import { Suspense } from "react";
import { getDashboardStats } from "@/lib/dashboard-queries";
import { FollowUpWidget } from "@/components/admin/dashboard/FollowUpWidget";
import {
  getAnalyticsByYear,
  getMonthlyCollected,
  getAvailableYears,
  getTimeByClient,
  getTotalTrackedHours,
} from "@/lib/analytics-queries";
import { YearSelector, MonthlyChart } from "@/components/admin/YearSelector";
import { Users, FolderOpen, Euro, Clock } from "lucide-react";

export const revalidate = 0;

function KpiCard({
  label,
  value,
  sub,
  icon: Icon,
  color,
}: {
  label: string;
  value: string | number;
  sub?: string;
  icon: React.ElementType;
  color: string;
}) {
  return (
    <div className="bg-white rounded-xl border border-gray-200 p-5 flex items-start gap-4">
      <div className={`p-2 rounded-lg ${color}`}>
        <Icon size={20} strokeWidth={1.8} className="text-white" />
      </div>
      <div>
        <p className="text-xs text-gray-500 font-medium uppercase tracking-wide">{label}</p>
        <p className="text-2xl font-bold text-gray-900 mt-0.5">{value}</p>
        {sub && <p className="text-xs text-gray-400 mt-0.5">{sub}</p>}
      </div>
    </div>
  );
}

function MetricCard({
  label,
  value,
  sub,
  accent,
}: {
  label: string;
  value: string;
  sub?: string;
  accent?: boolean;
}) {
  return (
    <div
      className={`rounded-xl border p-5 ${
        accent ? "bg-[#1A463C] border-[#1A463C] text-white" : "bg-white border-[#e5e7eb]"
      }`}
    >
      <p
        className={`text-xs font-bold uppercase tracking-wider mb-2 ${
          accent ? "text-white/60" : "text-[#71717a]"
        }`}
      >
        {label}
      </p>
      <p
        className={`text-2xl font-bold tracking-tight ${
          accent ? "text-white" : "text-[#1a1a1a]"
        }`}
      >
        {value}
      </p>
      {sub && (
        <p className={`text-xs mt-1 ${accent ? "text-white/60" : "text-[#71717a]"}`}>{sub}</p>
      )}
    </div>
  );
}

const ACTIVITY_ICONS: Record<string, string> = {
  nuovo_cliente: "👤",
  nuovo_progetto: "📁",
  deliverable_approvato: "✅",
  timer_stoppato: "⏱",
};

function fmt(ts: Date) {
  return new Intl.DateTimeFormat("it-IT", {
    day: "2-digit",
    month: "short",
    hour: "2-digit",
    minute: "2-digit",
  }).format(new Date(ts));
}

function fmtEur(n: number) {
  return n.toLocaleString("it-IT", {
    style: "currency",
    currency: "EUR",
    minimumFractionDigits: 2,
  });
}

function fmtSeconds(s: number): string {
  const h = Math.floor(s / 3600);
  const m = Math.floor((s % 3600) / 60);
  if (h > 0) return `${h}h ${m}m`;
  return `${m}m`;
}

export default async function AdminDashboard({
  searchParams,
}: {
  searchParams: Promise<{ year?: string }>;
}) {
  const { year: yearParam } = await searchParams;
  const year = parseInt(yearParam ?? "") || new Date().getFullYear();

  const { kpi, activity } = await getDashboardStats();

  const [data, monthly, availableYears, timeByClient, totalHours] = await Promise.all([
    getAnalyticsByYear(year),
    getMonthlyCollected(year),
    getAvailableYears(),
    getTimeByClient(year),
    getTotalTrackedHours(year),
  ]);

  const collectedPct =
    data.contracted > 0 ? Math.round((data.collected / data.contracted) * 100) : 0;

  const maxClientSeconds = timeByClient[0]?.totalSeconds ?? 1;

  return (
    <div className="max-w-5xl">
      <h1 className="text-2xl font-bold text-gray-900 mb-6">Dashboard</h1>

      {/* Follow-up Widget */}
      <div className="mb-8">
        <Suspense fallback={<div className="animate-pulse h-40 bg-gray-200 rounded-lg" />}>
          <FollowUpWidget />
        </Suspense>
      </div>

      {/* KPI cards */}
      <div className="grid grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
        <KpiCard
          label="Clienti attivi"
          value={kpi.clientiAttivi}
          icon={Users}
          color="bg-[#1A463C]"
        />
        <KpiCard
          label="Revenue totale"
          value={fmtEur(parseFloat(kpi.revenueTotale))}
          sub="progetti non archiviati"
          icon={Euro}
          color="bg-emerald-600"
        />
        <KpiCard
          label="Progetti in corso"
          value={kpi.progettiInCorso}
          icon={FolderOpen}
          color="bg-blue-600"
        />
        <KpiCard
          label="Pagamenti in sospeso"
          value={fmtEur(parseFloat(kpi.pagamentiInSospeso))}
          sub="da_saldare + inviata"
          icon={Clock}
          color="bg-amber-500"
        />
      </div>

      {/* Activity feed */}
      <div className="bg-white rounded-xl border border-gray-200">
        <div className="px-5 py-4 border-b border-gray-100">
          <h2 className="text-sm font-semibold text-gray-700">Attività recente</h2>
        </div>
        {activity.length === 0 ? (
          <p className="px-5 py-8 text-sm text-gray-400 text-center">Nessuna attività recente</p>
        ) : (
          <ul className="divide-y divide-gray-50">
            {activity.map((item, i) => (
              <li key={i} className="px-5 py-3 flex items-center justify-between gap-4">
                <div className="flex items-center gap-3">
                  <span className="text-base">{ACTIVITY_ICONS[item.type]}</span>
                  <div>
                    <p className="text-sm font-medium text-gray-800">{item.label}</p>
                    <p className="text-xs text-gray-500">{item.detail}</p>
                  </div>
                </div>
                <span className="text-xs text-gray-400 shrink-0">{fmt(item.timestamp)}</span>
              </li>
            ))}
          </ul>
        )}
      </div>

      {/* ── SEZIONE STATISTICHE ANNUALI ── */}
      <div className="mt-10 space-y-10">
        <div className="flex items-center justify-between">
          <div>
            <h2 className="text-xl font-bold text-gray-900">Statistiche</h2>
            <p className="text-sm text-gray-400 mt-0.5">Panoramica per anno</p>
          </div>
          <YearSelector currentYear={year} availableYears={availableYears} />
        </div>

        {/* Sezione economica */}
        <div className="space-y-4">
          <h3 className="text-sm font-bold text-[#71717a] uppercase tracking-wider">Fatturato</h3>
          <div className="grid grid-cols-2 lg:grid-cols-4 gap-4">
            <MetricCard
              label="Contrattualizzato"
              value={fmtEur(data.contracted)}
              sub={`${data.clientsAcquired} client${data.clientsAcquired === 1 ? "e" : "i"}`}
              accent
            />
            <MetricCard
              label="Incassato"
              value={fmtEur(data.collected)}
              sub={`${collectedPct}% del contrattualizzato`}
            />
            <MetricCard
              label="Da incassare"
              value={fmtEur(data.pending)}
              sub="Tutti gli anni"
            />
            <MetricCard
              label="Clienti acquisiti"
              value={String(data.clientsAcquired)}
              sub={`Anno ${year}`}
            />
          </div>
          <MonthlyChart data={monthly} year={year} />
          {data.contracted === 0 && (
            <p className="text-sm text-[#71717a] italic text-center py-2">
              Nessun cliente registrato nel {year}.
            </p>
          )}
        </div>

        {/* Sezione time tracking */}
        <div className="space-y-4">
          <h3 className="text-sm font-bold text-[#71717a] uppercase tracking-wider">
            Tempo tracciato
          </h3>
          <div className="grid grid-cols-2 lg:grid-cols-4 gap-4">
            <MetricCard label="Ore totali" value={`${totalHours}h`} sub={`Anno ${year}`} accent />
          </div>

          {timeByClient.length === 0 ? (
            <div className="bg-white rounded-xl border border-[#e5e7eb] p-8 text-center">
              <p className="text-sm text-[#71717a] italic">
                Nessuna sessione registrata nel {year}. Usa il timer &#9654; nella lista clienti per
                iniziare.
              </p>
            </div>
          ) : (
            <div className="bg-white rounded-xl border border-[#e5e7eb] p-6 space-y-4">
              <h3 className="text-sm font-bold text-[#1a1a1a]">Ore per cliente — {year}</h3>
              <div className="space-y-3">
                {timeByClient.map((row) => {
                  const pct = Math.round((row.totalSeconds / maxClientSeconds) * 100);
                  return (
                    <div key={row.clientId}>
                      <div className="flex items-center justify-between mb-1">
                        <span className="text-sm font-medium text-[#1a1a1a]">
                          {row.clientName}
                        </span>
                        <span className="text-sm tabular-nums text-[#71717a]">
                          {fmtSeconds(row.totalSeconds)}
                        </span>
                      </div>
                      <div className="h-2 rounded-full bg-[#f4f4f5] overflow-hidden">
                        <div
                          className="h-full rounded-full bg-[#1A463C] transition-all"
                          style={{ width: `${pct}%` }}
                        />
                      </div>
                    </div>
                  );
                })}
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}
