from fastapi import APIRouter, Depends, status

from app.config import settings
from app.exceptions import UserDontHavePermissionException, MessageNotFoundException, UserCanNotReadThisChatException
from app.chat.shemas import (
	SMessage,
	SLastMessages,
	SPinnedChat,
	SDeletedUser,
	SDeletedChat,
	SAllowedChats,
	SMessageList,
	SPinnedChats,
	SPinnedMessages
)
from app.unit_of_work import UnitOfWork
from app.users.dependencies import check_verificated_user_with_exc
from app.utils.auth import AuthService, encode_invitation_token, decode_invitation_token
from app.users.schemas import SCreateInvitationLink, SUser, SInvitationData

router = APIRouter(prefix="/chat", tags=["Чат"])


@router.get(
	"",
	status_code=status.HTTP_200_OK,
	response_model=SAllowedChats,
)
async def get_all_chats(user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	async with uow:
		result = await uow.user.get_user_allowed_chats(user.id)
		return {"allowed_chats": result}


@router.post(
	"/create_chat",
	status_code=status.HTTP_201_CREATED,
	response_model=None,
)
async def create_chat(
		user_to_exclude: int,
		chat_name: str,
		user: SUser = Depends(check_verificated_user_with_exc),
		uow=Depends(UnitOfWork)
):
	if user.id == user_to_exclude:
		raise UserCanNotReadThisChatException
	async with uow:
		chat_id = await uow.chat.create(user_id=user_to_exclude, chat_name=chat_name, created_by=user.id)
		await uow.chat.add_user_to_chat(user.id, chat_id)
		await uow.chat.add_user_to_chat(settings.ADMIN_USER_ID, chat_id)
		await uow.commit()


@router.get(
	"/get_last_message/{chat_id}",
	status_code=status.HTTP_200_OK,
	response_model=SMessageList,
)
async def get_last_message(chat_id: int, user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	async with uow:
		message = await uow.chat.get_some_messages(chat_id=chat_id, message_number_from=0, messages_to_get=1)
		if message is None:
			raise MessageNotFoundException
		for mes in message:
			mes["created_at"] = mes["created_at"].isoformat()
		return {"messages": message}


@router.get(
	"/get_some_messages/{chat_id}",
	status_code=status.HTTP_200_OK,
	response_model=SMessageList,
)
async def get_some_messages(
		chat_id: int,
		last_messages: SLastMessages = Depends(),
		user: SUser = Depends(check_verificated_user_with_exc),
		uow=Depends(UnitOfWork)
):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	async with uow:
		messages = await uow.chat.get_some_messages(
			chat_id=chat_id,
			message_number_from=last_messages.messages_loaded,
			messages_to_get=last_messages.messages_to_get
		)
		if not messages:
			raise MessageNotFoundException
		for mes in messages:
			mes["created_at"] = mes["created_at"].isoformat()
		return {"messages": messages}


@router.get(
	"/message/{chat_id}",
	status_code=status.HTTP_200_OK,
	response_model=SMessage,
)
async def get_message_by_id(
		chat_id: int,
		message_id: int,
		user: SUser = Depends(check_verificated_user_with_exc),
		uow=Depends(UnitOfWork)
):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	async with uow:
		message = await uow.chat.get_message_by_id(message_id=message_id)
		if not message:
			raise MessageNotFoundException
		message = dict(message)
		message["created_at"] = message["created_at"].isoformat()
		return message


@router.get(
	"/create_invitation_link",
	status_code=status.HTTP_201_CREATED,
	response_model=SCreateInvitationLink,
)
async def create_invitation_link(
		chat_id: int,
		user: SUser = Depends(check_verificated_user_with_exc),
		uow=Depends(UnitOfWork)
):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	invitation_data = SInvitationData.model_validate({"chat_id": chat_id})
	invitation_token = encode_invitation_token(invitation_data)
	invitation_link = settings.INVITATION_LINK_HOST + "/api/chat/invite_to_chat/" + invitation_token
	return {"invitation_link": invitation_link}


@router.get(
	"/invite_to_chat/{invitation_token}",
	status_code=status.HTTP_200_OK,
	response_model=None,
)
async def invite_to_chat(
		invitation_token: str,
		user: SUser = Depends(check_verificated_user_with_exc),
		uow=Depends(UnitOfWork)
):
	invitation_data = decode_invitation_token(invitation_token)
	async with uow:
		chat = await uow.chat.find_one_or_none(id=invitation_data.chat_id)
		if user.id == chat.chat_for:
			raise UserCanNotReadThisChatException
		await uow.chat.add_user_to_chat(chat_id=invitation_data.chat_id, user_id=user.id)
		await uow.commit()


@router.delete(
	"/delete_chat/{chat_id}",
	status_code=status.HTTP_200_OK,
	response_model=SDeletedChat,
)
async def delete_chat(chat_id: int, user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	async with uow:
		chat = await uow.chat.find_one_or_none(id=chat_id)
		if user.id == chat.created_by:
			return {"deleted_chat": await uow.chat.delete_chat(chat_id)}
		raise UserDontHavePermissionException


@router.delete(
	"/delete_user_from_chat/{chat_id}",
	status_code=status.HTTP_200_OK,
	response_model=SDeletedUser,
)
async def delete_user_from_chat(
		chat_id: int,
		user_id: int,
		user: SUser = Depends(check_verificated_user_with_exc),
		uow=Depends(UnitOfWork)
):
	async with uow:
		chat = await uow.chat.find_one_or_none(id=chat_id)
		if user.id == chat.created_by:
			return {"deleted_user": await uow.chat.delete_user(chat_id=chat_id, user_id=user_id)}
		raise UserDontHavePermissionException


@router.post(
	"/pin_chat",
	status_code=status.HTTP_200_OK,
	response_model=SPinnedChat,
)
async def pinn_chat(chat_id: int, user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	async with uow:
		await uow.chat.pin_chat(chat_id=chat_id, user_id=user.id)
		return {"chat_id": chat_id, "user_id": user.id}


@router.delete(
	"/unpin_chat",
	status_code=status.HTTP_200_OK,
	response_model=SPinnedChat,
)
async def unpinn_chat(chat_id: int, user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	async with uow:
		await uow.chat.unpin_chat(chat_id=chat_id, user_id=user.id)
		return {"chat_id": chat_id, "user_id": user.id}


@router.get(
	"/get_pinned_chats",
	status_code=status.HTTP_200_OK,
	response_model=SPinnedChats,
)
async def get_pinned_chats(user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	async with uow:
		return {"pinned_chats": await uow.chat.get_pinned_chats(user_id=user.id)}


@router.get(
	"/pinned_messages/{chat_id}",
	status_code=status.HTTP_200_OK,
	response_model=SPinnedMessages,
)
async def pinned_messages(chat_id: int, user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
	await AuthService.validate_user_access_to_chat(uow=uow, chat_id=chat_id, user_id=user.id)
	async with uow:
		messages = await uow.chat.get_pinned_messages(chat_id=chat_id)
		if messages:
			for mes in messages:
				mes["created_at"] = mes["created_at"].isoformat()
		return {"pinned_messages": messages}