import { Link, useNavigate } from 'react-router-dom';
import { extractApiError } from '@/api/client';
import { useAuth } from '@/hooks/useAuth';
import { useEngagementSimulations } from '@/hooks/useSimulations';
import { LoadingState } from './LoadingState';
import { ErrorState } from './ErrorState';
import { EmptyState } from './EmptyState';
import { SimulationStatusBadge } from './SimulationStatusBadge';

interface SimulationListProps {
  engagementId: number;
}

function formatDate(value: string | null): string {
  if (!value) return '—';
  return value.replace('T', ' ').slice(0, 16);
}

export function SimulationList({ engagementId }: SimulationListProps): JSX.Element {
  const { data, isLoading, isError, error, refetch } = useEngagementSimulations(engagementId);
  const { canEditEngagements } = useAuth();
  const navigate = useNavigate();

  if (isLoading) return <LoadingState label="Loading simulations…" />;

  if (isError) {
    return (
      <ErrorState
        message={extractApiError(error, 'Could not load simulations')}
        onRetry={() => refetch()}
      />
    );
  }

  if (!data || data.length === 0) {
    return (
      <EmptyState
        title="No simulations yet"
        description="Create the first simulation to start tracking red team tests."
        action={
          canEditEngagements ? (
            <Link
              to={`/engagements/${engagementId}/simulations/new`}
              className="btn-primary"
              data-testid="new-simulation-btn"
            >
              New simulation
            </Link>
          ) : undefined
        }
      />
    );
  }

  return (
    <div className="flex flex-col gap-md">
      <div className="flex items-center justify-between">
        <h2 className="text-[24px] font-medium text-ink">Simulations</h2>
        {canEditEngagements ? (
          <Link
            to={`/engagements/${engagementId}/simulations/new`}
            className="btn-primary"
            data-testid="new-simulation-btn"
          >
            New simulation
          </Link>
        ) : null}
      </div>

      <div className="card-product overflow-hidden p-0">
        <table className="w-full text-left">
          <thead className="bg-cloud border-b border-hairline">
            <tr className="text-[12px] uppercase tracking-[0.5px] text-graphite">
              <th className="px-xl py-md">Name</th>
              <th className="px-xl py-md">MITRE</th>
              <th className="px-xl py-md">Status</th>
              <th className="px-xl py-md">Executed at</th>
            </tr>
          </thead>
          <tbody>
            {data.map((sim) => (
              <tr
                key={sim.id}
                className="border-b border-hairline last:border-0 hover:bg-cloud cursor-pointer"
                onClick={() =>
                  navigate(`/engagements/${engagementId}/simulations/${sim.id}/edit`)
                }
              >
                <td className="px-xl py-md">
                  <Link
                    to={`/engagements/${engagementId}/simulations/${sim.id}/edit`}
                    className="text-ink font-medium hover:underline"
                    onClick={(e) => e.stopPropagation()}
                  >
                    {sim.name}
                  </Link>
                </td>
                <td className="px-xl py-md text-charcoal text-[14px]">
                  {(() => {
                    const items = [
                      ...(sim.tactics ?? []).map((t) => t.id),
                      ...sim.techniques.map((t) => t.id),
                    ];
                    if (items.length === 0) return '—';
                    if (items.length === 1) return items[0];
                    return `${items[0]} +${items.length - 1}`;
                  })()}
                </td>
                <td className="px-xl py-md">
                  <SimulationStatusBadge status={sim.status} />
                </td>
                <td className="px-xl py-md text-charcoal text-[14px]">
                  {formatDate(sim.executed_at)}
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  );
}