/**
 * @license
 * SPDX-License-Identifier: Apache-2.0
 */

import React from 'react';
import {
  Wallet,
  TrendingUp,
  Store,
  MapPin,
  Phone,
  AlertTriangle,
  Activity,
  Clock,
  ArrowUpRight,
} from 'lucide-react';
import { useFiestaLocationSummary, useFiestaTenantLocations, useFiestaRevenueSummary, useFiestaOrderSummary } from '../services/fiestaQueries';
import { FIESTA_TENANT_ID } from '../services/fiestaApi';

interface DashboardViewProps {
  searchQuery: string;
  isCoimbatoreView: boolean;
  /** Fiesta merchant tenant to scope live store summaries to. */
  tenantId?: number;
}

const ymd = (d: Date) =>
  `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;

const str = (v: unknown): string => (v == null ? '' : String(v));

export default function DashboardView({ searchQuery, tenantId = FIESTA_TENANT_ID }: DashboardViewProps) {
  // Live data — month-to-date order summary + tenant identity + store locations.
  const today = new Date();
  const monthStart = new Date(today);
  monthStart.setDate(today.getDate() - 30); // Last 30 days to include May orders
  const fromdate = ymd(monthStart);
  const todate = ymd(today);

  // All scoped to the signed-in merchant's tenant. Store locations come from the
  // Fiesta source (the single source of truth used across the app) — it's already
  // deduped and stripped of test rows, unlike the raw Hasura tenant-locations feed.
  const summaryQ = useFiestaOrderSummary(tenantId, fromdate, todate);
  const locationsQ = useFiestaTenantLocations(tenantId);
  const revenueQ = useFiestaRevenueSummary({ tenantid: tenantId, fromdate, todate });

  const s = summaryQ.data;
  const tenantName = s?.tenantname || `Tenant ${tenantId}`;

  // Revenue + profit come from the live invoice/financial insight. The endpoint
  // returns two distinct figures (revenue and profit); we surface both rather than
  // repeating one. When the tenant has no invoice records we show "—" instead of a
  // misleading ₹0.
  const insight = revenueQ.data as any;
  const money = (v: number | null) => (v == null ? '—' : `₹${Math.round(v).toLocaleString('en-IN')}`);
  const monthlyRevenue = insight ? Number(insight.grossrevenue || insight.overallrevenue || insight.revenue || 0) : null;
  const monthlyProfit = insight ? Number(insight.profit || insight.netrevenue || insight.margin || 0) : null;

  const locSummaryQ = useFiestaLocationSummary(tenantId, fromdate, todate);
  const summaries = locSummaryQ.data ?? [];

  // Region fulfillment — live month-to-date delivered ÷ total orders for the tenant.
  const ordersTotal = s?.total ?? 0;
  const ordersDelivered = s?.delivered ?? 0;
  const regionFulfillmentPct = ordersTotal > 0 ? (ordersDelivered / ordersTotal) * 100 : null;

  const locations = (locationsQ.data ?? []).filter((loc) => {
    if (!searchQuery) return true;
    const q = searchQuery.toLowerCase();
    return (
      str(loc.locationname).toLowerCase().includes(q) ||
      str(loc.city).toLowerCase().includes(q) ||
      str(loc.suburb).toLowerCase().includes(q)
    );
  });

  // KPI cards — orders from getordersummary, profit from getinvoiceinsight.
  const totalStoresCount = locations.length;
  const activeStoresCount = locations.filter(l => str(l.status).toLowerCase() === 'active').length;
  const inactiveStoresCount = totalStoresCount - activeStoresCount;
  const activePct = totalStoresCount > 0 ? Math.round((activeStoresCount / totalStoresCount) * 100) : 0;
  const circumference = 251.2;
  const dashOffset = circumference - (circumference * activePct) / 100;

  const kpis = [
    {
      title: 'ACTIVE OUTLETS',
      display: `${activeStoresCount} / ${totalStoresCount}`,
      sub: `${activePct}% of the network is live`,
      icon: Store,
      bar: 'from-purple-500 to-indigo-500',
      chip: 'bg-purple-50 text-purple-650 ring-purple-100',
      loading: locationsQ.isLoading,
    },
    {
      title: 'REGION FULFILLMENT',
      display: regionFulfillmentPct == null ? '—' : `${regionFulfillmentPct.toFixed(1)}%`,
      sub: `${ordersDelivered.toLocaleString('en-IN')} of ${ordersTotal.toLocaleString('en-IN')} orders delivered`,
      icon: Activity,
      bar: 'from-indigo-500 to-sky-500',
      chip: 'bg-indigo-50 text-indigo-600 ring-indigo-100',
      loading: summaryQ.isLoading,
    },
    {
      title: 'MONTHLY REVENUE',
      display: money(monthlyRevenue),
      sub: 'Gross billed · month-to-date',
      icon: Wallet,
      bar: 'from-sky-500 to-cyan-500',
      chip: 'bg-sky-50 text-sky-600 ring-sky-100',
      loading: revenueQ.isLoading,
    },
    {
      title: 'MONTHLY PROFIT',
      display: money(monthlyProfit),
      sub: 'Net margin · month-to-date',
      icon: TrendingUp,
      bar: 'from-emerald-500 to-teal-500',
      chip: 'bg-emerald-50 text-emerald-600 ring-emerald-100',
      loading: revenueQ.isLoading,
    },
  ];

  const statusRows = [
    { label: 'Active Outlets', value: activeStoresCount, dot: 'bg-emerald-500' },
    { label: 'Inactive / Maintenance', value: inactiveStoresCount, dot: 'bg-zinc-400' },
  ];

  const loading = summaryQ.isLoading;
  const errored = summaryQ.isError;

  return (
    <div className="space-y-lg animate-in fade-in duration-500 relative">


      {/* Error hint */}
      {errored && (
        <div className="bg-rose-50 border border-rose-200 rounded-xl p-md flex items-start gap-sm text-xs text-rose-800">
          <AlertTriangle size={16} className="shrink-0 mt-0.5 text-rose-500" />
          <div>
            <p className="font-semibold">Couldn't reach the live API.</p>
            <p className="mt-0.5 text-rose-700">
              The <code>/hasura</code> dev proxy loads at server start — stop and re-run <code>npm run dev</code> so the
              secret and proxy are active.
            </p>
          </div>
        </div>
      )}

      {/* KPI cards — all live from getordersummary / getinvoiceinsight */}
      <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-3 sm:gap-4">
        {kpis.map((kpi) => {
          const Icon = kpi.icon;
          return (
            <div
              key={kpi.title}
              className="group relative flex items-center gap-3 overflow-hidden bg-white border border-slate-200/70 rounded-xl p-3 shadow-[0_1px_2px_rgba(16,24,40,0.04)] transition-all duration-300 hover:-translate-y-1 hover:border-purple-200 hover:shadow-[0_16px_36px_rgba(16,24,40,0.10)]"
            >
              {/* Gradient accent bar */}
              <span className={`absolute inset-y-0 left-0 w-1 bg-gradient-to-b ${kpi.bar}`} />
              
              <div className={`h-10 w-10 shrink-0 rounded-lg flex items-center justify-center ring-1 group-hover:scale-110 transition-transform duration-300 ml-1 ${kpi.chip}`}>
                <Icon size={18} />
              </div>
              
              <div className="flex-1 min-w-0 flex flex-col justify-center">
                <div className="flex items-center justify-between">
                  <p className="text-[9px] font-bold text-slate-400 tracking-widest uppercase font-sans truncate pr-2">
                    {kpi.title}
                  </p>
                  <ArrowUpRight size={12} className="text-slate-300 group-hover:text-purple-400 transition-colors shrink-0" />
                </div>
                <p className="font-sans font-extrabold text-lg leading-tight text-slate-900 tracking-tight mt-0.5 truncate">
                  {kpi.loading ? <span className="text-slate-300">…</span> : kpi.display}
                </p>
                <p className="text-[9px] text-slate-400 font-medium mt-0.5 leading-snug truncate">
                  {kpi.sub}
                </p>
              </div>
            </div>
          );
        })}
      </div>


    </div>
  );
}