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import { property } from 'lit/decorators.js';
import { CustomEventType } from '../interfaces';
import { RapidElement } from '../RapidElement';
import { Store } from '../store/Store';
import { fetchResultsPage, ResultsPage } from '../utils';
const DEFAULT_REFRESH = 10000;
export class TembaList extends RapidElement {
@property({ type: Array, attribute: false })
items: any[] = [];
@property({ type: Object, attribute: false })
selected: any;
@property({ type: Number })
cursorIndex = -1;
@property({ type: String })
endpoint: string;
@property({ type: String })
nextSelection: any;
@property({ type: Number })
tabIndex = 1;
@property({ type: String })
valueKey = 'id';
@property({ type: String })
value: string;
@property({ type: Boolean })
loading = false;
@property({ type: Boolean })
collapsed: boolean;
@property({ type: Boolean })
hideShadow: boolean;
@property({ type: Boolean })
paused = false;
@property({ type: Boolean })
internalFocusDisabled = false;
@property({ attribute: false })
getNextRefresh: (firstOption: any) => any;
@property({ attribute: false })
sanitizeOption: (option: any) => any;
@property({ attribute: false })
renderOption: (option: any, selected: boolean) => TemplateResult;
@property({ attribute: false })
renderOptionDetail: (option: any, selected: boolean) => TemplateResult;
@property({ attribute: false, type: Object })
mostRecentItem: any;
// changes to the refresh key force a refresh
@property({ type: String })
refreshKey = '0';
reverseRefresh = true;
// our next page from our endpoint
nextPage: string = null;
pages = 0;
clearRefreshTimeout: any;
pending: AbortController[] = [];
store: Store;
// used for testing only
preserve: boolean;
static get styles() {
return css`
temba-options {
display: block;
width: 100%;
flex-grow: 1;
}
`;
}
constructor() {
super();
this.store = document.querySelector('temba-store') as Store;
this.handleSelection.bind(this);
}
private reset(): void {
this.selected = null;
this.nextPage = null;
this.cursorIndex = -1;
this.mostRecentItem = null;
this.items = [];
}
refreshInterval = null;
public connectedCallback() {
super.connectedCallback();
this.refreshInterval = setInterval(() => {
if (!this.paused) {
this.refreshKey = 'default_' + new Date().getTime();
}
}, DEFAULT_REFRESH);
}
public disconnectedCallback() {
clearInterval(this.refreshInterval);
}
public willUpdate(changedProperties: PropertyValues): void {
super.willUpdate(changedProperties);
if (changedProperties.has('cursorIndex')) {
if (this.cursorIndex > -1) {
this.selected = this.items[this.cursorIndex];
}
}
if (changedProperties.has('endpoint') && this.endpoint) {
this.loading = true;
this.reset();
}
}
public updated(changedProperties: Map<string, any>) {
super.updated(changedProperties);
if (changedProperties.has('endpoint') && this.endpoint) {
this.fetchItems();
}
if (changedProperties.has('loading')) {
if (!this.loading) {
this.fireCustomEvent(CustomEventType.FetchComplete);
}
}
if (
changedProperties.has('refreshKey') &&
!changedProperties.has('endpoint')
) {
this.refreshTop();
}
if (changedProperties.has('mostRecentItem') && this.mostRecentItem) {
this.fireCustomEvent(CustomEventType.Refreshed);
}
if (changedProperties.has('cursorIndex')) {
if (this.cursorIndex > -1) {
this.handleSelected(this.selected);
}
}
if (changedProperties.has('items')) {
//
}
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
public handleSelected(selected: any) {
const evt = new Event('change', { bubbles: true });
this.dispatchEvent(evt);
}
private getValue(obj: any): any {
if (!obj) {
return null;
}
const path = this.valueKey.split('.');
let current = obj;
while (path.length > 0) {
const key = path.shift();
current = current[key];
}
return current;
}
public setSelection(value: string) {
const index = this.items.findIndex((item) => {
return this.getValue(item) === value;
});
this.cursorIndex = index;
this.selected = this.items[index];
const evt = new Event('change', { bubbles: true });
this.dispatchEvent(evt);
}
public getItemIndex(value: string) {
return this.items.findIndex((option) => this.getValue(option) === value);
}
public removeItem(value: string) {
const index = this.getItemIndex(value);
this.items.splice(index, 1);
this.items = [...this.items];
if (this.cursorIndex === index) {
this.cursorIndex = -1;
}
// request a change even if it is the same, the item is different
this.requestUpdate('cursorIndex');
this.requestUpdate('items');
}
public getSelection(): any {
return this.selected;
}
public refresh(): void {
this.refreshKey = 'requested_' + new Date().getTime();
}
public setEndpoint(endpoint: string, nextSelection: any = null) {
this.endpoint = endpoint;
this.nextSelection = nextSelection;
}
public getRefreshEndpoint() {
return this.endpoint;
}
protected sanitizeResults(results: any[]): Promise<any[]> {
return Promise.resolve(results);
}
/**
* Refreshes the first page, updating any found items in our list
*/
private async refreshTop(): Promise<void> {
const refreshEndpoint = this.getRefreshEndpoint();
if (!refreshEndpoint) {
return;
}
// cancel any outstanding requests
while (this.pending.length > 0) {
const pending = this.pending.pop();
pending.abort();
}
const controller = new AbortController();
this.pending.push(controller);
const prevItem = this.items[this.cursorIndex];
try {
const page = await fetchResultsPage(
this.getRefreshEndpoint(),
controller
);
const sanitizedResults = await this.sanitizeResults(page.results);
const items = [...this.items];
// remove any dupes already in our list
if (sanitizedResults) {
sanitizedResults.forEach((newOption: any) => {
if (this.sanitizeOption) {
this.sanitizeOption(newOption);
}
const newValue = this.getValue(newOption);
const removeIndex = items.findIndex(
(option) => this.getValue(option) === newValue
);
if (removeIndex > -1) {
items.splice(removeIndex, 1);
}
});
// insert our new items at the front
let results = sanitizedResults;
if (this.reverseRefresh) {
results = sanitizedResults.reverse();
}
const newItems = [...results, ...items];
const topItem = newItems[0];
if (
!this.mostRecentItem ||
JSON.stringify(this.mostRecentItem) !== JSON.stringify(topItem)
) {
this.mostRecentItem = topItem;
}
if (prevItem) {
const newItem = newItems[this.cursorIndex];
const prevValue = this.getValue(prevItem);
if (prevValue !== this.getValue(newItem)) {
const newIndex = newItems.findIndex(
(option) => this.getValue(option) === prevValue
);
this.cursorIndex = newIndex;
// make sure our focused item is visible
window.setTimeout(() => {
const options = this.shadowRoot.querySelector('temba-options');
if (options) {
const option =
options.shadowRoot.querySelector('.option.focused');
if (option) {
option.scrollIntoView({ block: 'end', inline: 'nearest' });
}
}
}, 0);
}
}
this.items = newItems;
}
} catch (error) {
this.paused = true;
}
}
private async fetchItems(): Promise<void> {
// cancel any outstanding requests
while (this.pending.length > 0) {
const pending = this.pending.pop();
pending.abort();
}
let endpoint = this.endpoint;
let pagesToFetch = this.pages || 1;
let pages = 0;
let nextPage = null;
let fetchedItems: any[] = [];
while (pagesToFetch > 0 && endpoint) {
const controller = new AbortController();
this.pending.push(controller);
try {
const page = await fetchResultsPage(endpoint, controller);
const sanitizedResults = await this.sanitizeResults(page.results);
// sanitize our options if necessary
if (this.sanitizeOption) {
sanitizedResults.forEach(this.sanitizeOption);
}
if (sanitizedResults) {
fetchedItems = fetchedItems.concat(sanitizedResults);
}
// save our next pages
nextPage = page.next;
endpoint = nextPage;
pagesToFetch--;
pages++;
} catch (error) {
// aborted
this.reset();
this.paused = true;
this.loading = false;
return;
}
this.nextPage = nextPage;
}
this.pages = pages;
const topItem = fetchedItems[0];
if (
!this.mostRecentItem ||
JSON.stringify(this.mostRecentItem) !== JSON.stringify(topItem)
) {
this.mostRecentItem = topItem;
}
// see if our cursor needs to move to stay on the same item
const newItem = fetchedItems[this.cursorIndex];
if (
!this.nextSelection &&
this.selected &&
newItem &&
this.getValue(newItem) !== this.getValue(this.selected)
) {
const index = fetchedItems.findIndex((item) => {
return this.getValue(item) === this.getValue(this.selected);
});
// old selection is in the new fetch
if (index > -1) {
this.cursorIndex = index;
}
// old selection is missing from the new fetch
else {
// if our index didn't change, our item still did, fire change
if (this.cursorIndex === 0) {
this.requestUpdate('cursorIndex');
}
// otherwise select the first item
else {
this.cursorIndex = 0;
}
}
}
// save our results
this.items = fetchedItems;
this.loading = false;
this.pending = [];
if (this.nextSelection) {
this.setSelection(this.nextSelection);
this.nextSelection = false;
} else {
if (this.cursorIndex === -1 && !this.isMobile()) {
this.cursorIndex = 0;
}
}
if (this.value) {
this.setSelection(this.value);
this.value = null;
} else if (this.isMobile() && !this.selected) {
this.cursorIndex = -1;
this.value = null;
this.selected = null;
const evt = new Event('change', { bubbles: true });
this.dispatchEvent(evt);
}
return Promise.resolve();
}
private handleScrollThreshold() {
if (this.nextPage && !this.loading) {
this.loading = true;
fetchResultsPage(this.nextPage).then((page: ResultsPage) => {
this.sanitizeResults(page.results).then((sanitizedResults) => {
if (this.sanitizeOption) {
sanitizedResults.forEach(this.sanitizeOption);
}
this.items = [...this.items, ...sanitizedResults];
this.nextPage = page.next;
this.pages++;
this.loading = false;
});
});
}
}
public renderHeader(): TemplateResult {
return null;
}
public renderFooter(): TemplateResult {
return null;
}
public getListStyle() {
return '';
}
protected handleSelection(event: CustomEvent) {
let index = event.detail.index;
const selected = event.detail.selected;
if (index === -1) {
index = 0;
}
this.selected = selected;
this.cursorIndex = index;
event.stopPropagation();
event.preventDefault();
}
public render(): TemplateResult {
return html`
${this.renderHeader()}
<temba-options
style="${this.getListStyle()}"
visible
block
cursorSelection
?hideShadow=${this.hideShadow}
?collapsed=${this.collapsed}
?loading=${this.loading}
?internalFocusDisabled=${this.internalFocusDisabled}
.renderOption=${this.renderOption}
.renderOptionDetail=${this.renderOptionDetail}
@temba-scroll-threshold=${this.handleScrollThreshold}
@temba-selection=${this.handleSelection.bind(this)}
.options=${this.items}
.cursorIndex=${this.cursorIndex}
>
<slot></slot>
</temba-options>
${this.renderFooter()}
`;
}
}
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