from langchain.docstore.document import Document
from langchain.chains.question_answering import load_qa_chain
import chromadb
from datetime import datetime
import os
from datetime import datetime
import pdfkit
from langchain.chains.question_answering import load_qa_chain
from langchain.prompts import PromptTemplate
from pathlib import Path
import os
from pypdf import PdfReader

from llm_call import SermonGeminiPromptTemplate
bookQuestion = dict()
llm = None
embed_model = None

contemplandoQuestion = {
    'DEVOCIONALMENTE':'¿Cómo estimula Dios su corazón a través de Su Palabra?',
    'EXÉGESIS':'Cuál es el contexto de este pasaje?',
    'CRISTO':'¿Cómo se comprende este texto a la luz de Cristo?',
    'ARCO REDENTOR':'¿Cómo encaja este texto en la metanarrativa de las Escrituras?',
    'EVANGELION': '¿Cómo se declara el evangelio en este texto?',
    'EVANGELION_TWO': '¿Cómo interpretamos este texto a la luz del evangelio?',
     }

proclamandoQuestion = {
     'PÚBLICO':'¿Cuáles son los ídolos en los corazones de las personas que rechazarían el evangelio de Cristo?',
     'HISTORIA':'¿Cómo el guión de su predicación comunica la historia de Dios?',
     'EXPECTATIVAS': '¿Qué espera Dios que hagan como respuesta a esta predicación?',
     'EXPECTATIVAS_TWO': '¿Cuáles son sus expectativas divinas como predicador de este mensaje?',
 }


bookQuestion['Contemplando'] = contemplandoQuestion
bookQuestion['Proclamando'] = proclamandoQuestion

HISTORY_ANSWER = ""

DIRECTORY_PATH_TO_DOWNLOAD = 'data/sermon_lab_ai/download_files'

if not os.path.exists(DIRECTORY_PATH_TO_DOWNLOAD):
  os.makedirs(f"{DIRECTORY_PATH_TO_DOWNLOAD}")

def getCurrentFileName():
  now = datetime.now()
  strNow = now.strftime("%m%d%Y_%H%M%S")
  return f"sermonDay_{strNow}.pdf"

fileAddresToDownload = f"{DIRECTORY_PATH_TO_DOWNLOAD}{os.sep}{getCurrentFileName()}"
FILE_PATH_NAME = fileAddresToDownload

def updatePromptTemplate(promptTemplate, inputVariablesTemplate):
    prompt = PromptTemplate(template = promptTemplate,
                        input_variables = inputVariablesTemplate)
    chain = load_qa_chain(
        llm,
        chain_type = "stuff",
        prompt = prompt
    )

    return chain
def predict(query):
  templates = SermonGeminiPromptTemplate()

  chain = updatePromptTemplate(
      templates.getSermonPromptTemplate('BUILD_PREPARE_QUESTIONS'),
       ['question','SERMON_CONTEXT','context']
    )

  if query != '':
    global retriever
    answer = askQuestion(
        query,
        chain,
        retriever,
        topic = query,
        KEY = 'question'
    )
    answer = (answer.split("<|assistant|>")[-1]).strip()
    HISTORY_ANSWER = answer

    return answer
  else:
    return query

def predictContemplando(queryKey):
  #Call to LLM LangChaing inference
  query = contemplandoQuestion[queryKey]
  return predict(query)


def predictProclamando(queryKey):
  #Call to LLM LangChaing inference
  query = proclamandoQuestion[queryKey]
  return predict(query)

####
#
####
def predictFromInit(sermonTopic):
  global HISTORY_ANSWER
  keyStr = 'SERMON_TOPIC'

  templates = SermonGeminiPromptTemplate()

  if HISTORY_ANSWER == '':
    chain = updatePromptTemplate(
        templates.getSermonPromptTemplates('BUILD_INIT'),
        [keyStr,'CANT_VERSICULOS','context']
        )
  else:
    chain = updatePromptTemplate(
        templates.getSermonPromptTemplates('BUILD_EMPTY'),
        ['BIBLE_VERSICLE','context']
        )
    keyStr = 'BIBLE_VERSICLE'

  global retriever
  answer = askQuestionInit(
      '',
      chain,
      retriever,
      topic = sermonTopic,
      KEY = keyStr
    )

  #Create a new document and build a retriver
  if answer != '':
    doc =  Document(page_content="text", metadata = {"source": "local"})

    vectorstore = Chroma.from_documents(
      documents = [doc],
      embedding = embed_model,
      persist_directory="chroma_db_dir_sermon",  # Local mode with in-memory storage only
      collection_name="sermon_lab_ai"
    )

    retriever = vectorstore.as_retriever(
        search_kwargs = {"k": 3}
    )


  HISTORY_ANSWER = answer

  return answer

####
#
####
def predictQuestionBuild(sermonTopic):
  templates = SermonGeminiPromptTemplate()
  chain = updatePromptTemplate(
      templates.getSermonPromptTemplates('BUILD_QUESTION'),
       ['SERMON_IDEA', 'context']
      )
  global retriever
  answer = askQuestionEx(
      '',
      chain,
      retriever,
      topic = sermonTopic,
      KEY = 'SERMON_IDEA'
    )

  return answer

####
#
####
def predictDevotionBuild(sermonTopic):
  templates = SermonGeminiPromptTemplate()
  chain = updatePromptTemplate(
      templates.getSermonPromptTemplate('BUILD_REFLECTIONS'),
       ['SERMON_IDEA', 'context']
      )
  global retriever
  global HISTORY_ANSWER
  answer = askQuestionEx(
      HISTORY_ANSWER,
      chain,
      retriever,
      topic = sermonTopic,
      KEY = 'SERMON_IDEA'
    )

  return answer


# A utility function for answer generation
def askQuestion(
        question,
        _chain,
        _retriever,
        topic = 'el amor de Dios',
        KEY = 'SERMON_TOPIC'
    ):

   #Obtener los Chunks relevantes a la pregunta en el RAG
   #print(f" Question: {question}")

   context = _retriever.get_relevant_documents(question)

   #print("----  Contexto ----")
   #print(context)
   #print("____________________GLOBAL________")

   global HISTORY_ANSWER

   #print (HISTORY_ANSWER)

   return (
         _chain({
             KEY: topic,
             'SERMON_CONTEXT': HISTORY_ANSWER,
             "input_documents": context,
             "question": question
             },
            return_only_outputs = True)
         )['output_text']


 #A utility function for answer generation
def askQuestionEx(
        question,
        _chain,
        _retriever,
        topic = 'el amor de Dios',
        KEY = 'SERMON_TOPIC'
    ):

   context = _retriever.get_relevant_documents(question)

   global HISTORY_ANSWER

   return (
         _chain({
             KEY: topic,
             "input_documents": context,
             "question": question
             },
            return_only_outputs=True)
         )['output_text']

# A utility function for answer generation
def askQuestionInit(
        question,
        _chain,
        _retriever,
        topic = 'el amor de Dios',
        KEY = 'SERMON_TOPIC'
    ):

   #Obtener los Chunks relevantes a la pregunta en el RAG
   context = _retriever.get_relevant_documents(question)

   settings = {
             KEY: topic,
             "input_documents": context,
             "question": question
             }

   if KEY == 'SERMON_TOPIC':
     settings['CANT_VERSICULOS'] = 5

   return (
         _chain(
            settings,
            return_only_outputs=True)
         )['output_text']


def downloadSermonFile(answer):

  if os.path.exists(FILE_PATH_NAME):
    os.remove(FILE_PATH_NAME)

  pdfkit.from_string(
        answer,
       FILE_PATH_NAME
    )

  return ""


def upload_file_ex(files):
    file_paths = [file.name for file in files]

    for filepath in file_paths:
      name = Path(filepath)
      file_content = 'Empty content'

      if os.path.exists(filepath):
        file_content = ''
        reader = PdfReader(filepath)

        for page in reader.pages:
          file_content += page.extract_text()

        HISTORY_ANSWER = file_content
    return [file_paths, file_content]