'use client';

import { useQuery } from '@tanstack/react-query';
import { Link } from '@/i18n/Link';
import { useT } from '@/i18n/I18nProvider';
import type { Dictionary } from '@/i18n/dictionaries/fa';
import api from '@/lib/api';
import type { Application } from '@/types';
import { Rocket, Package, Hexagon, Database, Box, AlertTriangle, Clock } from 'lucide-react';
import { useConfirm } from '@/components/confirm-modal';
import { DeleteButtonLabel } from '@/components/delete-button-label';
import {
  DeletingTableRowOverlay,
  deletingRowContentClass,
} from '@/components/deleting-overlay';
import { filterApplications } from '@/lib/product-type';
import { useApplicationDelete } from '@/lib/use-application-delete';
import {
  deploymentStatusBadgeClass,
  deploymentStatusLabel,
  lifecycleStatusClass,
} from '@/lib/app-list-utils';

const statusColors = deploymentStatusBadgeClass;
const lifecycleColors = lifecycleStatusClass;

type AppsDict = Dictionary['dashboard']['apps'];

function statusLabel(status: string, t: Dictionary): string {
  return deploymentStatusLabel(status, t);
}

function lifecycleLabel(lifecycle: string, a: AppsDict): string {
  return (a.lifecycle as Record<string, string>)[lifecycle] ?? lifecycle;
}

function formatExpiry(expiresAt: string | undefined, a: AppsDict): { text: string; urgent: boolean } {
  if (!expiresAt) return { text: '—', urgent: false };
  const now = new Date();
  const exp = new Date(expiresAt);
  const diff = exp.getTime() - now.getTime();
  if (diff <= 0) return { text: a.expired, urgent: true };
  const hours = Math.floor(diff / 3600000);
  const days = Math.floor(hours / 24);
  if (days > 0)
    return {
      text: a.daysHours.replace('{d}', String(days)).replace('{h}', String(hours % 24)),
      urgent: days < 3,
    };
  if (hours > 0) return { text: a.hours.replace('{h}', String(hours)), urgent: hours < 6 };
  const mins = Math.floor(diff / 60000);
  return { text: a.mins.replace('{m}', String(mins)), urgent: true };
}

export default function AppsPage() {
  const t = useT();
  const a = t.dashboard.apps;
  const confirm = useConfirm();

  const { data: appsRaw = [], isLoading } = useQuery<Application[]>({
    queryKey: ['applications', 'application'],
    queryFn: () => api.get('/applications', { params: { productType: 'application' } }).then((r) => r.data),
  });
  const apps = filterApplications(appsRaw);

  const { deleteApplication, isDeleting, isAnyDeleting } = useApplicationDelete({
    invalidateKeys: [['applications', 'application'], ['applications']],
    successMessage: a.deleted,
    successWithCreditMessage: a.deletedWithCredit,
  });

  if (isLoading) {
    return (
      <div className="space-y-6">
        <div className="page-header">
          <div className="skeleton h-8 w-48" />
          <div className="skeleton h-10 w-40 rounded-xl" />
        </div>
        <div className="space-y-3">
          {[1, 2, 3, 4].map((i) => (
            <div key={i} className="card flex items-center gap-4">
              <div className="skeleton w-11 h-11 rounded-xl" />
              <div className="flex-1 space-y-2">
                <div className="skeleton h-4 w-36" />
                <div className="skeleton h-3 w-56" />
              </div>
              <div className="skeleton h-6 w-20 rounded-full" />
            </div>
          ))}
        </div>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      <div className="page-header">
        <div>
          <h1 className="page-title">{a.title}</h1>
          <p className="page-subtitle">{a.count.replace('{n}', String(apps.length))}</p>
        </div>
        <Link href="/dashboard/deploy" className="btn-primary">
          <Rocket className="w-4 h-4 mr-1 rtl:mr-0 rtl:ml-1 inline" /> {a.newApplication}
        </Link>
      </div>

      {apps.length === 0 ? (
        <div className="card text-center py-16">
          <Package className="w-12 h-12 mx-auto mb-4 text-gray-300" />
          <p className="text-gray-600 text-lg font-medium">{a.noApplications}</p>
          <p className="text-gray-400 mt-1 text-sm">{a.emptyDesc}</p>
          <Link href="/dashboard/deploy" className="btn-primary mt-6 inline-flex items-center gap-1">
            <Rocket className="w-4 h-4" /> {a.deployFirst}
          </Link>
        </div>
      ) : (
        <>
          <div className="hidden md:block table-wrapper">
            <table className="min-w-full divide-y divide-gray-200">
              <thead className="bg-gray-50/80">
                <tr>
                  <th className="px-6 py-3.5 text-left rtl:text-right text-xs font-semibold text-gray-500 uppercase tracking-wider min-w-[300px]">{a.colApplication}</th>
                  <th className="px-6 py-3.5 text-left rtl:text-right text-xs font-semibold text-gray-500 uppercase tracking-wider">{a.colRuntime}</th>
                  <th className="px-6 py-3.5 text-left rtl:text-right text-xs font-semibold text-gray-500 uppercase tracking-wider">{a.colStatus}</th>
                  <th className="px-6 py-3.5 text-left rtl:text-right text-xs font-semibold text-gray-500 uppercase tracking-wider">{a.colServiceStatus}</th>
                  <th className="px-6 py-3.5 text-left rtl:text-right text-xs font-semibold text-gray-500 uppercase tracking-wider">{a.colExpiry}</th>
                  <th className="px-6 py-3.5 text-right rtl:text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">{a.colActions}</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-gray-100">
                {apps.map((app) => {
                  const latestStatus = app.deployments?.[0]?.status || 'pending';
                  const lifecycle = app.lifecycleStatus || 'active';
                  const expiry = formatExpiry(app.planExpiresAt, a);
                  const rowDeleting = isDeleting(app.id);
                  return (
                    <tr
                      key={app.id}
                      className={`hover:bg-gray-50/50 transition-colors ${lifecycle === 'suspended' ? 'bg-amber-50/30' : lifecycle === 'pending_deletion' ? 'bg-red-50/30' : ''} ${rowDeleting ? 'relative bg-gray-50/80' : ''}`}
                    >
                      <td className={`px-6 py-4 min-w-[300px] ${rowDeleting ? deletingRowContentClass : ''}`}>
                        <Link href={`/dashboard/apps/${app.id}`} className="flex items-center gap-3 group min-w-[300px]">
                          <div className="w-9 h-9 rounded-lg bg-primary-50 flex items-center justify-center shrink-0">
                            <Hexagon className={`w-5 h-5 ${app.runtime === 'nodejs' ? 'text-green-600' : app.runtime === 'wordpress' ? 'text-blue-600' : 'text-orange-500'}`} />
                          </div>
                          <span className="font-semibold text-gray-900 group-hover:text-primary-600 transition-colors">{app.name}</span>
                        </Link>
                      </td>
                      <td className={`px-6 py-4 text-sm text-gray-600 capitalize ${rowDeleting ? deletingRowContentClass : ''}`}>{app.runtime}</td>
                      <td className={`px-6 py-4 ${rowDeleting ? deletingRowContentClass : ''}`}>
                        <span className={`badge ${statusColors[latestStatus] || 'badge-gray'}`}>{statusLabel(latestStatus, t)}</span>
                      </td>
                      <td className={`px-6 py-4 ${rowDeleting ? deletingRowContentClass : ''}`}>
                        <span className={`inline-flex items-center gap-1 px-2 py-1 rounded-full text-xs font-semibold ${lifecycleColors[lifecycle] || 'text-gray-500 bg-gray-100'}`}>
                          {lifecycle === 'suspended' && <AlertTriangle className="w-3 h-3" />}
                          {lifecycleLabel(lifecycle, a)}
                        </span>
                      </td>
                      <td className={`px-6 py-4 ${rowDeleting ? deletingRowContentClass : ''}`}>
                        {app.planExpiresAt ? (
                          <span className={`inline-flex items-center gap-1 text-xs font-medium ${expiry.urgent ? 'text-red-600' : 'text-gray-600'}`}>
                            <Clock className="w-3 h-3" />
                            {expiry.text}
                          </span>
                        ) : (
                          <span className="text-xs text-gray-400">{a.noPlan}</span>
                        )}
                      </td>
                      <td className={`px-6 py-4 text-right rtl:text-left ${rowDeleting ? deletingRowContentClass : ''}`}>
                        <div className="flex items-center justify-end gap-2">
                          <Link href={`/dashboard/apps/${app.id}`} className="btn-ghost text-xs px-3 py-1.5">
                            {a.view}
                          </Link>
                          <button
                            type="button"
                            disabled={isAnyDeleting}
                            onClick={async () => {
                              const ok = await confirm({
                                title: a.deleteTitle,
                                message: a.deleteMessage.replace('{name}', app.name),
                                confirmText: t.common.delete,
                                variant: 'danger',
                              });
                              if (ok) deleteApplication(app.id);
                            }}
                            className="text-xs px-3 py-1.5 rounded-lg text-red-600 hover:bg-red-50 transition-colors disabled:opacity-50 disabled:pointer-events-none"
                          >
                            <DeleteButtonLabel loading={isDeleting(app.id)} />
                          </button>
                        </div>
                      </td>
                      {rowDeleting && (
                        <DeletingTableRowOverlay
                          colSpan={6}
                          name={app.name}
                          kind="application"
                        />
                      )}
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>

          <div className="md:hidden grid gap-3">
            {apps.map((app) => {
              const latestStatus = app.deployments?.[0]?.status || 'pending';
              const lifecycle = app.lifecycleStatus || 'active';
              const expiry = formatExpiry(app.planExpiresAt, a);
              return (
                <Link
                  key={app.id}
                  href={`/dashboard/apps/${app.id}`}
                  className={`card-hover ${lifecycle === 'suspended' ? 'border-l-4 border-l-amber-400' : lifecycle === 'pending_deletion' ? 'border-l-4 border-l-red-400' : ''}`}
                >
                  <div className="flex items-center justify-between mb-3">
                    <div className="flex items-center gap-3">
                      <div className="w-10 h-10 rounded-xl bg-primary-50 flex items-center justify-center">
                        <Hexagon className={`w-5 h-5 ${app.runtime === 'nodejs' ? 'text-green-600' : app.runtime === 'wordpress' ? 'text-blue-600' : 'text-orange-500'}`} />
                      </div>
                      <div>
                        <h3 className="font-semibold text-gray-900">{app.name}</h3>
                        <p className="text-xs text-gray-500 capitalize">{app.runtime}</p>
                      </div>
                    </div>
                    <span className={`badge ${statusColors[latestStatus] || 'badge-gray'}`}>{statusLabel(latestStatus, t)}</span>
                  </div>
                  <div className="flex items-center gap-3 mb-2">
                    <span className={`inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs font-semibold ${lifecycleColors[lifecycle] || 'text-gray-500 bg-gray-100'}`}>
                      {lifecycle === 'suspended' && <AlertTriangle className="w-3 h-3" />}
                      {lifecycleLabel(lifecycle, a)}
                    </span>
                    {app.planExpiresAt && (
                      <span className={`inline-flex items-center gap-1 text-xs ${expiry.urgent ? 'text-red-600 font-semibold' : 'text-gray-500'}`}>
                        <Clock className="w-3 h-3" />
                        {expiry.text}
                      </span>
                    )}
                  </div>
                  <div className="flex items-center gap-4 text-xs text-gray-500">
                    <span className="flex items-center gap-1">
                      <Database className="w-3 h-3" /> {app.databaseType}
                    </span>
                    <span className="flex items-center gap-1">
                      <Box className="w-3 h-3" /> {app.replicas} {app.replicas > 1 ? t.dashboard.home.replicaPlural : t.dashboard.home.replica}
                    </span>
                  </div>
                </Link>
              );
            })}
          </div>
        </>
      )}
    </div>
  );
}