/**
 * Custom Domains Settings Page
 *
 * Manage custom domains - BYOD and domain purchase.
 */

import React, { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { useOutletContext, Link } from 'react-router-dom';
import {
  Globe, Copy, Star, Trash2, RefreshCw, CheckCircle, AlertCircle,
  ShoppingCart, Lock, ArrowUpRight
} from 'lucide-react';
import { Business, User, CustomDomain } from '../../types';
import {
  useCustomDomains,
  useAddCustomDomain,
  useDeleteCustomDomain,
  useVerifyCustomDomain,
  useSetPrimaryDomain
} from '../../hooks/useCustomDomains';
import DomainPurchase from '../../components/DomainPurchase';
import { usePlanFeatures } from '../../hooks/usePlanFeatures';

const CustomDomainsSettings: React.FC = () => {
  const { t } = useTranslation();
  const { business, user } = useOutletContext<{
    business: Business;
    user: User;
  }>();

  // Hooks
  const { data: customDomains = [], isLoading: domainsLoading } = useCustomDomains();
  const addDomainMutation = useAddCustomDomain();
  const deleteDomainMutation = useDeleteCustomDomain();
  const verifyDomainMutation = useVerifyCustomDomain();
  const setPrimaryMutation = useSetPrimaryDomain();

  // Local state
  const [newDomain, setNewDomain] = useState('');
  const [verifyingDomainId, setVerifyingDomainId] = useState<number | null>(null);
  const [verifyError, setVerifyError] = useState<string | null>(null);
  const [showToast, setShowToast] = useState(false);

  const isOwner = user.role === 'owner';
  const { canUse } = usePlanFeatures();

  const handleAddDomain = () => {
    if (!newDomain.trim()) return;

    addDomainMutation.mutate(newDomain, {
      onSuccess: () => {
        setNewDomain('');
        setShowToast(true);
        setTimeout(() => setShowToast(false), 3000);
      },
      onError: (error: any) => {
        alert(error.response?.data?.error || 'Failed to add domain');
      },
    });
  };

  const handleDeleteDomain = (domainId: number) => {
    if (!confirm('Are you sure you want to delete this custom domain?')) return;

    deleteDomainMutation.mutate(domainId, {
      onSuccess: () => {
        setShowToast(true);
        setTimeout(() => setShowToast(false), 3000);
      },
    });
  };

  const handleVerifyDomain = (domainId: number) => {
    setVerifyingDomainId(domainId);
    setVerifyError(null);

    verifyDomainMutation.mutate(domainId, {
      onSuccess: (data: any) => {
        setVerifyingDomainId(null);
        if (data.verified) {
          setShowToast(true);
          setTimeout(() => setShowToast(false), 3000);
        } else {
          setVerifyError(data.message);
        }
      },
      onError: (error: any) => {
        setVerifyingDomainId(null);
        setVerifyError(error.response?.data?.message || 'Verification failed');
      },
    });
  };

  const handleSetPrimary = (domainId: number) => {
    setPrimaryMutation.mutate(domainId, {
      onSuccess: () => {
        setShowToast(true);
        setTimeout(() => setShowToast(false), 3000);
      },
      onError: (error: any) => {
        alert(error.response?.data?.error || 'Failed to set primary domain');
      },
    });
  };

  if (!isOwner) {
    return (
      <div className="text-center py-12">
        <p className="text-gray-500 dark:text-gray-400">
          Only the business owner can access these settings.
        </p>
      </div>
    );
  }

  const isCustomDomainLocked = !canUse('custom_domain');

  return (
    <div className="space-y-6">
      {/* Header */}
      <div>
        <h2 className="text-2xl font-bold text-gray-900 dark:text-white flex items-center gap-3">
          <Globe className="text-indigo-500" />
          {t('settings.customDomains.title', 'Custom Domains')}
        </h2>
        <p className="text-gray-500 dark:text-gray-400 mt-1">
          Use your own domains for your booking pages.
        </p>
      </div>

      {/* Custom Domains Management - with overlay when locked */}
      <div className="relative">
        {isCustomDomainLocked && (
          <div className="absolute inset-0 z-10 bg-white/70 dark:bg-gray-900/70 backdrop-blur-[2px] rounded-xl flex items-center justify-center">
            <Link
              to="/settings/billing"
              className="inline-flex items-center gap-2 px-6 py-3 bg-gradient-to-r from-amber-500 to-orange-500 text-white font-semibold rounded-lg shadow-lg hover:from-amber-600 hover:to-orange-600 transition-all"
            >
              <Lock size={18} />
              Upgrade to Enable Custom Domains
              <ArrowUpRight size={18} />
            </Link>
          </div>
        )}
        <div className={isCustomDomainLocked ? 'pointer-events-none select-none' : ''}>
          <section className="bg-white dark:bg-gray-800 p-6 rounded-xl border border-gray-200 dark:border-gray-700 shadow-sm">
            <div className="flex items-center justify-between mb-4">
              <div>
                <h3 className="text-lg font-semibold text-gray-900 dark:text-white flex items-center gap-2">
                  <Globe size={20} className="text-indigo-500" />
                  Bring Your Own Domain
                </h3>
                <p className="text-sm text-gray-500 dark:text-gray-400 mt-1">
                  Connect a domain you already own
                </p>
              </div>
            </div>

            {/* Add New Domain Form */}
            <div className="mb-4 p-4 bg-gray-50 dark:bg-gray-900/50 rounded-lg border border-gray-200 dark:border-gray-700">
              <div className="flex gap-2">
                <input
                  type="text"
                  value={newDomain}
                  onChange={(e) => setNewDomain(e.target.value)}
                  placeholder="booking.yourdomain.com"
                  className="flex-1 px-4 py-2 border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700 text-gray-900 dark:text-white rounded-lg focus:ring-2 focus:ring-brand-500 font-mono text-sm"
                  onKeyPress={(e) => {
                    if (e.key === 'Enter') {
                      handleAddDomain();
                    }
                  }}
                />
                <button
                  onClick={handleAddDomain}
                  disabled={addDomainMutation.isPending || !newDomain.trim()}
                  className="px-4 py-2 bg-brand-600 text-white rounded-lg hover:bg-brand-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors font-medium text-sm"
                >
                  {addDomainMutation.isPending ? 'Adding...' : 'Add'}
                </button>
              </div>
            </div>

            {/* Custom Domains List */}
            {domainsLoading ? (
              <div className="text-center py-6 text-gray-500 dark:text-gray-400">
                Loading domains...
              </div>
            ) : customDomains.length === 0 ? (
              <div className="text-center py-6 text-gray-500 dark:text-gray-400">
                <Globe size={40} className="mx-auto mb-2 opacity-30" />
                <p className="text-sm">No custom domains yet. Add one above.</p>
              </div>
            ) : (
              <div className="space-y-3">
                {customDomains.map((domain: CustomDomain) => (
                  <div
                    key={domain.id}
                    className="border border-gray-200 dark:border-gray-700 rounded-lg p-4 bg-white dark:bg-gray-800"
                  >
                    <div className="flex items-start justify-between">
                      <div className="flex-1">
                        <div className="flex items-center gap-2 mb-1">
                          <h4 className="font-mono text-sm font-semibold text-gray-900 dark:text-white">
                            {domain.domain}
                          </h4>
                          {domain.is_primary && (
                            <span className="inline-flex items-center gap-1 px-1.5 py-0.5 text-[10px] font-medium bg-indigo-100 text-indigo-800 dark:bg-indigo-900/30 dark:text-indigo-300 rounded">
                              <Star size={10} className="fill-current" /> Primary
                            </span>
                          )}
                          {domain.is_verified ? (
                            <span className="inline-flex items-center gap-1 px-1.5 py-0.5 text-[10px] font-medium bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-300 rounded">
                              <CheckCircle size={10} /> Verified
                            </span>
                          ) : (
                            <span className="inline-flex items-center gap-1 px-1.5 py-0.5 text-[10px] font-medium bg-amber-100 text-amber-800 dark:bg-amber-900/30 dark:text-amber-300 rounded">
                              <AlertCircle size={10} /> Pending
                            </span>
                          )}
                        </div>

                        {!domain.is_verified && (
                          <div className="mt-2 p-2 bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-800 rounded text-xs">
                            <p className="font-medium text-amber-800 dark:text-amber-300 mb-1">Add DNS TXT record:</p>
                            <div className="space-y-1">
                              <div className="flex items-center gap-1">
                                <span className="text-amber-700 dark:text-amber-400">Name:</span>
                                <code className="px-1 bg-white dark:bg-gray-800 rounded text-gray-900 dark:text-white">{domain.dns_txt_record_name}</code>
                                <button onClick={() => navigator.clipboard.writeText(domain.dns_txt_record_name || '')} className="text-amber-600 hover:text-amber-700"><Copy size={12} /></button>
                              </div>
                              <div className="flex items-center gap-1">
                                <span className="text-amber-700 dark:text-amber-400">Value:</span>
                                <code className="px-1 bg-white dark:bg-gray-800 rounded text-gray-900 dark:text-white truncate max-w-[200px]">{domain.dns_txt_record}</code>
                                <button onClick={() => navigator.clipboard.writeText(domain.dns_txt_record || '')} className="text-amber-600 hover:text-amber-700"><Copy size={12} /></button>
                              </div>
                            </div>
                            {verifyError && verifyingDomainId === domain.id && (
                              <p className="mt-1 text-red-600 dark:text-red-400">{verifyError}</p>
                            )}
                          </div>
                        )}
                      </div>

                      <div className="flex items-center gap-1 ml-3">
                        {!domain.is_verified && (
                          <button
                            onClick={() => handleVerifyDomain(domain.id)}
                            disabled={verifyingDomainId === domain.id}
                            className="p-1.5 text-brand-600 dark:text-brand-400 hover:bg-brand-50 dark:hover:bg-brand-900/30 rounded transition-colors disabled:opacity-50"
                            title="Verify"
                          >
                            <RefreshCw size={16} className={verifyingDomainId === domain.id ? 'animate-spin' : ''} />
                          </button>
                        )}
                        {domain.is_verified && !domain.is_primary && (
                          <button
                            onClick={() => handleSetPrimary(domain.id)}
                            disabled={setPrimaryMutation.isPending}
                            className="p-1.5 text-indigo-600 dark:text-indigo-400 hover:bg-indigo-50 dark:hover:bg-indigo-900/30 rounded transition-colors"
                            title="Set as Primary"
                          >
                            <Star size={16} />
                          </button>
                        )}
                        <button
                          onClick={() => handleDeleteDomain(domain.id)}
                          disabled={deleteDomainMutation.isPending}
                          className="p-1.5 text-red-600 dark:text-red-400 hover:bg-red-50 dark:hover:bg-red-900/30 rounded transition-colors"
                          title="Delete"
                        >
                          <Trash2 size={16} />
                        </button>
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </section>

          {/* Domain Purchase */}
          <section className="bg-white dark:bg-gray-800 p-6 rounded-xl border border-gray-200 dark:border-gray-700 shadow-sm mt-6">
            <div className="flex items-center justify-between mb-4">
              <div>
                <h3 className="text-lg font-semibold text-gray-900 dark:text-white flex items-center gap-2">
                  <ShoppingCart size={20} className="text-green-500" />
                  Purchase a Domain
                </h3>
                <p className="text-sm text-gray-500 dark:text-gray-400 mt-1">
                  Search and register a new domain name
                </p>
              </div>
            </div>
            <DomainPurchase />
          </section>
        </div>
      </div>

      {/* Toast */}
      {showToast && (
        <div className="fixed bottom-4 right-4 flex items-center gap-2 px-4 py-3 bg-green-500 text-white rounded-lg shadow-lg">
          <CheckCircle size={18} />
          Changes saved successfully
        </div>
      )}
    </div>
  );
};

export default CustomDomainsSettings;