'use client';

import { useQuery } from '@tanstack/react-query';
import { apiFetch } from '../../../lib/api';
import type { Opportunity } from '../../../lib/api';
import { useSession } from '../../../components/session-provider';

function probBadge(p: string | null): string {
  const n = Number(p ?? 0);
  if (n >= 0.7) return 'bg-signal-ok text-white';
  if (n >= 0.4) return 'bg-signal-warn text-white';
  return 'bg-paper-sunken text-ink-faint';
}

function fmtCurrency(minor: string | null): string {
  if (!minor) return '—';
  return new Intl.NumberFormat('ro-RO', { maximumFractionDigits: 0 }).format(Number(minor) / 100);
}

export default function OpportunitiesPage() {
  const { activeTenant } = useSession();
  const tenantId = activeTenant?.tenantId ?? '';

  const { data: opportunities = [], isLoading } = useQuery({
    queryKey: ['opportunities', tenantId],
    queryFn: () => apiFetch<Opportunity[]>('/v1/opportunities', { tenantId }),
    enabled: Boolean(tenantId),
    staleTime: 30_000,
  });

  const now = new Date();
  const expiringSoon = opportunities.filter(
    (o) => o.expiresAt && new Date(o.expiresAt) < new Date(now.getTime() + 7 * 86400_000),
  );
  const highProb = opportunities.filter((o) => Number(o.probability ?? 0) >= 0.7);

  return (
    <div className="max-w-5xl space-y-6">
      <div>
        <h1 className="font-display text-2xl font-semibold text-ink">Opportunity Inbox</h1>
        <p className="mt-1 text-sm text-ink-faint">
          Oportunități detectate —{' '}
          {isLoading ? '…' : `${opportunities.length} active`}
        </p>
      </div>

      {isLoading ? (
        <p className="text-sm text-ink-faint">Se încarcă…</p>
      ) : (
        <>
          {/* Quick stats */}
          <div className="grid grid-cols-3 gap-4">
            <div className="card p-4">
              <p className="text-xs text-ink-faint">Total</p>
              <p className="mt-1 font-display text-2xl font-semibold text-ink">{opportunities.length}</p>
            </div>
            <div className="card p-4">
              <p className="text-xs text-ink-faint">Probabilitate ridicată</p>
              <p className="mt-1 font-display text-2xl font-semibold text-signal-ok">{highProb.length}</p>
            </div>
            <div className={`card p-4 ${expiringSoon.length > 0 ? 'border-l-2 border-l-signal-warn' : ''}`}>
              <p className="text-xs text-ink-faint">Expiră în 7 zile</p>
              <p className={`mt-1 font-display text-2xl font-semibold ${expiringSoon.length > 0 ? 'text-signal-warn' : 'text-ink'}`}>
                {expiringSoon.length}
              </p>
            </div>
          </div>

          {opportunities.length === 0 ? (
            <div className="card p-10 text-center">
              <p className="text-sm font-medium text-ink">Nicio oportunitate detectată</p>
              <p className="mt-1 text-xs text-ink-faint">
                Oportunitățile sunt detectate automat din activitate și research.
              </p>
            </div>
          ) : (
            <div className="card overflow-hidden">
              <div className="overflow-x-auto">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b border-paper-sunken text-left">
                      <th className="px-4 py-3 text-xs font-medium text-ink-faint">Sursă</th>
                      <th className="px-4 py-3 text-xs font-medium text-ink-faint">Entitate</th>
                      <th className="px-4 py-3 text-xs font-medium text-ink-faint">Probabilitate</th>
                      <th className="px-4 py-3 text-right text-xs font-medium text-ink-faint">Valoare estimată</th>
                      <th className="px-4 py-3 text-xs font-medium text-ink-faint">Expirare</th>
                      <th className="px-4 py-3 text-xs font-medium text-ink-faint">Acțiune</th>
                    </tr>
                  </thead>
                  <tbody>
                    {opportunities
                      .sort((a, b) => Number(b.probability ?? 0) - Number(a.probability ?? 0))
                      .map((o) => {
                        const prob = Number(o.probability ?? 0);
                        const isExpiring = o.expiresAt && new Date(o.expiresAt) < new Date(now.getTime() + 7 * 86400_000);
                        return (
                          <tr key={o.id} className={`border-b border-paper-sunken last:border-0 hover:bg-paper-sunken/40 ${isExpiring ? 'bg-signal-warn/5' : ''}`}>
                            <td className="px-4 py-2.5 text-sm text-ink capitalize">{o.source.replace(/_/g, ' ')}</td>
                            <td className="px-4 py-2.5 text-sm text-ink-faint">
                              {o.entityType ? (
                                <span className="rounded bg-paper-sunken px-1.5 py-0.5 font-mono text-[10px]">{o.entityType}</span>
                              ) : '—'}
                            </td>
                            <td className="px-4 py-2.5">
                              <span className={`rounded-full px-2 py-0.5 text-[10px] font-semibold ${probBadge(o.probability)}`}>
                                {prob > 0 ? `${Math.round(prob * 100)}%` : '—'}
                              </span>
                            </td>
                            <td className="px-4 py-2.5 text-right font-mono text-xs text-ink">
                              {o.valueRangeMin || o.valueRangeMax ? (
                                `${fmtCurrency(o.valueRangeMin)} – ${fmtCurrency(o.valueRangeMax)}`
                              ) : '—'}
                            </td>
                            <td className={`px-4 py-2.5 text-xs ${isExpiring ? 'font-semibold text-signal-warn' : 'text-ink-faint'}`}>
                              {o.expiresAt ? new Date(o.expiresAt).toLocaleDateString('ro-RO') : '—'}
                            </td>
                            <td className="px-4 py-2.5 text-xs text-ink">
                              {o.nextAction ?? '—'}
                            </td>
                          </tr>
                        );
                      })}
                  </tbody>
                </table>
              </div>
            </div>
          )}
        </>
      )}
    </div>
  );
}