import React, { useState, useEffect } from 'react';
import { MessageSquare, ShieldAlert, CheckCircle, Send, Clock, Eye, Trash2 } from 'lucide-react';
import api from '@/lib/api';
import { showToast } from '@/components/common/Toast';

export default function TicketInboxManager() {
  const [tickets, setTickets] = useState<any[]>([]);
  const [selectedTicket, setSelectedTicket] = useState<any>(null);
  const [responseMsg, setResponseMsg] = useState('');
  const [adminNotes, setAdminNotes] = useState('');
  const [ticketStatus, setTicketStatus] = useState('IN_PROGRESS');
  const [loading, setLoading] = useState(false);

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

  const fetchTickets = async () => {
    setLoading(true);
    try {
      const res = await api.get('/admin/tickets');
      setTickets(res.data?.data?.tickets || []);
    } catch (err: any) {
      showToast('Failed to load tickets queue', 'error');
    } finally {
      setLoading(false);
    }
  };

  const handleSelectTicket = (t: any) => {
    setSelectedTicket(t);
    setResponseMsg(t.response || '');
    setAdminNotes(t.adminNotes || '');
    setTicketStatus(t.status);
  };

  const handleReplySubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!selectedTicket) return;

    try {
      await api.put(`/admin/tickets/${selectedTicket.id}`, {
        response: responseMsg,
        adminNotes: adminNotes,
        status: ticketStatus,
      });
      showToast('Ticket reply submitted successfully!', 'success');
      fetchTickets();
      setSelectedTicket(null);
    } catch (err: any) {
      showToast('Failed to submit response', 'error');
    }
  };

  const handleDeleteTicket = async (id: string) => {
    if (!confirm('Are you sure you want to delete this ticket?')) return;
    try {
      await api.delete(`/admin/tickets/${id}`);
      showToast('Ticket deleted successfully', 'success');
      fetchTickets();
      if (selectedTicket?.id === id) setSelectedTicket(null);
    } catch (err: any) {
      showToast('Delete failed', 'error');
    }
  };

  return (
    <div className="bg-white dark:bg-zinc-900 rounded-3xl border border-zinc-200 dark:border-zinc-800 p-6 sm:p-8 space-y-6 shadow-sm">
      <div className="border-b border-zinc-100 dark:border-zinc-800 pb-4">
        <h2 className="text-xl font-extrabold flex items-center gap-2">
          <MessageSquare className="w-5.5 h-5.5 text-[#701a08]" /> Support Tickets & Enquiries Inbox
        </h2>
        <p className="text-xs text-zinc-500 mt-1">
          Review customer questions, generate AWB tracking updates, and write email replies.
        </p>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
        {/* Ticket Queue List */}
        <div className="space-y-3">
          <span className="text-[10px] uppercase font-bold tracking-wider text-zinc-400 block mb-1">Inbox Queue</span>
          {tickets.map((t) => {
            const isSelected = selectedTicket?.id === t.id;
            return (
              <div
                key={t.id}
                onClick={() => handleSelectTicket(t)}
                className={`p-4 rounded-2xl border cursor-pointer transition-all space-y-2.5 ${
                  isSelected
                    ? 'border-[#701a08] bg-rose-50/50 dark:bg-rose-950/20 text-[#701a08]'
                    : 'border-zinc-200 dark:border-zinc-800 hover:border-zinc-300'
                }`}
              >
                <div className="flex justify-between items-center text-[10px] font-bold">
                  <span className="font-mono text-zinc-500">{t.ticketNumber}</span>
                  <span className={`px-2 py-0.5 rounded text-[8px] uppercase ${
                    t.status === 'PENDING'
                      ? 'bg-amber-100 text-amber-800'
                      : t.status === 'RESOLVED'
                      ? 'bg-green-100 text-green-800'
                      : 'bg-blue-100 text-blue-800'
                  }`}>
                    {t.status}
                  </span>
                </div>
                <h4 className="font-extrabold text-xs text-zinc-950 dark:text-zinc-100 truncate">{t.subject}</h4>
                <p className="text-[10px] text-zinc-450 truncate">From: {t.email}</p>
              </div>
            );
          })}
        </div>

        {/* Selected Ticket Response Panel */}
        <div className="lg:col-span-2">
          {selectedTicket ? (
            <form onSubmit={handleReplySubmit} className="space-y-6 text-xs font-semibold">
              <div className="border-b border-zinc-100 dark:border-zinc-800 pb-3 flex justify-between items-center">
                <span className="text-sm font-extrabold text-zinc-900 dark:text-zinc-100">
                  Ticket details {selectedTicket.ticketNumber}
                </span>
                <button
                  type="button"
                  onClick={() => handleDeleteTicket(selectedTicket.id)}
                  className="px-2.5 py-1.5 rounded-lg bg-red-50 hover:bg-red-100 text-red-650 text-[10px] font-bold flex items-center gap-1"
                >
                  <Trash2 className="w-3.5 h-3.5" /> Delete Ticket
                </button>
              </div>

              <div className="p-4 rounded-xl border border-zinc-200 bg-zinc-50 dark:bg-zinc-800/40 space-y-3">
                <div className="flex justify-between text-[11px] font-bold text-zinc-550">
                  <span>Name: {selectedTicket.name}</span>
                  <span>Email: {selectedTicket.email}</span>
                </div>
                <div>
                  <span className="text-[10px] uppercase font-bold text-zinc-400 block mb-0.5">Subject</span>
                  <span className="text-zinc-900 dark:text-zinc-100 font-extrabold text-sm">{selectedTicket.subject}</span>
                </div>
                <div>
                  <span className="text-[10px] uppercase font-bold text-zinc-400 block mb-0.5">Customer Message</span>
                  <p className="text-zinc-700 dark:text-zinc-300 font-medium leading-relaxed bg-white dark:bg-zinc-900 p-3 rounded-lg border">
                    {selectedTicket.message}
                  </p>
                </div>
              </div>

              <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
                <div className="sm:col-span-2">
                  <label className="text-zinc-500 block mb-1">Email Response / Reply</label>
                  <textarea
                    rows={4}
                    value={responseMsg}
                    onChange={(e) => setResponseMsg(e.target.value)}
                    placeholder="Enter support resolution message to email to the customer..."
                    className="w-full px-4 py-2.5 rounded-xl border border-zinc-300 dark:border-zinc-700 bg-zinc-50 dark:bg-zinc-800"
                  />
                </div>

                <div>
                  <label className="text-zinc-500 block mb-1">Internal Admin Notes</label>
                  <textarea
                    rows={2}
                    value={adminNotes}
                    onChange={(e) => setAdminNotes(e.target.value)}
                    placeholder="Private logs visible to other admins only..."
                    className="w-full px-4 py-2.5 rounded-xl border border-zinc-300 dark:border-zinc-700 bg-zinc-50 dark:bg-zinc-800"
                  />
                </div>

                <div>
                  <label className="text-zinc-500 block mb-1">Ticket Status</label>
                  <select
                    value={ticketStatus}
                    onChange={(e) => setTicketStatus(e.target.value)}
                    className="w-full px-4 py-2.5 rounded-xl border border-zinc-300 dark:border-zinc-700 bg-zinc-50 dark:bg-zinc-800"
                  >
                    <option value="PENDING">Pending Action</option>
                    <option value="IN_PROGRESS">In Progress</option>
                    <option value="RESOLVED">Resolved / Closed</option>
                  </select>
                </div>
              </div>

              <div className="flex justify-end pt-4 border-t border-zinc-100 dark:border-zinc-800">
                <button
                  type="submit"
                  className="px-6 py-3 rounded-xl bg-[#701a08] hover:bg-[#581406] text-white font-extrabold flex items-center gap-1.5 shadow-sm"
                >
                  <Send className="w-4 h-4" /> Submit Resolution
                </button>
              </div>
            </form>
          ) : (
            <div className="h-full flex items-center justify-center text-zinc-400 font-bold p-10 bg-zinc-50 dark:bg-zinc-850 rounded-2xl text-center">
              <ShieldAlert className="w-8 h-8 text-zinc-300 mx-auto mb-2 block" />
              Select an enquiry ticket from the inbox list to write customer response.
            </div>
          )}
        </div>
      </div>
    </div>
  );
}