[FIX] Add search and fix pagination for omnichannels departments (#3621)

* [FIX] Search and pagination for omnichannels departments

* pagination complete

* minor tweak

* renamed a param and workaround for a ux bug

* fix style of flatlist and search as header scrollable

* stick the header

* Merge branch 'fix.forward-department-list' of https://github.com/RocketChat/Rocket.Chat.ReactNative into fix.forward-department-list

* refactor pagination

* fix value type

* refactor render search

* refactor layout

* make ts happy

app/lib/rocketchat/rocketchat.js

@@ -821,7 +821,6 @@ const RocketChat = {
 		return sdk.methodCallWrapper(method, ...params);
 	},
 	getUserInfo,
-
 	getUidDirectMessage(room) {
 		const { id: userId } = reduxStore.getState().login.user;
 

app/lib/rocketchat/services/restApi.ts

@@ -421,9 +421,18 @@ export const getDepartmentInfo = (departmentId: string): any =>
 	// RC 2.2.0
 	sdk.get(`livechat/department/${departmentId}?includeAgents=false`);
 
-export const getDepartments = () =>
+export const getDepartments = (args?: { count: number; offset: number; text: string }) => {
+	let params;
+	if (args) {
+		params = {
+			text: args.text,
+			count: args.count,
+			offset: args.offset
+		};
+	}
 	// RC 2.2.0
-	sdk.get('livechat/department');
+	return sdk.get('livechat/department', params);
+};
 
 export const usersAutoComplete = (selector: any) =>
 	// RC 2.4.0

app/stacks/types.ts

@@ -102,8 +102,10 @@ export type ChatsStackParamList = {
 	PickerView: {
 		title: string;
 		data: IOptionsField[];
-		value?: any; // TODO: Change
-		onChangeText?: ((text: string) => IOptionsField[]) | ((term?: string) => Promise<any>);
+		value?: string;
+		onSearch?: (text?: string) => Promise<any>;
+		onEndReached?: (text: string, offset?: number) => Promise<any>;
+		total?: number;
 		goBack?: boolean;
 		onChangeValue: Function;
 	};

app/views/ForwardLivechatView.tsx

@@ -13,8 +13,9 @@ import RocketChat from '../lib/rocketchat';
 import OrSeparator from '../containers/OrSeparator';
 import Input from '../containers/UIKit/MultiSelect/Input';
 import { forwardRoom as forwardRoomAction } from '../actions/room';
-import { ILivechatDepartment } from './definition/ILivechatDepartment';
+import { IRoom } from '../definitions';
 import { ChatsStackParamList } from '../stacks/types';
+import { IOptionsField } from './NotificationPreferencesView/options';
 
 const styles = StyleSheet.create({
 	container: {
@@ -23,14 +24,6 @@ const styles = StyleSheet.create({
 	}
 });
 
-// TODO: Refactor when migrate room
-interface IRoom {
-	departmentId?: any;
-	servedBy?: {
-		_id: string;
-	};
-}
-
 interface ITransferData {
 	roomId: string;
 	userId?: string;
@@ -41,12 +34,6 @@ interface IUser {
 	username: string;
 	_id: string;
 }
-
-interface IParsedData {
-	label: string;
-	value: string;
-}
-
 interface IForwardLivechatViewProps {
 	navigation: StackNavigationProp<ChatsStackParamList, 'ForwardLivechatView'>;
 	route: RouteProp<ChatsStackParamList, 'ForwardLivechatView'>;
@@ -54,22 +41,31 @@ interface IForwardLivechatViewProps {
 	forwardRoom: (rid: string, transferData: ITransferData) => void;
 }
 
+const COUNT_DEPARTMENT = 50;
+
 const ForwardLivechatView = ({ forwardRoom, navigation, route, theme }: IForwardLivechatViewProps) => {
-	const [departments, setDepartments] = useState<IParsedData[]>([]);
+	const [departments, setDepartments] = useState<IOptionsField[]>([]);
 	const [departmentId, setDepartment] = useState('');
-	const [users, setUsers] = useState<IParsedData[]>([]);
+	const [departmentTotal, setDepartmentTotal] = useState(0);
+	const [users, setUsers] = useState<IOptionsField[]>([]);
 	const [userId, setUser] = useState();
-	const [room, setRoom] = useState<IRoom>({});
+	const [room, setRoom] = useState<IRoom>({} as IRoom);
 
 	const rid = route.params?.rid;
 
-	const getDepartments = async () => {
+	const getDepartments = async (text = '', offset = 0) => {
 		try {
-			const result: any = await RocketChat.getDepartments();
+			const result = await RocketChat.getDepartments({ count: COUNT_DEPARTMENT, text, offset });
 			if (result.success) {
-				setDepartments(
-					result.departments.map((department: ILivechatDepartment) => ({ label: department.name, value: department._id }))
-				);
+				const parsedDepartments: IOptionsField[] = result.departments.map(department => ({
+					label: department.name,
+					value: department._id
+				}));
+				if (!text && !offset) {
+					setDepartments(parsedDepartments);
+					setDepartmentTotal(result?.total);
+				}
+				return { data: parsedDepartments, total: result?.total, offset: result?.offset };
 			}
 		} catch {
 			// do nothing
@@ -80,26 +76,27 @@ const ForwardLivechatView = ({ forwardRoom, navigation, route, theme }: IForward
 		try {
 			const { servedBy: { _id: agentId } = {} } = room;
 			const _id = agentId && { $ne: agentId };
-			const result: any = await RocketChat.usersAutoComplete({
+			const result = await RocketChat.usersAutoComplete({
 				conditions: { _id, status: { $ne: 'offline' }, statusLivechat: 'available' },
 				term
 			});
 			if (result.success) {
 				const parsedUsers = result.items.map((user: IUser) => ({ label: user.username, value: user._id }));
-				setUsers(parsedUsers);
-				return parsedUsers;
+				if (!term) {
+					setUsers(parsedUsers);
+				}
+				return { data: parsedUsers };
 			}
 		} catch {
 			// do nothing
 		}
-		return [];
 	};
 
 	const getRoom = async () => {
 		try {
 			const result = await RocketChat.getRoomInfo(rid);
 			if (result.success) {
-				setRoom(result.room);
+				setRoom(result.room as IRoom);
 			}
 		} catch {
 			// do nothing
@@ -148,6 +145,9 @@ const ForwardLivechatView = ({ forwardRoom, navigation, route, theme }: IForward
 			value: room?.departmentId,
 			data: departments,
 			onChangeValue: setDepartment,
+			onSearch: getDepartments,
+			onEndReached: getDepartments,
+			total: departmentTotal,
 			goBack: false
 		});
 	};
@@ -157,7 +157,7 @@ const ForwardLivechatView = ({ forwardRoom, navigation, route, theme }: IForward
 			title: I18n.t('Forward_to_user'),
 			data: users,
 			onChangeValue: setUser,
-			onChangeText: getUsers,
+			onSearch: getUsers,
 			goBack: false
 		});
 	};

app/views/PickerView.tsx

@@ -24,6 +24,9 @@ const styles = StyleSheet.create({
 		paddingVertical: 56,
 		...sharedStyles.textSemibold,
 		...sharedStyles.textAlignCenter
+	},
+	listNoHeader: {
+		marginTop: 32
 	}
 });
 
@@ -34,9 +37,16 @@ interface IItem {
 	theme: string;
 }
 
+interface IRenderSearch {
+	hasSearch: boolean;
+	onChangeText: (text: string) => void;
+}
+
 interface IPickerViewState {
 	data: IOptionsField[];
 	value: string;
+	total: number;
+	searchText: string;
 }
 
 interface IPickerViewProps {
@@ -54,8 +64,22 @@ const Item = React.memo(({ item, selected, onItemPress, theme }: IItem) => (
 	/>
 ));
 
+const RenderSearch = ({ hasSearch, onChangeText }: IRenderSearch) => {
+	if (!hasSearch) {
+		return <List.Separator style={styles.listNoHeader} />;
+	}
+	return (
+		<>
+			<View style={styles.search}>
+				<SearchBox onChangeText={onChangeText} />
+			</View>
+			<List.Separator />
+		</>
+	);
+};
+
 class PickerView extends React.PureComponent<IPickerViewProps, IPickerViewState> {
-	private onSearch?: ((text: string) => IOptionsField[]) | ((term?: string | undefined) => Promise<any>);
+	private onSearch?: (text?: string) => Promise<any>;
 
 	static navigationOptions = ({ route }: IPickerViewProps) => ({
 		title: route.params?.title ?? I18n.t('Select_an_option')
@@ -64,10 +88,10 @@ class PickerView extends React.PureComponent<IPickerViewProps, IPickerViewState>
 	constructor(props: IPickerViewProps) {
 		super(props);
 		const data = props.route.params?.data ?? [];
-		const value = props.route.params?.value;
-		this.state = { data, value };
-
-		this.onSearch = props.route.params?.onChangeText;
+		const value = props.route.params?.value ?? '';
+		const total = props.route.params?.total ?? 0;
+		this.state = { data, value, total, searchText: '' };
+		this.onSearch = props.route.params?.onSearch;
 	}
 
 	onChangeValue = (value: string) => {
@@ -80,28 +104,26 @@ class PickerView extends React.PureComponent<IPickerViewProps, IPickerViewState>
 		}
 	};
 
-	onChangeText = debounce(
-		async (text: string) => {
-			if (this.onSearch) {
-				const data = await this.onSearch(text);
-				this.setState({ data });
+	onChangeText = debounce(async (searchText: string) => {
+		if (this.onSearch) {
+			const data = await this.onSearch(searchText);
+			if (data?.data) {
+				this.setState({ ...data, searchText });
 			}
-		},
-		300,
-		true
-	);
-
-	renderSearch() {
-		if (!this.onSearch) {
-			return null;
 		}
+	}, 500);
 
-		return (
-			<View style={styles.search}>
-				<SearchBox onChangeText={this.onChangeText} />
-			</View>
-		);
-	}
+	onEndReached = async () => {
+		const { route } = this.props;
+		const { data, total, searchText } = this.state;
+		const onEndReached = route.params?.onEndReached;
+		if (onEndReached && data.length < total) {
+			const val = await onEndReached(searchText, data.length);
+			if (val?.data) {
+				this.setState({ ...val, data: [...data, ...val.data] });
+			}
+		}
+	};
 
 	render() {
 		const { data, value } = this.state;
@@ -109,7 +131,6 @@ class PickerView extends React.PureComponent<IPickerViewProps, IPickerViewState>
 
 		return (
 			<SafeAreaView>
-				{this.renderSearch()}
 				<FlatList
 					data={data}
 					keyExtractor={item => item.value as string}
@@ -121,13 +142,14 @@ class PickerView extends React.PureComponent<IPickerViewProps, IPickerViewState>
 							onItemPress={() => this.onChangeValue(item.value as string)}
 						/>
 					)}
+					onEndReached={() => this.onEndReached()}
+					onEndReachedThreshold={0.5}
 					ItemSeparatorComponent={List.Separator}
-					ListHeaderComponent={List.Separator}
+					ListHeaderComponent={<RenderSearch hasSearch={!!this.onSearch} onChangeText={this.onChangeText} />}
 					ListFooterComponent={List.Separator}
 					ListEmptyComponent={() => (
 						<Text style={[styles.noResult, { color: themes[theme].titleText }]}>{I18n.t('No_results_found')}</Text>
 					)}
-					contentContainerStyle={[List.styles.contentContainerStyleFlatList]}
 				/>
 			</SafeAreaView>
 		);