'use client';

import { useEffect, useState } from 'react';
import {
  ImagePlus,
  Maximize,
  Eraser,
  Film,
  Captions,
  Volume2,
  Type,
  Wand2,
  FileText,
  TrendingUp,
  Clock,
  CheckCircle,
} from 'lucide-react';
import { useRouter } from 'next/navigation';
import { toast } from 'react-hot-toast';
import ModuleCard from '@/components/ModuleCard';
import { useStore } from '@/lib/store';
import { jobsApi, usersApi } from '@/lib/api';

const modules = [
  {
    title: 'Image Generator',
    description: 'Create stunning images with AI using multiple providers',
    icon: ImagePlus,
    href: '/image/generate',
  },
  {
    title: 'Image Upscaler',
    description: 'Enhance image resolution with Topaz Labs AI',
    icon: Maximize,
    href: '/image/upscale',
  },
  {
    title: 'Background Remover',
    description: 'Remove backgrounds instantly with precision',
    icon: Eraser,
    href: '/image/remove-bg',
  },
  {
    title: 'Video Generator',
    description: 'Generate videos with Runway and Google Veo',
    icon: Film,
    href: '/video/generate',
  },
  {
    title: 'Video Upscaler',
    description: 'Upscale videos to higher resolutions',
    icon: Maximize,
    href: '/video/upscale',
  },
  {
    title: 'Subtitle Generator',
    description: 'Auto-generate and translate subtitles',
    icon: Captions,
    href: '/video/subtitles',
  },
  {
    title: 'Text to Speech',
    description: 'Convert text to natural speech with ElevenLabs',
    icon: Volume2,
    href: '/audio/text-to-speech',
  },
  {
    title: 'Voice to Text',
    description: 'Transcribe audio with Whisper AI',
    icon: Type,
    href: '/audio/voice-to-text',
  },
  {
    title: 'Prompt Studio',
    description: 'Enhance your prompts with AI assistance',
    icon: Wand2,
    href: '/text/prompt-studio',
  },
  {
    title: 'Alt Text Generator',
    description: 'Generate accessible alt text for images',
    icon: FileText,
    href: '/text/alt-text',
  },
];

export default function Dashboard() {
  const router = useRouter();
  const { activeJobs } = useStore();
  const [stats, setStats] = useState({
    totalJobs: 0,
    completedToday: 0,
    processingTime: 0,
  });
  const [recentJobs, setRecentJobs] = useState<any[]>([]);
  const [dragTarget, setDragTarget] = useState<{ href: string, valid: boolean } | null>(null);

  useEffect(() => {
    const fetchData = async () => {
      try {
        const jobsResponse = await jobsApi.list({ limit: 5 });
        setRecentJobs(jobsResponse.data.items || []);

        // Calculate stats from recent jobs
        const completed = jobsResponse.data.items?.filter(
          (j: any) => j.status === 'completed'
        ).length || 0;
        setStats({
          totalJobs: jobsResponse.data.total || 0,
          completedToday: completed,
          processingTime: 2.4,
        });
      } catch (err) {
        console.error('Failed to fetch dashboard data:', err);
      }
    };

    fetchData();
  }, []);

  const validateDrop = (href: string, mimeType: string) => {
    if (href.startsWith('/image/')) return mimeType.startsWith('image/');
    if (href === '/video/upscale') return mimeType.startsWith('video/');
    if (href === '/video/subtitles') return mimeType.startsWith('video/');
    if (href === '/video/generate') return mimeType.startsWith('image/'); // Image to Video
    if (href === '/text/alt-text') return mimeType.startsWith('image/');
    if (href === '/audio/voice-to-text') return mimeType.startsWith('audio/') || mimeType.startsWith('video/');
    return false;
  };

  const handleDragOver = (e: React.DragEvent, href: string) => {
    e.preventDefault();
    if (e.dataTransfer.types.includes('application/json')) {
      // Only update state if different to prevent infinite re-renders
      if (dragTarget?.href !== href) {
        setDragTarget({ href, valid: true });
      }
    }
  };

  const handleDrop = (e: React.DragEvent, href: string) => {
    e.preventDefault();
    setDragTarget(null);

    const raw = e.dataTransfer.getData('application/json');
    if (!raw) return;

    try {
      const data = JSON.parse(raw);
      if (data.type === 'forge-asset') {
        if (validateDrop(href, data.mime_type || '')) {
          router.push(`${href}?assetId=${data.id}`);
          toast.success('File loaded into tool');
        } else {
          toast.error('Invalid file type for this tool');
        }
      }
    } catch (err) {
      console.error(err);
    }
  };

  return (
    <div className="space-y-8">
      {/* Stats Grid */}
      <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
        <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
          <div className="flex items-center gap-4">
            <div className="w-12 h-12 bg-forge-yellow/10 rounded-lg flex items-center justify-center">
              <TrendingUp className="w-6 h-6 text-forge-yellow" />
            </div>
            <div>
              <p className="text-gray-500 text-sm">Total Jobs</p>
              <p className="text-2xl font-bold text-white">{stats.totalJobs}</p>
            </div>
          </div>
        </div>

        <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
          <div className="flex items-center gap-4">
            <div className="w-12 h-12 bg-green-900/30 rounded-lg flex items-center justify-center">
              <CheckCircle className="w-6 h-6 text-green-400" />
            </div>
            <div>
              <p className="text-gray-500 text-sm">Completed Today</p>
              <p className="text-2xl font-bold text-white">{stats.completedToday}</p>
            </div>
          </div>
        </div>

        <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
          <div className="flex items-center gap-4">
            <div className="w-12 h-12 bg-blue-900/30 rounded-lg flex items-center justify-center">
              <Clock className="w-6 h-6 text-blue-400" />
            </div>
            <div>
              <p className="text-gray-500 text-sm">Avg. Processing Time</p>
              <p className="text-2xl font-bold text-white">{stats.processingTime}s</p>
            </div>
          </div>
        </div>
      </div>

      {/* Active Jobs */}
      {activeJobs.filter((j) => j.status === 'processing').length > 0 && (
        <div>
          <h2 className="text-lg font-semibold text-white mb-4">Active Jobs</h2>
          <div className="space-y-3">
            {activeJobs
              .filter((j) => j.status === 'processing')
              .map((job) => (
                <div
                  key={job.id}
                  className="bg-forge-dark rounded-xl p-4 border border-gray-800"
                >
                  <div className="flex items-center justify-between mb-2">
                    <span className="text-white font-medium capitalize">
                      {job.module.replace('_', ' ')}
                    </span>
                    <span className="text-gray-500 text-sm">{job.progress}%</span>
                  </div>
                  <div className="progress-bar">
                    <div
                      className="progress-bar-fill"
                      style={{ width: `${job.progress}%` }}
                    />
                  </div>
                </div>
              ))}
          </div>
        </div>
      )}

      {/* Modules Grid */}
      <div>
        <h2 className="text-lg font-semibold text-white mb-4">AI Tools</h2>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-6">
          {modules.map((module) => (
            <div
              key={module.href}
              onDragOver={(e) => handleDragOver(e, module.href)}
              onDragLeave={() => setDragTarget(null)}
              onDrop={(e) => handleDrop(e, module.href)}
              className={`transition-all rounded-xl h-full ${dragTarget?.href === module.href ? 'ring-2 ring-forge-yellow scale-105' : ''}`}
            >
              <ModuleCard {...module} />
            </div>
          ))}
        </div>
      </div>

      {/* Recent Jobs */}
      {recentJobs.length > 0 && (
        <div>
          <h2 className="text-lg font-semibold text-white mb-4">Recent Activity</h2>
          <div className="bg-forge-dark rounded-xl border border-gray-800 overflow-hidden">
            <table className="w-full">
              <thead>
                <tr className="border-b border-gray-800">
                  <th className="text-left px-6 py-4 text-sm font-medium text-gray-500">
                    Module
                  </th>
                  <th className="text-left px-6 py-4 text-sm font-medium text-gray-500">
                    Status
                  </th>
                  <th className="text-left px-6 py-4 text-sm font-medium text-gray-500">
                    Provider
                  </th>
                  <th className="text-left px-6 py-4 text-sm font-medium text-gray-500">
                    Created
                  </th>
                </tr>
              </thead>
              <tbody>
                {recentJobs.map((job: any) => (
                  <tr key={job.id} className="border-b border-gray-800 last:border-0">
                    <td className="px-6 py-4 text-white capitalize">
                      {job.module?.replace('_', ' ')}
                    </td>
                    <td className="px-6 py-4">
                      <span
                        className={`badge badge-${job.status}`}
                      >
                        {job.status}
                      </span>
                    </td>
                    <td className="px-6 py-4 text-gray-400">
                      {job.api_provider || '-'}
                    </td>
                    <td className="px-6 py-4 text-gray-500 text-sm">
                      {new Date(job.created_at).toLocaleString()}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        </div>
      )}
    </div>
  );
}