import json
import logging
from typing import Optional


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


from open_webui.socket.main import sio, get_user_ids_from_room
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,
    MessageResponse,
    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, get_users_with_access
from open_webui.utils.webhook import post_webhook

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(None, 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 user.role != "admin" and 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 MessageUserResponse(MessageResponse):
    user: UserNameResponse


@router.get("/{id}/messages", response_model=list[MessageUserResponse])
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 user.role != "admin" and 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

        replies = Messages.get_replies_by_message_id(message.id)
        latest_reply_at = replies[0].created_at if replies else None

        messages.append(
            MessageUserResponse(
                **{
                    **message.model_dump(),
                    "reply_count": len(replies),
                    "latest_reply_at": latest_reply_at,
                    "reactions": Messages.get_reactions_by_message_id(message.id),
                    "user": UserNameResponse(**users[message.user_id].model_dump()),
                }
            )
        )

    return messages


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


async def send_notification(webui_url, channel, message, active_user_ids):
    users = get_users_with_access("read", channel.access_control)

    for user in users:
        if user.id in active_user_ids:
            continue
        else:
            if user.settings:
                webhook_url = user.settings.ui.get("notifications", {}).get(
                    "webhook_url", None
                )

                if webhook_url:
                    post_webhook(
                        webhook_url,
                        f"#{channel.name} - {webui_url}/channels/{channel.id}\n\n{message.content}",
                        {
                            "action": "channel",
                            "message": message.content,
                            "title": channel.name,
                            "url": f"{webui_url}/channels/{channel.id}",
                        },
                    )


@router.post("/{id}/messages/post", response_model=Optional[MessageModel])
async def post_new_message(
    request: Request,
    id: str,
    form_data: MessageForm,
    background_tasks: BackgroundTasks,
    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 user.role != "admin" and 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:
            event_data = {
                "channel_id": channel.id,
                "message_id": message.id,
                "data": {
                    "type": "message",
                    "data": MessageUserResponse(
                        **{
                            **message.model_dump(),
                            "reply_count": 0,
                            "latest_reply_at": None,
                            "reactions": Messages.get_reactions_by_message_id(
                                message.id
                            ),
                            "user": UserNameResponse(**user.model_dump()),
                        }
                    ).model_dump(),
                },
                "user": UserNameResponse(**user.model_dump()).model_dump(),
                "channel": channel.model_dump(),
            }

            await sio.emit(
                "channel-events",
                event_data,
                to=f"channel:{channel.id}",
            )

            if message.parent_id:
                # If this message is a reply, emit to the parent message as well
                parent_message = Messages.get_message_by_id(message.parent_id)

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

            active_user_ids = get_user_ids_from_room(f"channel:{channel.id}")

            background_tasks.add_task(
                send_notification,
                request.app.state.config.WEBUI_URL,
                channel,
                message,
                active_user_ids,
            )

        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()
        )


############################
# GetChannelMessage
############################


@router.get("/{id}/messages/{message_id}", response_model=Optional[MessageUserResponse])
async def get_channel_message(
    id: str, message_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 user.role != "admin" and 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 = Messages.get_message_by_id(message_id)
    if not message:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if message.channel_id != id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )

    return MessageUserResponse(
        **{
            **message.model_dump(),
            "user": UserNameResponse(
                **Users.get_user_by_id(message.user_id).model_dump()
            ),
        }
    )


############################
# GetChannelThreadMessages
############################


@router.get(
    "/{id}/messages/{message_id}/thread", response_model=list[MessageUserResponse]
)
async def get_channel_thread_messages(
    id: str,
    message_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 user.role != "admin" and 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_parent_id(id, message_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(
            MessageUserResponse(
                **{
                    **message.model_dump(),
                    "reply_count": 0,
                    "latest_reply_at": None,
                    "reactions": Messages.get_reactions_by_message_id(message.id),
                    "user": UserNameResponse(**users[message.user_id].model_dump()),
                }
            )
        )

    return messages


############################
# UpdateMessageById
############################


@router.post(
    "/{id}/messages/{message_id}/update", response_model=Optional[MessageModel]
)
async def update_message_by_id(
    id: str, 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 user.role != "admin" and 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 = Messages.get_message_by_id(message_id)
    if not message:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if message.channel_id != id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )

    try:
        message = Messages.update_message_by_id(message_id, form_data)
        message = Messages.get_message_by_id(message_id)

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


############################
# AddReactionToMessage
############################


class ReactionForm(BaseModel):
    name: str


@router.post("/{id}/messages/{message_id}/reactions/add", response_model=bool)
async def add_reaction_to_message(
    id: str, message_id: str, form_data: ReactionForm, 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 user.role != "admin" and 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 = Messages.get_message_by_id(message_id)
    if not message:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if message.channel_id != id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )

    try:
        Messages.add_reaction_to_message(message_id, user.id, form_data.name)
        message = Messages.get_message_by_id(message_id)

        await sio.emit(
            "channel-events",
            {
                "channel_id": channel.id,
                "message_id": message.id,
                "data": {
                    "type": "message:reaction:add",
                    "data": {
                        **message.model_dump(),
                        "user": UserNameResponse(
                            **Users.get_user_by_id(message.user_id).model_dump()
                        ).model_dump(),
                        "name": form_data.name,
                    },
                },
                "user": UserNameResponse(**user.model_dump()).model_dump(),
                "channel": channel.model_dump(),
            },
            to=f"channel:{channel.id}",
        )

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


############################
# RemoveReactionById
############################


@router.post("/{id}/messages/{message_id}/reactions/remove", response_model=bool)
async def remove_reaction_by_id_and_user_id_and_name(
    id: str, message_id: str, form_data: ReactionForm, 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 user.role != "admin" and 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 = Messages.get_message_by_id(message_id)
    if not message:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if message.channel_id != id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )

    try:
        Messages.remove_reaction_by_id_and_user_id_and_name(
            message_id, user.id, form_data.name
        )

        message = Messages.get_message_by_id(message_id)

        await sio.emit(
            "channel-events",
            {
                "channel_id": channel.id,
                "message_id": message.id,
                "data": {
                    "type": "message:reaction:remove",
                    "data": {
                        **message.model_dump(),
                        "user": UserNameResponse(
                            **Users.get_user_by_id(message.user_id).model_dump()
                        ).model_dump(),
                        "name": form_data.name,
                    },
                },
                "user": UserNameResponse(**user.model_dump()).model_dump(),
                "channel": channel.model_dump(),
            },
            to=f"channel:{channel.id}",
        )

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


############################
# DeleteMessageById
############################


@router.delete("/{id}/messages/{message_id}/delete", response_model=bool)
async def delete_message_by_id(
    id: str, message_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 user.role != "admin" and 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 = Messages.get_message_by_id(message_id)
    if not message:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND
        )

    if message.channel_id != id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail=ERROR_MESSAGES.DEFAULT()
        )

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

        if message.parent_id:
            # If this message is a reply, emit to the parent message as well
            parent_message = Messages.get_message_by_id(message.parent_id)

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

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