'use client';

import { useQuery } from '@tanstack/react-query';
import Link from 'next/link';
import type { ReactNode } from 'react';
import api from '@/lib/api';
import { useAuthStore } from '@/lib/store';
import type { Application } from '@/types';
import { Rocket, Package, Circle, Hexagon } from 'lucide-react';

const statusColors: Record<string, string> = {
  running: 'bg-emerald-100 text-emerald-700',
  pending: 'bg-amber-100 text-amber-700',
  building: 'bg-blue-100 text-blue-700',
  deploying: 'bg-blue-100 text-blue-700',
  failed: 'bg-red-100 text-red-700',
  build_failed: 'bg-red-100 text-red-700',
  stopped: 'bg-gray-100 text-gray-600',
};

const statusIcons: Record<string, ReactNode> = {
  running: <Circle className="w-3 h-3 fill-emerald-500 text-emerald-500" />,
  pending: <Circle className="w-3 h-3 fill-amber-500 text-amber-500" />,
  building: <Circle className="w-3 h-3 fill-blue-500 text-blue-500" />,
  deploying: <Circle className="w-3 h-3 fill-blue-500 text-blue-500" />,
  failed: <Circle className="w-3 h-3 fill-red-500 text-red-500" />,
  build_failed: <Circle className="w-3 h-3 fill-red-500 text-red-500" />,
  stopped: <Circle className="w-3 h-3 fill-gray-400 text-gray-400" />,
};

export default function DashboardPage() {
  const user = useAuthStore((s) => s.user);

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

  const runningApps = apps.filter(
    (a) => a.deployments?.some((d) => d.status === 'running'),
  );
  const failedApps = apps.filter(
    (a) => a.deployments?.some((d) => d.status === 'failed' || d.status === 'build_failed'),
  );

  return (
    <div className="space-y-8">
      {/* Welcome */}
      <div>
        <h1 className="page-title">
          Welcome back, {user?.firstName}!
        </h1>
        <p className="page-subtitle">
          Here&apos;s an overview of your applications.
        </p>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-2 lg:grid-cols-4 gap-4">
        <div className="stat-card">
          <div className="stat-label">Total Apps</div>
          <div className="stat-value text-gray-900">{isLoading ? '—' : apps.length}</div>
        </div>
        <div className="stat-card">
          <div className="stat-label">Running</div>
          <div className="stat-value text-emerald-600">{isLoading ? '—' : runningApps.length}</div>
        </div>
        <div className="stat-card">
          <div className="stat-label">Failed</div>
          <div className="stat-value text-red-600">{isLoading ? '—' : failedApps.length}</div>
        </div>
        <div className="stat-card">
          <div className="stat-label">Total Deploys</div>
          <div className="stat-value text-primary-600">
            {isLoading ? '—' : apps.reduce((sum, a) => sum + (a.deployments?.length || 0), 0)}
          </div>
        </div>
      </div>

      {/* Recent Applications */}
      <div>
        <div className="page-header mb-4">
          <h2 className="text-lg font-semibold text-gray-900">Recent Applications</h2>
          <Link href="/dashboard/deploy" className="btn-primary text-sm">
            <Rocket className="w-4 h-4 mr-1 inline" /> New Application
          </Link>
        </div>

        {isLoading ? (
          <div className="space-y-3">
            {[1, 2, 3].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-40" />
                  <div className="skeleton h-3 w-64" />
                </div>
                <div className="skeleton h-6 w-16 rounded-full" />
              </div>
            ))}
          </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">No applications yet</p>
            <p className="text-gray-400 mt-1 text-sm">
              Deploy your first application to get started.
            </p>
            <Link href="/dashboard/deploy" className="btn-primary mt-6 inline-flex items-center gap-1">
              <Rocket className="w-4 h-4" /> Deploy your first app
            </Link>
          </div>
        ) : (
          <div className="grid gap-3">
            {apps.slice(0, 5).map((app) => {
              const latestDeploy = app.deployments?.[0];
              const status = latestDeploy?.status || 'pending';
              return (
                <Link
                  key={app.id}
                  href={`/dashboard/apps/${app.id}`}
                  className="card-hover flex items-center justify-between group"
                >
                  <div className="flex items-center gap-4">
                    <div className="w-11 h-11 rounded-xl 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>
                    <div className="min-w-0">
                      <h3 className="font-semibold text-gray-900 group-hover:text-primary-700 transition-colors truncate">
                        {app.name}
                      </h3>
                      <p className="text-sm text-gray-500 truncate">
                        {app.runtime} · {app.replicas} replica{app.replicas > 1 ? 's' : ''}
                        {app.databaseType !== 'none' && ` · ${app.databaseType}`}
                      </p>
                    </div>
                  </div>
                  <div className="flex items-center gap-2 shrink-0">
                    {statusIcons[status]}
                    <span className={`badge ${statusColors[status] || 'badge-gray'}`}>
                      {status}
                    </span>
                  </div>
                </Link>
              );
            })}
            {apps.length > 5 && (
              <Link
                href="/dashboard/apps"
                className="text-center text-sm text-primary-600 hover:text-primary-700 font-medium py-3"
              >
                View all {apps.length} applications →
              </Link>
            )}
          </div>
        )}
      </div>
    </div>
  );
}