Final MVP valid

app/api/analytics/pareto/route.ts

@@ -0,0 +1,123 @@
+import { NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+import { requireSession } from "@/lib/auth/requireSession";
+import { coerceDowntimeRange, rangeToStart } from "@/lib/analytics/downtimeRange";
+
+const bad = (status: number, error: string) =>
+  NextResponse.json({ ok: false, error }, { status });
+
+export async function GET(req: Request) {
+  // ✅ Session auth (cookie)
+  const session = await requireSession();
+  if (!session) return bad(401, "Unauthorized");
+  const orgId = session.orgId;
+
+  const url = new URL(req.url);
+
+  // ✅ Parse params INSIDE handler
+  const range = coerceDowntimeRange(url.searchParams.get("range"));
+  const start = rangeToStart(range);
+
+  const machineId = url.searchParams.get("machineId"); // optional
+  const kind = (url.searchParams.get("kind") || "downtime").toLowerCase();
+
+  if (kind !== "downtime" && kind !== "scrap") {
+    return bad(400, "Invalid kind (downtime|scrap)");
+  }
+
+  // ✅ If machineId provided, verify it belongs to this org
+  if (machineId) {
+    const m = await prisma.machine.findFirst({
+      where: { id: machineId, orgId },
+      select: { id: true },
+    });
+    if (!m) return bad(404, "Machine not found");
+  }
+
+  // ✅ Scope by orgId (+ machineId if provided)
+  const grouped = await prisma.reasonEntry.groupBy({
+    by: ["reasonCode", "reasonLabel"],
+    where: {
+      orgId,
+      ...(machineId ? { machineId } : {}),
+      kind,
+      capturedAt: { gte: start },
+    },
+    _sum: {
+      durationSeconds: true,
+      scrapQty: true,
+    },
+    _count: { _all: true },
+  });
+
+  const itemsRaw = grouped
+    .map((g) => {
+      const value =
+        kind === "downtime"
+          ? Math.round(((g._sum.durationSeconds ?? 0) / 60) * 10) / 10 // minutes, 1 decimal
+          : g._sum.scrapQty ?? 0;
+
+      return {
+        reasonCode: g.reasonCode,
+        reasonLabel: g.reasonLabel ?? g.reasonCode,
+        value,
+        count: g._count._all,
+      };
+    })
+    .filter((x) => x.value > 0);
+
+  itemsRaw.sort((a, b) => b.value - a.value);
+
+  const total = itemsRaw.reduce((acc, x) => acc + x.value, 0);
+
+  let cum = 0;
+  let threshold80Index: number | null = null;
+
+  const rows = itemsRaw.map((x, idx) => {
+    const pctOfTotal = total > 0 ? (x.value / total) * 100 : 0;
+    cum += x.value;
+    const cumulativePct = total > 0 ? (cum / total) * 100 : 0;
+
+    if (threshold80Index === null && cumulativePct >= 80) threshold80Index = idx;
+
+    return {
+      reasonCode: x.reasonCode,
+      reasonLabel: x.reasonLabel,
+      minutesLost: kind === "downtime" ? x.value : undefined,
+      scrapQty: kind === "scrap" ? x.value : undefined,
+      pctOfTotal,
+      cumulativePct,
+      count: x.count,
+    };
+  });
+
+  const top3 = rows.slice(0, 3);
+  const threshold80 =
+    threshold80Index === null
+      ? null
+      : {
+          index: threshold80Index,
+          reasonCode: rows[threshold80Index].reasonCode,
+          reasonLabel: rows[threshold80Index].reasonLabel,
+        };
+
+  return NextResponse.json({
+    ok: true,
+    orgId,
+    machineId: machineId ?? null,
+    kind,
+    range,       // ✅ now defined correctly
+    start,       // ✅ now defined correctly
+    totalMinutesLost: kind === "downtime" ? total : undefined,
+    totalScrap: kind === "scrap" ? total : undefined,
+    rows,
+    top3,
+    threshold80,
+    // (optional) keep old shape if anything else uses it:
+    items: itemsRaw.map((x, i) => ({
+      ...x,
+      cumPct: rows[i]?.cumulativePct ?? 0,
+    })),
+    total,
+  });
+}