380 lines
12 KiB
Svelte
380 lines
12 KiB
Svelte
<script lang="ts">
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import { onMount } from 'svelte';
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import { get } from 'svelte/store';
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import { fade } from 'svelte/transition';
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import { storedLocation, storedModel } from '$lib/stores/settings';
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import { ChartContainer, ChartToolbar } from '$lib/components/charts';
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import { Checkbox } from '$lib/components/ui/checkbox';
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import { Label } from '$lib/components/ui/label';
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import { Switch } from '$lib/components/ui/switch';
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import {
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CHART_COLORS,
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CanvasChart,
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type ChartSeries,
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SERIES_COLORS,
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calculateAverage,
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findUnit,
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isColumnUnit
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} from '$lib/charts';
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import {
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type DaylightBand,
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type ModelCompareResult,
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fetchModelComparison
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} from '$lib/services/weather';
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import { hourly, modelGroups } from '../../options';
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import { defaultParameters } from '../../options';
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import ModelPictogramTimeline from './ModelPictogramTimeline.svelte';
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import type { PageData } from './$types';
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const models = modelGroups.map((group) => group.models);
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const CHART_GROUP = 'model-compare';
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// ─── Display State (does NOT trigger data re-fetch) ─────────────────────────
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let showLegend = $state(false);
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// ─── Data Fetch State ───────────────────────────────────────────────────────
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let chartComponents: CanvasChart[] = $state([]);
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let mounted = $state(false);
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let loading = $state(true);
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let loadError = $state<string | null>(null);
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let requestVersion = 0;
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let { data }: { data: PageData } = $props();
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// the URL is the source of truth: location comes from the load function,
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// which is also correct on hydrated prerendered pages. The persisted store
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// only mirrors it so the header and bare /weather/* redirects follow along.
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let location = $derived(data.location);
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$effect(() => {
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storedLocation.set(data.location);
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});
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let params = $state({
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...defaultParameters,
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hourly: ['temperature_2m', 'rain', 'relative_humidity_2m', 'wind_speed_10m'],
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models: ['ecmwf_ifs', 'meteofrance_seamless', 'ukmo_seamless', 'icon_seamless', 'gfs_seamless']
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});
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// ─── Cached API Response ────────────────────────────────────────────────────
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interface FetchedData {
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hourly: Record<string, unknown>;
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hourly_units: Record<string, string>;
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timezone: string;
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daylightBands: DaylightBand[];
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timestamps: number[];
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sunrise: number[];
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sunset: number[];
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}
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let fetchedData: FetchedData | null = $state(null);
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// ─── Lifecycle ──────────────────────────────────────────────────────────────
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onMount(() => {
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// the model chosen elsewhere on the site is always part of the comparison
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const selectedModel = get(storedModel);
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if (selectedModel !== 'best_match' && !params.models.includes(selectedModel)) {
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params.models = [selectedModel, ...params.models];
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}
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mounted = true;
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});
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// components persist across refetches; entries are null while unmounted
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let liveCharts = $derived(chartComponents.filter((chart) => chart != null));
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// ─── Data Fetching (only when params.hourly or params.models change) ───────
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$effect(() => {
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const hourlyVars = params.hourly;
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const modelList = params.models;
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if (!mounted || !hourlyVars?.length || !modelList?.length) return;
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const loc = location;
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// versioned so a slow stale response can never overwrite a newer one
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const version = ++requestVersion;
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loading = true;
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loadError = null;
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fetchModelComparison({
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latitude: loc.latitude!,
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longitude: loc.longitude!,
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hourlyVariables: [...new Set([...hourlyVars, 'weather_code'])],
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models: modelList,
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temperature_unit: params.temperature_unit as 'celsius' | 'fahrenheit',
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wind_speed_unit: params.wind_speed_unit as 'kmh' | 'ms' | 'mph' | 'kn',
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precipitation_unit: params.precipitation_unit as 'mm' | 'inch',
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timezone: loc.timezone
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})
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.then((result: ModelCompareResult) => {
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if (version !== requestVersion) return;
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fetchedData = {
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hourly: result.hourlyFlat,
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hourly_units: result.hourlyUnitsFlat,
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timezone: result.timezone,
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daylightBands: result.daylightBands,
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timestamps: result.timestamps,
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sunrise: result.sunrise,
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sunset: result.sunset
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};
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loading = false;
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})
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.catch((err: unknown) => {
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if (version !== requestVersion) return;
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loadError = err instanceof Error ? err.message : String(err);
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loading = false;
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});
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});
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// ─── Chart Building (runs when fetchedData or the variable list changes) ────
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// Timestamps from the service are in milliseconds; CanvasChart uses seconds.
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let timestampsSec = $derived.by(() =>
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fetchedData ? fetchedData.timestamps.map((t) => t / 1000) : []
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);
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interface ChartDef {
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title?: string;
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subtitle?: string;
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unit: string;
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showCredit: boolean;
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series: ChartSeries[];
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}
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let chartDefs = $derived.by((): ChartDef[] => {
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if (!fetchedData) return [];
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const { hourly: hourlyData, hourly_units, timestamps } = fetchedData;
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const chartVariables = params.hourly?.filter((v) => v !== 'weather_code') || [];
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const variableCount = chartVariables.length;
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const timeLength = timestamps.length;
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const defs: ChartDef[] = [];
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for (let vi = 0; vi < variableCount; vi++) {
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const variable = chartVariables[vi];
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const unit = findUnit(hourly_units, hourlyData, variable);
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const isColumn = isColumnUnit(unit);
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const series: ChartSeries[] = [];
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let modelIndex = 0;
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for (const [model, values] of Object.entries(hourlyData)) {
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if (model === 'time') continue;
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if (!model.startsWith(variable)) continue;
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series.push({
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name: model,
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type: isColumn ? 'bar' : 'line',
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color: SERIES_COLORS[modelIndex % SERIES_COLORS.length],
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data: values as (number | null)[],
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width: 2
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});
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modelIndex++;
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}
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const { average } = calculateAverage(hourlyData, variable, timeLength);
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series.push({
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name: variable + '_average',
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type: isColumn ? 'bar' : 'line',
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color: CHART_COLORS.average,
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data: average,
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width: 4,
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dashed: !isColumn
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});
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const isFirst = vi === 0;
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const isLast = vi === variableCount - 1;
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defs.push({
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title: isFirst ? 'Model Compare' : undefined,
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subtitle: isFirst
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? `Compare ${chartVariables.join(', ') || ''} in models: ${params.models?.join(', ') || ''}`
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: undefined,
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unit,
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showCredit: isLast,
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series
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});
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}
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return defs;
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});
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</script>
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<!-- ─── Chart Area ─────────────────────────────────────────────────────────── -->
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{#if loadError}
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<div
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class="mb-4 rounded-md border border-destructive/50 bg-destructive/10 px-4 py-3 text-sm text-destructive"
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>
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Failed to load weather data: {loadError}
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</div>
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{/if}
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<!-- chart count derives from the selected variables (not the fetched data),
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so the reserved height is right even before the response arrives -->
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<ChartContainer
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{loading}
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chartCount={params.hourly?.filter((v) => v !== 'weather_code').length || 1}
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chartHeight={300}
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>
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{#if fetchedData}
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{#each chartDefs as def, i (i)}
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<CanvasChart
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bind:this={chartComponents[i]}
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timestamps={timestampsSec}
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timezone={fetchedData.timezone}
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series={def.series}
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bands={fetchedData.daylightBands}
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unit={def.unit}
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title={def.title}
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subtitle={def.subtitle}
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showCredit={def.showCredit}
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{showLegend}
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height={300}
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group={CHART_GROUP}
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/>
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{/each}
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{/if}
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</ChartContainer>
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{#if fetchedData && !loading}
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<ModelPictogramTimeline
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timestamps={fetchedData.timestamps}
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hourlyFlat={fetchedData.hourly as Record<string, number[]>}
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models={params.models || []}
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sunrise={fetchedData.sunrise}
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sunset={fetchedData.sunset}
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timezone={fetchedData.timezone}
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/>
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{/if}
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<!-- ─── Toolbar: Controls + Download ───────────────────────────────────────── -->
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<div class="mt-6 md:mt-10">
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<ChartToolbar charts={liveCharts} fileName="model-comparison">
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{#snippet controls()}
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<div class="flex gap-2">
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<Switch id="show_legend" name="Show legend" bind:checked={showLegend} />
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<Label for="show_legend" class="mb-0.5 cursor-pointer text-lg">Show legend</Label>
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</div>
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{/snippet}
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</ChartToolbar>
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</div>
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<!-- ─── Models Selection ───────────────────────────────────────────────────── -->
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<div class="mt-4 md:mt-8">
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<div class="flex">
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<a href="#models"><h2 id="models" class="text-2xl md:text-3xl">Models</h2></a>
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{#if params.models && params.models.length > 0}
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<div transition:fade={{ duration: 200 }} class="relative mt-1.25">
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<div
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class="absolute -top-1 ml-2 rounded-full border-2 border-foreground/25 bg-secondary px-3 py-1 text-sm no-underline"
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>
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{params.models?.length || 0} / {models.flat().length}
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</div>
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</div>
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{/if}
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</div>
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<div class="mt-2 grid sm:grid-cols-2 lg:grid-cols-3 2xl:grid-cols-4">
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{#each models as group, i (i)}
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<div class="mb-3">
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{#each group as item (item.value)}
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{@const { value, label } = item as { value: string; label: string }}
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<div class="group flex items-center" title={label}>
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<Checkbox
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id="{value}_model"
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class="border-border-dark cursor-pointer bg-muted/50 duration-100 group-hover:border-[currentColor]"
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{value}
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checked={params.models?.includes(value)}
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aria-labelledby="{value}_label"
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onCheckedChange={() => {
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if (params.models?.includes(value)) {
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params.models = params.models.filter((item) => {
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return item !== value;
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});
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} else if (params.models) {
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params.models = [...params.models, value];
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}
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}}
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/>
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<Label
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id="{value}_model_label"
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for="{value}_model"
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class="cursor-pointer truncate py-[0.1rem] pl-[0.42rem]">{label}</Label
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>
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</div>
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{/each}
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</div>
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{/each}
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</div>
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<!-- ─── Hourly Variables Selection ─────────────────────────────────────── -->
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<div class="mt-6 md:mt-12">
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<div class="flex">
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<a href="#hourly_weather_variables"
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><h2 id="hourly_weather_variables" class="text-2xl md:text-3xl">
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Hourly Weather Variables
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</h2></a
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>
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{#if params.hourly && params.hourly.length > 0}
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<div transition:fade={{ duration: 200 }} class="relative mt-1.25">
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<div
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class="absolute -top-1 ml-2 rounded-full border-2 border-foreground/25 bg-secondary px-3 py-1 text-sm no-underline"
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>
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{params.hourly?.length || 0} / {hourly.flat().length}
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</div>
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</div>
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{/if}
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</div>
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<div
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class="mt-2 grid grid-flow-row gap-x-2 gap-y-2 sm:grid-cols-2 lg:grid-cols-3 2xl:grid-cols-4"
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>
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{#each hourly as group, i (i)}
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<div>
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{#each group as { value, label } (value)}
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<div class="group flex items-center" title={label}>
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<Checkbox
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id="{value}_hourly"
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class="border-border-dark cursor-pointer bg-muted/50 duration-100 group-hover:border-[currentColor]"
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{value}
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checked={params.hourly?.includes(value)}
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aria-labelledby="{value}_label"
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onCheckedChange={() => {
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if (params.hourly?.includes(value)) {
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params.hourly = params.hourly.filter((item) => {
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return item !== value;
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});
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} else if (params.hourly) {
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params.hourly = [...params.hourly, value];
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}
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}}
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/>
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<Label
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id="{value}_label"
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for="{value}_hourly"
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class="cursor-pointer truncate py-[0.1rem] pl-[0.42rem]">{label}</Label
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>
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</div>
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{/each}
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</div>
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{/each}
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</div>
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</div>
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</div>
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