import { createMemo, createResource, createSignal, For, Show } from 'solid-js';
import AdminShell from '~/components/AdminShell';

const API = '/api/gateway';

type ApplicationRow = {
  id: string;
  requirementId: string;
  professionalId: string;
  status: string;
  quote?: number;
  message?: string;
  createdAt?: string;
};

type Requirement = {
  id: string;
  title?: string;
  location?: string;
  profession?: string;
  customerId?: string;
};

type ApplicationsPayload = {
  applications: ApplicationRow[];
  requirements: Requirement[];
};

async function fetchApplications(): Promise<ApplicationsPayload> {
  const [appRes, reqRes] = await Promise.all([
    fetch(`${API}/api/responses`),
    fetch(`${API}/api/requirements`),
  ]);

  const appData = appRes.ok ? await appRes.json() : {};
  const reqData = reqRes.ok ? await reqRes.json() : {};

  return {
    applications: appData?.responses || appData?.applications || [],
    requirements: reqData?.requirements || [],
  };
}

export default function ApplicationsPage() {
  const [refreshToken, setRefreshToken] = createSignal(0);
  const [busyId, setBusyId] = createSignal('');
  const [error, setError] = createSignal('');

  const [payload] = createResource(refreshToken, fetchApplications);
  const applications = createMemo(() => payload()?.applications || []);
  const requirements = createMemo(() => payload()?.requirements || []);

  async function updateStatus(id: string, status: string) {
    setBusyId(id);
    setError('');
    try {
      const res = await fetch(`${API}/api/responses/${id}/status`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status }),
      });
      if (!res.ok) {
        const message = await res.text();
        throw new Error(message || 'Failed to update status');
      }
      setRefreshToken((value) => value + 1);
    } catch (nextError: any) {
      setError(nextError?.message || 'Failed to update status');
    } finally {
      setBusyId('');
    }
  }

  function requirementFor(id: string): Requirement | undefined {
    return requirements().find((item) => item.id === id);
  }

  function statusBadge(status: string) {
    if (status === 'ACCEPTED') return 'bg-green-100 text-green-800';
    if (status === 'REJECTED' || status === 'WITHDRAWN') return 'bg-red-100 text-red-700';
    return 'bg-yellow-100 text-yellow-800';
  }

  return (
    <AdminShell>
      <div class="flex flex-col -mx-6 -mt-6 min-h-full">

        {/* ── Page header ── */}
        <div class="bg-white border-b border-gray-200 px-6 py-4">
          <h1 class="text-xl font-semibold text-gray-900">Applications</h1>
          <p class="text-sm text-gray-500 mt-0.5">Review submitted applications and update acceptance status.</p>
        </div>

        {/* ── Content ── */}
        <div class="p-6">
          <Show when={error()}>
            <div class="mb-4 rounded-lg border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">{error()}</div>
          </Show>

          <Show when={payload.loading}>
            <div class="table-card">
              <p class="py-10 text-center text-sm text-slate-400">Loading applications…</p>
            </div>
          </Show>

          <Show when={!payload.loading && applications().length === 0}>
            <div class="table-card">
              <p class="py-10 text-center text-sm text-slate-400">No applications found.</p>
            </div>
          </Show>

          <div class="flex flex-col gap-4">
            <For each={applications()}>
              {(app) => {
                const req = createMemo(() => requirementFor(app.requirementId));
                return (
                  <div class="rounded-xl border border-gray-200 bg-white shadow-sm p-5">
                    <div class="flex items-start justify-between gap-3 flex-wrap">
                      <div>
                        <h2 class="text-base font-semibold text-gray-900">{req()?.title || 'Unknown Requirement'}</h2>
                        <p class="text-xs text-slate-400 mt-1">ID: {app.id}</p>
                      </div>
                      <span class={`inline-flex rounded-full px-2.5 py-0.5 text-xs font-medium ${statusBadge(app.status)}`}>{app.status}</span>
                    </div>

                    <div class="mt-3 rounded-lg bg-gray-50 px-4 py-3">
                      <p class="text-xs font-medium text-gray-500 mb-1">Message</p>
                      <p class="text-sm text-gray-700">{app.message || 'No message provided.'}</p>
                    </div>

                    <div class="mt-3 grid grid-cols-2 gap-3 sm:grid-cols-4">
                      <div>
                        <p class="text-xs text-gray-500">Quote</p>
                        <p class="text-sm font-medium text-gray-900">₹ {app.quote || 0}</p>
                      </div>
                      <div>
                        <p class="text-xs text-gray-500">Category</p>
                        <p class="text-sm font-medium text-gray-900">{req()?.profession || '—'}</p>
                      </div>
                      <div>
                        <p class="text-xs text-gray-500">Location</p>
                        <p class="text-sm font-medium text-gray-900">{req()?.location || '—'}</p>
                      </div>
                      <div>
                        <p class="text-xs text-gray-500">Applied On</p>
                        <p class="text-sm font-medium text-gray-900">{app.createdAt ? new Date(app.createdAt).toLocaleDateString() : '—'}</p>
                      </div>
                    </div>

                    <div class="mt-4 flex gap-2 flex-wrap">
                      <Show when={app.status === 'SUBMITTED' || app.status === 'SHORTLISTED'}>
                        <button
                          class="btn-primary"
                          disabled={busyId() === app.id}
                          onClick={() => updateStatus(app.id, 'ACCEPTED')}
                        >
                          Accept Bid
                        </button>
                        <button
                          class="rounded-lg border border-red-200 bg-red-50 px-4 py-2 text-sm font-medium text-red-600 hover:bg-red-100 transition-colors"
                          disabled={busyId() === app.id}
                          onClick={() => updateStatus(app.id, 'REJECTED')}
                        >
                          Decline
                        </button>
                        <button
                          class="rounded-lg border border-gray-200 bg-white px-4 py-2 text-sm font-medium text-gray-700 hover:bg-gray-50 transition-colors"
                          disabled={busyId() === app.id}
                          onClick={() => updateStatus(app.id, 'WITHDRAWN')}
                        >
                          Withdraw
                        </button>
                      </Show>
                    </div>
                  </div>
                );
              }}
            </For>
          </div>
        </div>
      </div>
    </AdminShell>
  );
}