M5-T07: add latest-reading cards and Recharts trend charts; readings return most-recent rows
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/**
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* EnergyCharts — self-contained Recharts wrapper for Modbus device trend charts.
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*
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* Design decisions (M5 decision 11):
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* - Recharts is imported ONLY in this file (isolation, easy to swap later).
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* - The component is fully self-contained: it owns its own data fetching via
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* useReadings / useMetrics hooks and renders loading/error/empty states.
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* - Time-range selection is internal; readings are always fetched with a window
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* + limit cap — never a full-table pull.
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* - Metric labels and units come from GET /metrics; missing keys in payload are
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* tolerated (a null data point is emitted so the line simply has a gap).
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*/
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// ---------------------------------------------------------------------------
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// Recharts imports — keep ALL recharts imports inside this file.
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// ---------------------------------------------------------------------------
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import {
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LineChart,
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Line,
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XAxis,
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YAxis,
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CartesianGrid,
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Tooltip as RechartsTooltip,
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Legend,
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ResponsiveContainer,
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} from 'recharts'
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import { useState, useMemo } from 'react'
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import {
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Stack,
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Group,
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Text,
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Loader,
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Alert,
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SegmentedControl,
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Paper,
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Title,
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Badge,
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Box,
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} from '@mantine/core'
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import { useReadings, useMetrics } from './hooks'
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import type { MetricInfo } from './hooks'
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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/** Must match the limit passed to useReadings below. */
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const CHART_READINGS_LIMIT = 1000
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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interface EnergyChartsProps {
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/** UUID of the Modbus device to chart. */
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uuid: string
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/** Friendly name for the chart title. */
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deviceName: string
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}
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// ---------------------------------------------------------------------------
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// Time-range presets
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// ---------------------------------------------------------------------------
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interface TimePreset {
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label: string
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value: string
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/** How many milliseconds of history to show. */
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spanMs: number
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}
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const TIME_PRESETS: TimePreset[] = [
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{ label: '1 h', value: '1h', spanMs: 60 * 60 * 1000 },
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{ label: '6 h', value: '6h', spanMs: 6 * 60 * 60 * 1000 },
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{ label: '24 h', value: '24h', spanMs: 24 * 60 * 60 * 1000 },
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]
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const DEFAULT_PRESET = '1h'
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/** Derive ISO start/end strings for a given preset. */
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function presetWindow(spanMs: number): { start: string; end: string } {
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const end = new Date()
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const start = new Date(end.getTime() - spanMs)
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return { start: start.toISOString(), end: end.toISOString() }
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}
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// ---------------------------------------------------------------------------
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// Metric colour palette — cycles through a fixed set
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// ---------------------------------------------------------------------------
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const LINE_COLORS = [
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'#4c9cdb',
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'#f59f00',
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'#51cf66',
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'#f03e3e',
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'#cc5de8',
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'#20c997',
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'#fd7e14',
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'#74c0fc',
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]
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function lineColor(index: number): string {
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return LINE_COLORS[index % LINE_COLORS.length]
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}
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// ---------------------------------------------------------------------------
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// Helper: format a recorded_at timestamp for the X-axis tick
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// ---------------------------------------------------------------------------
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function formatTimeTick(isoString: string): string {
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try {
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const d = new Date(isoString)
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return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
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} catch {
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return isoString
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}
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}
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// ---------------------------------------------------------------------------
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// Helper: safe numeric read from payload — returns null if key absent/non-numeric
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// ---------------------------------------------------------------------------
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function safePayloadValue(
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payload: Record<string, unknown> | null | undefined,
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key: string,
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): number | null {
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if (!payload) return null
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const raw = payload[key]
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if (raw === null || raw === undefined) return null
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const n = Number(raw)
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return Number.isFinite(n) ? n : null
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}
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// ---------------------------------------------------------------------------
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// EnergyCharts component
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// ---------------------------------------------------------------------------
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export function EnergyCharts({ uuid, deviceName }: EnergyChartsProps) {
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const [activePreset, setActivePreset] = useState<string>(DEFAULT_PRESET)
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const selectedPreset = TIME_PRESETS.find((p) => p.value === activePreset) ?? TIME_PRESETS[0]
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const { start, end } = useMemo(
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() => presetWindow(selectedPreset.spanMs),
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// Recompute whenever the preset changes; intentionally excludes Date.now()
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// so the window doesn't drift on every render — it only resets on tab change.
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// eslint-disable-next-line react-hooks/exhaustive-deps
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[activePreset],
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)
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const readingsQuery = useReadings(uuid, { start, end, limit: CHART_READINGS_LIMIT })
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const metricsQuery = useMetrics(uuid)
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// -------------------------------------------------------------------------
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// Derive chart data: [{recorded_at, voltage: 230.2, current: 1.3, ...}, ...]
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// -------------------------------------------------------------------------
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const metricsData = metricsQuery.data?.metrics
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const chartData = useMemo(() => {
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const metrics: MetricInfo[] = metricsData ?? []
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const readings = readingsQuery.data?.items ?? []
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return readings.map((row) => {
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const point: Record<string, string | number | null> = {
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recorded_at: row.recorded_at,
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}
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for (const m of metrics) {
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// Tolerate missing keys — null produces a gap in the line, not a crash.
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point[m.key] = safePayloadValue(row.payload as Record<string, unknown>, m.key)
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}
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return point
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})
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}, [readingsQuery.data, metricsData])
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const metrics: MetricInfo[] = metricsQuery.data?.metrics ?? []
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// -------------------------------------------------------------------------
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// States: loading / error / empty
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// -------------------------------------------------------------------------
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const isLoading = readingsQuery.isLoading || metricsQuery.isLoading
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const isError = readingsQuery.isError || metricsQuery.isError
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/**
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* True when the returned row count equals the limit cap, meaning the window
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* contains more data than was fetched. The backend returns the most-recent N
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* rows in this case, so the chart shows the latest segment — but a hint is
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* shown so the user knows the full window is not displayed.
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*/
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const isTruncated =
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!isLoading &&
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!isError &&
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(readingsQuery.data?.items.length ?? 0) >= CHART_READINGS_LIMIT
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return (
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<Paper withBorder p="md" data-testid={`energy-charts-${uuid}`}>
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<Stack gap="sm">
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{/* Header row */}
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<Group justify="space-between" align="center" wrap="nowrap">
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<Title order={4} data-testid={`energy-charts-title-${uuid}`}>
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{deviceName}
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</Title>
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<SegmentedControl
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size="xs"
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value={activePreset}
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onChange={setActivePreset}
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data={TIME_PRESETS.map((p) => ({ value: p.value, label: p.label }))}
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data-testid={`energy-charts-preset-${uuid}`}
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/>
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</Group>
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{/* Loading */}
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{isLoading && (
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<Group justify="center" py="lg" data-testid={`energy-charts-loading-${uuid}`}>
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<Loader size="sm" />
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<Text size="sm" c="dimmed">
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Loading readings…
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</Text>
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</Group>
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)}
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{/* Error */}
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{!isLoading && isError && (
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<Alert color="red" data-testid={`energy-charts-error-${uuid}`}>
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Failed to load readings or metrics. Please try again.
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</Alert>
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)}
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{/* Empty */}
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{!isLoading && !isError && chartData.length === 0 && (
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<Text
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size="sm"
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c="dimmed"
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ta="center"
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py="lg"
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data-testid={`energy-charts-empty-${uuid}`}
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>
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No readings in this time window.
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</Text>
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)}
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{/* Truncation notice — shown when window has more data than the fetch limit */}
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{isTruncated && (
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<Text
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size="xs"
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c="dimmed"
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ta="right"
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data-testid={`energy-charts-truncated-${uuid}`}
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>
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显示最近 {CHART_READINGS_LIMIT} 条；完整长时段走势待降采样
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</Text>
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)}
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{/* Chart */}
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{!isLoading && !isError && chartData.length > 0 && (
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<Box data-testid={`energy-charts-chart-${uuid}`}>
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{/* Render one chart per metric for clarity (avoids mixed Y-axis units) */}
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{metrics.map((metric, idx) => {
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// Check if this metric has any non-null data points; skip if all null.
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const hasData = chartData.some((pt) => pt[metric.key] !== null)
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if (!hasData) return null
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return (
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<Box key={metric.key} mb="md">
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<Group gap="xs" mb={4}>
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<Text size="xs" fw={600} c="dimmed">
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{metric.label}
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</Text>
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{metric.unit && (
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<Badge size="xs" variant="outline" color="gray">
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{metric.unit}
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</Badge>
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)}
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</Group>
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<ResponsiveContainer width="100%" height={160}>
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<LineChart
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data={chartData}
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margin={{ top: 4, right: 8, left: 0, bottom: 0 }}
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>
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<CartesianGrid strokeDasharray="3 3" opacity={0.4} />
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<XAxis
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dataKey="recorded_at"
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tickFormatter={formatTimeTick}
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tick={{ fontSize: 10 }}
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minTickGap={40}
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/>
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<YAxis
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tick={{ fontSize: 10 }}
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width={50}
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tickFormatter={(v: number) =>
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metric.unit ? `${v} ${metric.unit}` : String(v)
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}
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/>
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<RechartsTooltip
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formatter={(value) => {
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const n = value as number | null | undefined
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if (n == null) return ['–', metric.label] as [string, string]
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return [
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`${n}${metric.unit ? ' ' + metric.unit : ''}`,
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metric.label,
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] as [string, string]
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}}
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labelFormatter={(label) => {
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try {
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return new Date(String(label)).toLocaleString()
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} catch {
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return String(label)
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}
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}}
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/>
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<Legend />
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<Line
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type="monotone"
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dataKey={metric.key}
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name={metric.label}
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stroke={lineColor(idx)}
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dot={false}
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isAnimationActive={false}
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connectNulls={false}
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/>
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</LineChart>
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</ResponsiveContainer>
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</Box>
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)
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})}
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</Box>
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)}
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</Stack>
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</Paper>
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)
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}
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