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

import aiohttp
from aiocache import cached
import requests


from fastapi import Depends, FastAPI, HTTPException, Request, APIRouter
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, StreamingResponse
from pydantic import BaseModel
from starlette.background import BackgroundTask

from open_webui.models.models import Models
from open_webui.config import (
    CACHE_DIR,
)
from open_webui.env import (
    AIOHTTP_CLIENT_TIMEOUT,
    AIOHTTP_CLIENT_TIMEOUT_OPENAI_MODEL_LIST,
    ENABLE_FORWARD_USER_INFO_HEADERS,
    BYPASS_MODEL_ACCESS_CONTROL,
)

from open_webui.constants import ERROR_MESSAGES
from open_webui.env import ENV, SRC_LOG_LEVELS


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

from open_webui.utils.auth import get_admin_user, get_verified_user
from open_webui.utils.access_control import has_access


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


##########################################
#
# Utility functions
#
##########################################


async def send_get_request(url, key=None):
    timeout = aiohttp.ClientTimeout(total=AIOHTTP_CLIENT_TIMEOUT_OPENAI_MODEL_LIST)
    try:
        async with aiohttp.ClientSession(timeout=timeout, trust_env=True) as session:
            async with session.get(
                url, headers={**({"Authorization": f"Bearer {key}"} if key else {})}
            ) 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 openai_o1_handler(payload):
    """
    Handle O1 specific parameters
    """
    if "max_tokens" in payload:
        # Remove "max_tokens" from the payload
        payload["max_completion_tokens"] = payload["max_tokens"]
        del payload["max_tokens"]

    # Fix: O1 does not support the "system" parameter, Modify "system" to "user"
    if payload["messages"][0]["role"] == "system":
        payload["messages"][0]["role"] = "user"

    return payload


##########################################
#
# API routes
#
##########################################

router = APIRouter()


@router.get("/config")
async def get_config(request: Request, user=Depends(get_admin_user)):
    return {
        "ENABLE_OPENAI_API": request.app.state.config.ENABLE_OPENAI_API,
        "OPENAI_API_BASE_URLS": request.app.state.config.OPENAI_API_BASE_URLS,
        "OPENAI_API_KEYS": request.app.state.config.OPENAI_API_KEYS,
        "OPENAI_API_CONFIGS": request.app.state.config.OPENAI_API_CONFIGS,
    }


class OpenAIConfigForm(BaseModel):
    ENABLE_OPENAI_API: Optional[bool] = None
    OPENAI_API_BASE_URLS: list[str]
    OPENAI_API_KEYS: list[str]
    OPENAI_API_CONFIGS: dict


@router.post("/config/update")
async def update_config(
    request: Request, form_data: OpenAIConfigForm, user=Depends(get_admin_user)
):
    request.app.state.config.ENABLE_OPENAI_API = form_data.ENABLE_OPENAI_API
    request.app.state.config.OPENAI_API_BASE_URLS = form_data.OPENAI_API_BASE_URLS
    request.app.state.config.OPENAI_API_KEYS = form_data.OPENAI_API_KEYS

    # Check if API KEYS length is same than API URLS length
    if len(request.app.state.config.OPENAI_API_KEYS) != len(
        request.app.state.config.OPENAI_API_BASE_URLS
    ):
        if len(request.app.state.config.OPENAI_API_KEYS) > len(
            request.app.state.config.OPENAI_API_BASE_URLS
        ):
            request.app.state.config.OPENAI_API_KEYS = (
                request.app.state.config.OPENAI_API_KEYS[
                    : len(request.app.state.config.OPENAI_API_BASE_URLS)
                ]
            )
        else:
            request.app.state.config.OPENAI_API_KEYS += [""] * (
                len(request.app.state.config.OPENAI_API_BASE_URLS)
                - len(request.app.state.config.OPENAI_API_KEYS)
            )

    request.app.state.config.OPENAI_API_CONFIGS = form_data.OPENAI_API_CONFIGS

    # Remove any extra configs
    config_urls = request.app.state.config.OPENAI_API_CONFIGS.keys()
    for idx, url in enumerate(request.app.state.config.OPENAI_API_BASE_URLS):
        if url not in config_urls:
            request.app.state.config.OPENAI_API_CONFIGS.pop(url, None)

    return {
        "ENABLE_OPENAI_API": request.app.state.config.ENABLE_OPENAI_API,
        "OPENAI_API_BASE_URLS": request.app.state.config.OPENAI_API_BASE_URLS,
        "OPENAI_API_KEYS": request.app.state.config.OPENAI_API_KEYS,
        "OPENAI_API_CONFIGS": request.app.state.config.OPENAI_API_CONFIGS,
    }


@router.post("/audio/speech")
async def speech(request: Request, user=Depends(get_verified_user)):
    idx = None
    try:
        idx = request.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)

        url = request.app.state.config.OPENAI_API_BASE_URLS[idx]

        r = None
        try:
            r = requests.post(
                url=f"{url}/audio/speech",
                data=body,
                headers={
                    "Content-Type": "application/json",
                    "Authorization": f"Bearer {request.app.state.config.OPENAI_API_KEYS[idx]}",
                    **(
                        {
                            "HTTP-Referer": "https://openwebui.com/",
                            "X-Title": "Open WebUI",
                        }
                        if "openrouter.ai" in url
                        else {}
                    ),
                    **(
                        {
                            "X-OpenWebUI-User-Name": user.name,
                            "X-OpenWebUI-User-Id": user.id,
                            "X-OpenWebUI-User-Email": user.email,
                            "X-OpenWebUI-User-Role": user.role,
                        }
                        if ENABLE_FORWARD_USER_INFO_HEADERS
                        else {}
                    ),
                },
                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)

            detail = None
            if r is not None:
                try:
                    res = r.json()
                    if "error" in res:
                        detail = f"External: {res['error']}"
                except Exception:
                    detail = f"External: {e}"

            raise HTTPException(
                status_code=r.status_code if r else 500,
                detail=detail if detail else "Open WebUI: Server Connection Error",
            )

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


async def get_all_models_responses(request: Request) -> list:
    if not request.app.state.config.ENABLE_OPENAI_API:
        return []

    # Check if API KEYS length is same than API URLS length
    num_urls = len(request.app.state.config.OPENAI_API_BASE_URLS)
    num_keys = len(request.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 = request.app.state.config.OPENAI_API_KEYS[:num_urls]
            request.app.state.config.OPENAI_API_KEYS = new_keys
        # if there are more urls than keys, add empty keys
        else:
            request.app.state.config.OPENAI_API_KEYS += [""] * (num_urls - num_keys)

    request_tasks = []
    for idx, url in enumerate(request.app.state.config.OPENAI_API_BASE_URLS):
        if url not in request.app.state.config.OPENAI_API_CONFIGS:
            request_tasks.append(
                send_get_request(
                    f"{url}/models", request.app.state.config.OPENAI_API_KEYS[idx]
                )
            )
        else:
            api_config = request.app.state.config.OPENAI_API_CONFIGS.get(url, {})

            enable = api_config.get("enable", True)
            model_ids = api_config.get("model_ids", [])

            if enable:
                if len(model_ids) == 0:
                    request_tasks.append(
                        send_get_request(
                            f"{url}/models",
                            request.app.state.config.OPENAI_API_KEYS[idx],
                        )
                    )
                else:
                    model_list = {
                        "object": "list",
                        "data": [
                            {
                                "id": model_id,
                                "name": model_id,
                                "owned_by": "openai",
                                "openai": {"id": model_id},
                                "urlIdx": idx,
                            }
                            for model_id in model_ids
                        ],
                    }

                    request_tasks.append(
                        asyncio.ensure_future(asyncio.sleep(0, model_list))
                    )
            else:
                request_tasks.append(asyncio.ensure_future(asyncio.sleep(0, None)))

    responses = await asyncio.gather(*request_tasks)

    for idx, response in enumerate(responses):
        if response:
            url = request.app.state.config.OPENAI_API_BASE_URLS[idx]
            api_config = request.app.state.config.OPENAI_API_CONFIGS.get(url, {})

            prefix_id = api_config.get("prefix_id", None)

            if prefix_id:
                for model in (
                    response if isinstance(response, list) else response.get("data", [])
                ):
                    model["id"] = f"{prefix_id}.{model['id']}"

    log.debug(f"get_all_models:responses() {responses}")
    return responses


async def get_filtered_models(models, user):
    # Filter models based on user access control
    filtered_models = []
    for model in models.get("data", []):
        model_info = Models.get_model_by_id(model["id"])
        if model_info:
            if user.id == model_info.user_id or has_access(
                user.id, type="read", access_control=model_info.access_control
            ):
                filtered_models.append(model)
    return filtered_models


@cached(ttl=3)
async def get_all_models(request: Request) -> dict[str, list]:
    log.info("get_all_models()")

    if not request.app.state.config.ENABLE_OPENAI_API:
        return {"data": []}

    responses = await get_all_models_responses(request)

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

    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 request.app.state.config.OPENAI_API_BASE_URLS[idx]
                        or not any(
                            name in model["id"]
                            for name in [
                                "babbage",
                                "dall-e",
                                "davinci",
                                "embedding",
                                "tts",
                                "whisper",
                            ]
                        )
                    ]
                )

        return merged_list

    models = {"data": merge_models_lists(map(extract_data, responses))}
    log.debug(f"models: {models}")

    request.app.state.OPENAI_MODELS = {model["id"]: model for model in models["data"]}
    return models


@router.get("/models")
@router.get("/models/{url_idx}")
async def get_models(
    request: Request, url_idx: Optional[int] = None, user=Depends(get_verified_user)
):
    models = {
        "data": [],
    }

    if url_idx is None:
        models = await get_all_models(request)
    else:
        url = request.app.state.config.OPENAI_API_BASE_URLS[url_idx]
        key = request.app.state.config.OPENAI_API_KEYS[url_idx]

        r = None
        async with aiohttp.ClientSession(
            timeout=aiohttp.ClientTimeout(
                total=AIOHTTP_CLIENT_TIMEOUT_OPENAI_MODEL_LIST
            )
        ) as session:
            try:
                async with session.get(
                    f"{url}/models",
                    headers={
                        "Authorization": f"Bearer {key}",
                        "Content-Type": "application/json",
                        **(
                            {
                                "X-OpenWebUI-User-Name": user.name,
                                "X-OpenWebUI-User-Id": user.id,
                                "X-OpenWebUI-User-Email": user.email,
                                "X-OpenWebUI-User-Role": user.role,
                            }
                            if ENABLE_FORWARD_USER_INFO_HEADERS
                            else {}
                        ),
                    },
                ) as r:
                    if r.status != 200:
                        # Extract response error details if available
                        error_detail = f"HTTP Error: {r.status}"
                        res = await r.json()
                        if "error" in res:
                            error_detail = f"External Error: {res['error']}"
                        raise Exception(error_detail)

                    response_data = await r.json()

                    # Check if we're calling OpenAI API based on the URL
                    if "api.openai.com" in url:
                        # Filter models according to the specified conditions
                        response_data["data"] = [
                            model
                            for model in response_data.get("data", [])
                            if not any(
                                name in model["id"]
                                for name in [
                                    "babbage",
                                    "dall-e",
                                    "davinci",
                                    "embedding",
                                    "tts",
                                    "whisper",
                                ]
                            )
                        ]

                    models = response_data
            except aiohttp.ClientError as e:
                # ClientError covers all aiohttp requests issues
                log.exception(f"Client error: {str(e)}")
                raise HTTPException(
                    status_code=500, detail="Open WebUI: Server Connection Error"
                )
            except Exception as e:
                log.exception(f"Unexpected error: {e}")
                error_detail = f"Unexpected error: {str(e)}"
                raise HTTPException(status_code=500, detail=error_detail)

    if user.role == "user" and not BYPASS_MODEL_ACCESS_CONTROL:
        models["data"] = get_filtered_models(models, user)

    return models


class ConnectionVerificationForm(BaseModel):
    url: str
    key: str


@router.post("/verify")
async def verify_connection(
    form_data: ConnectionVerificationForm, user=Depends(get_admin_user)
):
    url = form_data.url
    key = form_data.key

    async with aiohttp.ClientSession(
        timeout=aiohttp.ClientTimeout(total=AIOHTTP_CLIENT_TIMEOUT_OPENAI_MODEL_LIST)
    ) as session:
        try:
            async with session.get(
                f"{url}/models",
                headers={
                    "Authorization": f"Bearer {key}",
                    "Content-Type": "application/json",
                },
            ) as r:
                if r.status != 200:
                    # Extract response error details if available
                    error_detail = f"HTTP Error: {r.status}"
                    res = await r.json()
                    if "error" in res:
                        error_detail = f"External Error: {res['error']}"
                    raise Exception(error_detail)

                response_data = await r.json()
                return response_data

        except aiohttp.ClientError as e:
            # ClientError covers all aiohttp requests issues
            log.exception(f"Client error: {str(e)}")
            raise HTTPException(
                status_code=500, detail="Open WebUI: Server Connection Error"
            )
        except Exception as e:
            log.exception(f"Unexpected error: {e}")
            error_detail = f"Unexpected error: {str(e)}"
            raise HTTPException(status_code=500, detail=error_detail)


@router.post("/chat/completions")
async def generate_chat_completion(
    request: Request,
    form_data: dict,
    user=Depends(get_verified_user),
    bypass_filter: Optional[bool] = False,
):
    if BYPASS_MODEL_ACCESS_CONTROL:
        bypass_filter = True

    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)

    # Check model info and override the payload
    if model_info:
        if model_info.base_model_id:
            payload["model"] = model_info.base_model_id
            model_id = 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)

        # Check if user has access to the model
        if not bypass_filter and user.role == "user":
            if not (
                user.id == model_info.user_id
                or has_access(
                    user.id, type="read", access_control=model_info.access_control
                )
            ):
                raise HTTPException(
                    status_code=403,
                    detail="Model not found",
                )
    elif not bypass_filter:
        if user.role != "admin":
            raise HTTPException(
                status_code=403,
                detail="Model not found",
            )

    model = request.app.state.OPENAI_MODELS.get(model_id)
    if model:
        idx = model["urlIdx"]
    else:
        raise HTTPException(
            status_code=404,
            detail="Model not found",
        )

    # Get the API config for the model
    api_config = request.app.state.config.OPENAI_API_CONFIGS.get(
        request.app.state.config.OPENAI_API_BASE_URLS[idx], {}
    )

    prefix_id = api_config.get("prefix_id", None)
    if prefix_id:
        payload["model"] = payload["model"].replace(f"{prefix_id}.", "")

    # Add user info to the payload if the model is a pipeline
    if "pipeline" in model and model.get("pipeline"):
        payload["user"] = {
            "name": user.name,
            "id": user.id,
            "email": user.email,
            "role": user.role,
        }

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

    # Fix: O1 does not support the "max_tokens" parameter, Modify "max_tokens" to "max_completion_tokens"
    is_o1 = payload["model"].lower().startswith("o1-")
    if is_o1:
        payload = openai_o1_handler(payload)
    elif "api.openai.com" not in url:
        # Remove "max_completion_tokens" from the payload for backward compatibility
        if "max_completion_tokens" in payload:
            payload["max_tokens"] = payload["max_completion_tokens"]
            del payload["max_completion_tokens"]

    if "max_tokens" in payload and "max_completion_tokens" in payload:
        del payload["max_tokens"]

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

    r = None
    session = None
    streaming = False
    response = None

    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={
                "Authorization": f"Bearer {key}",
                "Content-Type": "application/json",
                **(
                    {
                        "HTTP-Referer": "https://openwebui.com/",
                        "X-Title": "Open WebUI",
                    }
                    if "openrouter.ai" in url
                    else {}
                ),
                **(
                    {
                        "X-OpenWebUI-User-Name": user.name,
                        "X-OpenWebUI-User-Id": user.id,
                        "X-OpenWebUI-User-Email": user.email,
                        "X-OpenWebUI-User-Role": user.role,
                    }
                    if ENABLE_FORWARD_USER_INFO_HEADERS
                    else {}
                ),
            },
        )

        # 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:
            try:
                response = await r.json()
            except Exception as e:
                log.error(e)
                response = await r.text()

            r.raise_for_status()
            return response
    except Exception as e:
        log.exception(e)

        detail = None
        if isinstance(response, dict):
            if "error" in response:
                detail = f"{response['error']['message'] if 'message' in response['error'] else response['error']}"
        elif isinstance(response, str):
            detail = response

        raise HTTPException(
            status_code=r.status if r else 500,
            detail=detail if detail else "Open WebUI: Server Connection Error",
        )
    finally:
        if not streaming and session:
            if r:
                r.close()
            await session.close()


@router.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE"])
async def proxy(path: str, request: Request, user=Depends(get_verified_user)):
    """
    Deprecated: proxy all requests to OpenAI API
    """

    body = await request.body()

    idx = 0
    url = request.app.state.config.OPENAI_API_BASE_URLS[idx]
    key = request.app.state.config.OPENAI_API_KEYS[idx]

    r = None
    session = None
    streaming = False

    try:
        session = aiohttp.ClientSession(trust_env=True)
        r = await session.request(
            method=request.method,
            url=f"{url}/{path}",
            data=body,
            headers={
                "Authorization": f"Bearer {key}",
                "Content-Type": "application/json",
                **(
                    {
                        "X-OpenWebUI-User-Name": user.name,
                        "X-OpenWebUI-User-Id": user.id,
                        "X-OpenWebUI-User-Email": user.email,
                        "X-OpenWebUI-User-Role": user.role,
                    }
                    if ENABLE_FORWARD_USER_INFO_HEADERS
                    else {}
                ),
            },
        )
        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)

        detail = None
        if r is not None:
            try:
                res = await r.json()
                print(res)
                if "error" in res:
                    detail = f"External: {res['error']['message'] if 'message' in res['error'] else res['error']}"
            except Exception:
                detail = f"External: {e}"
        raise HTTPException(
            status_code=r.status if r else 500,
            detail=detail if detail else "Open WebUI: Server Connection Error",
        )
    finally:
        if not streaming and session:
            if r:
                r.close()
            await session.close()