import { Plus, FolderOpen, Layout, Layers, Settings, Trash2, Minus, Square, X } from 'lucide-react';
import { useAppStore } from '../store';
import { useRef, useState, useEffect } from 'react';
import { invoke } from '@tauri-apps/api/core';
import { getCurrentWindow } from '@tauri-apps/api/window';

const appWindow = getCurrentWindow();

interface ProjectEntry { id: string; title: string; element_count: number; saved_at: number; }

export const StarterHub = () => {
  const { setCurrentScreen, setIsSettingsOpen, setImages, setTextNotes, setAnnotations, setPalettes, setZoom, setPan, setActiveProjectId, setBoardTitle } = useAppStore();
  const [projects, setProjects] = useState<ProjectEntry[]>([]);
  const fileInputRef = useRef<HTMLInputElement>(null);

  const loadProjects = () => invoke<ProjectEntry[]>('projects_list').then(setProjects).catch(() => {});
  useEffect(() => { loadProjects(); }, []);

  const handleOpenFile = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;
    const reader = new FileReader();
    reader.onload = (ev) => {
      try {
        const d = JSON.parse(ev.target?.result as string);
        if (d.images) setImages(d.images);
        if (d.textNotes) setTextNotes(d.textNotes);
        if (d.annotations) setAnnotations(d.annotations);
        if (d.palettes) setPalettes(d.palettes);
        if (d.zoom) setZoom(d.zoom);
        if (d.pan) setPan(d.pan);
        if (d.title) setBoardTitle(d.title);
        setCurrentScreen('board');
      } catch {}
    };
    reader.readAsText(file);
    if (e.target) e.target.value = '';
  };

  const handleNewBoard = async () => {
    try {
      const entry = await invoke<any>('project_create', { title: null });
      setActiveProjectId(entry.id);
      setBoardTitle(entry.title);
    } catch {}
    setImages([]); setTextNotes([]); setAnnotations([]); setPalettes([]);
    setZoom(1); setPan({ x: 0, y: 0 });
    setCurrentScreen('board');
  };

  const handleOpenProject = async (project: ProjectEntry) => {
    try {
      const json = await invoke<string>('project_load', { id: project.id });
      const d = JSON.parse(json);
      setImages(d.images || []); setTextNotes(d.textNotes || []); setAnnotations(d.annotations || []); setPalettes(d.palettes || []);
      setZoom(d.zoom || 1); setPan(d.pan || { x: 0, y: 0 });
      setBoardTitle(d.title || project.title);
      setActiveProjectId(project.id);
    } catch {
      setImages([]); setTextNotes([]); setAnnotations([]); setPalettes([]); setZoom(1); setPan({ x: 0, y: 0 });
      setBoardTitle(project.title); setActiveProjectId(project.id);
    }
    setCurrentScreen('board');
  };

  const handleDeleteProject = async (id: string, e: React.MouseEvent) => {
    e.stopPropagation();
    try { await invoke('project_delete', { id }); } catch {}
    loadProjects();
  };

  const timeAgo = (ts: number) => {
    const diff = Math.floor(Date.now() / 1000) - ts;
    if (diff < 60) return 'Just now';
    if (diff < 3600) return `${Math.floor(diff / 60)}m ago`;
    if (diff < 86400) return `${Math.floor(diff / 3600)}h ago`;
    if (diff < 604800) return `${Math.floor(diff / 86400)}d ago`;
    return new Date(ts * 1000).toLocaleDateString();
  };

  return (
    <div className="w-screen h-screen bg-[#0A0A0B] flex flex-col font-sans text-white select-none overflow-hidden">
      {/* Top bar */}
      <div className="w-full h-12 flex items-center justify-between px-5 bg-[#0A0A0B] shrink-0 z-10 border-b border-white/[0.04]" data-tauri-drag-region>
        {/* Left: Logo */}
        <div className="flex items-center gap-2.5">
          <div className="w-[22px] h-[22px] bg-white rounded-[5px] flex items-center justify-center text-black">
            <Layout size={11} />
          </div>
          <span className="font-semibold text-[12px] text-white/80 tracking-tight">Refstudio</span>
        </div>

        {/* Right: Settings + Window controls */}
        <div className="flex items-center gap-1">
          <button onClick={() => setIsSettingsOpen(true)} className="w-7 h-7 rounded-md flex items-center justify-center text-white/30 hover:text-white/70 hover:bg-white/5 transition-colors" title="Settings">
            <Settings size={14} />
          </button>
          <div className="w-px h-4 bg-white/[0.06] mx-1" />
          <button onClick={() => appWindow.minimize()} className="w-7 h-7 rounded-md flex items-center justify-center text-white/30 hover:text-white/70 hover:bg-white/5 transition-colors">
            <Minus size={14} />
          </button>
          <button onClick={() => appWindow.toggleMaximize()} className="w-7 h-7 rounded-md flex items-center justify-center text-white/30 hover:text-white/70 hover:bg-white/5 transition-colors">
            <Square size={11} />
          </button>
          <button onClick={() => appWindow.close()} className="w-7 h-7 rounded-md flex items-center justify-center text-white/30 hover:text-[#FF453A] hover:bg-[#FF453A]/10 transition-colors">
            <X size={14} />
          </button>
        </div>
      </div>

      {/* Content */}
      <div className="flex-1 flex flex-col items-center pt-14 pb-12 px-8 overflow-y-auto">
        {/* Action buttons */}
        <div className="flex gap-3 mb-10 w-full max-w-md">
          <button onClick={handleNewBoard} className="flex-1 h-[72px] rounded-xl bg-[#141415] border border-white/[0.06] hover:border-[#0A84FF]/30 flex items-center gap-3 px-5 transition-all group">
            <div className="w-8 h-8 rounded-full bg-white/[0.04] group-hover:bg-[#0A84FF] flex items-center justify-center text-white/50 group-hover:text-white transition-colors shrink-0">
              <Plus size={15} />
            </div>
            <span className="text-[13px] text-white/70 font-medium">New Board</span>
          </button>
          <button onClick={() => fileInputRef.current?.click()} className="flex-1 h-[72px] rounded-xl bg-[#141415] border border-white/[0.06] hover:border-white/15 flex items-center gap-3 px-5 transition-all group">
            <div className="w-8 h-8 rounded-full bg-white/[0.04] group-hover:bg-white group-hover:text-black flex items-center justify-center text-white/50 transition-colors shrink-0">
              <FolderOpen size={15} />
            </div>
            <span className="text-[13px] text-white/70 font-medium">Open File</span>
          </button>
          <input type="file" accept=".json" className="hidden" ref={fileInputRef} onChange={handleOpenFile} />
        </div>

        {/* Recent projects */}
        <div className="w-full max-w-md">
          <div className="flex items-center justify-between mb-3 px-1">
            <span className="text-[11px] font-medium text-white/25 uppercase tracking-wider">Recent</span>
          </div>

          {projects.length === 0 ? (
            <div className="flex flex-col items-center justify-center py-16 text-white/20">
              <Layers size={22} className="mb-2.5 opacity-50" />
              <p className="text-[12px] font-medium">No projects yet</p>
            </div>
          ) : (
            <div className="flex flex-col gap-1">
              {projects.map(p => (
                <button key={p.id} onClick={() => handleOpenProject(p)} className="group w-full flex items-center gap-3 px-3.5 py-3 rounded-lg hover:bg-white/[0.03] transition-colors text-left">
                  <div className="w-8 h-8 rounded-lg bg-white/[0.04] flex items-center justify-center text-white/20 shrink-0">
                    <Layers size={13} />
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="text-[13px] font-medium text-white/80 truncate">{p.title}</div>
                    <div className="text-[10px] text-white/25 mt-0.5">{p.element_count} elements · {timeAgo(p.saved_at)}</div>
                  </div>
                  <button onClick={(e) => handleDeleteProject(p.id, e)} className="w-6 h-6 rounded flex items-center justify-center text-white/10 hover:text-[#FF453A] hover:bg-[#FF453A]/10 opacity-0 group-hover:opacity-100 transition-all shrink-0">
                    <Trash2 size={12} />
                  </button>
                </button>
              ))}
            </div>
          )}
        </div>
      </div>
    </div>
  );
};