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// src/hooks/useInitialHistory.ts
// --------------------------------------------------------------------
import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
import type { ApolloClient, NormalizedCacheObject } from '@apollo/client';
import { OP } from '../graphql/operations';
import { type EndpointByAttribute, type HdbByEndpoint } from '../timeline/currentValueQueries';
import { canonicalAttr as canonicalAttrShared } from '../utils/utils';
export type Pt = { t: number; v: any };
export type HistStatus = 'idle' | 'loading' | 'refreshing' | 'succeeded' | 'failed';
function buildHdbGroups(
attrs: string[],
endpointByAttribute: EndpointByAttribute,
hdbByEndpoint: HdbByEndpoint
): Map<number, string[]> {
const groups = new Map<number, string[]>();
for (const attr of attrs) {
const key = canonicalAttrShared(attr).toLowerCase();
const ep = endpointByAttribute[key] ?? '';
const hdb = ep && ep in hdbByEndpoint ? hdbByEndpoint[ep] : 0;
if (!groups.has(hdb)) groups.set(hdb, []);
groups.get(hdb)!.push(attr);
}
return groups;
}
/* ------------------------------------------------------------------ */
/* Helper – normalize transport prefixes to “device/attr”. */
/* Keeps history and live-stream keys identical. */
/* ------------------------------------------------------------------ */
function canonicalAttr(name: string): string {
return canonicalAttrShared(name).toLowerCase();
}
/**
* Fetch the complete (possibly downsampled) history inside `[start, end]`.
*
* • Initial mount uses a **hard** load (shows "Loading..." if empty).
* • Later changes (range, attributes, maxPoints/downsample, manual refresh) use a **soft**
* refresh — keeps current data visible while new data is fetched, then swaps.
* • Each successful fetch **overwrites** the previous data so live packets
* start populating a fresh canvas (no mixing of old/new attrs).
*/
export function useInitialHistory(
client: ApolloClient<NormalizedCacheObject> | null,
attrs: string[],
maxPoints: number,
start: number,
end: number,
rangeMs: number, // <- presetMs from useEffectiveTimeRange
downsample: 'minmax' | 'avg' | 'lttb' | 'none',
endpointByAttribute: EndpointByAttribute = {},
hdbByEndpoint: HdbByEndpoint = {},
paused = false
) {
const [dataMap, setDataMap] = useState<Record<string, Pt[]>>({});
const [status, setStatus] = useState<HistStatus>('idle');
const [error, setError] = useState<string | null>(null);
// Stable signature of the attribute list (order/dupes ignored)
const attrsSig = useMemo(() => {
const cleaned = (attrs ?? []).filter(Boolean).map((a) => a.trim());
const uniqueSorted = Array.from(new Set(cleaned)).sort();
return JSON.stringify(uniqueSorted);
}, [attrs]);
// Stable signature of hdb routing — changes when endpoint sources resolve
const hdbSig = useMemo(() => JSON.stringify(hdbByEndpoint), [hdbByEndpoint]);
// Prevent stale responses racing in: bump on every fetch, read the latest value via ref
const reqTokenRef = useRef(0);
// Tracks whether the hdbSig effect has already run once (to skip the initial mount fire)
const hdbSigSeenOnce = useRef(false);
/* ----------------------------- fetch ----------------------------- */
const fetchHistory = useCallback(
async (s: number, e: number, mode: 'hard' | 'soft') => {
Iif (paused) return;
Iif (!client) return;
const softReset = () => {
setDataMap({});
setStatus('succeeded');
setError(null);
};
// If no attributes, just reset and mark as succeeded
if (!attrs || attrs.length === 0) {
softReset();
return;
}
setStatus(mode === 'hard' ? 'loading' : 'refreshing');
setError(null);
const myToken = ++reqTokenRef.current;
const isStale = () => reqTokenRef.current !== myToken;
const toPts = (history: any[]): Pt[] =>
(history ?? [])
.map((h) => {
const rawTs = (h as any).timestamp;
const ts = typeof rawTs === 'number' ? rawTs : parseFloat(rawTs);
return { t: ts * 1000, v: (h as any).value };
})
.filter((p) => Number.isFinite(p.t))
.sort((a, b) => a.t - b.t)
.reduce<Pt[]>((acc, p) => {
// HDB++ can return duplicate timestamps (especially with minmax-like data).
// Keep the latest sample for a given timestamp to avoid zero-width artifacts.
if (acc.length > 0 && acc[acc.length - 1].t === p.t) {
acc[acc.length - 1] = p;
} else {
acc.push(p);
}
return acc;
}, []);
const runHdbQueries = async (requestedAttrs: string[]) => {
const hdbGroups = buildHdbGroups(requestedAttrs, endpointByAttribute, hdbByEndpoint);
const groupEntries = Array.from(hdbGroups.entries());
const results = await Promise.allSettled(
groupEntries.map(([hdb, groupAttrs]) =>
client.query({
query: OP,
variables: { attributes: groupAttrs, start: s, end: e, maxPoints, downsample, hdb },
fetchPolicy: 'network-only',
// Treat GraphQL errors (e.g. "attribute not found in HDB") as empty
// data rather than hard failures so other groups still render.
errorPolicy: 'ignore'
})
)
);
return { groupEntries, results };
};
const attemptPartialFetch = async () => {
const partialMap: Record<string, Pt[]> = {};
const requestedAttrs = attrs.map((name) => String(name ?? '').trim()).filter(Boolean);
if (requestedAttrs.length === 0) return null;
const { results } = await runHdbQueries(requestedAttrs);
results.forEach((res) => {
if (res.status !== 'fulfilled') return;
(res.value?.data?.hdbppHistory ?? []).forEach(
({ attribute, history }: { attribute: string; history: any[] }) => {
const key = canonicalAttr(attribute);
partialMap[key] = toPts(history ?? []);
}
);
});
if (Object.keys(partialMap).length === 0) {
return null;
}
return { map: partialMap };
};
try {
const requestedAttrs = attrs.map((name) => String(name ?? '').trim()).filter(Boolean);
Iif (requestedAttrs.length === 0) {
softReset();
return;
}
const { results } = await runHdbQueries(requestedAttrs);
if (isStale()) return;
const map: Record<string, Pt[]> = {};
results.forEach((res) => {
if (res.status !== 'fulfilled') return;
(res.value?.data?.hdbppHistory ?? []).forEach(
({ attribute, history }: { attribute: string; history: any[] }) => {
const short = canonicalAttr(attribute);
map[short] = toPts(history);
}
);
});
Iif (isStale()) return;
const allFailed = results.every((r) => r.status === 'rejected');
if (allFailed && Object.keys(map).length === 0) {
const firstRejection = results.find(
(r): r is PromiseRejectedResult => r.status === 'rejected'
);
setError(firstRejection?.reason?.message ?? 'Failed to load history');
setStatus('failed');
return;
}
setDataMap(map); // overwrite – start fresh
setStatus('succeeded');
setError(null);
} catch (e: any) {
if (isStale()) return;
const partial = await attemptPartialFetch();
if (partial) {
setDataMap(partial.map);
setStatus('succeeded');
setError(null);
} else {
setError(e?.message ?? String(e));
setStatus('failed');
}
}
},
[client, attrs, maxPoints, downsample, endpointByAttribute, hdbByEndpoint, paused]
);
/* ---------------------- initial mount fetch --------------------- */
useEffect(() => {
Iif (paused) return;
fetchHistory(start, end, 'hard');
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [paused]);
/* --- re-fetch when HDB routing changes (endpoint sources resolved) -- */
useEffect(() => {
Eif (!hdbSigSeenOnce.current) {
hdbSigSeenOnce.current = true;
return; // skip the initial mount fire; the paused effect handles it
}
if (paused) return;
fetchHistory(start, end, 'soft');
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [hdbSig]);
/* ------- re-fetch on window size change (soft) ------------------ */
useEffect(() => {
Iif (paused) return;
fetchHistory(start, end, 'soft');
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [rangeMs, paused]);
/* ------- re-fetch on attributes/maxPoints/downsample (soft) ----- */
useEffect(() => {
Iif (paused) return;
fetchHistory(start, end, 'soft');
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [attrsSig, maxPoints, downsample, paused]);
/* manual retry hook (soft) */
const refetch = useCallback(() => {
Iif (paused) return;
fetchHistory(start, end, 'soft');
}, [fetchHistory, start, end, paused]);
return { dataMap, setDataMap, status, error, refetch };
}
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