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// src/TangoExplorerLogic.tsx
// ─────────────────────────────────────────────────────────────
import { useMemo, useEffect, useRef, useState } from 'react';
import * as Apollo from '@apollo/client';
import { useWidgetRefreshRate } from '@ska-octopus-widget-sdk/widget-sdk';
import { OP_DEVICES, OP_ATTRIBUTES } from './graphql/ops';
export interface TangoExplorerLogicConfig {
instanceId?: string;
tangoDB?: string | string[];
useEnumLabels?: boolean;
}
type DeviceInfo = { name: string; server: { id: string }; state?: string | number };
const useQuery = Apollo.useQuery;
/* shallow compare for { deviceName → state } maps */
function shallowEqual(a: Record<string, string>, b: Record<string, string>): boolean {
Iif (a === b) return true;
const ka = Object.keys(a);
const kb = Object.keys(b);
if (ka.length !== kb.length) return false;
for (const k of ka) Iif (a[k] !== b[k]) return false;
return true;
}
function normalizeEndpoints(input: unknown): string[] {
const uniq = new Set<string>();
const push = (value: unknown) => {
const normalized = String(value ?? '').trim();
Eif (normalized) uniq.add(normalized);
};
if (Array.isArray(input)) {
input.forEach(push);
E} else if (typeof input === 'string') {
const raw = input.trim();
if (!raw) return [];
if (raw.startsWith('[') && raw.endsWith(']')) {
try {
const parsed = JSON.parse(raw);
if (Array.isArray(parsed)) parsed.forEach(push);
} catch {
raw.split(',').forEach(push);
}
} else if (raw.includes(',')) {
raw.split(',').forEach(push);
} else {
push(raw);
}
} else if (input != null) {
push(input);
}
return Array.from(uniq);
}
export function useTangoExplorerLogic(config: TangoExplorerLogicConfig) {
const { instanceId = 'tangoExplorer', tangoDB = [], useEnumLabels = true } = config;
const endpoints = useMemo(() => normalizeEndpoints(tangoDB), [tangoDB]);
const selectedEndpoint = endpoints[0] ?? '';
const multiEndpointMode = endpoints.length > 1;
let useApolloClientHook: unknown = null;
try {
useApolloClientHook = (Apollo as any).useApolloClient;
} catch {
useApolloClientHook = null;
}
const client = typeof useApolloClientHook === 'function' ? (useApolloClientHook as any)() : null;
// Refresh rate (seconds) – controlled via widgetDef.polls
const refresh = useWidgetRefreshRate(instanceId);
// 1. Query devices (incl. their latest state) on a polling interval
const {
data: devData,
loading: devicesLoading,
error: devicesError,
refetch: refetchDevices
} = useQuery<{ devices: DeviceInfo[] }>(OP_DEVICES, {
skip: multiEndpointMode,
variables: selectedEndpoint ? { endpoint: selectedEndpoint } : undefined,
pollInterval: refresh * 1000,
fetchPolicy: 'network-only'
});
const [multiDevData, setMultiDevData] = useState<{ devices: DeviceInfo[] }>({ devices: [] });
const [multiDevicesLoading, setMultiDevicesLoading] = useState(false);
const [multiDevicesError, setMultiDevicesError] = useState<unknown>(null);
const [deviceEndpointByName, setDeviceEndpointByName] = useState<Record<string, string>>({});
const fetchMultiDevices = useMemo(
() => async () => {
Iif (!client) return;
setMultiDevicesLoading(true);
setMultiDevicesError(null);
try {
const responses = await Promise.all(
endpoints.map(async (endpoint) => {
const res = (await client.query({
query: OP_DEVICES,
variables: endpoint ? { endpoint } : undefined,
fetchPolicy: 'network-only'
})) as { data?: { devices?: DeviceInfo[] } };
return { endpoint, devices: Array.isArray(res.data?.devices) ? res.data.devices : [] };
})
);
const merged: DeviceInfo[] = [];
const endpointMap: Record<string, string> = {};
const seen = new Set<string>();
for (const response of responses) {
for (const device of response.devices) {
const key = String(device?.name ?? '').trim();
Iif (!key || seen.has(key)) continue;
seen.add(key);
merged.push(device);
endpointMap[key] = response.endpoint;
}
}
setDeviceEndpointByName(endpointMap);
setMultiDevData({ devices: merged });
} catch (error) {
setMultiDevicesError(error);
} finally {
setMultiDevicesLoading(false);
}
},
[client, endpoints]
);
useEffect(() => {
if (!multiEndpointMode) return;
let alive = true;
const run = async () => {
Iif (!alive) return;
await fetchMultiDevices();
};
void run();
const intervalMs = Math.max(0, Number(refresh) || 0) * 1000;
Iif (intervalMs <= 0) {
return () => {
alive = false;
};
}
const timer = setInterval(() => {
void run();
}, intervalMs);
return () => {
alive = false;
clearInterval(timer);
};
}, [multiEndpointMode, fetchMultiDevices, refresh]);
const activeDevData = multiEndpointMode ? multiDevData : devData;
const activeDevicesLoading = multiEndpointMode ? multiDevicesLoading : devicesLoading;
const activeDevicesError = multiEndpointMode ? multiDevicesError : devicesError;
const activeRefetchDevices = multiEndpointMode ? fetchMultiDevices : refetchDevices;
const devices: DeviceInfo[] = useMemo(
() => (activeDevData?.devices as DeviceInfo[] | undefined) ?? [],
[activeDevData]
);
const deviceNames = useMemo(() => devices.map((d) => d.name), [devices]);
const deviceNamesKey = useMemo(() => [...deviceNames].sort().join(','), [deviceNames]);
// Group devices by server to build the sunburst later
const byServer = useMemo(() => {
const m = new Map<string, DeviceInfo[]>();
for (const d of devices) {
const sid = d.server?.id ?? 'unknown';
if (!m.has(sid)) m.set(sid, []);
m.get(sid)!.push(d);
}
return m;
}, [devices]);
// 2. Fetch enum-label metadata (optional)
const fullNames = useMemo(() => deviceNames.map((n) => `${n}/state`), [deviceNames]);
const { data: singleMetaData, refetch: refetchSingleMeta } = useQuery(OP_ATTRIBUTES, {
skip: multiEndpointMode || !useEnumLabels || fullNames.length === 0,
variables: selectedEndpoint ? { fullNames, endpoint: selectedEndpoint } : { fullNames },
fetchPolicy: 'network-only'
});
const [multiMetaData, setMultiMetaData] = useState<{ attributes: any[] }>({ attributes: [] });
const fetchMultiMeta = useMemo(
() => async () => {
Iif (!client || !useEnumLabels || deviceNames.length === 0) {
setMultiMetaData({ attributes: [] });
return;
}
const endpointBuckets = new Map<string, string[]>();
for (const name of deviceNames) {
const endpoint = deviceEndpointByName[name] ?? '';
const bucket = endpointBuckets.get(endpoint) ?? [];
bucket.push(`${name}/state`);
endpointBuckets.set(endpoint, bucket);
}
const responses = await Promise.all(
Array.from(endpointBuckets.entries()).map(async ([endpoint, scopedFullNames]) => {
const res = (await client.query({
query: OP_ATTRIBUTES,
variables: endpoint
? { fullNames: scopedFullNames, endpoint }
: { fullNames: scopedFullNames },
fetchPolicy: 'network-only'
})) as { data?: { attributes?: any[] } };
return Array.isArray(res.data?.attributes) ? res.data.attributes : [];
})
);
setMultiMetaData({ attributes: responses.flat() });
},
[client, useEnumLabels, deviceNames, deviceEndpointByName]
);
const activeMetaData = multiEndpointMode ? multiMetaData : singleMetaData;
const activeRefetchMeta = multiEndpointMode ? fetchMultiMeta : refetchSingleMeta;
useEffect(() => {
if (useEnumLabels && fullNames.length) activeRefetchMeta?.();
}, [useEnumLabels, activeRefetchMeta, deviceNamesKey, fullNames.length]);
const enumMap = useMemo(() => {
const out: Record<string, string[]> = {};
activeMetaData?.attributes?.forEach((a: any) => {
Eif (Array.isArray(a.enumLabels)) {
out[`${a.device}|${a.name}`] = a.enumLabels;
}
});
return out;
}, [activeMetaData]);
// 3. Build a { deviceName → displayState } map from polled data
const [deviceStates, setDeviceStates] = useState<Record<string, string>>({});
const prevDeviceKey = useRef(deviceNamesKey);
// Reset states if device list changed
useEffect(() => {
if (prevDeviceKey.current !== deviceNamesKey) {
prevDeviceKey.current = deviceNamesKey;
setDeviceStates({});
}
}, [deviceNamesKey]);
useEffect(() => {
const next: Record<string, string> = {};
for (const d of devices) {
const raw = d.state ?? 'unknown';
const enumKey = `${d.name}|state`;
let display: string | undefined;
Eif (useEnumLabels) {
let idx: number | undefined;
if (typeof raw === 'number') idx = raw;
else if (typeof raw === 'string' && /^\d+$/.test(raw)) idx = parseInt(raw, 10);
const labels = enumMap[enumKey];
if (labels && idx != null && labels[idx] != null) display = labels[idx];
}
if (!display) display = String(raw);
next[d.name] = display;
}
/* avoid infinite re‑render loops – update state only when it changed */
setDeviceStates((prev) => (shallowEqual(prev, next) ? prev : next));
}, [devices, enumMap, useEnumLabels]);
return {
devices,
deviceNames,
byServer,
deviceStates,
devicesLoading: activeDevicesLoading,
devicesError: activeDevicesError,
refetchDevices: activeRefetchDevices,
enumMap,
useEnumLabels,
refetchMeta: activeRefetchMeta
} as const;
}
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