import { useState } from 'react';
import { useNavigate } from 'react-router';
import { useQuery } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';
import {
  partnerApi,
  type AdminPartnerItem,
  type AdminPartnerApplicationItem,
} from '../api/partners';
import { AdminBackButton } from '../components/admin';
import { useCurrency } from '../hooks/useCurrency';
import {
  BanknotesIcon,
  ChevronRightIcon,
  InboxIcon,
  PartnerIcon,
  SettingsIcon,
  UserPlusIcon,
} from '@/components/icons';
import { StatCard } from '@/components/stats';

export default function AdminPartners() {
  const { t } = useTranslation();
  const navigate = useNavigate();
  const { formatWithCurrency } = useCurrency();

  const [activeTab, setActiveTab] = useState<'partners' | 'applications'>('partners');

  // Queries
  const { data: stats } = useQuery({
    queryKey: ['admin-partner-stats'],
    queryFn: () => partnerApi.getStats(),
  });

  const { data: partnersData, isLoading: partnersLoading } = useQuery({
    queryKey: ['admin-partners'],
    queryFn: () => partnerApi.getPartners(),
  });

  const { data: applicationsData, isLoading: applicationsLoading } = useQuery({
    queryKey: ['admin-partner-applications'],
    queryFn: () => partnerApi.getApplications({ status: 'pending' }),
  });

  const partners = partnersData?.items || [];
  const applications = applicationsData?.items || [];

  return (
    <div className="animate-fade-in">
      {/* Header */}
      <div className="mb-6 flex items-center gap-3">
        <AdminBackButton to="/admin" />
        <div className="flex-1">
          <h1 className="text-xl font-semibold text-dark-100">{t('admin.partners.title')}</h1>
          <p className="text-sm text-dark-400">{t('admin.partners.subtitle')}</p>
        </div>
        <button
          onClick={() => navigate('/admin/partners/settings')}
          className="rounded-lg bg-dark-800 p-2 text-dark-400 transition-colors hover:bg-dark-700 hover:text-dark-200"
          title={t('admin.partners.settings')}
        >
          <SettingsIcon className="h-5 w-5" />
        </button>
      </div>

      {/* Stats Overview */}
      {stats && (
        <div className="mb-6 grid grid-cols-2 gap-3">
          <StatCard
            label={t('admin.partners.totalPartners')}
            value={stats.total_partners}
            icon={<PartnerIcon className="h-5 w-5" />}
            tone="neutral"
          />
          <StatCard
            label={t('admin.partners.pendingApplications')}
            value={stats.pending_applications}
            icon={<InboxIcon className="h-5 w-5" />}
            tone="accent"
          />
          <StatCard
            label={t('admin.partners.totalReferrals')}
            value={stats.total_referrals}
            icon={<UserPlusIcon className="h-5 w-5" />}
            tone="neutral"
          />
          <StatCard
            label={t('admin.partners.totalEarnings')}
            value={formatWithCurrency(stats.total_earnings_kopeks / 100)}
            icon={<BanknotesIcon className="h-5 w-5" />}
            tone="success"
          />
        </div>
      )}

      {/* Tabs */}
      <div className="mb-4 flex gap-1 rounded-lg border border-dark-700 bg-dark-800/40 p-1">
        <button
          onClick={() => setActiveTab('partners')}
          className={`flex-1 rounded-md px-4 py-2 text-sm font-medium transition-colors ${
            activeTab === 'partners'
              ? 'bg-dark-700 text-dark-100'
              : 'text-dark-400 hover:text-dark-200'
          }`}
        >
          {t('admin.partners.tabs.partners')}
        </button>
        <button
          onClick={() => setActiveTab('applications')}
          className={`flex-1 rounded-md px-4 py-2 text-sm font-medium transition-colors ${
            activeTab === 'applications'
              ? 'bg-dark-700 text-dark-100'
              : 'text-dark-400 hover:text-dark-200'
          }`}
        >
          {t('admin.partners.tabs.applications')}
          {applications.length > 0 && (
            <span className="ml-2 rounded-full bg-accent-500/20 px-2 py-0.5 text-xs text-accent-400">
              {applications.length}
            </span>
          )}
        </button>
      </div>

      {/* Partners Tab */}
      {activeTab === 'partners' && (
        <>
          {partnersLoading ? (
            <div className="flex items-center justify-center py-12">
              <div className="h-8 w-8 animate-spin rounded-full border-2 border-accent-500 border-t-transparent" />
            </div>
          ) : partners.length === 0 ? (
            <div className="py-12 text-center">
              <p className="text-dark-400">{t('admin.partners.noPartners')}</p>
            </div>
          ) : (
            <div className="space-y-3">
              {partners.map((partner: AdminPartnerItem) => (
                <button
                  key={partner.user_id}
                  onClick={() => navigate(`/admin/partners/${partner.user_id}`)}
                  className="w-full rounded-xl border border-dark-700 bg-dark-800 p-4 text-left transition-colors hover:border-dark-600"
                >
                  <div className="flex items-start justify-between gap-4">
                    <div className="min-w-0 flex-1">
                      <div className="mb-1 flex min-w-0 items-center gap-2">
                        <h3 className="truncate font-medium text-dark-100">
                          {partner.first_name || partner.username || `#${partner.user_id}`}
                        </h3>
                        {partner.username && (
                          <span className="shrink-0 text-sm text-dark-500">
                            @{partner.username}
                          </span>
                        )}
                      </div>
                      <div className="flex flex-wrap gap-x-4 gap-y-1 text-sm text-dark-400">
                        <span>
                          {t('admin.partners.commission', {
                            percent: partner.commission_percent ?? 0,
                          })}
                        </span>
                        <span>
                          {t('admin.partners.referrals', { count: partner.total_referrals })}
                        </span>
                        <span className="text-success-400">
                          {formatWithCurrency(partner.total_earnings_kopeks / 100)}
                        </span>
                      </div>
                    </div>
                    <ChevronRightIcon className="h-5 w-5 shrink-0 text-dark-500" />
                  </div>
                </button>
              ))}
            </div>
          )}
        </>
      )}

      {/* Applications Tab */}
      {activeTab === 'applications' && (
        <>
          {applicationsLoading ? (
            <div className="flex items-center justify-center py-12">
              <div className="h-8 w-8 animate-spin rounded-full border-2 border-accent-500 border-t-transparent" />
            </div>
          ) : applications.length === 0 ? (
            <div className="py-12 text-center">
              <p className="text-dark-400">{t('admin.partners.noApplications')}</p>
            </div>
          ) : (
            <div className="space-y-3">
              {applications.map((app: AdminPartnerApplicationItem) => (
                <div key={app.id} className="rounded-xl border border-dark-700 bg-dark-800 p-4">
                  <div className="mb-3 flex items-start justify-between gap-4">
                    <div className="min-w-0 flex-1">
                      <div className="mb-1 flex min-w-0 items-center gap-2">
                        <h3 className="truncate font-medium text-dark-100">
                          {app.first_name || app.username || `#${app.user_id}`}
                        </h3>
                        {app.username && (
                          <span className="shrink-0 text-sm text-dark-500">@{app.username}</span>
                        )}
                      </div>
                      {app.company_name && (
                        <div className="text-sm text-dark-300">{app.company_name}</div>
                      )}
                    </div>
                  </div>

                  {/* Application details */}
                  <div className="mb-3 space-y-1 text-sm text-dark-400">
                    {app.website_url && (
                      <div>
                        {t('admin.partners.applicationFields.website')}: {app.website_url}
                      </div>
                    )}
                    {app.telegram_channel && (
                      <div>
                        {t('admin.partners.applicationFields.channel')}: {app.telegram_channel}
                      </div>
                    )}
                    {app.description && (
                      <div>
                        {t('admin.partners.applicationFields.description')}: {app.description}
                      </div>
                    )}
                    {app.expected_monthly_referrals != null && (
                      <div>
                        {t('admin.partners.applicationFields.expectedReferrals')}:{' '}
                        {app.expected_monthly_referrals}
                      </div>
                    )}
                    {app.desired_commission_percent != null && (
                      <div>
                        {t('admin.partners.applicationFields.desiredCommission')}:{' '}
                        {app.desired_commission_percent}%
                      </div>
                    )}
                  </div>

                  {/* Actions */}
                  <div className="flex gap-2">
                    <button
                      onClick={() =>
                        navigate(`/admin/partners/applications/${app.id}/review`, {
                          state: { application: app },
                        })
                      }
                      className="flex-1 rounded-lg bg-accent-500/20 px-4 py-2 text-sm font-medium text-accent-400 transition-colors hover:bg-accent-500/30"
                    >
                      {t('admin.partners.actions.review')}
                    </button>
                  </div>
                </div>
              ))}
            </div>
          )}
        </>
      )}
    </div>
  );
}