import { useState, useMemo } from 'react';
import { useTranslation } from 'react-i18next';
import { useWorkspaces, useCreateWorkspace, useUpdateWorkspace, useDeleteWorkspace, useSetWorkspaceModules, useAssignWorkspaceUser, useRemoveWorkspaceUser, type Workspace, type WorkspaceModule } from '@/api/hooks/workspaces';
import { usePluginStore } from '@/store/pluginStore';
import { LayoutGrid, Plus, Trash2, Edit, Users, Save, X, Check } from 'lucide-react';

// Static core menu items — same as Sidebar.tsx
const CORE_MENU_ITEMS = [
  { key: 'dashboard', label: 'Dashboard' },
  { key: 'contacts', label: 'Kontakte' },
];

export function WorkspaceManager() {
  const { t } = useTranslation();
  const { data: wsData } = useWorkspaces();
  const createWs = useCreateWorkspace();
  const updateWs = useUpdateWorkspace();
  const deleteWs = useDeleteWorkspace();
  const setModules = useSetWorkspaceModules();
  const manifests = usePluginStore(s => s.manifests);

  // Dynamically build available modules from core menu items + plugin manifests
  const availableModules = useMemo(() => {
    const pluginItems = manifests
      .flatMap(m => m.menu_items || [])
      .map(item => ({
        key: item.path.replace(/^\//, '').split('/')[0],
        label: item.label || item.label_key,
      }));
    // Merge core + plugin, deduplicate by key
    const seen = new Set<string>();
    return [...CORE_MENU_ITEMS, ...pluginItems].filter(m => {
      if (seen.has(m.key)) return false;
      seen.add(m.key);
      return true;
    });
  }, [manifests]);

  const [showCreate, setShowCreate] = useState(false);
  const [editingId, setEditingId] = useState<string | null>(null);
  const [editName, setEditName] = useState('');
  const [editDesc, setEditDesc] = useState('');
  const [editIcon, setEditIcon] = useState('LayoutGrid');
  const [editDefault, setEditDefault] = useState(false);

  const [moduleWsId, setModuleWsId] = useState<string | null>(null);
  const [moduleConfig, setModuleConfig] = useState<WorkspaceModule[]>([]);
  const [configEditingKey, setConfigEditingKey] = useState<string | null>(null);

  const workspaces = wsData?.items || [];

  const handleCreate = async () => {
    await createWs.mutateAsync({ name: editName, icon: editIcon, description: editDesc, is_default: editDefault });
    setShowCreate(false);
    setEditName(''); setEditDesc(''); setEditDefault(false);
  };

  const handleSaveEdit = async () => {
    if (!editingId) return;
    await updateWs.mutateAsync({ id: editingId, name: editName, description: editDesc, is_default: editDefault });
    setEditingId(null);
  };

  const handleDelete = async (id: string) => {
    if (confirm('Workspace wirklich löschen?')) {
      await deleteWs.mutateAsync(id);
    }
  };

  const openModuleEditor = (ws: Workspace) => {
    setModuleWsId(ws.id);
    const existing = ws.modules || [];
    setModuleConfig(availableModules.map(m => {
      const existingMod = existing.find(e => e.module_key === m.key);
      return {
        module_key: m.key,
        is_visible: existingMod?.is_visible ?? false,
        menu_order: existingMod?.menu_order ?? 0,
        config: existingMod?.config || {},
      };
    }));
  };

  const saveModules = async () => {
    if (!moduleWsId) return;
    await setModules.mutateAsync({ workspaceId: moduleWsId, modules: moduleConfig });
    setModuleWsId(null);
  };

  const toggleModule = (key: string) => {
    setModuleConfig(prev => prev.map(m =>
      m.module_key === key ? { ...m, is_visible: !m.is_visible } : m
    ));
  };

  return (
    <div className="space-y-4">
      <div className="flex items-center justify-between">
        <h2 className="text-lg font-semibold">{t('workspaces.title', 'Workspaces')}</h2>
        <button
          onClick={() => { setShowCreate(true); setEditName(''); setEditDesc(''); setEditDefault(false); }}
          className="flex items-center gap-1.5 px-3 py-1.5 bg-blue-600 text-white rounded-md hover:bg-blue-700 text-sm font-medium"
        >
          <Plus className="w-4 h-4" />
          {t('workspaces.create', 'Neuer Workspace')}
        </button>
      </div>

      {showCreate && (
        <div className="border border-gray-200 dark:border-gray-700 rounded-lg p-4 space-y-3 bg-gray-50 dark:bg-gray-800/50">
          <h3 className="font-medium">{t('workspaces.createNew', 'Neuen Workspace erstellen')}</h3>
          <input
            type="text"
            placeholder="Name"
            value={editName}
            onChange={e => setEditName(e.target.value)}
            className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-900 text-sm"
          />
          <input
            type="text"
            placeholder="Beschreibung"
            value={editDesc}
            onChange={e => setEditDesc(e.target.value)}
            className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-900 text-sm"
          />
          <label className="flex items-center gap-2 text-sm">
            <input type="checkbox" checked={editDefault} onChange={e => setEditDefault(e.target.checked)} />
            Als Standard-Workspace
          </label>
          <div className="flex gap-2">
            <button onClick={handleCreate} disabled={!editName} className="px-3 py-1.5 bg-blue-600 text-white rounded-md hover:bg-blue-700 text-sm font-medium disabled:opacity-50">
              <Save className="w-4 h-4 inline mr-1" />
              {t('common.save', 'Speichern')}
            </button>
            <button onClick={() => setShowCreate(false)} className="px-3 py-1.5 border border-gray-300 dark:border-gray-600 rounded-md text-sm">
              {t('common.cancel', 'Abbrechen')}
            </button>
          </div>
        </div>
      )}

      {moduleWsId && (
        <div className="border border-blue-200 dark:border-blue-800 rounded-lg p-4 space-y-3 bg-blue-50 dark:bg-blue-900/20">
          <div className="flex items-center justify-between">
            <h3 className="font-medium">{t('workspaces.moduleConfig', 'Module konfigurieren')}</h3>
            <div className="flex gap-2">
              <button onClick={saveModules} className="px-3 py-1.5 bg-blue-600 text-white rounded-md text-sm font-medium">
                <Save className="w-4 h-4 inline mr-1" />
                {t('common.save', 'Speichern')}
              </button>
              <button onClick={() => setModuleWsId(null)} className="px-3 py-1.5 border rounded-md text-sm">
                <X className="w-4 h-4 inline" />
              </button>
            </div>
          </div>
          <div className="grid grid-cols-2 md:grid-cols-3 gap-2">
            {moduleConfig.map(m => {
              const mod = availableModules.find(a => a.key === m.module_key);
              return (
                <div key={m.module_key} className={`p-2 border rounded-md ${m.is_visible ? 'border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-blue-900/10' : 'border-gray-200 dark:border-gray-700'}`}>
                  <label className="flex items-center gap-2 cursor-pointer hover:bg-gray-50 dark:hover:bg-gray-800 rounded p-1">
                    <input
                      type="checkbox"
                      checked={m.is_visible}
                      onChange={() => toggleModule(m.module_key)}
                    />
                    <span className="text-sm flex-1">{mod?.label || m.module_key}</span>
                    {m.is_visible && (
                      <button
                        onClick={(e) => { e.preventDefault(); setModuleConfig(prev => prev.map(x => x.module_key === m.module_key ? { ...x, config: x.config } : x)); setConfigEditingKey(configEditingKey === m.module_key ? null : m.module_key); }}
                        className="text-xs px-1.5 py-0.5 border rounded hover:bg-gray-100 dark:hover:bg-gray-700"
                        title="Konfiguration bearbeiten"
                      >
                        ⚙
                      </button>
                    )}
                  </label>
                  {m.is_visible && configEditingKey === m.module_key && (
                    <div className="mt-2 space-y-1">
                      <textarea
                        className="w-full text-xs font-mono p-1.5 border border-gray-300 dark:border-gray-600 rounded bg-white dark:bg-gray-900 h-20"
                        placeholder='{"visible_folder_ids": []}'
                        value={JSON.stringify(m.config || {}, null, 2)}
                        onChange={(e) => {
                          try {
                            const parsed = JSON.parse(e.target.value);
                            setModuleConfig(prev => prev.map(x => x.module_key === m.module_key ? { ...x, config: parsed } : x));
                          } catch {
                            // Invalid JSON — keep raw text for editing
                          }
                        }}
                      />
                      <p className="text-xs text-gray-400">JSON-Konfiguration für dieses Modul (z.B. sichtbare Ordner-IDs)</p>
                    </div>
                  )}
                </div>
              );
            })}
          </div>
        </div>
      )}

      <div className="space-y-2">
        {workspaces.length === 0 && (
          <p className="text-sm text-gray-500 dark:text-gray-400 py-4 text-center">
            {t('workspaces.empty', 'Keine Workspaces vorhanden. Erstellen Sie einen neuen Workspace.')}
          </p>
        )}
        {workspaces.map(ws => (
          <div key={ws.id} className="border border-gray-200 dark:border-gray-700 rounded-lg p-4">
            {editingId === ws.id ? (
              <div className="space-y-2">
                <input type="text" value={editName} onChange={e => setEditName(e.target.value)} className="w-full px-3 py-2 border rounded-md text-sm" />
                <input type="text" value={editDesc} onChange={e => setEditDesc(e.target.value)} className="w-full px-3 py-2 border rounded-md text-sm" placeholder="Beschreibung" />
                <label className="flex items-center gap-2 text-sm">
                  <input type="checkbox" checked={editDefault} onChange={e => setEditDefault(e.target.checked)} />
                  Standard
                </label>
                <div className="flex gap-2">
                  <button onClick={handleSaveEdit} className="px-3 py-1.5 bg-blue-600 text-white rounded-md text-sm">
                    <Check className="w-4 h-4 inline mr-1" />
                    Speichern
                  </button>
                  <button onClick={() => setEditingId(null)} className="px-3 py-1.5 border rounded-md text-sm">
                    Abbrechen
                  </button>
                </div>
              </div>
            ) : (
              <div className="flex items-start justify-between">
                <div className="flex items-start gap-3">
                  <LayoutGrid className="w-5 h-5 text-gray-400 mt-0.5" />
                  <div>
                    <div className="flex items-center gap-2">
                      <span className="font-medium">{ws.name}</span>
                      {ws.is_default && <span className="text-xs px-1.5 py-0.5 bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300 rounded">Standard</span>}
                    </div>
                    {ws.description && <p className="text-sm text-gray-500 dark:text-gray-400 mt-0.5">{ws.description}</p>}
                    <div className="flex items-center gap-3 mt-1 text-xs text-gray-400">
                      <span className="flex items-center gap-1"><Users className="w-3 h-3" /> {ws.user_count || 0} User</span>
                      <span>{ws.modules?.length || 0} Module</span>
                    </div>
                  </div>
                </div>
                <div className="flex items-center gap-1">
                  <button
                    onClick={() => openModuleEditor(ws)}
                    className="p-1.5 hover:bg-gray-100 dark:hover:bg-gray-800 rounded-md text-sm"
                    title="Module"
                  >
                    <LayoutGrid className="w-4 h-4" />
                  </button>
                  <button
                    onClick={() => { setEditingId(ws.id); setEditName(ws.name); setEditDesc(ws.description || ''); setEditDefault(ws.is_default); }}
                    className="p-1.5 hover:bg-gray-100 dark:hover:bg-gray-800 rounded-md text-sm"
                    title="Bearbeiten"
                  >
                    <Edit className="w-4 h-4" />
                  </button>
                  <button
                    onClick={() => handleDelete(ws.id)}
                    className="p-1.5 hover:bg-red-50 dark:hover:bg-red-900/20 rounded-md text-sm text-red-600"
                    title="Löschen"
                  >
                    <Trash2 className="w-4 h-4" />
                  </button>
                </div>
              </div>
            )}
          </div>
        ))}
      </div>
    </div>
  );
}