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import { useState } from "react";
import {
Card,
CardContent,
CardHeader,
CardTitle,
} from "../../../components/ui/card";
import { EmptyState } from "../../../components/ui/empty-state";
import { Input } from "../../../components/ui/input";
import { PageHeader } from "../../../components/ui/page-header";
import { useRrmReferralFunnel } from "../../../hooks/queries/useRrmQueries";
import type { FunnelStep } from "../../../lib/api/admin/rrm";
/**
* FR-I-3 — the funnel diagnostic, as a first-class admin view.
*
* created → forwarded → link_opened → engaged → verified → contacted → quoted
* → converted, over `referral_events` rather than over `referrals.status`: a
* funnel step means "how many ever got this far", and a row's current status
* has forgotten everywhere it has been.
*
* THE DROP BETWEEN STEPS IS THE POINT. A column chart of eight numbers tells an
* operator nothing they could not get from a table; what they came for is which
* gap is the big one, so every row carries the percentage that survived it and
* the worst is called out by name.
*/
const STEP_LABEL: Record<string, string> = {
created: "Added by a partner",
forwarded: "Sent to the homeowner",
opened: "Homeowner opened the link",
engaged: "Homeowner messaged us",
verified: "We confirmed them",
contacted: "We got in touch",
quoted: "Quoted",
converted: "Went ahead",
};
/** What survived each step, and what it cost. */
function withDrop(steps: FunnelStep[]) {
return steps.map((step, i) => {
const previous = i === 0 ? null : steps[i - 1].referrals;
const lost = previous === null ? 0 : previous - step.referrals;
return {
...step,
previous,
lost,
// Of the FIRST step, so every bar is comparable at a glance.
shareOfTop:
steps[0].referrals > 0 ? step.referrals / steps[0].referrals : 0,
// Of the step before it, which is the number that names the problem.
survival: previous && previous > 0 ? step.referrals / previous : null,
};
});
}
function FunnelRows({ steps }: { steps: FunnelStep[] }) {
const rows = withDrop(steps);
// The biggest single loss, ignoring the first step, which has nothing to
// drop from. Named rather than left for the reader to spot.
const worst = rows
.slice(1)
.reduce<(typeof rows)[number] | null>(
(acc, row) => (acc === null || row.lost > acc.lost ? row : acc),
null,
);
return (
<ul className="divide-y divide-border-default">
{rows.map((row) => (
<li key={row.key} className="px-4 py-3" data-testid="funnel-step">
<div className="flex items-baseline justify-between gap-3">
<p className="text-sm font-medium text-foreground-default">
{STEP_LABEL[row.key] ?? row.key}
</p>
<p
className="text-sm font-semibold tabular-nums"
data-testid={`funnel-count-${row.key}`}
>
{row.referrals.toLocaleString("en-IN")}
</p>
</div>
<div className="mt-2 h-2 overflow-hidden rounded-full bg-background-muted">
<div
className="h-full rounded-full bg-primary-500"
style={{ width: `${Math.round(row.shareOfTop * 100)}%` }}
/>
</div>
{row.survival !== null && (
<p
className="mt-1 text-xs text-foreground-muted"
data-testid={`funnel-drop-${row.key}`}
>
{Math.round(row.survival * 100)}% of the step before
{row.lost > 0 ? ` · ${row.lost} lost here` : ""}
{worst?.key === row.key && row.lost > 0 ? " · biggest drop" : ""}
</p>
)}
</li>
))}
</ul>
);
}
export function ReferralFunnelPage() {
const [partnerId, setPartnerId] = useState("");
const { data, isLoading, error } = useRrmReferralFunnel(
partnerId.trim() ? { partnerId: partnerId.trim() } : {},
);
const funnel = data?.data;
return (
<div className="space-y-6" data-testid="rrm-funnel-page">
<PageHeader
title="Referral funnel"
description="Where referrals stop. Counted from events, so a referral that reached a step still counts even if it later went backwards."
/>
<Card>
<CardHeader className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
<CardTitle className="text-lg">
{partnerId.trim() ? "One partner" : "Everyone"}
</CardTitle>
<Input
value={partnerId}
placeholder="Filter by partner id"
data-testid="rrm-funnel-partner"
className="sm:max-w-xs"
onChange={(e) => setPartnerId(e.target.value)}
/>
</CardHeader>
<CardContent className="p-0">
{error ? (
<div
data-testid="rrm-funnel-error"
className="flex items-start gap-2 p-6 text-sm text-error"
>
<AlertTriangle className="h-4 w-4 shrink-0" aria-hidden="true" />
<span>Could not load the funnel. Refresh to try again.</span>
</div>
) : isLoading ? (
<div className="space-y-3 p-4" data-testid="rrm-funnel-skeleton">
{["a", "b", "c", "d"].map((k) => (
<div
key={k}
className="h-10 animate-pulse rounded bg-background-muted"
/>
))}
</div>
) : !funnel || funnel.steps[0]?.referrals === 0 ? (
<div className="px-4 py-12">
<EmptyState
icon={TrendingDown}
title="No referrals in this window"
description={
partnerId.trim()
? "This partner has not added a referral yet, or the id does not match one."
: "Nobody has added a referral yet. The funnel fills in as they do."
}
/>
</div>
) : (
<FunnelRows steps={funnel.steps} />
)}
</CardContent>
</Card>
{funnel && funnel.byTier.length > 0 && (
<Card>
<CardHeader>
<CardTitle className="text-lg">By tier</CardTitle>
{/* Not a footnote — a chart covering 12 of 400 partners looks
like a chart of the programme unless it says so, and tier
exists only on partners we recruited. */}
<p
className="text-sm text-foreground-muted"
data-testid="rrm-funnel-coverage"
>
Covers {funnel.tierCoverage.recruitedPartners} of{" "}
{funnel.tierCoverage.totalPartners} partners — only the ones we
recruited have a tier. Self-registered partners are in the figures
above and not below.
</p>
</CardHeader>
<CardContent className="space-y-6 p-0">
{funnel.byTier.map((tier) => (
<div key={tier.tier ?? "none"} data-testid="rrm-funnel-tier">
<p className="px-4 pt-4 text-sm font-medium text-foreground-muted">
Tier {tier.tier ?? "—"}
</p>
<FunnelRows steps={tier.steps} />
</div>
))}
</CardContent>
</Card>
)}
</div>
);
}
export default ReferralFunnelPage;
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