import { useEffect, useState } from 'react';
import { useAuthStore } from '../store/authStore';
import { useNavigate, Link } from 'react-router-dom';
import { LogOut, Plus, Folder, Loader2, Trash2, Settings, Sparkles } from 'lucide-react';
import { DashboardSettings } from '../components/DashboardSettings';
import { api } from '../lib/api';

interface Project {
  id: string;
  name: string;
  created_at: string;
}

export default function Dashboard() {
  const { user, profile, signOut } = useAuthStore();
  const navigate = useNavigate();
  const [projects, setProjects] = useState<Project[]>([]);
  const [loading, setLoading] = useState(true);
  const [isSettingsOpen, setIsSettingsOpen] = useState(false);

  useEffect(() => {
    const fetchProjects = async () => {
      if (!user) return;
      try {
        const data = await api.getProjects();
        setProjects(data.projects || []);
      } catch (error) {
        console.error(error);
      }
      setLoading(false);
    };
    
    fetchProjects();
  }, [user]);

  const handleDeleteProject = async (e: React.MouseEvent, id: string) => {
    e.stopPropagation(); // prevent navigating to editor
    if (!confirm('Are you sure you want to delete this project?')) return;
    try {
      await api.deleteProject(id);
      setProjects(projects.filter(p => p.id !== id));
    } catch (err) {
      console.error('Error deleting project:', err);
      alert('Failed to delete project');
    }
  };

  const handleNewProject = async () => {
    const name = prompt('Enter a name for the new project:');
    if (!name || name.trim() === '') return;
    
    try {
      const res = await api.saveProject({
        name: name.trim(),
        scene_data: {}
      });
      if (res.id) {
        navigate(`/editor/${res.id}`);
      }
    } catch (err) {
      console.error('Failed to create project', err);
      alert('Failed to create project');
    }
  };

  const handleSignOut = async () => {
    await signOut();
    navigate('/');
  };

  const createNewProject = () => {
    navigate('/editor/new');
  };

  return (
    <div className="min-h-screen bg-zinc-950 text-white flex flex-col">
      <header className="h-16 border-b border-zinc-800 bg-zinc-900 flex items-center justify-between px-8">
        <div className="font-bold text-lg tracking-tight">Titan<span className="text-primary">3d</span> / Dashboard</div>
        <div className="flex items-center gap-4">
          {profile?.role === 'admin' && (
            <Link to="/admin" className="text-sm text-primary hover:underline font-medium">Admin Panel</Link>
          )}
          <div className="text-sm text-zinc-400">{user?.email}</div>
          <button 
            onClick={() => setIsSettingsOpen(true)}
            className="p-2 text-zinc-400 hover:text-white hover:bg-zinc-800 rounded-lg transition-colors"
            title="Global Settings"
          >
            <Settings size={18} />
          </button>
          <button 
            onClick={handleSignOut}
            className="p-2 text-zinc-400 hover:text-white hover:bg-zinc-800 rounded-lg transition-colors"
            title="Sign Out"
          >
            <LogOut size={18} />
          </button>
        </div>
      </header>

      <main className="flex-1 p-8 max-w-6xl mx-auto w-full">
        <div className="grid grid-cols-1 md:grid-cols-3 gap-6 mb-12">
           <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
              <h3 className="text-zinc-400 text-sm font-medium mb-2">AI Credits</h3>
              <div className="text-3xl font-bold text-white">{profile?.api_credits ?? 0}</div>
           </div>
           <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
              <h3 className="text-zinc-400 text-sm font-medium mb-2">Storage Usage</h3>
              <div className="text-3xl font-bold text-white">0 / {profile?.storage_limit_mb ?? 100} MB</div>
           </div>
           <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
              <h3 className="text-zinc-400 text-sm font-medium mb-2">Total Projects</h3>
              <div className="text-3xl font-bold text-white">{projects.length}</div>
           </div>
        </div>

        <div className="flex items-center justify-between mb-6">
          <h2 className="text-2xl font-bold">Your Projects</h2>
          <button 
            onClick={handleNewProject}
            className="flex items-center gap-2 bg-primary hover:bg-primary/90 text-white px-4 py-2 rounded-xl transition-colors font-medium text-sm"
          >
            <Plus size={16} /> New Project
          </button>
        </div>

        {loading ? (
           <div className="flex justify-center p-12">
             <Loader2 size={32} className="animate-spin text-zinc-500" />
           </div>
        ) : (
          <div className="grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-6">
             <div className="aspect-video bg-zinc-900 border border-zinc-800 border-dashed rounded-2xl flex flex-col items-center justify-center text-zinc-500 hover:text-white hover:border-zinc-700 transition-colors cursor-pointer group" onClick={createNewProject}>
               <div className="w-10 h-10 rounded-full bg-zinc-800 group-hover:bg-zinc-700 flex items-center justify-center mb-2 transition-colors">
                 <Plus size={20} />
               </div>
               <span className="text-sm font-medium">Create Blank Scene</span>
             </div>

             <div className="aspect-video bg-gradient-to-br from-amber-500/20 to-purple-500/20 border border-zinc-800 border-dashed rounded-2xl flex flex-col items-center justify-center text-zinc-400 hover:text-white hover:border-amber-500/50 transition-colors cursor-pointer group" onClick={() => navigate('/spark-plug')}>
               <div className="w-10 h-10 rounded-full bg-zinc-800 group-hover:bg-amber-500/20 flex items-center justify-center mb-2 transition-colors text-amber-500">
                 <Sparkles size={20} />
               </div>
               <span className="text-sm font-medium text-amber-500/80 group-hover:text-amber-400 transition-colors">Spark Plug (PDF to 3D)</span>
             </div>
             
             {projects.map(project => (
               <div key={project.id} onClick={() => navigate(`/editor/${project.id}`)} className="aspect-video bg-zinc-900 border border-zinc-800 rounded-2xl p-4 flex flex-col cursor-pointer hover:border-zinc-700 transition-colors group relative overflow-hidden">
                 <div className="absolute top-0 left-0 w-full h-1 bg-gradient-to-r from-transparent via-primary/50 to-transparent opacity-0 group-hover:opacity-100 transition-opacity" />
                 <div className="flex-1 flex items-center justify-center">
                   <Folder size={48} className="text-zinc-800 group-hover:text-zinc-700 transition-colors" />
                 </div>
                 <div>
                   <h3 className="font-semibold text-white truncate">{project.name}</h3>
                   <p className="text-xs text-zinc-500 mt-1">{new Date(project.created_at).toLocaleDateString()}</p>
                 </div>
                 <button 
                  onClick={(e) => handleDeleteProject(e, project.id)}
                  className="absolute top-4 right-4 p-2 text-zinc-500 hover:text-red-500 bg-zinc-900/80 rounded-lg opacity-0 group-hover:opacity-100 transition-all hover:bg-zinc-800"
                  title="Delete Project"
                >
                  <Trash2 size={16} />
                </button>
               </div>
             ))}
          </div>
        )}
      </main>

      <DashboardSettings isOpen={isSettingsOpen} onClose={() => setIsSettingsOpen(false)} />
    </div>
  );
}