'use client';

import { useState } from 'react';
import { useQuery } from '@tanstack/react-query';
import { Eye } from 'lucide-react';
import DataTable from '@/components/ui/DataTable';
import Badge from '@/components/ui/Badge';
import ActionButton from '@/components/ui/ActionButton';
import Modal from '@/components/ui/Modal';
import Pagination from '@/components/ui/Pagination';
import { packagesApi } from '@/lib/api';
import { formatDateTime, formatCurrency } from '@/lib/utils';
import { getErrorMessage } from '@/lib/api-client';

const Field = ({ label, value, mono = false, truncate = false }: { label: string; value: string; mono?: boolean; truncate?: boolean }) => (
  <div className="bg-muted/40 rounded-lg p-3">
    <p className="text-xs text-muted-foreground mb-1">{label}</p>
    <p className={`text-sm font-semibold text-foreground${mono ? ' font-mono' : ''}${truncate ? ' truncate' : ''}`} title={value}>{value || '—'}</p>
  </div>
);

const SectionHeader = ({ title }: { title: string }) => (
  <h3 className="text-xs font-bold uppercase tracking-widest text-muted-foreground mb-3 flex items-center gap-2">
    <span className="w-4 h-px bg-muted-foreground/40 inline-block" />{title}
  </h3>
);

export default function PackageBookingsPage() {
  const [filters, setFilters] = useState({ packageId: '', status: '', page: 1, pageSize: 20 });
  const [selected, setSelected] = useState<any>(null);

  const { data: rawData, isLoading, error } = useQuery({
    queryKey: ['package-bookings', filters],
    queryFn: () => packagesApi.getBookings(filters),
  });

  // Unwrap in case the interceptor double-wraps: { data: { items, ... } } or { items, ... }
  const data: any = (rawData as any)?.items ? rawData : (rawData as any)?.data ?? rawData;

  const { data: packagesData } = useQuery({
    queryKey: ['packages-all-simple'],
    queryFn: () => packagesApi.getAll({ pageSize: 100 }),
  });

  const packages: any[] = packagesData?.items || [];

  const columns = [
    {
      key: 'bookingRef',
      label: 'Reference',
      sortable: true,
      render: (b: any) => (
        <div>
          <div className="font-mono font-semibold flex items-center gap-1.5">
            {b.bookingRef}
            <span className="inline-flex items-center bg-emerald-100 dark:bg-emerald-900/40 text-emerald-700 dark:text-emerald-400 text-xs font-semibold px-1.5 py-0.5 rounded">PKG</span>
          </div>
          <div className="text-xs text-muted-foreground">{b.package?.name}</div>
        </div>
      ),
    },
    {
      key: 'tier',
      label: 'Tier',
      render: (b: any) => b.priceTier ? (
        <div>
          <div className="text-sm font-medium">{b.priceTier.label}</div>
          <div className="text-xs text-muted-foreground">{b.priceTier.seatType}</div>
        </div>
      ) : <span className="text-muted-foreground">—</span>,
    },
    {
      key: 'passengers',
      label: 'Passengers',
      render: (b: any) => (
        <div>
          <div className="font-semibold">{b.passengerCount}</div>
          <div className="text-xs text-muted-foreground">{b.contactPhone || b.contactEmail || '—'}</div>
        </div>
      ),
    },
    {
      key: 'payment',
      label: 'Payment',
      render: (b: any) => (
        <div>
          <Badge variant="status" status={b.paymentIntent?.status || 'PENDING'}>
            {b.paymentIntent?.status || 'PENDING'}
          </Badge>
          <div className="text-xs text-muted-foreground mt-1">{formatCurrency(b.totalMinor, b.currency || 'ETB')}</div>
        </div>
      ),
    },
    {
      key: 'status',
      label: 'Status',
      render: (b: any) => <Badge variant="status" status={b.status}>{b.status}</Badge>,
    },
    {
      key: 'createdAt',
      label: 'Booked At',
      render: (b: any) => <span className="text-sm text-muted-foreground">{formatDateTime(b.createdAt)}</span>,
    },
  ];

  const actions = [
    { label: 'View', onClick: (b: any) => setSelected(b), variant: 'secondary' as const, icon: Eye },
  ];

  return (
    <div className="space-y-6">
      <div>
        <h1 className="text-2xl font-bold text-foreground">Package Bookings</h1>
        <p className="text-muted-foreground">All bookings made through travel packages</p>
      </div>

      <div className="card">
        {error && (
          <div className="mb-4 rounded-lg bg-red-50 dark:bg-red-900/20 p-4 text-sm text-red-800 dark:text-red-200">
            Error: {getErrorMessage(error)}
          </div>
        )}
        <div className="flex flex-wrap gap-3 mb-4">
          <div className="flex-1 min-w-48">
            <select className="input" value={filters.packageId}
              onChange={(e) => setFilters({ ...filters, packageId: e.target.value, page: 1 })}>
              <option value="">All Packages</option>
              {packages.map((p: any) => (
                <option key={p.id} value={p.id}>{p.name} ({p.code})</option>
              ))}
            </select>
          </div>
          <select className="input w-48" value={filters.status}
            onChange={(e) => setFilters({ ...filters, status: e.target.value, page: 1 })}>
            <option value="">All Statuses</option>
            <option value="PENDING_PAYMENT">Pending Payment</option>
            <option value="CONFIRMED">Confirmed</option>
            <option value="CANCELLED">Cancelled</option>
          </select>
        </div>
        <DataTable data={data?.items || []} columns={columns} actions={actions} loading={isLoading} emptyMessage="No package bookings found" />
        {data?.totalPages > 1 && (
          <Pagination currentPage={filters.page} totalPages={data.totalPages}
            onPageChange={(page) => setFilters({ ...filters, page })} />
        )}
      </div>

      <Modal isOpen={!!selected} onClose={() => setSelected(null)} title="Package Booking Details" size="xl">
        {selected && (() => {
          const b = selected;
          return (
            <div>
              <div className="-mx-6 -mt-4 mb-6 px-6 py-5 bg-gradient-to-r from-emerald-600 to-emerald-700 rounded-t-lg">
                <div className="flex items-start justify-between gap-4">
                  <div>
                    <p className="text-emerald-100 text-xs font-semibold uppercase tracking-widest mb-1">Booking Reference</p>
                    <p className="text-white text-3xl font-mono font-bold tracking-wider">{b.bookingRef}</p>
                  </div>
                  <div className="text-right shrink-0">
                    <Badge variant="status" status={b.status}>{b.status}</Badge>
                    <p className="text-emerald-200 text-xs mt-2">{formatDateTime(b.createdAt)}</p>
                  </div>
                </div>
                <div className="mt-4 flex flex-wrap gap-2">
                  {[b.package?.name, b.priceTier?.label, `${b.passengerCount} passenger${b.passengerCount !== 1 ? 's' : ''}`].filter(Boolean).map((tag) => (
                    <span key={tag} className="inline-flex items-center gap-1.5 bg-white/20 text-white text-xs font-medium px-3 py-1 rounded-full">
                      <span className="w-1.5 h-1.5 rounded-full bg-emerald-200" />{tag}
                    </span>
                  ))}
                </div>
              </div>

              <div className="space-y-6">
                <section>
                  <SectionHeader title="Package" />
                  <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
                    <Field label="Package Name" value={b.package?.name} />
                    <Field label="Package Code" value={b.package?.code} mono />
                    <Field label="Tier" value={b.priceTier?.label} />
                    <Field label="Seat Type" value={b.priceTier?.seatType} />
                  </div>
                </section>

                <section>
                  <SectionHeader title="Contact" />
                  <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
                    <Field label="Email" value={b.contactEmail} truncate />
                    <Field label="Phone" value={b.contactPhone} />
                    <Field label="Promo Code" value={b.promoCode || 'None'} />
                    <Field label="Passenger ID" value={b.passengerId || 'Guest'} mono truncate />
                  </div>
                </section>

                <section>
                  <SectionHeader title="Payment" />
                  <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
                    <div className="bg-emerald-50 dark:bg-emerald-900/20 border border-emerald-100 dark:border-emerald-800 rounded-lg p-3 col-span-2">
                      <p className="text-xs text-emerald-700 dark:text-emerald-400 mb-1">Total Amount</p>
                      <p className="text-xl font-bold text-emerald-800 dark:text-emerald-300">{formatCurrency(b.totalMinor, b.currency || 'ETB')}</p>
                      {b.displayCurrency && b.displayCurrency !== (b.currency || 'ETB') && (
                        <p className="text-xs text-emerald-600 dark:text-emerald-500 mt-0.5">
                          ≈ {formatCurrency(b.displayTotalMinor ?? b.totalMinor, b.displayCurrency)}
                        </p>
                      )}
                    </div>
                    <div className="bg-muted/40 rounded-lg p-3">
                      <p className="text-xs text-muted-foreground mb-2">Payment Status</p>
                      <Badge variant="status" status={b.paymentIntent?.status || 'PENDING'}>{b.paymentIntent?.status || 'PENDING'}</Badge>
                    </div>
                    <Field label="Method" value={b.paymentIntent?.method || '—'} />
                  </div>
                </section>

                {b.passengers?.length > 0 && (
                  <section>
                    <SectionHeader title={`Passengers (${b.passengers.length})`} />
                    <div className="divide-y divide-muted rounded-lg border border-muted overflow-hidden">
                      {b.passengers.map((p: any, i: number) => {
                        const isChild = i >= (b.adultCount ?? b.passengerCount);
                        return (
                          <div key={i} className="flex items-center justify-between px-4 py-3 bg-muted/20 hover:bg-muted/40 transition-colors">
                            <div className="flex items-center gap-3">
                              <span className="w-6 h-6 rounded-full bg-emerald-100 dark:bg-emerald-900/40 text-emerald-700 dark:text-emerald-400 text-xs font-bold flex items-center justify-center shrink-0">{i + 1}</span>
                              <div>
                                <p className="text-sm font-semibold">{p.passengerName}</p>
                                <p className="text-xs text-muted-foreground">
                                  {p.dateOfBirth ? new Date(p.dateOfBirth).toLocaleDateString() : ''}
                                  {p.idDocumentType ? ` · ${p.idDocumentType}` : ''}
                                  {p.passportNumber ? ` · ${p.passportNumber}` : ''}
                                </p>
                              </div>
                            </div>
                            <span className={`text-[10px] font-bold px-2 py-0.5 rounded-full ${
                              isChild
                                ? 'bg-amber-100 dark:bg-amber-900/30 text-amber-700 dark:text-amber-400'
                                : 'bg-blue-100 dark:bg-blue-900/30 text-blue-700 dark:text-blue-400'
                            }`}>
                              {isChild ? 'CHILD' : 'ADULT'}
                            </span>
                          </div>
                        );
                      })}
                    </div>
                  </section>
                )}

                <section>
                  <SectionHeader title="Timestamps" />
                  <div className="grid grid-cols-2 md:grid-cols-3 gap-3">
                    <Field label="Created" value={formatDateTime(b.createdAt)} />
                    <Field label="Last Updated" value={formatDateTime(b.updatedAt)} />
                    <Field label="Booking ID" value={b.id} mono truncate />
                  </div>
                </section>
              </div>

              <div className="flex justify-end gap-2 pt-6 mt-2 border-t border-muted">
                <ActionButton variant="secondary" onClick={() => setSelected(null)}>Close</ActionButton>
              </div>
            </div>
          );
        })()}
      </Modal>
    </div>
  );
}