import json
import logging
from typing import Optional


from fastapi import APIRouter, Depends, HTTPException, Request, status
from pydantic import BaseModel


from open_webui.socket.main import sio
from open_webui.models.users import Users, UserNameResponse

from open_webui.models.channels import Channels, ChannelModel, ChannelForm
from open_webui.models.messages import Messages, MessageModel, MessageForm


from open_webui.config import ENABLE_ADMIN_CHAT_ACCESS, ENABLE_ADMIN_EXPORT
from open_webui.constants import ERROR_MESSAGES
from open_webui.env import SRC_LOG_LEVELS


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["MODELS"])

router = APIRouter()

############################
# GetChatList
############################


@router.get("/", response_model=list[ChannelModel])
async def get_channels(user=Depends(get_verified_user)):
    if user.role == "admin":
        return Channels.get_channels()
    else:
        return Channels.get_channels_by_user_id(user.id)


############################
# CreateNewChannel
############################


@router.post("/create", response_model=Optional[ChannelModel])
async def create_new_channel(form_data: ChannelForm, user=Depends(get_admin_user)):
    try:
        channel = Channels.insert_new_channel(form_data, user.id)
        return ChannelModel(**channel.model_dump())
    except Exception as e:
        log.exception(e)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )


############################
# GetChannelById
############################


@router.get("/{id}", response_model=Optional[ChannelModel])
async def get_channel_by_id(id: str, user=Depends(get_verified_user)):
    channel = Channels.get_channel_by_id(id)
    if not channel:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if not has_access(user.id, type="read", access_control=channel.access_control):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail=ERROR_MESSAGES.DEFAULT()
        )

    return ChannelModel(**channel.model_dump())


############################
# UpdateChannelById
############################


@router.post("/{id}/update", response_model=Optional[ChannelModel])
async def update_channel_by_id(
    id: str, form_data: ChannelForm, user=Depends(get_admin_user)
):
    channel = Channels.get_channel_by_id(id)
    if not channel:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    try:
        channel = Channels.update_channel_by_id(id, form_data)
        return ChannelModel(**channel.model_dump())
    except Exception as e:
        log.exception(e)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )


############################
# DeleteChannelById
############################


@router.delete("/{id}/delete", response_model=bool)
async def delete_channel_by_id(id: str, user=Depends(get_admin_user)):
    channel = Channels.get_channel_by_id(id)
    if not channel:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    try:
        Channels.delete_channel_by_id(id)
        return True
    except Exception as e:
        log.exception(e)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )


############################
# GetChannelMessages
############################


class MessageUserModel(MessageModel):
    user: UserNameResponse


@router.get("/{id}/messages", response_model=list[MessageUserModel])
async def get_channel_messages(
    id: str, skip: int = 0, limit: int = 50, user=Depends(get_verified_user)
):
    channel = Channels.get_channel_by_id(id)
    if not channel:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if not has_access(user.id, type="read", access_control=channel.access_control):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail=ERROR_MESSAGES.DEFAULT()
        )

    message_list = Messages.get_messages_by_channel_id(id, skip, limit)
    users = {}

    messages = []
    for message in message_list:
        if message.user_id not in users:
            user = Users.get_user_by_id(message.user_id)
            users[message.user_id] = user

        messages.append(
            MessageUserModel(
                **{
                    **message.model_dump(),
                    "user": UserNameResponse(**users[message.user_id].model_dump()),
                }
            )
        )

    return messages


############################
# PostNewMessage
############################


@router.post("/{id}/messages/post", response_model=Optional[MessageModel])
async def post_new_message(
    id: str, form_data: MessageForm, user=Depends(get_verified_user)
):
    channel = Channels.get_channel_by_id(id)
    if not channel:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if not has_access(user.id, type="read", access_control=channel.access_control):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail=ERROR_MESSAGES.DEFAULT()
        )

    try:
        message = Messages.insert_new_message(form_data, channel.id, user.id)

        if message:
            await sio.emit(
                "channel-events",
                {
                    "channel_id": channel.id,
                    "message_id": message.id,
                    "data": {
                        "type": "message",
                        "data": {
                            **message.model_dump(),
                            "user": UserNameResponse(**user.model_dump()).model_dump(),
                        },
                    },
                },
                to=f"channel:{channel.id}",
            )

        return MessageModel(**message.model_dump())
    except Exception as e:
        log.exception(e)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )