'use client';

import { useState, useEffect } from 'react';
import { useLanguage } from '@/context/LanguageContext';
import { ticketsApi, eventsApi, Ticket, Event } from '@/lib/api';
import Card from '@/components/ui/Card';
import Button from '@/components/ui/Button';
import { BottomSheet, MoreMenu, DropdownItem, AdminMobileStyles } from '@/components/admin/MobileComponents';
import { 
  TicketIcon, 
  CheckCircleIcon, 
  XCircleIcon,
  CurrencyDollarIcon,
  UserIcon,
  EnvelopeIcon,
  PhoneIcon,
  FunnelIcon,
  MagnifyingGlassIcon,
} from '@heroicons/react/24/outline';
import toast from 'react-hot-toast';
import clsx from 'clsx';

interface TicketWithDetails extends Omit<Ticket, 'payment'> {
  bookingId?: string;
  event?: Event;
  payment?: {
    id: string;
    ticketId?: string;
    provider: string;
    amount: number;
    currency: string;
    status: string;
    reference?: string;
    createdAt?: string;
    updatedAt?: string;
  };
}

export default function AdminBookingsPage() {
  const { locale } = useLanguage();
  const [tickets, setTickets] = useState<TicketWithDetails[]>([]);
  const [events, setEvents] = useState<Event[]>([]);
  const [loading, setLoading] = useState(true);
  const [processing, setProcessing] = useState<string | null>(null);
  
  const [selectedEvent, setSelectedEvent] = useState<string>('');
  const [selectedStatus, setSelectedStatus] = useState<string>('');
  const [selectedPaymentStatus, setSelectedPaymentStatus] = useState<string>('');
  const [searchQuery, setSearchQuery] = useState('');
  const [mobileFilterOpen, setMobileFilterOpen] = useState(false);

  useEffect(() => {
    loadData();
  }, []);

  const loadData = async () => {
    try {
      const [ticketsRes, eventsRes] = await Promise.all([
        ticketsApi.getAll(),
        eventsApi.getAll(),
      ]);
      
      const ticketsWithDetails = await Promise.all(
        ticketsRes.tickets.map(async (ticket) => {
          try {
            const { ticket: fullTicket } = await ticketsApi.getById(ticket.id);
            return fullTicket;
          } catch {
            return ticket;
          }
        })
      );
      
      setTickets(ticketsWithDetails);
      setEvents(eventsRes.events);
    } catch (error) {
      toast.error('Failed to load bookings');
    } finally {
      setLoading(false);
    }
  };

  const handleMarkPaid = async (ticketId: string) => {
    setProcessing(ticketId);
    try {
      await ticketsApi.markPaid(ticketId);
      toast.success('Payment marked as received');
      loadData();
    } catch (error: any) {
      toast.error(error.message || 'Failed to mark payment');
    } finally {
      setProcessing(null);
    }
  };

  const handleCheckin = async (ticketId: string) => {
    setProcessing(ticketId);
    try {
      await ticketsApi.checkin(ticketId);
      toast.success('Check-in successful');
      loadData();
    } catch (error: any) {
      toast.error(error.message || 'Failed to check in');
    } finally {
      setProcessing(null);
    }
  };

  const handleCancel = async (ticketId: string) => {
    if (!confirm('Are you sure you want to cancel this booking?')) return;
    
    setProcessing(ticketId);
    try {
      await ticketsApi.cancel(ticketId);
      toast.success('Booking cancelled');
      loadData();
    } catch (error: any) {
      toast.error(error.message || 'Failed to cancel');
    } finally {
      setProcessing(null);
    }
  };

  const formatDate = (dateStr: string) => {
    return new Date(dateStr).toLocaleDateString(locale === 'es' ? 'es-ES' : 'en-US', {
      month: 'short',
      day: 'numeric',
      year: 'numeric',
      hour: '2-digit',
      minute: '2-digit',
      timeZone: 'America/Asuncion',
    });
  };

  const getStatusColor = (status: string) => {
    switch (status) {
      case 'confirmed': return 'bg-green-100 text-green-800';
      case 'pending': return 'bg-yellow-100 text-yellow-800';
      case 'cancelled': return 'bg-red-100 text-red-800';
      case 'checked_in': return 'bg-blue-100 text-blue-800';
      default: return 'bg-gray-100 text-gray-800';
    }
  };

  const getPaymentStatusColor = (status: string) => {
    switch (status) {
      case 'paid': return 'bg-green-100 text-green-800';
      case 'pending': return 'bg-yellow-100 text-yellow-800';
      case 'failed':
      case 'cancelled': return 'bg-red-100 text-red-800';
      case 'refunded': return 'bg-purple-100 text-purple-800';
      default: return 'bg-gray-100 text-gray-800';
    }
  };

  const getPaymentMethodLabel = (provider: string) => {
    switch (provider) {
      case 'bancard': return 'TPago / Card';
      case 'lightning': return 'Bitcoin Lightning';
      case 'cash': return 'Cash at Event';
      default: return provider;
    }
  };

  const filteredTickets = tickets.filter((ticket) => {
    if (selectedEvent && ticket.eventId !== selectedEvent) return false;
    if (selectedStatus && ticket.status !== selectedStatus) return false;
    if (selectedPaymentStatus && ticket.payment?.status !== selectedPaymentStatus) return false;
    if (searchQuery) {
      const q = searchQuery.toLowerCase();
      const name = `${ticket.attendeeFirstName} ${ticket.attendeeLastName || ''}`.toLowerCase();
      return name.includes(q) || (ticket.attendeeEmail?.toLowerCase().includes(q) || false);
    }
    return true;
  });

  const sortedTickets = [...filteredTickets].sort(
    (a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime()
  );

  const stats = {
    total: tickets.length,
    pending: tickets.filter(t => t.status === 'pending').length,
    confirmed: tickets.filter(t => t.status === 'confirmed').length,
    checkedIn: tickets.filter(t => t.status === 'checked_in').length,
    cancelled: tickets.filter(t => t.status === 'cancelled').length,
    pendingPayment: tickets.filter(t => t.payment?.status === 'pending').length,
  };

  const getBookingInfo = (ticket: TicketWithDetails) => {
    if (!ticket.bookingId) {
      return { ticketCount: 1, bookingTotal: Number(ticket.payment?.amount || 0) };
    }
    const bookingTickets = tickets.filter(t => t.bookingId === ticket.bookingId);
    return {
      ticketCount: bookingTickets.length,
      bookingTotal: bookingTickets.reduce((sum, t) => sum + Number(t.payment?.amount || 0), 0),
    };
  };

  const hasActiveFilters = selectedEvent || selectedStatus || selectedPaymentStatus || searchQuery;

  const clearFilters = () => {
    setSelectedEvent('');
    setSelectedStatus('');
    setSelectedPaymentStatus('');
    setSearchQuery('');
  };

  const getPrimaryAction = (ticket: TicketWithDetails) => {
    if (ticket.status === 'pending' && ticket.payment?.status === 'pending') {
      return { label: 'Mark Paid', onClick: () => handleMarkPaid(ticket.id), color: 'text-green-600' };
    }
    if (ticket.status === 'confirmed') {
      return { label: 'Check In', onClick: () => handleCheckin(ticket.id), color: 'text-blue-600' };
    }
    return null;
  };

  if (loading) {
    return (
      <div className="flex items-center justify-center py-12">
        <div className="animate-spin w-8 h-8 border-4 border-primary-yellow border-t-transparent rounded-full" />
      </div>
    );
  }

  return (
    <div>
      <div className="flex items-center justify-between mb-6">
        <h1 className="text-xl md:text-2xl font-bold text-primary-dark">Manage Bookings</h1>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-3 md:grid-cols-3 lg:grid-cols-6 gap-2 md:gap-4 mb-6">
        <Card className="p-3 md:p-4 text-center">
          <p className="text-xl md:text-2xl font-bold text-primary-dark">{stats.total}</p>
          <p className="text-xs md:text-sm text-gray-500">Total</p>
        </Card>
        <Card className="p-3 md:p-4 text-center border-l-4 border-yellow-400">
          <p className="text-xl md:text-2xl font-bold text-yellow-600">{stats.pending}</p>
          <p className="text-xs md:text-sm text-gray-500">Pending</p>
        </Card>
        <Card className="p-3 md:p-4 text-center border-l-4 border-green-400">
          <p className="text-xl md:text-2xl font-bold text-green-600">{stats.confirmed}</p>
          <p className="text-xs md:text-sm text-gray-500">Confirmed</p>
        </Card>
        <Card className="p-3 md:p-4 text-center border-l-4 border-blue-400">
          <p className="text-xl md:text-2xl font-bold text-blue-600">{stats.checkedIn}</p>
          <p className="text-xs md:text-sm text-gray-500">Checked In</p>
        </Card>
        <Card className="p-3 md:p-4 text-center border-l-4 border-red-400">
          <p className="text-xl md:text-2xl font-bold text-red-600">{stats.cancelled}</p>
          <p className="text-xs md:text-sm text-gray-500">Cancelled</p>
        </Card>
        <Card className="p-3 md:p-4 text-center border-l-4 border-orange-400">
          <p className="text-xl md:text-2xl font-bold text-orange-600">{stats.pendingPayment}</p>
          <p className="text-xs md:text-sm text-gray-500">Pending Pay</p>
        </Card>
      </div>

      {/* Desktop Filters */}
      <Card className="p-4 mb-6 hidden md:block">
        <div className="flex items-center gap-2 mb-4">
          <FunnelIcon className="w-5 h-5 text-gray-500" />
          <span className="font-medium">Filters</span>
        </div>
        <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Search</label>
            <div className="relative">
              <MagnifyingGlassIcon className="w-4 h-4 absolute left-3 top-1/2 -translate-y-1/2 text-gray-400" />
              <input
                type="text"
                placeholder="Name or email..."
                value={searchQuery}
                onChange={(e) => setSearchQuery(e.target.value)}
                className="w-full pl-9 pr-3 py-2 rounded-btn border border-secondary-light-gray text-sm focus:outline-none focus:ring-2 focus:ring-primary-yellow"
              />
            </div>
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Event</label>
            <select value={selectedEvent} onChange={(e) => setSelectedEvent(e.target.value)}
              className="w-full px-3 py-2 rounded-btn border border-secondary-light-gray text-sm">
              <option value="">All Events</option>
              {events.map((event) => (
                <option key={event.id} value={event.id}>{event.title}</option>
              ))}
            </select>
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Booking Status</label>
            <select value={selectedStatus} onChange={(e) => setSelectedStatus(e.target.value)}
              className="w-full px-3 py-2 rounded-btn border border-secondary-light-gray text-sm">
              <option value="">All Statuses</option>
              <option value="pending">Pending</option>
              <option value="confirmed">Confirmed</option>
              <option value="checked_in">Checked In</option>
              <option value="cancelled">Cancelled</option>
            </select>
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Payment Status</label>
            <select value={selectedPaymentStatus} onChange={(e) => setSelectedPaymentStatus(e.target.value)}
              className="w-full px-3 py-2 rounded-btn border border-secondary-light-gray text-sm">
              <option value="">All Payments</option>
              <option value="pending">Pending</option>
              <option value="paid">Paid</option>
              <option value="refunded">Refunded</option>
              <option value="failed">Failed</option>
            </select>
          </div>
        </div>
        {hasActiveFilters && (
          <div className="mt-3 text-xs text-gray-500 flex items-center gap-2">
            <span>Showing {sortedTickets.length} of {tickets.length}</span>
            <button onClick={clearFilters} className="text-primary-yellow hover:underline">Clear</button>
          </div>
        )}
      </Card>

      {/* Mobile Toolbar */}
      <div className="md:hidden space-y-2 mb-4">
        <div className="relative">
          <MagnifyingGlassIcon className="w-4 h-4 absolute left-3 top-1/2 -translate-y-1/2 text-gray-400" />
          <input
            type="text"
            placeholder="Search name or email..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="w-full pl-9 pr-3 py-2.5 text-sm rounded-btn border border-secondary-light-gray focus:outline-none focus:ring-2 focus:ring-primary-yellow"
          />
        </div>
        <div className="flex items-center gap-2">
          <button
            onClick={() => setMobileFilterOpen(true)}
            className={clsx(
              'flex items-center gap-1.5 px-3 py-2 rounded-btn border text-sm min-h-[44px]',
              hasActiveFilters
                ? 'border-primary-yellow bg-yellow-50 text-primary-dark'
                : 'border-secondary-light-gray text-gray-600'
            )}
          >
            <FunnelIcon className="w-4 h-4" />
            Filters
            {hasActiveFilters && <span className="text-xs">({sortedTickets.length})</span>}
          </button>
          {hasActiveFilters && (
            <button onClick={clearFilters} className="text-xs text-primary-yellow ml-auto min-h-[44px] flex items-center">
              Clear
            </button>
          )}
        </div>
      </div>

      {/* Desktop: Table */}
      <Card className="overflow-hidden hidden md:block">
        <div className="overflow-x-auto">
          <table className="w-full">
            <thead className="bg-secondary-gray">
              <tr>
                <th className="text-left px-4 py-2 text-xs font-medium text-gray-500 uppercase tracking-wider">Attendee</th>
                <th className="text-left px-4 py-2 text-xs font-medium text-gray-500 uppercase tracking-wider">Event</th>
                <th className="text-left px-4 py-2 text-xs font-medium text-gray-500 uppercase tracking-wider">Payment</th>
                <th className="text-left px-4 py-2 text-xs font-medium text-gray-500 uppercase tracking-wider">Status</th>
                <th className="text-left px-4 py-2 text-xs font-medium text-gray-500 uppercase tracking-wider">Booked</th>
                <th className="text-right px-4 py-2 text-xs font-medium text-gray-500 uppercase tracking-wider">Actions</th>
              </tr>
            </thead>
            <tbody className="divide-y divide-secondary-light-gray">
              {sortedTickets.length === 0 ? (
                <tr>
                  <td colSpan={6} className="px-4 py-12 text-center text-gray-500 text-sm">
                    No bookings found.
                  </td>
                </tr>
              ) : (
                sortedTickets.map((ticket) => {
                  const bookingInfo = getBookingInfo(ticket);
                  return (
                    <tr key={ticket.id} className="hover:bg-gray-50">
                      <td className="px-4 py-3">
                        <p className="font-medium text-sm">{ticket.attendeeFirstName} {ticket.attendeeLastName || ''}</p>
                        <p className="text-xs text-gray-500 truncate max-w-[200px]">{ticket.attendeeEmail || 'N/A'}</p>
                        {ticket.attendeePhone && <p className="text-xs text-gray-400">{ticket.attendeePhone}</p>}
                      </td>
                      <td className="px-4 py-3">
                        <span className="text-sm truncate max-w-[150px] block">
                          {ticket.event?.title || events.find(e => e.id === ticket.eventId)?.title || 'Unknown'}
                        </span>
                      </td>
                      <td className="px-4 py-3">
                        <span className={`inline-block px-2 py-0.5 rounded-full text-xs font-medium ${getPaymentStatusColor(ticket.payment?.status || 'pending')}`}>
                          {ticket.payment?.status || 'pending'}
                        </span>
                        <p className="text-xs text-gray-500 mt-0.5">{getPaymentMethodLabel(ticket.payment?.provider || 'cash')}</p>
                        {ticket.payment && (
                          <p className="text-xs font-medium mt-0.5">{bookingInfo.bookingTotal.toLocaleString()} {ticket.payment.currency}</p>
                        )}
                      </td>
                      <td className="px-4 py-3">
                        <span className={`inline-block px-2 py-0.5 rounded-full text-xs font-medium ${getStatusColor(ticket.status)}`}>
                          {ticket.status.replace('_', ' ')}
                        </span>
                        {ticket.bookingId && (
                          <p className="text-[10px] text-purple-600 mt-0.5">Group Booking</p>
                        )}
                      </td>
                      <td className="px-4 py-3 text-xs text-gray-500">
                        {formatDate(ticket.createdAt)}
                      </td>
                      <td className="px-4 py-3">
                        <div className="flex items-center justify-end gap-1">
                          {ticket.status === 'pending' && ticket.payment?.status === 'pending' && (
                            <Button size="sm" variant="outline" onClick={() => handleMarkPaid(ticket.id)}
                              isLoading={processing === ticket.id} className="text-xs px-2 py-1">
                              Mark Paid
                            </Button>
                          )}
                          {ticket.status === 'confirmed' && (
                            <Button size="sm" onClick={() => handleCheckin(ticket.id)}
                              isLoading={processing === ticket.id} className="text-xs px-2 py-1">
                              Check In
                            </Button>
                          )}
                          {(ticket.status === 'pending' || ticket.status === 'confirmed') && (
                            <MoreMenu>
                              <DropdownItem onClick={() => handleCancel(ticket.id)} className="text-red-600">
                                <XCircleIcon className="w-4 h-4 mr-2" /> Cancel
                              </DropdownItem>
                            </MoreMenu>
                          )}
                          {ticket.status === 'checked_in' && (
                            <span className="text-xs text-green-600 flex items-center gap-1">
                              <CheckCircleIcon className="w-4 h-4" /> Attended
                            </span>
                          )}
                          {ticket.status === 'cancelled' && (
                            <span className="text-xs text-gray-400">Cancelled</span>
                          )}
                        </div>
                      </td>
                    </tr>
                  );
                })
              )}
            </tbody>
          </table>
        </div>
      </Card>

      {/* Mobile: Card List */}
      <div className="md:hidden space-y-2">
        {sortedTickets.length === 0 ? (
          <div className="text-center py-10 text-gray-500 text-sm">
            No bookings found.
          </div>
        ) : (
          sortedTickets.map((ticket) => {
            const bookingInfo = getBookingInfo(ticket);
            const primary = getPrimaryAction(ticket);
            const eventTitle = ticket.event?.title || events.find(e => e.id === ticket.eventId)?.title || 'Unknown';
            return (
              <Card key={ticket.id} className="p-3">
                <div className="flex items-start justify-between gap-2">
                  <div className="min-w-0 flex-1">
                    <p className="font-medium text-sm truncate">{ticket.attendeeFirstName} {ticket.attendeeLastName || ''}</p>
                    <p className="text-xs text-gray-500 truncate">{ticket.attendeeEmail || 'N/A'}</p>
                  </div>
                  <div className="flex items-center gap-1.5 flex-shrink-0">
                    <span className={clsx('inline-flex items-center rounded-full px-1.5 py-0.5 text-[10px] font-medium', getStatusColor(ticket.status))}>
                      {ticket.status.replace('_', ' ')}
                    </span>
                  </div>
                </div>
                <div className="mt-2 flex items-center gap-2 text-xs text-gray-500">
                  <span className="truncate">{eventTitle}</span>
                  <span className="text-gray-300">|</span>
                  <span className={clsx('inline-flex items-center rounded-full px-1.5 py-0.5 text-[10px] font-medium', getPaymentStatusColor(ticket.payment?.status || 'pending'))}>
                    {ticket.payment?.status || 'pending'}
                  </span>
                  {ticket.payment && (
                    <>
                      <span className="text-gray-300">|</span>
                      <span className="font-medium text-gray-700">{bookingInfo.bookingTotal.toLocaleString()} {ticket.payment.currency}</span>
                    </>
                  )}
                </div>
                {ticket.bookingId && (
                  <p className="text-[10px] text-purple-600 mt-1">{bookingInfo.ticketCount} tickets - Group Booking</p>
                )}
                <div className="flex items-center justify-between mt-2 pt-2 border-t border-gray-100">
                  <p className="text-[10px] text-gray-400">{formatDate(ticket.createdAt)}</p>
                  <div className="flex items-center gap-1">
                    {primary && (
                      <Button size="sm" variant={ticket.status === 'confirmed' ? 'primary' : 'outline'}
                        onClick={primary.onClick} isLoading={processing === ticket.id}
                        className="text-xs px-2.5 py-1.5 min-h-[36px]">
                        {primary.label}
                      </Button>
                    )}
                    {(ticket.status === 'pending' || ticket.status === 'confirmed') && (
                      <MoreMenu>
                        {ticket.status === 'pending' && ticket.payment?.status === 'pending' && !primary && (
                          <DropdownItem onClick={() => handleMarkPaid(ticket.id)}>
                            <CurrencyDollarIcon className="w-4 h-4 mr-2" /> Mark Paid
                          </DropdownItem>
                        )}
                        <DropdownItem onClick={() => handleCancel(ticket.id)} className="text-red-600">
                          <XCircleIcon className="w-4 h-4 mr-2" /> Cancel Booking
                        </DropdownItem>
                      </MoreMenu>
                    )}
                    {ticket.status === 'checked_in' && (
                      <span className="text-[10px] text-green-600 flex items-center gap-1">
                        <CheckCircleIcon className="w-3.5 h-3.5" /> Attended
                      </span>
                    )}
                    {ticket.status === 'cancelled' && (
                      <span className="text-[10px] text-gray-400">Cancelled</span>
                    )}
                  </div>
                </div>
              </Card>
            );
          })
        )}
      </div>

      {/* Mobile Filter BottomSheet */}
      <BottomSheet open={mobileFilterOpen} onClose={() => setMobileFilterOpen(false)} title="Filters">
        <div className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Event</label>
            <select value={selectedEvent} onChange={(e) => setSelectedEvent(e.target.value)}
              className="w-full px-3 py-2.5 rounded-btn border border-secondary-light-gray text-sm min-h-[44px]">
              <option value="">All Events</option>
              {events.map((event) => (
                <option key={event.id} value={event.id}>{event.title}</option>
              ))}
            </select>
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Booking Status</label>
            <div className="space-y-1">
              {[
                { value: '', label: 'All Statuses' },
                { value: 'pending', label: `Pending (${stats.pending})` },
                { value: 'confirmed', label: `Confirmed (${stats.confirmed})` },
                { value: 'checked_in', label: `Checked In (${stats.checkedIn})` },
                { value: 'cancelled', label: `Cancelled (${stats.cancelled})` },
              ].map((opt) => (
                <button
                  key={opt.value}
                  onClick={() => setSelectedStatus(opt.value)}
                  className={clsx(
                    'w-full text-left px-3 py-2.5 rounded-btn text-sm min-h-[44px] flex items-center justify-between',
                    selectedStatus === opt.value ? 'bg-yellow-50 text-primary-dark font-medium' : 'hover:bg-gray-50'
                  )}
                >
                  {opt.label}
                  {selectedStatus === opt.value && <CheckCircleIcon className="w-4 h-4 text-primary-yellow" />}
                </button>
              ))}
            </div>
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Payment Status</label>
            <div className="space-y-1">
              {[
                { value: '', label: 'All Payments' },
                { value: 'pending', label: 'Pending' },
                { value: 'paid', label: 'Paid' },
                { value: 'refunded', label: 'Refunded' },
                { value: 'failed', label: 'Failed' },
              ].map((opt) => (
                <button
                  key={opt.value}
                  onClick={() => setSelectedPaymentStatus(opt.value)}
                  className={clsx(
                    'w-full text-left px-3 py-2.5 rounded-btn text-sm min-h-[44px] flex items-center justify-between',
                    selectedPaymentStatus === opt.value ? 'bg-yellow-50 text-primary-dark font-medium' : 'hover:bg-gray-50'
                  )}
                >
                  {opt.label}
                  {selectedPaymentStatus === opt.value && <CheckCircleIcon className="w-4 h-4 text-primary-yellow" />}
                </button>
              ))}
            </div>
          </div>
          <div className="flex gap-3 pt-2">
            <Button variant="outline" onClick={() => { clearFilters(); setMobileFilterOpen(false); }} className="flex-1 min-h-[44px]">
              Clear All
            </Button>
            <Button onClick={() => setMobileFilterOpen(false)} className="flex-1 min-h-[44px]">
              Apply
            </Button>
          </div>
        </div>
      </BottomSheet>

      <AdminMobileStyles />
    </div>
  );
}