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import gql from 'graphql-tag';
import React from 'react';
import { useCallback, useState, useContext, useEffect } from 'react';
import { Redirect } from 'react-router-dom';
import { useApolloClient } from '@apollo/react-hooks';
import styled from 'styled-components';
import ChatNavbar from './ChatNavbar';
import MessageInput from './MessageInput';
import MessagesList from './MessagesList';
import { History } from 'history';
import {
useGetChatQuery,
useAddMessageMutation,
GetChatQuery,
GetChatQueryVariables,
GetChatDocument,
} from '../../graphql/types';
import * as fragments from '../../graphql/fragments';
import { writeMessage } from '../../services/cache.service';
const Container = styled.div`
background: url(/assets/chat-background.jpg);
display: flex;
flex-flow: column;
height: 100vh;
`;
// eslint-disable-next-line
const getChatQuery = gql`
query GetChat($chatId: ID!, $limit: Int!, $after: Float) {
chat(chatId: $chatId) {
...FullChat
}
}
${fragments.fullChat}
`;
// eslint-disable-next-line
const addMessageMutation = gql`
mutation AddMessage($chatId: ID!, $content: String!) {
addMessage(chatId: $chatId, content: $content) {
...Message
}
}
${fragments.message}
`;
const PaginationContext = React.createContext({
after: 0,
limit: 20,
/**
* Sets new cursor
*/
setAfter: (after: number) => {},
/**
* Resets `after` value to its inital state (null) so
*/
reset: () => {},
});
const usePagination = () => {
const pagination = useContext(PaginationContext);
// Resets the pagination every time a component did unmount
useEffect(() => {
return () => {
pagination.reset();
};
}, [pagination]);
return pagination;
};
export const ChatPaginationProvider = ({ children }: { children: any }) => {
const [after, setAfter] = useState<number | null>(null);
return (
<PaginationContext.Provider
value={{
limit: 20,
after: after!,
setAfter,
reset: () => setAfter(null),
}}>
{children}
</PaginationContext.Provider>
);
};
export const useGetChatPrefetch = () => {
const client = useApolloClient();
const { limit, after } = usePagination();
return (chatId: string) => {
client.query<GetChatQuery, GetChatQueryVariables>({
query: GetChatDocument,
variables: {
chatId,
after,
limit,
},
});
};
};
interface ChatRoomScreenParams {
chatId: string;
history: History;
}
const ChatRoom: React.FC<ChatRoomScreenParams> = ({ history, chatId }) => {
const { after, limit, setAfter } = usePagination();
const { data, loading, fetchMore } = useGetChatQuery({
variables: { chatId, after, limit },
});
const [addMessage] = useAddMessageMutation();
const onSendMessage = useCallback(
(content: string) => {
if (data === undefined) {
return null;
}
const chat = data.chat;
if (chat === null) return null;
addMessage({
variables: { chatId, content },
optimisticResponse: {
__typename: 'Mutation',
addMessage: {
__typename: 'Message',
id: Math.random().toString(36).substr(2, 9),
createdAt: new Date(),
isMine: true,
chat: {
__typename: 'Chat',
id: chatId,
},
content,
},
},
update: (client, { data }) => {
if (data && data.addMessage) {
writeMessage(client, data.addMessage);
}
},
});
},
[data, chatId, addMessage]
);
useEffect(() => {
if (!after) {
return;
}
// every time after changes its value, fetch more messages
fetchMore({
variables: {
after,
limit,
},
updateQuery(prev, { fetchMoreResult }) {
const messages = [
...fetchMoreResult!.chat!.messages.messages,
...prev.chat!.messages.messages,
];
return {
...prev,
chat: {
...prev.chat!,
messages: {
...fetchMoreResult!.chat!.messages,
messages,
},
},
};
},
});
}, [after, limit, fetchMore]);
if (data === undefined) {
return null;
}
const chat = data.chat;
const loadingChat = loading;
if (loadingChat) return null;
if (chat === null) return null;
// Chat was probably removed from cache by the subscription handler
if (!chat) {
return <Redirect to="/chats" />;
}
return (
<Container>
{chat?.id && <ChatNavbar chat={chat} history={history} />}
{chat?.messages && (
<MessagesList
messages={chat.messages.messages}
hasMore={chat.messages.hasMore}
loadMore={() => setAfter(chat.messages.cursor!)}
/>
)}
<MessageInput onSendMessage={onSendMessage} />
</Container>
);
};
const ChatRoomScreen: React.FC<ChatRoomScreenParams> = ({
history,
chatId,
}) => {
return (
<ChatPaginationProvider>
<ChatRoom history={history} chatId={chatId} />
</ChatPaginationProvider>
);
};
export default ChatRoomScreen;
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