397 lines
12 KiB
Svelte
397 lines
12 KiB
Svelte
<script lang="ts">
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import { onDestroy, onMount } from 'svelte';
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import { fade } from 'svelte/transition';
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import { storedLocation } from '$lib/stores/settings';
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import {
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buildAverageSeries,
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buildCurrentTimeSeries,
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buildDaylightSeries,
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buildModelSeries,
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calculateAverage,
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composeChartOption,
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findUnit,
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getThemeColors
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} from '$lib/utils/echarts';
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import { ChartContainer, ChartToolbar, EChart } from '$lib/components/charts';
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import '$lib/components/charts/echarts.css';
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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 '$lib/components/ui/switch';
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import {
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type MarkArea,
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type ModelCompareResult,
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fetchModelComparison
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} from '$lib/services/weather';
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import { hourly, models as modelsFlat } 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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import type * as echarts from 'echarts';
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const models = [modelsFlat];
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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: EChart[] = $state([]);
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let chartInstances: echarts.ECharts[] = $state([]);
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let chartOptions: Array<Record<string, unknown>> = $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: [
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'temperature_2m',
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'rain',
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'relative_humidity_2m',
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'wind_speed_10m',
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'wind_direction_10m'
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],
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models: [
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'ecmwf_ifs',
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'ecmwf_ifs025',
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'meteofrance_seamless',
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'ukmo_seamless',
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'icon_seamless',
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'gem_seamless',
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'gfs_seamless'
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]
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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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markAreas: MarkArea[];
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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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mounted = true;
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});
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onDestroy(() => {
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chartInstances = [];
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chartOptions = [];
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chartComponents = [];
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});
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// ─── Chart Instance Tracking ────────────────────────────────────────────────
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function handleChartReady(chart: echarts.ECharts): void {
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chartInstances = [...chartInstances, chart];
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}
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// chart components persist across refetches (options update in place), so
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// the registry is never reset; only instances disposed because the chart
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// count shrank are filtered out
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let liveCharts = $derived(chartInstances.filter((chart) => !chart.isDisposed()));
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// ─── Data Fetching (only when params.hourly or params.models change) ───────
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$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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markAreas: result.markAreas,
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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 Option Building (runs when fetchedData OR display toggles change) ─
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$effect(() => {
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if (!fetchedData) return;
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const { hourly: hourlyData, hourly_units, timezone, markAreas, timestamps } = fetchedData;
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const _showLegend = showLegend;
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const colors = getThemeColors();
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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 newOptions: Array<Record<string, unknown>> = [];
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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 series: Array<Record<string, unknown>> = [];
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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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const seriesData = (values as (number | null)[]).map(
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(val, idx) => [timestamps[idx], val] as [number, number | null]
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);
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series.push(
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buildModelSeries({
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name: model,
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data: seriesData,
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unit
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})
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);
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}
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const { average } = calculateAverage(hourlyData, variable, timeLength);
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const averageData = average.map((val, idx) => [timestamps[idx], val] as [number, number]);
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series.push(buildAverageSeries({ variable, data: averageData, unit }));
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series.push(buildCurrentTimeSeries());
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const daylightSeries = buildDaylightSeries({ markAreas });
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if (daylightSeries) {
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series.push(daylightSeries);
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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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const option = composeChartOption({
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title: isFirst
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? {
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text: 'Model Compare',
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subtext: `Compare ${chartVariables.join(', ') || ''} in models: ${params.models?.join(', ') || ''}`
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}
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: null,
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tooltip: { unit, timezone },
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legend: { show: _showLegend },
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grid: {
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hasTitle: isFirst,
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hasSubtitle: isFirst,
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showLegend: _showLegend
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},
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yAxis: { unit },
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series,
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toolbox: false,
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showCredit: isLast,
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colors,
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timezone
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});
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newOptions.push(option);
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}
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chartOptions = newOptions;
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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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<ChartContainer {loading} chartCount={chartOptions.length} chartHeight={showLegend ? 400 : 300}>
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{#each chartOptions as option, i (i)}
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<EChart
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{option}
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notMerge
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height={showLegend ? '400px' : '300px'}
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onChartReady={handleChartReady}
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bind:this={chartComponents[i]}
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/>
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{/each}
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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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