import asyncio
import datetime
import http.client
import json
import os
import traceback

import openai
import dotenv
import requests
from celery import Celery
from celery.result import AsyncResult
from flask import Flask, request, render_template, send_from_directory, jsonify, Response
from langchain import FAISS
from langchain import VectorDBQA, HuggingFaceHub, Cohere, OpenAI
from langchain.chains import LLMChain, ConversationalRetrievalChain
from langchain.chains.conversational_retrieval.prompts import CONDENSE_QUESTION_PROMPT
from langchain.chains.question_answering import load_qa_chain
from langchain.chat_models import ChatOpenAI
from langchain.embeddings import OpenAIEmbeddings, HuggingFaceHubEmbeddings, CohereEmbeddings, \
    HuggingFaceInstructEmbeddings
from langchain.prompts import PromptTemplate
from langchain.prompts.chat import (
    ChatPromptTemplate,
    SystemMessagePromptTemplate,
    HumanMessagePromptTemplate,
)
from pymongo import MongoClient
from werkzeug.utils import secure_filename

from core.settings import settings
from error import bad_request
from worker import ingest_worker

# os.environ["LANGCHAIN_HANDLER"] = "langchain"

if settings.LLM_NAME == "manifest":
    from manifest import Manifest
    from langchain.llms.manifest import ManifestWrapper

    manifest = Manifest(
        client_name="huggingface",
        client_connection="http://127.0.0.1:5000"
    )

# Redirect PosixPath to WindowsPath on Windows
import platform

if platform.system() == "Windows":
    import pathlib

    temp = pathlib.PosixPath
    pathlib.PosixPath = pathlib.WindowsPath

# loading the .env file
dotenv.load_dotenv()

# load the prompts
with open("prompts/combine_prompt.txt", "r") as f:
    template = f.read()

with open("prompts/combine_prompt_hist.txt", "r") as f:
    template_hist = f.read()

with open("prompts/question_prompt.txt", "r") as f:
    template_quest = f.read()

with open("prompts/chat_combine_prompt.txt", "r") as f:
    chat_combine_template = f.read()

with open("prompts/chat_reduce_prompt.txt", "r") as f:
    chat_reduce_template = f.read()

if settings.API_KEY is not None:
    api_key_set = True
else:
    api_key_set = False
if settings.EMBEDDINGS_KEY is not None:
    embeddings_key_set = True
else:
    embeddings_key_set = False

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER = "inputs"
app.config['CELERY_BROKER_URL'] = settings.CELERY_BROKER_URL
app.config['CELERY_RESULT_BACKEND'] = settings.CELERY_RESULT_BACKEND
app.config['MONGO_URI'] = settings.MONGO_URI
celery = Celery()
celery.config_from_object('celeryconfig')
mongo = MongoClient(app.config['MONGO_URI'])
db = mongo["docsgpt"]
vectors_collection = db["vectors"]


async def async_generate(chain, question, chat_history):
    result = await chain.arun({"question": question, "chat_history": chat_history})
    return result


def run_async_chain(chain, question, chat_history):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    result = {}
    try:
        answer = loop.run_until_complete(async_generate(chain, question, chat_history))
    finally:
        loop.close()
    result["answer"] = answer
    return result


@celery.task(bind=True)
def ingest(self, directory, formats, name_job, filename, user):
    resp = ingest_worker(self, directory, formats, name_job, filename, user)
    return resp


@app.route("/")
def home():
    return render_template("index.html", api_key_set=api_key_set, llm_choice=settings.LLM_NAME,
                           embeddings_choice=settings.EMBEDDINGS_NAME)

def complete_stream(question):
    import sys
    openai.api_key = settings.API_KEY
    docsearch = FAISS.load_local("", OpenAIEmbeddings(openai_api_key=settings.EMBEDDINGS_KEY))
    docs = docsearch.similarity_search(question, k=2)
    # join all page_content together with a newline
    docs_together = "\n".join([doc.page_content for doc in docs])

    # swap {summaries} in chat_combine_template with the summaries from the docs
    p_chat_combine = chat_combine_template.replace("{summaries}", docs_together)
    completion = openai.ChatCompletion.create(model="gpt-3.5-turbo", messages=[
        {"role": "system", "content": p_chat_combine},
        {"role": "user", "content": question},
    ], stream=True, max_tokens=1000, temperature=0)

    for line in completion:
        print(line, file=sys.stderr)
        if 'content' in line['choices'][0]['delta']:
            # check if the delta contains content
            data = json.dumps({"answer": str(line['choices'][0]['delta']['content'])})
            yield f"data: {data}\n\n"
    # send data.type = "end" to indicate that the stream has ended as json
    data = json.dumps({"type": "end"})
    yield f"data: {data}\n\n"
@app.route("/stream", methods=['POST', 'GET'])
def stream():
    #data = request.get_json()
    #question = data["question"]
    # get parameter from url question
    question = request.args.get('question')
    #question = "Hi"
    return Response(complete_stream(question), mimetype='text/event-stream')


@app.route("/api/answer", methods=["POST"])
def api_answer():
    data = request.get_json()
    question = data["question"]
    history = data["history"]
    print('-' * 5)
    if not api_key_set:
        api_key = data["api_key"]
    else:
        api_key = settings.API_KEY
    if not embeddings_key_set:
        embeddings_key = data["embeddings_key"]
    else:
        embeddings_key = settings.EMBEDDINGS_KEY

    # use try and except  to check for exception
    try:
        # check if the vectorstore is set
        if "active_docs" in data:
            if data["active_docs"].split("/")[0] == "local":
                if data["active_docs"].split("/")[1] == "default":
                    vectorstore = ""
                else:
                    vectorstore = "indexes/" + data["active_docs"]
            else:
                vectorstore = "vectors/" + data["active_docs"]
            if data['active_docs'] == "default":
                vectorstore = ""
        else:
            vectorstore = ""
        print(vectorstore)
        # vectorstore = "outputs/inputs/"
        # loading the index and the store and the prompt template
        # Note if you have used other embeddings than OpenAI, you need to change the embeddings
        if settings.EMBEDDINGS_NAME == "openai_text-embedding-ada-002":
            docsearch = FAISS.load_local(vectorstore, OpenAIEmbeddings(openai_api_key=embeddings_key))
        elif settings.EMBEDDINGS_NAME == "huggingface_sentence-transformers/all-mpnet-base-v2":
            docsearch = FAISS.load_local(vectorstore, HuggingFaceHubEmbeddings())
        elif settings.EMBEDDINGS_NAME == "huggingface_hkunlp/instructor-large":
            docsearch = FAISS.load_local(vectorstore, HuggingFaceInstructEmbeddings())
        elif settings.EMBEDDINGS_NAME == "cohere_medium":
            docsearch = FAISS.load_local(vectorstore, CohereEmbeddings(cohere_api_key=embeddings_key))

        # create a prompt template
        if history:
            history = json.loads(history)
            template_temp = template_hist.replace("{historyquestion}", history[0]).replace("{historyanswer}",
                                                                                           history[1])
            c_prompt = PromptTemplate(input_variables=["summaries", "question"], template=template_temp,
                                      template_format="jinja2")
        else:
            c_prompt = PromptTemplate(input_variables=["summaries", "question"], template=template,
                                      template_format="jinja2")

        q_prompt = PromptTemplate(input_variables=["context", "question"], template=template_quest,
                                  template_format="jinja2")
        if settings.LLM_NAME == "openai_chat":
            llm = ChatOpenAI(openai_api_key=api_key)  # optional parameter: model_name="gpt-4"
            messages_combine = [
                SystemMessagePromptTemplate.from_template(chat_combine_template),
                HumanMessagePromptTemplate.from_template("{question}")
            ]
            p_chat_combine = ChatPromptTemplate.from_messages(messages_combine)
        elif settings.LLM_NAME == "openai":
            llm = OpenAI(openai_api_key=api_key, temperature=0)
        elif settings.LLM_NAME == "manifest":
            llm = ManifestWrapper(client=manifest, llm_kwargs={"temperature": 0.001, "max_tokens": 2048})
        elif settings.LLM_NAME == "huggingface":
            llm = HuggingFaceHub(repo_id="bigscience/bloom", huggingfacehub_api_token=api_key)
        elif settings.LLM_NAME == "cohere":
            llm = Cohere(model="command-xlarge-nightly", cohere_api_key=api_key)
        else:
            raise ValueError("unknown LLM model")

        if settings.LLM_NAME == "openai_chat":
            question_generator = LLMChain(llm=llm, prompt=CONDENSE_QUESTION_PROMPT)
            doc_chain = load_qa_chain(llm, chain_type="map_reduce", combine_prompt=p_chat_combine)
            chain = ConversationalRetrievalChain(
                retriever=docsearch.as_retriever(k=2),
                question_generator=question_generator,
                combine_docs_chain=doc_chain,
            )
            chat_history = []
            # result = chain({"question": question, "chat_history": chat_history})
            # generate async with async generate method
            result = run_async_chain(chain, question, chat_history)
        else:
            qa_chain = load_qa_chain(llm=llm, chain_type="map_reduce",
                                     combine_prompt=c_prompt, question_prompt=q_prompt)
            chain = VectorDBQA(combine_documents_chain=qa_chain, vectorstore=docsearch, k=3)
            result = chain({"query": question})

        print(result)

        # some formatting for the frontend
        if "result" in result:
            result['answer'] = result['result']
        result['answer'] = result['answer'].replace("\\n", "\n")
        try:
            result['answer'] = result['answer'].split("SOURCES:")[0]
        except Exception:
            pass

        # mock result
        # result = {
        #     "answer": "The answer is 42",
        #     "sources": ["https://en.wikipedia.org/wiki/42_(number)", "https://en.wikipedia.org/wiki/42_(number)"]
        # }
        return result
    except Exception as e:
        # print whole traceback
        traceback.print_exc()
        print(str(e))
        return bad_request(500, str(e))


@app.route("/api/docs_check", methods=["POST"])
def check_docs():
    # check if docs exist in a vectorstore folder
    data = request.get_json()
    # split docs on / and take first part
    if data["docs"].split("/")[0] == "local":
        return {"status": 'exists'}
    vectorstore = "vectors/" + data["docs"]
    base_path = 'https://raw.githubusercontent.com/arc53/DocsHUB/main/'
    if os.path.exists(vectorstore) or data["docs"] == "default":
        return {"status": 'exists'}
    else:
        r = requests.get(base_path + vectorstore + "index.faiss")

        if r.status_code != 200:
            return {"status": 'null'}
        else:
            if not os.path.exists(vectorstore):
                os.makedirs(vectorstore)
            with open(vectorstore + "index.faiss", "wb") as f:
                f.write(r.content)

            # download the store
            r = requests.get(base_path + vectorstore + "index.pkl")
            with open(vectorstore + "index.pkl", "wb") as f:
                f.write(r.content)

        return {"status": 'loaded'}


@app.route("/api/feedback", methods=["POST"])
def api_feedback():
    data = request.get_json()
    question = data["question"]
    answer = data["answer"]
    feedback = data["feedback"]

    print('-' * 5)
    print("Question: " + question)
    print("Answer: " + answer)
    print("Feedback: " + feedback)
    print('-' * 5)
    response = requests.post(
        url="https://86x89umx77.execute-api.eu-west-2.amazonaws.com/docsgpt-feedback",
        headers={
            "Content-Type": "application/json; charset=utf-8",
        },
        data=json.dumps({
            "answer": answer,
            "question": question,
            "feedback": feedback
        })
    )
    return {"status": http.client.responses.get(response.status_code, 'ok')}


@app.route('/api/combine', methods=['GET'])
def combined_json():
    user = 'local'
    """Provide json file with combined available indexes."""
    # get json from https://d3dg1063dc54p9.cloudfront.net/combined.json

    data = [{
        "name": 'default',
        "language": 'default',
        "version": '',
        "description": 'default',
        "fullName": 'default',
        "date": 'default',
        "docLink": 'default',
        "model": settings.EMBEDDINGS_NAME,
        "location": "local"
    }]
    # structure: name, language, version, description, fullName, date, docLink
    # append data from vectors_collection
    for index in vectors_collection.find({'user': user}):
        data.append({
            "name": index['name'],
            "language": index['language'],
            "version": '',
            "description": index['name'],
            "fullName": index['name'],
            "date": index['date'],
            "docLink": index['location'],
            "model": settings.EMBEDDINGS_NAME,
            "location": "local"
        })

    data_remote = requests.get("https://d3dg1063dc54p9.cloudfront.net/combined.json").json()
    for index in data_remote:
        index['location'] = "remote"
        data.append(index)

    return jsonify(data)


@app.route('/api/upload', methods=['POST'])
def upload_file():
    """Upload a file to get vectorized and indexed."""
    if 'user' not in request.form:
        return {"status": 'no user'}
    user = secure_filename(request.form['user'])
    if 'name' not in request.form:
        return {"status": 'no name'}
    job_name = secure_filename(request.form['name'])
    # check if the post request has the file part
    if 'file' not in request.files:
        print('No file part')
        return {"status": 'no file'}
    file = request.files['file']
    if file.filename == '':
        return {"status": 'no file name'}

    if file:
        filename = secure_filename(file.filename)
        # save dir
        save_dir = os.path.join(app.config['UPLOAD_FOLDER'], user, job_name)
        # create dir if not exists
        if not os.path.exists(save_dir):
            os.makedirs(save_dir)

        file.save(os.path.join(save_dir, filename))
        task = ingest.delay('temp', [".rst", ".md", ".pdf", ".txt"], job_name, filename, user)
        # task id
        task_id = task.id
        return {"status": 'ok', "task_id": task_id}
    else:
        return {"status": 'error'}


@app.route('/api/task_status', methods=['GET'])
def task_status():
    """Get celery job status."""
    task_id = request.args.get('task_id')
    task = AsyncResult(task_id)
    task_meta = task.info
    return {"status": task.status, "result": task_meta}


### Backgound task api
@app.route('/api/upload_index', methods=['POST'])
def upload_index_files():
    """Upload two files(index.faiss, index.pkl) to the user's folder."""
    if 'user' not in request.form:
        return {"status": 'no user'}
    user = secure_filename(request.form['user'])
    if 'name' not in request.form:
        return {"status": 'no name'}
    job_name = secure_filename(request.form['name'])
    if 'file_faiss' not in request.files:
        print('No file part')
        return {"status": 'no file'}
    file_faiss = request.files['file_faiss']
    if file_faiss.filename == '':
        return {"status": 'no file name'}
    if 'file_pkl' not in request.files:
        print('No file part')
        return {"status": 'no file'}
    file_pkl = request.files['file_pkl']
    if file_pkl.filename == '':
        return {"status": 'no file name'}

    # saves index files
    save_dir = os.path.join('indexes', user, job_name)
    if not os.path.exists(save_dir):
        os.makedirs(save_dir)
    file_faiss.save(os.path.join(save_dir, 'index.faiss'))
    file_pkl.save(os.path.join(save_dir, 'index.pkl'))
    # create entry in vectors_collection
    vectors_collection.insert_one({
        "user": user,
        "name": job_name,
        "language": job_name,
        "location": save_dir,
        "date": datetime.datetime.now().strftime("%d/%m/%Y %H:%M:%S"),
        "model": settings.EMBEDDINGS_NAME,
        "type": "local"
    })
    return {"status": 'ok'}


@app.route('/api/download', methods=['get'])
def download_file():
    user = secure_filename(request.args.get('user'))
    job_name = secure_filename(request.args.get('name'))
    filename = secure_filename(request.args.get('file'))
    save_dir = os.path.join(app.config['UPLOAD_FOLDER'], user, job_name)
    return send_from_directory(save_dir, filename, as_attachment=True)


@app.route('/api/delete_old', methods=['get'])
def delete_old():
    """Delete old indexes."""
    import shutil
    path = request.args.get('path')
    dirs = path.split('/')
    dirs_clean = []
    for i in range(1, len(dirs)):
        dirs_clean.append(secure_filename(dirs[i]))
    # check that path strats with indexes or vectors
    if dirs[0] not in ['indexes', 'vectors']:
        return {"status": 'error'}
    path_clean = '/'.join(dirs)
    vectors_collection.delete_one({'location': path})
    try:
        shutil.rmtree(path_clean)
    except FileNotFoundError:
        pass
    return {"status": 'ok'}


# handling CORS
@app.after_request
def after_request(response):
    response.headers.add('Access-Control-Allow-Origin', '*')
    response.headers.add('Access-Control-Allow-Headers', 'Content-Type,Authorization')
    response.headers.add('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS')
    response.headers.add('Access-Control-Allow-Credentials', 'true')
    return response


if __name__ == "__main__":
    app.run(debug=True, port=5001)