import { A, useParams } from '@solidjs/router';
import { createMemo, createResource, createSignal, Show } from 'solid-js';
import AdminShell from '~/components/AdminShell';

const API = '/api/gateway';

type ApprovalDetail = {
  id: string;
  requestType?: string;
  type?: string;
  requestStatus?: string;
  status?: string;
  priority?: number;
  createdAt?: string;
  created_at?: string;
  requester?: { name?: string; email?: string };
  requesterName?: string;
  requesterEmail?: string;
  requester_name?: string;
  requester_email?: string;
  payload?: unknown;
};

async function loadApproval(id: string): Promise<ApprovalDetail | null> {
  try {
    const res = await fetch(`${API}/api/admin/approvals/${id}`);
    if (!res.ok) return null;
    return res.json();
  } catch {
    return null;
  }
}

export default function ApprovalDetailPage() {
  const params = useParams();
  const [approval, { refetch }] = createResource(() => params.id, loadApproval);
  const [acting, setActing] = createSignal('');
  const [error, setError] = createSignal('');

  const status = createMemo(() => (approval()?.requestStatus || approval()?.status || 'PENDING').toUpperCase());
  const requestType = createMemo(() => (approval()?.requestType || approval()?.type || 'OTHER').toUpperCase());
  const requesterName = createMemo(() => approval()?.requester?.name || approval()?.requesterName || approval()?.requester_name || 'Unknown');
  const requesterEmail = createMemo(() => approval()?.requester?.email || approval()?.requesterEmail || approval()?.requester_email || '—');
  const submittedAt = createMemo(() => approval()?.createdAt || approval()?.created_at || '');

  const act = async (nextStatus: 'APPROVED' | 'REJECTED' | 'CHANGES_REQUESTED') => {
    try {
      setActing(nextStatus);
      setError('');
      const res = await fetch(`${API}/api/admin/approvals/${params.id}`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: nextStatus }),
      });
      if (!res.ok) throw new Error(`Failed to mark as ${nextStatus.toLowerCase()}`);
      refetch();
    } catch (err: any) {
      setError(err.message || 'Failed to update approval status');
    } finally {
      setActing('');
    }
  };

  return (
    <AdminShell>
      <div class="page-hero-card page-actions">
        <div>
          <h1 class="page-title">Approval Detail</h1>
          <p class="page-subtitle">Review one approval request in detail and take action.</p>
        </div>
        <A class="btn" href="/admin/approval">Back to Approval List</A>
      </div>

      <Show when={error()}>
        <div class="error-box">{error()}</div>
      </Show>

      <Show when={approval.loading}>
        <div class="card"><p class="notice">Loading approval...</p></div>
      </Show>

      <Show when={!approval.loading && !approval()}>
        <div class="card"><p class="notice">Approval request not found.</p></div>
      </Show>

      <Show when={approval()}>
        <div class="grid" style="margin-top:0">
          <section class="card">
            <h2 style="margin-bottom:8px">Request Summary</h2>
            <p class="notice" style="margin:0"><strong>ID:</strong> {approval()!.id}</p>
            <p class="notice" style="margin:8px 0 0"><strong>Type:</strong> {requestType()}</p>
            <p class="notice" style="margin:8px 0 0"><strong>Status:</strong> {status()}</p>
            <p class="notice" style="margin:8px 0 0"><strong>Priority:</strong> {approval()!.priority ?? '—'}</p>
            <p class="notice" style="margin:8px 0 0"><strong>Submitted:</strong> {submittedAt() ? new Date(submittedAt()).toLocaleString() : '—'}</p>
          </section>

          <section class="card">
            <h2 style="margin-bottom:8px">Requester</h2>
            <p class="notice" style="margin:0"><strong>Name:</strong> {requesterName()}</p>
            <p class="notice" style="margin:8px 0 0"><strong>Email:</strong> {requesterEmail()}</p>
            <div class="actions">
              <button class="btn primary" type="button" disabled={!!acting()} onClick={() => act('APPROVED')}>
                {acting() === 'APPROVED' ? 'Approving...' : 'Approve'}
              </button>
              <button class="btn" type="button" disabled={!!acting()} onClick={() => act('CHANGES_REQUESTED')}>
                {acting() === 'CHANGES_REQUESTED' ? 'Updating...' : 'Request Changes'}
              </button>
              <button class="btn danger" type="button" disabled={!!acting()} onClick={() => act('REJECTED')}>
                {acting() === 'REJECTED' ? 'Rejecting...' : 'Reject'}
              </button>
            </div>
          </section>
        </div>

        <section class="card" style="margin-top:16px">
          <h2 style="margin-bottom:10px">Raw Payload</h2>
          <pre class="json">{JSON.stringify(approval(), null, 2)}</pre>
        </section>
      </Show>
    </AdminShell>
  );
}