import asyncio
import hashlib
import json
import logging
from pathlib import Path
from typing import Literal, Optional, overload

import aiohttp
import requests
from open_webui.apps.webui.models.models import Models
from open_webui.config import (
    AIOHTTP_CLIENT_TIMEOUT,
    CACHE_DIR,
    CORS_ALLOW_ORIGIN,
    ENABLE_MODEL_FILTER,
    ENABLE_OPENAI_API,
    MODEL_FILTER_LIST,
    OPENAI_API_BASE_URLS,
    OPENAI_API_KEYS,
    AppConfig,
)
from open_webui.constants import ERROR_MESSAGES
from open_webui.env import SRC_LOG_LEVELS
from fastapi import Depends, FastAPI, HTTPException, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, StreamingResponse
from pydantic import BaseModel
from starlette.background import BackgroundTask


from open_webui.utils.payload import (
    apply_model_params_to_body_openai,
    apply_model_system_prompt_to_body,
)

from open_webui.utils.utils import get_admin_user, get_verified_user

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

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=CORS_ALLOW_ORIGIN,
    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()

    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 Exception:
                    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
                ]
            )

    return merged_list


def is_openai_api_disabled():
    api_keys = app.state.config.OPENAI_API_KEYS
    no_keys = len(api_keys) == 1 and api_keys[0] == ""
    return no_keys or not app.state.config.ENABLE_OPENAI_API


async def get_all_models_raw() -> list:
    if is_openai_api_disabled():
        return []

    # Check if API KEYS length is same than API URLS length
    num_urls = len(app.state.config.OPENAI_API_BASE_URLS)
    num_keys = len(app.state.config.OPENAI_API_KEYS)

    if num_keys != num_urls:
        # if there are more keys than urls, remove the extra keys
        if num_keys > num_urls:
            new_keys = app.state.config.OPENAI_API_KEYS[:num_urls]
            app.state.config.OPENAI_API_KEYS = new_keys
        # if there are more urls than keys, add empty keys
        else:
            app.state.config.OPENAI_API_KEYS += [""] * (num_urls - num_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}")

    return responses


@overload
async def get_all_models(raw: Literal[True]) -> list: ...


@overload
async def get_all_models(raw: Literal[False] = False) -> dict[str, list]: ...


async def get_all_models(raw=False) -> dict[str, list] | list:
    log.info("get_all_models()")
    if is_openai_api_disabled():
        return [] if raw else {"data": []}

    responses = await get_all_models_raw()
    if raw:
        return responses

    def extract_data(response):
        if response and "data" in response:
            return response["data"]
        if isinstance(response, list):
            return response
        return None

    models = {"data": merge_models_lists(map(extract_data, 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_verified_user)):
    if url_idx is 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 Exception:
                    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}

    if "metadata" in payload:
        del payload["metadata"]

    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

        params = model_info.params.model_dump()
        payload = apply_model_params_to_body_openai(params, payload)
        payload = apply_model_system_prompt_to_body(params, payload, user)

    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,
            "email": user.email,
            "role": user.role,
        }

    # 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"
    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
    session = None
    streaming = False

    try:
        session = aiohttp.ClientSession(
            trust_env=True, timeout=aiohttp.ClientTimeout(total=AIOHTTP_CLIENT_TIMEOUT)
        )
        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 Exception:
                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 Exception:
                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()