Add LVGMC warning map workflow
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import { createEffect, createMemo, createResource, createSignal, For, onMount, Show } from 'solid-js';
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import { apiHost } from '../../consts';
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import { download } from '../../helpers/download';
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import { LoadingSpinner } from '../../components/spinner/LoadingSpinner';
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import { drawWarningMap, type WeatherWarning, warningSeverity } from './warningDraw';
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import { warningTemplates, type WarningOutput } from './warningTemplates';
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import './warnings.css';
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type WarningResponse = { source: string; fetchedAt: string; warnings: WeatherWarning[] };
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const fetchWarnings = async (): Promise<WarningResponse> => {
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const response = await fetch(`${apiHost}/api/warnings`);
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if (!response.ok) throw new Error(`Warnings failed (${response.status})`);
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return response.json();
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};
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export function Warnings() {
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const [output, setOutput] = createSignal<WarningOutput>('3840x1440');
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const [title, setTitle] = createSignal('');
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const [selectedDate, setSelectedDate] = createSignal('all');
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const [phenomenon, setPhenomenon] = createSignal('all');
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const [background, setBackground] = createSignal<HTMLImageElement>();
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const [data, { refetch }] = createResource(fetchWarnings);
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let canvas!: HTMLCanvasElement;
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const template = () => warningTemplates[output()];
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const loadedWarnings = () => data.error ? [] : data()?.warnings ?? [];
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const availableDates = createMemo(() => warningDates(loadedWarnings()));
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const phenomena = createMemo(() => [...new Set(loadedWarnings().map(item => item.phenomenon).filter(Boolean))].sort((a, b) => a.localeCompare(b, 'lv')));
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const filteredWarnings = createMemo(() => loadedWarnings().filter(warning => {
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const dateMatches = selectedDate() === 'all' || activeOnDate(warning, selectedDate());
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const phenomenonMatches = phenomenon() === 'all' || warning.phenomenon === phenomenon();
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return dateMatches && phenomenonMatches;
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}));
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const loadBackground = () => {
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const image = new Image();
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image.onload = () => setBackground(image);
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image.src = template().map;
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};
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onMount(loadBackground);
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createEffect(() => { output(); loadBackground(); });
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createEffect(() => {
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const image = background();
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const current = template();
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const warnings = filteredWarnings();
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const currentTitle = title();
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if (!canvas || !image) return;
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if (canvas.width !== current.width) canvas.width = current.width;
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if (canvas.height !== current.height) canvas.height = current.height;
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void document.fonts.load(`700 ${current.title.fontSize}px Monda`).then(() =>
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drawWarningMap(canvas.getContext('2d')!, image, current, warnings, currentTitle),
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);
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});
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const downloadPng = () => canvas.toBlob(blob => blob && download(blob, `bridinajumi-${output()}.png`), 'image/png');
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return <section class="pageWorkspace warningsPage">
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<div class="pageHeading warningsHeading">
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<div><span class="eyebrow">ĒTERA GRAFIKA</span><h1>Brīdinājumi</h1><p>Aktuālie LVĢMC brīdinājumu poligoni un manuāli ievadāms virsraksts.</p></div>
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<span class="selectionCount">{filteredWarnings().length} {filteredWarnings().length === 1 ? 'brīdinājums' : 'brīdinājumi'}</span>
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</div>
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<section class="warningsSetup" aria-labelledby="warnings-settings">
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<div><h2 id="warnings-settings">1. Izvēlies izmēru</h2><div class="resolutionChoices">
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<button classList={{ active: output() === '1920x1080' }} onClick={() => setOutput('1920x1080')}>1920 × 1080</button>
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<button classList={{ active: output() === '3840x1440' }} onClick={() => setOutput('3840x1440')}>3840 × 1440</button>
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</div></div>
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<div class="warningFilters"><h2>2. Izvēlies brīdinājumu</h2><div class="warningFilterGrid">
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<label><span>Diena</span><select value={selectedDate()} onChange={event => setSelectedDate(event.currentTarget.value)}><option value="all">Viss periods</option><For each={availableDates()}>{date => <option value={date}>{formatDate(date)}</option>}</For></select></label>
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<label><span>Parādība</span><select value={phenomenon()} onChange={event => setPhenomenon(event.currentTarget.value)}><option value="all">Visas parādības</option><For each={phenomena()}>{item => <option value={item}>{item}</option>}</For></select></label>
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<label class="warningTitle"><span>Virsraksts</span><input type="text" value={title()} placeholder="BRĪDINĀJUMS PAR STIPRU VĒJU" onInput={event => setTitle(event.currentTarget.value)} /></label>
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</div></div>
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</section>
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<Show when={data.loading}><LoadingSpinner text="Ielādē LVĢMC brīdinājumus"/></Show>
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<Show when={data.error}><div class="inlineNotice error"><strong>Brīdinājumu datus neizdevās ielādēt.</strong><button class="secondary" onClick={() => refetch()}>Mēģināt vēlreiz</button></div></Show>
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<Show when={!data.loading && !data.error && filteredWarnings().length === 0}><div class="inlineNotice">Izvēlētajam periodam nav aktīvu brīdinājumu. Karti joprojām var priekšskatīt, bet tajā nebūs iekrāsotu teritoriju.</div></Show>
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<Show when={filteredWarnings().length > 0}><div class="warningSummary"><For each={filteredWarnings()}>{warning => <article class={`warningCard ${warningSeverity(warning.intensity)}`}><strong>{warning.phenomenon || 'Brīdinājums'}</strong><span>{warning.intensity} · {warning.regions}</span><small>{formatPeriod(warning.validFrom, warning.validUntil)}</small></article>}</For></div></Show>
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<section class="warningsPreview"><div class="mapToolbar"><div><strong>3. Kartes priekšskatījums</strong><span>{template().width} × {template().height} px eksports</span></div><button class="primary" disabled={data.loading || Boolean(data.error)} onClick={downloadPng}>Lejupielādēt PNG</button></div><div class="canvasFrame"><canvas ref={canvas} width={template().width} height={template().height}/></div></section>
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</section>;
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}
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function datePart(value: string) {
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const match = value.trim().match(/^(\d{4}-\d{2}-\d{2})/);
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return match?.[1];
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}
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function warningDates(warnings: WeatherWarning[]) {
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const dates = new Set<string>();
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warnings.forEach(warning => {
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const from = datePart(warning.validFrom);
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const until = datePart(warning.validUntil);
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if (!from || !until) return;
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const cursor = new Date(`${from}T12:00:00Z`);
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const last = new Date(`${until}T12:00:00Z`);
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while (cursor.getTime() <= last.getTime()) {
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dates.add(cursor.toISOString().slice(0, 10));
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cursor.setUTCDate(cursor.getUTCDate() + 1);
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}
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});
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return [...dates].sort();
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}
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function activeOnDate(warning: WeatherWarning, date: string) {
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const from = datePart(warning.validFrom);
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const until = datePart(warning.validUntil);
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if (!from || !until) return false;
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return from <= date && until >= date;
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}
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function formatDate(value: string) {
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return new Intl.DateTimeFormat('lv-LV', { timeZone: 'Europe/Riga', weekday: 'short', day: '2-digit', month: '2-digit' }).format(new Date(`${value}T12:00:00Z`));
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}
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function formatPeriod(fromValue: string, untilValue: string) {
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const compact = (value: string) => value.trim().replace(/^(\d{4})-(\d{2})-(\d{2})[ T](\d{2}):(\d{2}).*$/, '$3.$2. $4:$5');
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return `${compact(fromValue)}–${compact(untilValue)}`;
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}
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