import asyncio
import http
import json
from datetime import datetime
from http.client import responses

import requests
import uvicorn
from asgi_correlation_id import CorrelationIdMiddleware
from fastapi import FastAPI, HTTPException
from fastapi import Request
from fastapi.exceptions import RequestValidationError
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.responses import JSONResponse
from fastapi.staticfiles import StaticFiles
from pydantic import ValidationError
from pymongo import __version__ as pymongo_version
from pymongo.errors import PyMongoError

from my_ghost_writer import pymongo_operations_rw
from my_ghost_writer import text_parsers
from my_ghost_writer.constants import (ALLOWED_ORIGIN_LIST, API_MODE, DOMAIN, IS_TESTING, LOG_LEVEL,
   ME_CONFIG_MONGODB_HEALTHCHECK_SLEEP, ME_CONFIG_MONGODB_USE_OK, PORT, RAPIDAPI_HOST, STATIC_FOLDER,
   STATIC_FOLDER_LITEKOBOLDAINET, WORDSAPI_KEY, WORDSAPI_URL, app_logger)
from my_ghost_writer.pymongo_utils import mongodb_health_check
from my_ghost_writer.text_parsers2 import find_synonyms_for_phrase, custom_synonym_handler
from my_ghost_writer.thesaurus import get_current_info_wordnet
from my_ghost_writer.type_hints import (RequestQueryThesaurusInflatedBody, RequestQueryThesaurusWordsapiBody,
    RequestSplitText, RequestTextFrequencyBody, MultiRelatedWordResponse, CustomRelatedWordRequest)


async def mongo_health_check_background_task():
    app_logger.info(f"starting task, ME_CONFIG_MONGODB_USE_OK:{ME_CONFIG_MONGODB_USE_OK}...")
    while ME_CONFIG_MONGODB_USE_OK:
        try:
            db_ok["mongo_ok"] = health_mongo() == "Mongodb: still alive..."
        except (PyMongoError, HTTPException):
            db_ok["mongo_ok"] = False
        await asyncio.sleep(ME_CONFIG_MONGODB_HEALTHCHECK_SLEEP)


async def lifespan(app: FastAPI):
    task = asyncio.create_task(mongo_health_check_background_task())
    yield
    task.cancel()
    try:
        await task
    except asyncio.CancelledError as asyncio_ex:
        app_logger.warning(f"asyncio_ex:'{asyncio_ex}'")


fastapi_title = "My Ghost Writer"
app = FastAPI(title=fastapi_title, version="1.0", lifespan=lifespan)
app_logger.info(f"allowed_origins:{ALLOWED_ORIGIN_LIST}, IS_TESTING:{IS_TESTING}, LOG_LEVEL:{LOG_LEVEL}!")
app.add_middleware(
    CORSMiddleware,
    allow_origins=ALLOWED_ORIGIN_LIST,
    allow_credentials=True,
    allow_methods=["GET", "POST"]
)
db_ok = {"mongo_ok": ME_CONFIG_MONGODB_USE_OK}


@app.middleware("http")
async def request_middleware(request, call_next):
    from my_ghost_writer.middlewares import logging_middleware

    return await logging_middleware(request, call_next)


@app.get("/health")
def health():
    from nltk import __version__ as nltk_version
    from fastapi import __version__ as fastapi_version
    from my_ghost_writer.__version__ import __version__ as ghost_writer_version
    app_logger.info(
        f"still alive... FastAPI version:{fastapi_version}, nltk version:{nltk_version}, my-ghost-writer version:{ghost_writer_version}!")
    return "Still alive..."


@app.get("/health-wordnet")
def get_wordnet_languages():
    try:
        info = get_current_info_wordnet(True)
        return JSONResponse(status_code=200, content={"msg": info})
    except Exception as e:
        app_logger.error("exception:")
        app_logger.error(e)
        raise HTTPException(status_code=503, detail=str(type(e)))


@app.get("/health-mongo")
def health_mongo() -> str:
    app_logger.info(f"pymongo driver version:{pymongo_version}!")
    if ME_CONFIG_MONGODB_USE_OK:
        try:
            db_ok["mongo_ok"] = mongodb_health_check()
            return "Mongodb: still alive..."
        except PyMongoError as pme:
            app_logger.error(f"{type(pme)}, {pme}!")
            db_ok["mongo_ok"] = False
            raise HTTPException(status_code=503, detail=type(pme))
    return f"ME_CONFIG_MONGODB_USE_OK:{ME_CONFIG_MONGODB_USE_OK}..."


@app.post("/words-frequency")
def get_words_frequency(body: RequestTextFrequencyBody | str) -> JSONResponse:
    t0 = datetime.now()
    app_logger.info(f"body type: {type(body)}.")
    app_logger.debug(f"body: {body}.")
    body_validated = RequestTextFrequencyBody.model_validate_json(body)
    text = body_validated.text
    app_logger.info(f"LOG_LEVEL: '{LOG_LEVEL}', length of text: {len(text)}, type of 'text':'{type(text)}'.")
    if len(text) < 100:
        app_logger.debug(f"text from request: {text} ...")
    n_total_rows, words_stems_dict = text_parsers.text_stemming(text)
    dumped = json.dumps(words_stems_dict)
    app_logger.debug(f"dumped: {dumped} ...")
    t1 = datetime.now()
    duration = (t1 - t0).total_seconds()
    content_response = {'words_frequency': dumped, "duration": f"{duration:.3f}", "n_total_rows": n_total_rows}
    app_logger.info(f"content_response: {content_response["duration"]}, {content_response["n_total_rows"]} ...")
    app_logger.debug(f"content_response: {content_response} ...")
    return JSONResponse(status_code=200, content=content_response)


@app.post("/split-text")
def get_sentence_sliced_by_word_and_positions(body: RequestSplitText | str) -> JSONResponse:
    t0 = datetime.now()
    app_logger.info(f"body type: {type(body)}.")
    app_logger.debug(f"body: {body}.")
    try:
        try:
            body_validated = RequestSplitText.model_validate_json(body)
            end = body_validated.end
            start = body_validated.start
            text = body_validated.text
            word = body_validated.word
        except ValidationError:
            assert isinstance(body, RequestSplitText), f"body MUST be of type RequestSplitText, not of '{type(body)}'!"
            end = body.end
            start = body.start
            text = body.text
            word = body.word
        try:
            sentence, start_in_sentence, end_in_sentence = text_parsers.get_sentence_by_word(text, word, start, end)
        except Exception as e0:
            app_logger.error(f"end:'{end}', start:'{start}', word:'{word}'.")
            app_logger.error("text:")
            app_logger.error(text)
            app_logger.error("## error:")
            app_logger.error(e0)
            raise e0
        t1 = datetime.now()
        duration = (t1 - t0).total_seconds()
        content_response = {"duration": f"{duration:.3f}", "end_in_sentence": end_in_sentence, "start_in_sentence": start_in_sentence, "sentence": sentence}
        sentence_len = len(sentence)
        app_logger.info(f"content_response: {content_response["duration"]}, sentence_len: {sentence_len} ...")
        app_logger.debug(f"content_response: {content_response} ...")
        return JSONResponse(status_code=200, content=content_response)
    except Exception as e1:
        app_logger.error(f"URL: query => {type(body)} {body};")
        app_logger.error("exception:")
        app_logger.error(e1)
        raise HTTPException(status_code=500, detail="Internal Server Error")


@app.post("/thesaurus-wordsapi")
def get_thesaurus_wordsapi(body: RequestQueryThesaurusWordsapiBody | str) -> JSONResponse:
    t0 = datetime.now()
    app_logger.info(f"body type: {type(body)} => {body}.")
    body_validated = RequestQueryThesaurusWordsapiBody.model_validate_json(body)
    query = body_validated.query
    use_mongo: bool = db_ok["mongo_ok"]
    app_logger.info(f"query: {type(query)} => {query}, use mongo? {use_mongo}.")
    if use_mongo:
        try:
            response = pymongo_operations_rw.get_document_by_word(query=query)
            t1 = datetime.now()
            duration = (t1 - t0).total_seconds()
            app_logger.info(f"found local data, duration: {duration:.3f}s.")
            return JSONResponse(status_code=200, content={"duration": duration, "thesaurus": response, "source": "local"})
        except (PyMongoError, AssertionError) as pme:
            app_logger.info(f"{pme}! Let's try the remote service...")

    url = f"{WORDSAPI_URL}/{query}"
    app_logger.info(f"url: {type(url)} => {url}.")
    headers = {
        "x-rapidapi-key": WORDSAPI_KEY,
        "x-rapidapi-host": RAPIDAPI_HOST
    }
    response = requests.get(url, headers=headers)
    t1 = datetime.now()
    duration = (t1 - t0).total_seconds()
    app_logger.info(f"response.status_code: {response.status_code}, duration: {duration:.3f}s.")
    msg = f"API response is not 200: '{response.status_code}', query={query}, url={url}, duration: {duration:.3f}s."
    try:
        assert response.status_code < 500, msg
        try:
            assert response.status_code < 400, msg
        except AssertionError:
            msg = response.json()
            app_logger.info(f"msg_404:{msg}.")
            return JSONResponse(status_code=response.status_code, content={"msg": msg})
        response_json = response.json()
        if use_mongo:
            app_logger.debug(f"use_mongo:{use_mongo}, inserting response '{response_json}' by query '{query}' on db...")
            pymongo_operations_rw.insert_document(response_json)
            del response_json["_id"]  # since we inserted the wordsapi response on mongodb now it have a bson _id object not serializable by default
        t2 = datetime.now()
        duration = (t2 - t1).total_seconds()
        app_logger.info(f"response_json: inserted json on local db, duration: {duration:.3f}s. ...")
        return JSONResponse(status_code=200,
                            content={"duration": duration, "thesaurus": response_json, "source": "wordsapi"})
    except AssertionError as ae500:
        app_logger.error(f"URL: query => {type(query)} {query}; url => {type(url)} {url}.")
        app_logger.error(f"headers type: {type(headers)}...")
        # app_logger.error(f"headers: {headers}...")
        app_logger.error("response:")
        app_logger.error(str(response))
        app_logger.error(str(ae500))
        msg = f"request with query '{query}' has response with status '{http.HTTPStatus(response.status_code).phrase}'"
        app_logger.error(f"type_msg:{type(msg)}, msg:{msg}.")
        raise HTTPException(status_code=response.status_code, detail=msg)


@app.post("/thesaurus-inflated-phrase", response_model=MultiRelatedWordResponse)
async def get_synonyms_for_phrase(body: RequestQueryThesaurusInflatedBody):
    """
    Get contextual synonyms for a selected phrase (one or more words).
    It identifies all meaningful words in the selection and returns
    synonym groups for each.
    """
    app_logger.info(f"body tye:{type(body)}!")
    app_logger.debug(f"body:{body}!")
    t0 = datetime.now()
    try:
        body_validated = RequestQueryThesaurusInflatedBody.model_validate_json(body)
        end = body_validated.end
        start = body_validated.start
        text = body_validated.text
        word = body_validated.word
    except ValidationError:
        assert isinstance(body, RequestQueryThesaurusInflatedBody), f"body MUST be of type RequestSplitText, not of '{type(body)}'!"
        end = body.end
        start = body.start
        text = body.text
        word = body.word
    app_logger.info(f"end:{end}!")
    app_logger.info(f"start:{start}!")
    app_logger.info(f"text:{text}!")
    app_logger.info(f"word:{word}!")

    # persistence

    try:
        # The new function in text_parsers2 does all the heavy lifting
        results = find_synonyms_for_phrase(
            text=body.text,
            start_idx=body.start,
            end_idx=body.end
        )
        t1 = datetime.now()
        duration = (t1 - t0).total_seconds()
        app_logger.info(f"got find_synonyms_for_phrase() result in: {duration:.3f}s. ...")
        app_logger.debug(results)

        # persistence

        message = f"Got {len(results)} synonym groups." if results else "No words with synonyms found in the selected phrase."

        t2 = datetime.now()
        duration = (t2 - t1).total_seconds()
        app_logger.info(f"got MultiWordSynonymResponse() result in: {duration:.3f}s. ...")
        # Construct the final response using our Pydantic model
        response_object = MultiRelatedWordResponse(
            success=True,
            original_phrase=body.word,
            original_indices={"start": body.start, "end": body.end},
            results=results,
            message=message,
            duration=duration
        )
        response_json = response_object.model_dump_json(exclude_none=True)
        return JSONResponse(status_code=200, content=json.loads(response_json))

    except HTTPException as http_ex:
        # Re-raise known HTTP exceptions to be handled by FastAPI's handler
        app_logger.error(f"http_ex: '{str(http_ex)}'")
        raise http_ex
    except Exception as e:
        app_logger.error(f"Unexpected error in get_synonyms_for_phrase: '{e}'", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


@app.post("/thesaurus-custom")
async def add_custom_synonyms(body: CustomRelatedWordRequest):
    """Adds custom synonyms for a given word to the in-memory store."""
    try:
        word = body.word
        related_list = body.related
        custom_synonym_handler.add_entry(word, related_list)
        return {"message": f"Custom entry for '{body.word}' added/updated successfully (in-memory)."}

    except Exception as e:
        app_logger.error(f"Error adding custom synonyms: {e}")
        raise HTTPException(status_code=500, detail=f"Failed to add custom synonyms: {str(e)}")


@app.delete("/thesaurus-custom/{word}")
async def delete_custom_synonyms(word: str):
    """Deletes custom synonyms for a given word from the in-memory store."""
    try:
        custom_synonym_handler.delete_entry(word)
        return {"message": f"Synonyms for '{word}' deleted successfully (in-memory)."}
    except KeyError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        app_logger.error(f"Error deleting custom synonyms: {e}")
        raise HTTPException(status_code=500, detail=f"Failed to delete custom synonyms: {str(e)}")


@app.exception_handler(HTTPException)
def http_exception_handler(request: Request, exc: HTTPException) -> JSONResponse:
    origin = request.headers.get("origin")
    allowed_origin = None
    if origin and origin in ALLOWED_ORIGIN_LIST:
        allowed_origin = origin

    response = JSONResponse(
        status_code=exc.status_code,
        content={"detail": responses[exc.status_code]},
        headers={"Vary": "Origin"}
    )
    if allowed_origin:
        response.headers["Access-Control-Allow-Origin"] = allowed_origin
    return response


@app.exception_handler(RequestValidationError)
def request_validation_exception_handler(request: Request, exc: RequestValidationError) -> JSONResponse:
    origin = request.headers.get("origin")
    allowed_origin = None
    if origin and origin in ALLOWED_ORIGIN_LIST:
        allowed_origin = origin

    response = JSONResponse(
        status_code=422,
        content={"detail": responses[422]},
        headers={"Vary": "Origin"}
    )
    if allowed_origin:
        response.headers["Access-Control-Allow-Origin"] = allowed_origin
    return response


try:
    app.mount("/static", StaticFiles(directory=STATIC_FOLDER, html=True), name="static")
except Exception as ex_mount_static:
    app_logger.error(
        f"Failed to mount static folder: {STATIC_FOLDER}, exception: {ex_mount_static}, API_MODE: {API_MODE}!")
    if not API_MODE:
        app_logger.exception(f"since API_MODE is {API_MODE} we will raise the exception!")
        raise ex_mount_static
try:
    app.mount("/lite.koboldai.net", StaticFiles(directory=STATIC_FOLDER_LITEKOBOLDAINET, html=True), name="lite.koboldai.net")
except Exception as ex_mount_static1:
    app_logger.error(
        f"Failed to mount static folder: {STATIC_FOLDER_LITEKOBOLDAINET}, exception: {ex_mount_static1}, API_MODE: {API_MODE}!")
    if not API_MODE:
        app_logger.exception(f"since API_MODE is {API_MODE} we will raise the exception!")
        raise ex_mount_static1

# add the CorrelationIdMiddleware AFTER the @app.middleware("http") decorated function to avoid missing request id
app.add_middleware(CorrelationIdMiddleware)

try:
    @app.get("/")
    @app.get("/static/")
    def index() -> FileResponse:
        return FileResponse(path=STATIC_FOLDER / "index.html", media_type="text/html")
except Exception as ex_route_main:
    app_logger.error(f"Failed to prepare the main route, exception: {ex_route_main}, API_MODE: {API_MODE}!")
    if not API_MODE:
        app_logger.exception(f"since API_MODE is {API_MODE} we will raise the exception!")
        raise ex_route_main


if __name__ == "__main__":
    try:
        info_start = get_current_info_wordnet(True)
        app_logger.info(f"info_start, with NLTK preload:{info_start}.")
        app_logger.info(
            f"Starting fastapi/gradio application {fastapi_title}, run in api mode: {API_MODE} (no static folder and main route)...")
        uvicorn.run("my_ghost_writer.app:app", host=DOMAIN, port=PORT, reload=bool(IS_TESTING))
    except Exception as ex_run:
        print(f"fastapi/gradio application {fastapi_title}, exception:{ex_run}!")
        app_logger.exception(f"fastapi/gradio application {fastapi_title}, exception:{ex_run}!")
        # important env variables: ALLOWED_ORIGIN_LIST, API_MODE, DOMAIN, IS_TESTING, LOG_LEVEL, PORT, STATIC_FOLDER
        app_logger.error(f"ALLOWED_ORIGIN_LIST: '{ALLOWED_ORIGIN_LIST}'")
        app_logger.error(f"API_MODE: '{API_MODE}'")
        app_logger.error(f"DOMAIN: '{DOMAIN}'")
        app_logger.error(f"IS_TESTING: '{IS_TESTING}'")
        app_logger.error(f"LOG_LEVEL: '{LOG_LEVEL}'")
        app_logger.error(f"PORT: '{PORT}'")
        app_logger.error(f"STATIC_FOLDER: '{STATIC_FOLDER}'")
        raise ex_run