response_source1_page = 0
    response_source2_page = 0
    response_source3_page = 0
    # print ('chat response: ', response_answer)
    # print('DB source', response_sources)
    
    # Append user message and response to chat history
    new_history = history + [(message, response_answer)]
    # return gr.update(value=""), new_history, response_sources[0], response_sources[1] 
    return qa_chain, gr.update(value=""), new_history, response_source1, response_source1_page, response_source2, response_source2_page, response_source3, response_source3_page
    

def upload_file(file_obj):
    list_file_path = []
    for idx, file in enumerate(file_obj):
        file_path = file_obj.name
        list_file_path.append(file_path)
    # print(file_path)
    # initialize_database(file_path, progress)
    return list_file_path

def demo():
    with gr.Blocks(theme=gr.themes.Soft()) as demo:
        vector_db = gr.State()
        qa_chain = gr.State()
        collection_name = gr.State()
        pdf_directory = '/home/user/app/htmls/'

        def process_pdfs():
            # List all PDF files in the directory
            #pdf_files = [os.path.join(pdf_directory, file) for file in os.listdir(pdf_directory) if file.endswith(".html")]
            pdf_files = [os.path.join(pdf_directory, file) for file in os.listdir(pdf_directory)]
            print('pdf files: ',len(pdf_files))
            return pdf_files
            
        # Create a dictionary with the necessary information
        pdf_dict = {"value": process_pdfs, "height": 100, "file_count": "multiple", 
                    "visible": False, "file_types": ["html"], "interactive": True, 
                    "label": "Uploaded PDF documents"}
        
        # Create a gr.Files component with the dictionary
        #document_files = gr.Files(**pdf_dict)

        with gr.Row():
            # document = gr.Files(value = process_pdfs, height=100, file_count="multiple",visible=True,
            #                     file_types=["pdf"], interactive=True, label="Upload your PDF documents (single or multiple)")
            document = gr.Files(**pdf_dict)
        with gr.Row():
            db_btn = gr.Radio(["ChromaDB"], label="Vector database type", value = "ChromaDB", type="index", info="Choose your vector database",visible=False)
        with gr.Accordion("Advanced options - Document text splitter", open=False, visible=False):
            with gr.Row():
                slider_chunk_size = gr.Slider(value=2000, label="Chunk size", info="Chunk size", interactive=False, visible=False)
            with gr.Row():
                slider_chunk_overlap = gr.Slider(value=256, label="Chunk overlap", info="Chunk overlap", interactive=False, visible=False)

        with gr.Accordion("Advanced options - LLM model", open=False, visible=False):
            with gr.Row():
                slider_temperature = gr.Slider(value = 0.1,visible=False)
            with gr.Row():
                slider_maxtokens = gr.Slider(value = 4000, visible=False)
            with gr.Row():
                slider_topk = gr.Slider(value = 3, visible=False)

        with gr.Row():
            lang_btn = gr.Dropdown(languages_list, label="Languages", value = languages_list[1],
                                type="value", info="Choose your language",interactive = True)
            lang_btn.change(intitalize_lang, inputs = lang_btn)

            
        with gr.Row():
            db_progress = gr.Textbox(label="Vector database initialization", value="None", visible=True)
            llm_progress = gr.Textbox(value="None",label="QA chain initialization", visible=True)
        with gr.Row():
            db_btn = gr.Button("Generate vector database")
            qachain_btn = gr.Button("Initialize model")
            # with gr.Row():
                
            # with gr.Row():
                


        
        chatbot = gr.Chatbot(height=300, bubble_full_width = False, layout = 'panel')
        chatbot.change(preprocess = english_to_indian, postprocess =  indian_to_english)
        
        with gr.Row():
            msg = gr.Textbox(placeholder="Type message", container=True)  

        
        with gr.Accordion("References", open=False):
            with gr.Row():
                doc_source1 = gr.Textbox(label="Reference 1", lines=2, container=True, scale=20)
                source1_page = gr.Number(label="Page", scale=1)
            with gr.Row():
                doc_source2 = gr.Textbox(label="Reference 2", lines=2, container=True, scale=20)
                source2_page = gr.Number(label="Page", scale=1)
            with gr.Row():
                doc_source3 = gr.Textbox(label="Reference 3", lines=2, container=True, scale=20)
                source3_page = gr.Number(label="Page", scale=1)
        
        with gr.Row():
            submit_btn = gr.Button("Submit")
            clear_btn = gr.ClearButton([msg, chatbot])
            
        # Preprocessing events
        #upload_btn.upload(upload_file, inputs=[upload_btn], outputs=[document])
        db_btn.click(initialize_database, \
            inputs=[document, slider_chunk_size, slider_chunk_overlap], \
            outputs=[vector_db, collection_name, db_progress])
        qachain_btn.click(initialize_LLM, \
            inputs=[slider_temperature, slider_maxtokens, slider_topk, vector_db], \
            outputs=[qa_chain, llm_progress]).then(lambda:[None,"",0,"",0,"",0], \
            inputs=None, \
            outputs=[chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
                    ], \
            queue=False)

        # Chatbot events
        msg.submit(conversation, \
            inputs=[qa_chain, msg, chatbot], \
            outputs=[qa_chain, msg, chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
                    ], \
            queue=False)
        submit_btn.click(conversation, \
            inputs=[qa_chain, msg, chatbot], \
            outputs=[qa_chain, msg, chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
                    ], \
            queue=False)
        clear_btn.click(lambda:[None,"",0,"",0,"",0], \
            inputs=None, \
            outputs=[chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
                    ], \
            queue=False)
    demo.queue().launch(debug=True)


if __name__ == "__main__":
    demo()

	import gradio as gr
	import os

	from langchain.document_loaders import PyPDFLoader
	from langchain.text_splitter import RecursiveCharacterTextSplitter
	from langchain.vectorstores import Chroma
	from langchain.chains import ConversationalRetrievalChain
	from langchain.embeddings import HuggingFaceEmbeddings
	from langchain.llms import HuggingFacePipeline
	from langchain.chains import ConversationChain
	from langchain.memory import ConversationBufferMemory
	from langchain.llms import HuggingFaceHub
	from langchain.memory import ConversationBufferWindowMemory
	from langchain_community.document_loaders import TextLoader
	from langchain_community.document_loaders import DirectoryLoader
	from langchain_community.document_loaders import UnstructuredHTMLLoader

	from pathlib import Path
	import chromadb

	from transformers import AutoTokenizer
	import transformers
	import torch
	import tqdm
	import accelerate

	from transformers import MBartForConditionalGeneration, MBart50TokenizerFast
	translation_model = MBartForConditionalGeneration.from_pretrained("facebook/mbart-large-50-many-to-many-mmt")
	translation_tokenizer = MBart50TokenizerFast.from_pretrained("facebook/mbart-large-50-many-to-many-mmt")

	languages_list = [("Gujarati", "gu_IN"), ('Hindi',"hi_IN") , ("Bengali","bn_IN"), ("Malayalam","ml_IN"),
	("Marathi","mr_IN"), ("Tamil","ta_IN"), ("Telugu","te_IN")]


	lang_global = ''
	def intitalize_lang(language):
	global lang_global
	lang_global = language
	print("intitalize_lang"+lang_global)

	def english_to_indian(sentence):
	#print ("english_to_indian"+lang_global)
	translated_sentence = ''
	translation_tokenizer.src_lang = "en_xx"
	chunks = [sentence[i:i+500] for i in range(0, len(sentence), 500)]
	for chunk in chunks:
	encoded_hi = translation_tokenizer(chunk, return_tensors="pt")
	generated_tokens = translation_model.generate(**encoded_hi,
	forced_bos_token_id=translation_tokenizer.lang_code_to_id[lang_global] )
	x = translation_tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
	translated_sentence = translated_sentence + x[0]
	print(translated_sentence)
	return translated_sentence

	def indian_to_english(sentence):
	translated_sentence = ''
	translation_tokenizer.src_lang = lang_global
	chunks = [sentence[i:i+500] for i in range(0, len(sentence), 500)]
	for chunk in chunks:
	encoded_hi = translation_tokenizer(chunk, return_tensors="pt")
	generated_tokens = translation_model.generate(**encoded_hi, forced_bos_token_id=translation_tokenizer.lang_code_to_id["en_XX"] )
	x = translation_tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
	translated_sentence = translated_sentence + x[0]
	print(translated_sentence)
	return translated_sentence


	#llm_model = "mistralai/Mixtral-8x7B-Instruct-v0.1"
	#llm_model = "mistralai/Mistral-7B-Instruct-v0.2"
	llm_model = "google/gemma-7b"
	tokenizer_name = "thenlper/gte-small"

	# default_persist_directory = './chroma_HF/'
	list_llm = ["mistralai/Mistral-7B-Instruct-v0.2", "mistralai/Mixtral-8x7B-Instruct-v0.1", "mistralai/Mistral-7B-Instruct-v0.1", \
	"google/gemma-7b-it","google/gemma-2b-it", \
	"HuggingFaceH4/zephyr-7b-beta", "meta-llama/Llama-2-7b-chat-hf", "microsoft/phi-2", \
	"TinyLlama/TinyLlama-1.1B-Chat-v1.0", "mosaicml/mpt-7b-instruct", "tiiuae/falcon-7b-instruct", \
	"google/flan-t5-xxl"
	]
	list_llm_simple = [os.path.basename(llm) for llm in list_llm]

	# Load PDF document and create doc splits
	def load_doc(list_file_path, chunk_size, chunk_overlap):
	# Processing for one document only
	# loader = PyPDFLoader(file_path)
	# pages = loader.load()
	loaders = [UnstructuredHTMLLoader(x) for x in list_file_path]
	pages = []
	for loader in loaders:
	pages.extend(loader.load())
	# text_splitter = RecursiveCharacterTextSplitter(chunk_size = 600, chunk_overlap = 50)
	text_splitter = RecursiveCharacterTextSplitter.from_huggingface_tokenizer(
	AutoTokenizer.from_pretrained(tokenizer_name),
	chunk_size=chunk_size,
	chunk_overlap=chunk_overlap,
	strip_whitespace=True)
	doc_splits = text_splitter.split_documents(pages)
	return doc_splits



	# Create vector database
	def create_db(splits, collection_name):
	embedding = HuggingFaceEmbeddings()
	new_client = chromadb.EphemeralClient()
	vectordb = Chroma.from_documents(
	documents=splits,
	embedding=embedding,
	client=new_client,
	collection_name=collection_name,
	# persist_directory=default_persist_directory
	)
	return vectordb


	# Load vector database
	def load_db():
	embedding = HuggingFaceEmbeddings()
	vectordb = Chroma(
	# persist_directory=default_persist_directory,
	embedding_function=embedding)
	return vectordb


	# Initialize langchain LLM chain
	def initialize_llmchain(temperature, max_tokens, top_k, vector_db, progress=gr.Progress()):
	progress(0.1, desc="Initializing HF tokenizer...")

	# HuggingFaceHub uses HF inference endpoints
	progress(0.5, desc="Initializing HF Hub...")

	llm = HuggingFaceHub(repo_id=llm_model, model_kwargs={"temperature": temperature,
	"max_new_tokens": max_tokens,
	"top_k": top_k,
	"load_in_8bit": True})

	progress(0.75, desc="Defining buffer memory...")
	#memory = ConversationBufferMemory(memory_key="chat_history",output_key='answer',return_messages=True)
	memory = ConversationBufferWindowMemory(memory_key = 'chat_history', k=3,output_key='answer',return_messages=True)
	retriever=vector_db.as_retriever()
	progress(0.8, desc="Defining retrieval chain...")
	qa_chain = ConversationalRetrievalChain.from_llm(llm,retriever=retriever,chain_type="stuff",
	memory=memory,return_source_documents=True,verbose=False)
	progress(0.9, desc="Done!")
	return qa_chain


	# Initialize database
	def initialize_database(list_file_obj, chunk_size, chunk_overlap, progress=gr.Progress()):
	# Create list of documents (when valid)
	list_file_path = [x.name for x in list_file_obj if x is not None]
	# Create collection_name for vector database
	progress(0.1, desc="Creating collection name...")
	collection_name = Path(list_file_path[0]).stem
	# Fix potential issues from naming convention
	## Remove space
	collection_name = collection_name.replace(" ","-")
	# Remove periods
	collection_name = collection_name.replace(".","_")
	octets = collection_name.split('.')
	if len(octets) != 4 or any(not 0 <= int(octet) <= 255 for octet in octets):
	print('ipv4 address') # Not a valid IPv4 address
	## Limit lenght to 50 characters
	collection_name = collection_name[:50]
	## Enforce start and end as alphanumeric character
	if not collection_name[0].isalnum():
	collection_name[0] = 'A'
	if not collection_name[-1].isalnum():
	collection_name[-1] = 'Z'
	# print('list_file_path: ', list_file_path)
	print('Collection name: ', collection_name)
	progress(0.25, desc="Loading document...")
	# Load document and create splits
	doc_splits = load_doc(list_file_path, chunk_size, chunk_overlap)
	# Create or load vector database
	progress(0.5, desc="Generating vector database...")
	# global vector_db
	vector_db = create_db(doc_splits, collection_name)
	progress(0.9, desc="Done!")
	return vector_db, collection_name, "Complete!"


	def initialize_LLM(llm_temperature, max_tokens, top_k, vector_db, progress=gr.Progress()):
	# print("llm_option",llm_option)
	llm_name = llm_model
	print("llm_name: ",llm_name)
	qa_chain = initialize_llmchain(llm_temperature, max_tokens, top_k, vector_db, progress)
	return qa_chain, "Complete!"


	def format_chat_history(message, chat_history):
	formatted_chat_history = []
	for user_message, bot_message in chat_history:
	formatted_chat_history.append(f"User: {user_message}")
	formatted_chat_history.append(f"Assistant: {bot_message}")
	return formatted_chat_history


	def conversation(qa_chain, message, history):
	formatted_chat_history = format_chat_history(message, history)
	#print("formatted_chat_history",formatted_chat_history)

	# Generate response using QA chain
	response = qa_chain({"question": message, "chat_history": formatted_chat_history})
	response_answer = response["answer"]
	if response_answer.find("Helpful Answer:") != -1:
	response_answer = response_answer.split("Helpful Answer:")[-1]
	response_sources = response["source_documents"]
	response_source1 = response_sources[0].page_content.strip()
	response_source2 = response_sources[1].page_content.strip()
	response_source3 = response_sources[2].page_content.strip()
	# Langchain sources are zero-based
	#response_source1_page = response_sources[0].metadata["page"] + 1
	#response_source2_page = response_sources[1].metadata["page"] + 1
	#response_source3_page = response_sources[2].metadata["page"] + 1
	response_source1_page = 0
	response_source2_page = 0
	response_source3_page = 0
	# print ('chat response: ', response_answer)
	# print('DB source', response_sources)

	# Append user message and response to chat history
	new_history = history + [(message, response_answer)]
	# return gr.update(value=""), new_history, response_sources[0], response_sources[1]
	return qa_chain, gr.update(value=""), new_history, response_source1, response_source1_page, response_source2, response_source2_page, response_source3, response_source3_page


	def upload_file(file_obj):
	list_file_path = []
	for idx, file in enumerate(file_obj):
	file_path = file_obj.name
	list_file_path.append(file_path)
	# print(file_path)
	# initialize_database(file_path, progress)
	return list_file_path

	def demo():
	with gr.Blocks(theme=gr.themes.Soft()) as demo:
	vector_db = gr.State()
	qa_chain = gr.State()
	collection_name = gr.State()
	pdf_directory = '/home/user/app/htmls/'

	def process_pdfs():
	# List all PDF files in the directory
	#pdf_files = [os.path.join(pdf_directory, file) for file in os.listdir(pdf_directory) if file.endswith(".html")]
	pdf_files = [os.path.join(pdf_directory, file) for file in os.listdir(pdf_directory)]
	print('pdf files: ',len(pdf_files))
	return pdf_files

	# Create a dictionary with the necessary information
	pdf_dict = {"value": process_pdfs, "height": 100, "file_count": "multiple",
	"visible": False, "file_types": ["html"], "interactive": True,
	"label": "Uploaded PDF documents"}

	# Create a gr.Files component with the dictionary
	#document_files = gr.Files(**pdf_dict)

	with gr.Row():
	# document = gr.Files(value = process_pdfs, height=100, file_count="multiple",visible=True,
	# file_types=["pdf"], interactive=True, label="Upload your PDF documents (single or multiple)")
	document = gr.Files(**pdf_dict)
	with gr.Row():
	db_btn = gr.Radio(["ChromaDB"], label="Vector database type", value = "ChromaDB", type="index", info="Choose your vector database",visible=False)
	with gr.Accordion("Advanced options - Document text splitter", open=False, visible=False):
	with gr.Row():
	slider_chunk_size = gr.Slider(value=2000, label="Chunk size", info="Chunk size", interactive=False, visible=False)
	with gr.Row():
	slider_chunk_overlap = gr.Slider(value=256, label="Chunk overlap", info="Chunk overlap", interactive=False, visible=False)

	with gr.Accordion("Advanced options - LLM model", open=False, visible=False):
	with gr.Row():
	slider_temperature = gr.Slider(value = 0.1,visible=False)
	with gr.Row():
	slider_maxtokens = gr.Slider(value = 4000, visible=False)
	with gr.Row():
	slider_topk = gr.Slider(value = 3, visible=False)

	with gr.Row():
	lang_btn = gr.Dropdown(languages_list, label="Languages", value = languages_list[1],
	type="value", info="Choose your language",interactive = True)
	lang_btn.change(intitalize_lang, inputs = lang_btn)


	with gr.Row():
	db_progress = gr.Textbox(label="Vector database initialization", value="None", visible=True)
	llm_progress = gr.Textbox(value="None",label="QA chain initialization", visible=True)
	with gr.Row():
	db_btn = gr.Button("Generate vector database")
	qachain_btn = gr.Button("Initialize model")
	# with gr.Row():

	# with gr.Row():




	chatbot = gr.Chatbot(height=300, bubble_full_width = False, layout = 'panel')
	chatbot.change(preprocess = english_to_indian, postprocess = indian_to_english)

	with gr.Row():
	msg = gr.Textbox(placeholder="Type message", container=True)


	with gr.Accordion("References", open=False):
	with gr.Row():
	doc_source1 = gr.Textbox(label="Reference 1", lines=2, container=True, scale=20)
	source1_page = gr.Number(label="Page", scale=1)
	with gr.Row():
	doc_source2 = gr.Textbox(label="Reference 2", lines=2, container=True, scale=20)
	source2_page = gr.Number(label="Page", scale=1)
	with gr.Row():
	doc_source3 = gr.Textbox(label="Reference 3", lines=2, container=True, scale=20)
	source3_page = gr.Number(label="Page", scale=1)

	with gr.Row():
	submit_btn = gr.Button("Submit")
	clear_btn = gr.ClearButton([msg, chatbot])

	# Preprocessing events
	#upload_btn.upload(upload_file, inputs=[upload_btn], outputs=[document])
	db_btn.click(initialize_database, \
	inputs=[document, slider_chunk_size, slider_chunk_overlap], \
	outputs=[vector_db, collection_name, db_progress])
	qachain_btn.click(initialize_LLM, \
	inputs=[slider_temperature, slider_maxtokens, slider_topk, vector_db], \
	outputs=[qa_chain, llm_progress]).then(lambda:[None,"",0,"",0,"",0], \
	inputs=None, \
	outputs=[chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
	], \
	queue=False)

	# Chatbot events
	msg.submit(conversation, \
	inputs=[qa_chain, msg, chatbot], \
	outputs=[qa_chain, msg, chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
	], \
	queue=False)
	submit_btn.click(conversation, \
	inputs=[qa_chain, msg, chatbot], \
	outputs=[qa_chain, msg, chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
	], \
	queue=False)
	clear_btn.click(lambda:[None,"",0,"",0,"",0], \
	inputs=None, \
	outputs=[chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page
	], \
	queue=False)
	demo.queue().launch(debug=True)


	if __name__ == "__main__":
	demo()