from fastapi import FastAPI, Request, Response, HTTPException, Depends
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import StreamingResponse, JSONResponse, FileResponse

import requests
import aiohttp
import asyncio
import json
import logging

from pydantic import BaseModel
from starlette.background import BackgroundTask

from apps.webui.models.models import Models
from apps.webui.models.users import Users
from constants import ERROR_MESSAGES
from utils.utils import (
    decode_token,
    get_current_user,
    get_verified_user,
    get_admin_user,
)
from utils.task import prompt_template

from config import (
    SRC_LOG_LEVELS,
    ENABLE_OPENAI_API,
    OPENAI_API_BASE_URLS,
    OPENAI_API_KEYS,
    CACHE_DIR,
    ENABLE_MODEL_FILTER,
    MODEL_FILTER_LIST,
    AppConfig,
)
from typing import List, Optional


import hashlib
from pathlib import Path

log = logging.getLogger(__name__)
log.setLevel(SRC_LOG_LEVELS["OPENAI"])

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


app.state.config = AppConfig()

app.state.config.ENABLE_MODEL_FILTER = ENABLE_MODEL_FILTER
app.state.config.MODEL_FILTER_LIST = MODEL_FILTER_LIST

app.state.config.ENABLE_OPENAI_API = ENABLE_OPENAI_API
app.state.config.OPENAI_API_BASE_URLS = OPENAI_API_BASE_URLS
app.state.config.OPENAI_API_KEYS = OPENAI_API_KEYS

app.state.MODELS = {}


@app.middleware("http")
async def check_url(request: Request, call_next):
    if len(app.state.MODELS) == 0:
        await get_all_models()
    else:
        pass

    response = await call_next(request)
    return response


@app.get("/config")
async def get_config(user=Depends(get_admin_user)):
    return {"ENABLE_OPENAI_API": app.state.config.ENABLE_OPENAI_API}


class OpenAIConfigForm(BaseModel):
    enable_openai_api: Optional[bool] = None


@app.post("/config/update")
async def update_config(form_data: OpenAIConfigForm, user=Depends(get_admin_user)):
    app.state.config.ENABLE_OPENAI_API = form_data.enable_openai_api
    return {"ENABLE_OPENAI_API": app.state.config.ENABLE_OPENAI_API}


class UrlsUpdateForm(BaseModel):
    urls: List[str]


class KeysUpdateForm(BaseModel):
    keys: List[str]


@app.get("/urls")
async def get_openai_urls(user=Depends(get_admin_user)):
    return {"OPENAI_API_BASE_URLS": app.state.config.OPENAI_API_BASE_URLS}


@app.post("/urls/update")
async def update_openai_urls(form_data: UrlsUpdateForm, user=Depends(get_admin_user)):
    await get_all_models()
    app.state.config.OPENAI_API_BASE_URLS = form_data.urls
    return {"OPENAI_API_BASE_URLS": app.state.config.OPENAI_API_BASE_URLS}


@app.get("/keys")
async def get_openai_keys(user=Depends(get_admin_user)):
    return {"OPENAI_API_KEYS": app.state.config.OPENAI_API_KEYS}


@app.post("/keys/update")
async def update_openai_key(form_data: KeysUpdateForm, user=Depends(get_admin_user)):
    app.state.config.OPENAI_API_KEYS = form_data.keys
    return {"OPENAI_API_KEYS": app.state.config.OPENAI_API_KEYS}


@app.post("/audio/speech")
async def speech(request: Request, user=Depends(get_verified_user)):
    idx = None
    try:
        idx = app.state.config.OPENAI_API_BASE_URLS.index("https://api.openai.com/v1")
        body = await request.body()
        name = hashlib.sha256(body).hexdigest()

        SPEECH_CACHE_DIR = Path(CACHE_DIR).joinpath("./audio/speech/")
        SPEECH_CACHE_DIR.mkdir(parents=True, exist_ok=True)
        file_path = SPEECH_CACHE_DIR.joinpath(f"{name}.mp3")
        file_body_path = SPEECH_CACHE_DIR.joinpath(f"{name}.json")

        # Check if the file already exists in the cache
        if file_path.is_file():
            return FileResponse(file_path)

        headers = {}
        headers["Authorization"] = f"Bearer {app.state.config.OPENAI_API_KEYS[idx]}"
        headers["Content-Type"] = "application/json"
        if "openrouter.ai" in app.state.config.OPENAI_API_BASE_URLS[idx]:
            headers["HTTP-Referer"] = "https://openwebui.com/"
            headers["X-Title"] = "Open WebUI"
        r = None
        try:
            r = requests.post(
                url=f"{app.state.config.OPENAI_API_BASE_URLS[idx]}/audio/speech",
                data=body,
                headers=headers,
                stream=True,
            )

            r.raise_for_status()

            # Save the streaming content to a file
            with open(file_path, "wb") as f:
                for chunk in r.iter_content(chunk_size=8192):
                    f.write(chunk)

            with open(file_body_path, "w") as f:
                json.dump(json.loads(body.decode("utf-8")), f)

            # Return the saved file
            return FileResponse(file_path)

        except Exception as e:
            log.exception(e)
            error_detail = "Open WebUI: Server Connection Error"
            if r is not None:
                try:
                    res = r.json()
                    if "error" in res:
                        error_detail = f"External: {res['error']}"
                except:
                    error_detail = f"External: {e}"

            raise HTTPException(
                status_code=r.status_code if r else 500, detail=error_detail
            )

    except ValueError:
        raise HTTPException(status_code=401, detail=ERROR_MESSAGES.OPENAI_NOT_FOUND)


async def fetch_url(url, key):
    timeout = aiohttp.ClientTimeout(total=5)
    try:
        headers = {"Authorization": f"Bearer {key}"}
        async with aiohttp.ClientSession(timeout=timeout, trust_env=True) as session:
            async with session.get(url, headers=headers) as response:
                return await response.json()
    except Exception as e:
        # Handle connection error here
        log.error(f"Connection error: {e}")
        return None


async def cleanup_response(
    response: Optional[aiohttp.ClientResponse],
    session: Optional[aiohttp.ClientSession],
):
    if response:
        response.close()
    if session:
        await session.close()


def merge_models_lists(model_lists):
    log.debug(f"merge_models_lists {model_lists}")
    merged_list = []

    for idx, models in enumerate(model_lists):
        if models is not None and "error" not in models:
            merged_list.extend(
                [
                    {
                        **model,
                        "name": model.get("name", model["id"]),
                        "owned_by": "openai",
                        "openai": model,
                        "urlIdx": idx,
                    }
                    for model in models
                    if "api.openai.com"
                    not in app.state.config.OPENAI_API_BASE_URLS[idx]
                    or "gpt" in model["id"]
                ]
            )

    return merged_list


async def get_all_models(raw: bool = False):
    log.info("get_all_models()")

    if (
        len(app.state.config.OPENAI_API_KEYS) == 1
        and app.state.config.OPENAI_API_KEYS[0] == ""
    ) or not app.state.config.ENABLE_OPENAI_API:
        models = {"data": []}
    else:
        # Check if API KEYS length is same than API URLS length
        if len(app.state.config.OPENAI_API_KEYS) != len(
            app.state.config.OPENAI_API_BASE_URLS
        ):
            # if there are more keys than urls, remove the extra keys
            if len(app.state.config.OPENAI_API_KEYS) > len(
                app.state.config.OPENAI_API_BASE_URLS
            ):
                app.state.config.OPENAI_API_KEYS = app.state.config.OPENAI_API_KEYS[
                    : len(app.state.config.OPENAI_API_BASE_URLS)
                ]
            # if there are more urls than keys, add empty keys
            else:
                app.state.config.OPENAI_API_KEYS += [
                    ""
                    for _ in range(
                        len(app.state.config.OPENAI_API_BASE_URLS)
                        - len(app.state.config.OPENAI_API_KEYS)
                    )
                ]

        tasks = [
            fetch_url(f"{url}/models", app.state.config.OPENAI_API_KEYS[idx])
            for idx, url in enumerate(app.state.config.OPENAI_API_BASE_URLS)
        ]

        responses = await asyncio.gather(*tasks)
        log.debug(f"get_all_models:responses() {responses}")

        if raw:
            return responses

        models = {
            "data": merge_models_lists(
                list(
                    map(
                        lambda response: (
                            response["data"]
                            if (response and "data" in response)
                            else (response if isinstance(response, list) else None)
                        ),
                        responses,
                    )
                )
            )
        }

        log.debug(f"models: {models}")
        app.state.MODELS = {model["id"]: model for model in models["data"]}

    return models


@app.get("/models")
@app.get("/models/{url_idx}")
async def get_models(url_idx: Optional[int] = None, user=Depends(get_current_user)):
    if url_idx == None:
        models = await get_all_models()
        if app.state.config.ENABLE_MODEL_FILTER:
            if user.role == "user":
                models["data"] = list(
                    filter(
                        lambda model: model["id"] in app.state.config.MODEL_FILTER_LIST,
                        models["data"],
                    )
                )
                return models
        return models
    else:
        url = app.state.config.OPENAI_API_BASE_URLS[url_idx]
        key = app.state.config.OPENAI_API_KEYS[url_idx]

        headers = {}
        headers["Authorization"] = f"Bearer {key}"
        headers["Content-Type"] = "application/json"

        r = None

        try:
            r = requests.request(method="GET", url=f"{url}/models", headers=headers)
            r.raise_for_status()

            response_data = r.json()
            if "api.openai.com" in url:
                response_data["data"] = list(
                    filter(lambda model: "gpt" in model["id"], response_data["data"])
                )

            return response_data
        except Exception as e:
            log.exception(e)
            error_detail = "Open WebUI: Server Connection Error"
            if r is not None:
                try:
                    res = r.json()
                    if "error" in res:
                        error_detail = f"External: {res['error']}"
                except:
                    error_detail = f"External: {e}"

            raise HTTPException(
                status_code=r.status_code if r else 500,
                detail=error_detail,
            )


@app.post("/chat/completions")
@app.post("/chat/completions/{url_idx}")
async def generate_chat_completion(
    form_data: dict,
    url_idx: Optional[int] = None,
    user=Depends(get_verified_user),
):
    idx = 0
    payload = {**form_data}

    model_id = form_data.get("model")
    model_info = Models.get_model_by_id(model_id)

    if model_info:
        if model_info.base_model_id:
            payload["model"] = model_info.base_model_id

        model_info.params = model_info.params.model_dump()

        if model_info.params:
            if model_info.params.get("temperature", None) is not None:
                payload["temperature"] = float(model_info.params.get("temperature"))

            if model_info.params.get("top_p", None):
                payload["top_p"] = int(model_info.params.get("top_p", None))

            if model_info.params.get("max_tokens", None):
                payload["max_tokens"] = int(model_info.params.get("max_tokens", None))

            if model_info.params.get("frequency_penalty", None):
                payload["frequency_penalty"] = int(
                    model_info.params.get("frequency_penalty", None)
                )

            if model_info.params.get("seed", None):
                payload["seed"] = model_info.params.get("seed", None)

            if model_info.params.get("stop", None):
                payload["stop"] = (
                    [
                        bytes(stop, "utf-8").decode("unicode_escape")
                        for stop in model_info.params["stop"]
                    ]
                    if model_info.params.get("stop", None)
                    else None
                )

        system = model_info.params.get("system", None)
        if system:
            system = prompt_template(
                system,
                **(
                    {
                        "user_name": user.name,
                        "user_location": (
                            user.info.get("location") if user.info else None
                        ),
                    }
                    if user
                    else {}
                ),
            )
            # Check if the payload already has a system message
            # If not, add a system message to the payload
            if payload.get("messages"):
                for message in payload["messages"]:
                    if message.get("role") == "system":
                        message["content"] = system + message["content"]
                        break
                else:
                    payload["messages"].insert(
                        0,
                        {
                            "role": "system",
                            "content": system,
                        },
                    )

    else:
        pass

    model = app.state.MODELS[payload.get("model")]
    idx = model["urlIdx"]

    if "pipeline" in model and model.get("pipeline"):
        payload["user"] = {"name": user.name, "id": user.id}

    # Check if the model is "gpt-4-vision-preview" and set "max_tokens" to 4000
    # This is a workaround until OpenAI fixes the issue with this model
    if payload.get("model") == "gpt-4-vision-preview":
        if "max_tokens" not in payload:
            payload["max_tokens"] = 4000
        log.debug("Modified payload:", payload)

    # Convert the modified body back to JSON
    payload = json.dumps(payload)

    log.debug(payload)

    url = app.state.config.OPENAI_API_BASE_URLS[idx]
    key = app.state.config.OPENAI_API_KEYS[idx]

    headers = {}
    headers["Authorization"] = f"Bearer {key}"
    headers["Content-Type"] = "application/json"

    r = None
    session = None
    streaming = False

    try:
        session = aiohttp.ClientSession(trust_env=True)
        r = await session.request(
            method="POST",
            url=f"{url}/chat/completions",
            data=payload,
            headers=headers,
        )

        r.raise_for_status()

        # Check if response is SSE
        if "text/event-stream" in r.headers.get("Content-Type", ""):
            streaming = True
            return StreamingResponse(
                r.content,
                status_code=r.status,
                headers=dict(r.headers),
                background=BackgroundTask(
                    cleanup_response, response=r, session=session
                ),
            )
        else:
            response_data = await r.json()
            return response_data
    except Exception as e:
        log.exception(e)
        error_detail = "Open WebUI: Server Connection Error"
        if r is not None:
            try:
                res = await r.json()
                print(res)
                if "error" in res:
                    error_detail = f"External: {res['error']['message'] if 'message' in res['error'] else res['error']}"
            except:
                error_detail = f"External: {e}"
        raise HTTPException(status_code=r.status if r else 500, detail=error_detail)
    finally:
        if not streaming and session:
            if r:
                r.close()
            await session.close()


@app.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE"])
async def proxy(path: str, request: Request, user=Depends(get_verified_user)):
    idx = 0

    body = await request.body()

    url = app.state.config.OPENAI_API_BASE_URLS[idx]
    key = app.state.config.OPENAI_API_KEYS[idx]

    target_url = f"{url}/{path}"

    headers = {}
    headers["Authorization"] = f"Bearer {key}"
    headers["Content-Type"] = "application/json"

    r = None
    session = None
    streaming = False

    try:
        session = aiohttp.ClientSession(trust_env=True)
        r = await session.request(
            method=request.method,
            url=target_url,
            data=body,
            headers=headers,
        )

        r.raise_for_status()

        # Check if response is SSE
        if "text/event-stream" in r.headers.get("Content-Type", ""):
            streaming = True
            return StreamingResponse(
                r.content,
                status_code=r.status,
                headers=dict(r.headers),
                background=BackgroundTask(
                    cleanup_response, response=r, session=session
                ),
            )
        else:
            response_data = await r.json()
            return response_data
    except Exception as e:
        log.exception(e)
        error_detail = "Open WebUI: Server Connection Error"
        if r is not None:
            try:
                res = await r.json()
                print(res)
                if "error" in res:
                    error_detail = f"External: {res['error']['message'] if 'message' in res['error'] else res['error']}"
            except:
                error_detail = f"External: {e}"
        raise HTTPException(status_code=r.status if r else 500, detail=error_detail)
    finally:
        if not streaming and session:
            if r:
                r.close()
            await session.close()
