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// @flow
import gql from 'graphql-tag';
import { graphql } from 'react-apollo';
import queryString from 'query-string';
import { btoa } from 'b2a';
import threadInfoFragment from '../../fragments/thread/threadInfo';
import type { ThreadInfoType } from '../../fragments/thread/threadInfo';
import threadMessageConnectionFragment from '../../fragments/thread/threadMessageConnection';
import type { ThreadMessageConnectionType } from '../../fragments/thread/threadMessageConnection';
export type GetThreadMessageConnectionType = {
...$Exact<ThreadInfoType>,
...$Exact<ThreadMessageConnectionType>,
};
type Variables = {
id: string,
last?: number,
first?: number,
after?: string,
before?: string,
};
const getVariables = ({ thread, ...props }): Variables => {
// if the thread has less than 25 messages, just load all of them
if (thread && thread.messageCount <= 25) {
return {
id: props.id,
last: 25,
};
}
// If the user is linked to either a specific message or has pagination URL params, load those messages
if (props.location && props.location.search) {
const params = queryString.parse(props.location.search);
if (params) {
if (params.msgsafter) {
return {
id: props.id,
after: params.msgsafter,
first: 25,
};
} else if (params.msgsbefore) {
return {
id: props.id,
before: params.msgsbefore,
last: 25,
};
} else if (params.m) {
return {
id: props.id,
after: params.m,
first: 25,
};
}
}
}
// if it's a watercooler thread load the 25 most recent messages
if (props.isWatercooler) {
return {
id: props.id,
last: 25,
};
}
// In all other cases, load the first 25
return {
id: props.id,
first: 25,
};
};
export const getThreadMessageConnectionQuery = gql`
query getThreadMessages(
$id: ID!
$after: String
$first: Int
$before: String
$last: Int
) {
thread(id: $id) {
...threadInfo
...threadMessageConnection
}
}
${threadInfoFragment}
${threadMessageConnectionFragment}
`;
export const getThreadMessageConnectionOptions = {
// $FlowFixMe
options: props => {
return {
variables: getVariables(props),
fetchPolicy: 'cache-and-network',
};
},
// $FlowFixMe
props: props => ({
data: {
...props.data,
messageConnection: props.data.thread
? props.data.thread.messageConnection
: null,
},
loadNextPage: () => {
let cursor;
const { thread } = props.data;
if (
thread &&
thread.messageConnection &&
thread.messageConnection.edges &&
thread.messageConnection.edges.length > 0
) {
cursor =
thread.messageConnection.edges[
thread.messageConnection.edges.length - 1
].cursor;
}
return props.data.fetchMore({
variables: {
after: cursor,
first: 25,
before: undefined,
last: undefined,
},
updateQuery: (prev, { fetchMoreResult }) => {
if (!fetchMoreResult || !fetchMoreResult.thread) return prev;
return {
...prev,
thread: {
...prev.thread,
messageConnection: {
...prev.thread.messageConnection,
pageInfo: {
...prev.thread.messageConnection.pageInfo,
hasNextPage:
fetchMoreResult.thread.messageConnection.pageInfo
.hasNextPage,
},
edges: [
...prev.thread.messageConnection.edges,
...fetchMoreResult.thread.messageConnection.edges,
],
},
},
};
},
});
},
loadPreviousPage: () => {
let cursor;
const { thread } = props.data;
if (
thread &&
thread.messageConnection &&
thread.messageConnection.edges &&
thread.messageConnection.edges.length > 0
) {
cursor = thread.messageConnection.edges[0].cursor;
}
return props.data.fetchMore({
variables: {
after: undefined,
first: undefined,
before: cursor,
last: 25,
},
updateQuery: (prev, { fetchMoreResult }) => {
if (!fetchMoreResult || !fetchMoreResult.thread) return prev;
const {
messageConnection: { pageInfo, edges },
} = fetchMoreResult.thread;
return {
...prev,
thread: {
...prev.thread,
messageConnection: {
...prev.thread.messageConnection,
pageInfo: {
...prev.thread.messageConnection.pageInfo,
hasPreviousPage: pageInfo.hasPreviousPage,
},
edges: edges
? [...edges, ...prev.thread.messageConnection.edges]
: prev.thread.messageConnection.edges,
},
},
};
},
});
},
}),
};
export default graphql(
getThreadMessageConnectionQuery,
getThreadMessageConnectionOptions
);
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