"use client";
 
import React, { useState, useEffect, useCallback } from 'react';
import { FileDocument, FolderDocument } from '@/types';
import { FileExplorer } from './file-explorer';
import { MultiTabEditor } from './editor/multi-tab-editor';
import { ProjectGenerator } from './ai/project-generator';
import { SmartEditor } from './ai/smart-editor';
import { PromptSystem } from './ai/prompt-system';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import {
  ResizableHandle,
  ResizablePanel,
  ResizablePanelGroup,
} from '@/components/ui/resizable';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import {
  Dialog,
  DialogContent,
  // DialogDescription,
  // DialogHeader,
  // DialogTitle,
} from '@/components/ui/dialog';
import { 
  // Sidebar,
  // SidebarContent,
  // SidebarHeader,
  // SidebarProvider,
  // SidebarTrigger,
} from '@/components/ui/sidebar';
import { 
  Wand2, 
  // Brain,
  MessageSquare,
  Settings,
  Save,
  Download,
  Upload,
  RefreshCw,
  Maximize2,
  // Minimize2,
  Layout,
  // Code,
  Eye,
  Split,
  // Zap,
  // Sparkles,
  FileText,
  Folder,
  // Plus,
  // MoreHorizontal
} from 'lucide-react';
import { apiClient } from '@/lib/api';
import { toast } from 'sonner';

export interface EnhancedWorkspaceProps {
  projectId: string;
  initialFiles?: FileDocument[];
  initialFolders?: FolderDocument[];
  className?: string;
}

type PanelView = 'files' | 'ai-generator' | 'prompts' | 'settings';
type LayoutMode = 'default' | 'focus' | 'split' | 'preview';

export function EnhancedWorkspace({
  projectId,
  initialFiles = [],
  initialFolders = [],
  className = ""
}: EnhancedWorkspaceProps) {
  const [files, setFiles] = useState<FileDocument[]>(initialFiles);
  const [folders, setFolders] = useState<FolderDocument[]>(initialFolders);
  const [selectedFileId, setSelectedFileId] = useState<string | null>(null);
  const [selectedFile, setSelectedFile] = useState<FileDocument | null>(null);
  const [leftPanelView, setLeftPanelView] = useState<PanelView>('files');
  const [layoutMode, setLayoutMode] = useState<LayoutMode>('default');
  const [isGeneratorOpen, setIsGeneratorOpen] = useState(false);
  const [isLoading, setIsLoading] = useState(false);
  const [lastSaved, setLastSaved] = useState<Date | null>(null);
  const [unsavedChanges, setUnsavedChanges] = useState(0);

  // Load project data
  const loadProjectData = useCallback(async () => {
    setIsLoading(true);
    try {
      // Load files and folders
      const [filesResponse, foldersResponse] = await Promise.all([
        apiClient.getFiles(projectId),
        apiClient.getFolders(projectId, { tree: true })
      ]);

      const filesData = filesResponse.data as { ok?: boolean; files?: FileDocument[] } | FileDocument[];
      if (!Array.isArray(filesData)) {
        if (filesData.ok && filesData.files) {
          setFiles(filesData.files);
        }
      } else {
        setFiles(filesData);
      }

      const foldersData = foldersResponse.data as { ok?: boolean; tree?: FolderDocument[] } | FolderDocument[];
      if (!Array.isArray(foldersData)) {
        if (foldersData.ok && foldersData.tree) {
          setFolders(foldersData.tree);
        }
      } else {
        setFolders(foldersData);
      }
    } catch (error: unknown) {
      console.error('Error loading project data:', error);
      const message = (error as { message?: string })?.message || 'Failed to load project data';
      toast.error(message);
    } finally {
      setIsLoading(false);
    }
  }, [projectId]);

  // Initialize project data
  useEffect(() => {
    if (files.length === 0 && folders.length === 0) {
      loadProjectData();
    }
  }, [loadProjectData, files.length, folders.length]);

  // Handle file selection
  const handleFileSelect = useCallback((file: FileDocument) => {
    setSelectedFileId(file._id);
    setSelectedFile(file);
  }, []);

  // Handle file creation
  const handleFileCreate = useCallback((file: FileDocument) => {
    setFiles(prev => [...prev, file]);
    setSelectedFileId(file._id);
    setSelectedFile(file);
    toast.success(`File "${file.name}" created`);
  }, []);

  // Handle file update
  const handleFileUpdate = useCallback((updatedFile: FileDocument) => {
    setFiles(prev => prev.map(f => f._id === updatedFile._id ? updatedFile : f));
    if (selectedFile?._id === updatedFile._id) {
      setSelectedFile(updatedFile);
    }
    setLastSaved(new Date());
  }, [selectedFile]);

  // Handle file deletion
  const handleFileDelete = useCallback((fileId: string) => {
    setFiles(prev => prev.filter(f => f._id !== fileId));
    if (selectedFileId === fileId) {
      setSelectedFileId(null);
      setSelectedFile(null);
    }
    toast.success('File deleted');
  }, [selectedFileId]);

  // Handle folder creation
  const handleFolderCreate = useCallback((folder: FolderDocument) => {
    setFolders(prev => [...prev, folder]);
    toast.success(`Folder "${folder.name}" created`);
  }, []);

  // Handle project generation
  const handleProjectGenerated = useCallback((newFiles: FileDocument[], newFolders: FolderDocument[]) => {
    setFiles(prev => [...prev, ...newFiles]);
    setFolders(prev => [...prev, ...newFolders]);
    
    // Select the first generated file
    if (newFiles.length > 0) {
      const firstFile = newFiles[0];
      setSelectedFileId(firstFile._id);
      setSelectedFile(firstFile);
    }
    
    setIsGeneratorOpen(false);
    toast.success(`Generated ${newFiles.length} files successfully!`);
  }, []);

  // Handle prompt selection
  const handlePromptSelect = useCallback((prompt: string) => {
    // This would typically be handled by the AI editor component
    console.log('Selected prompt:', prompt);
  }, []);

  // Save all changes
  const saveAllChanges = useCallback(async () => {
    try {
      // This would trigger save on all open tabs
      toast.success('All changes saved');
      setLastSaved(new Date());
      setUnsavedChanges(0);
    } catch {
      toast.error('Failed to save changes');
    }
  }, []);

  // Export project
  const exportProject = useCallback(async () => {
    try {
      // Create a zip file with all project files
      toast.success('Project exported successfully');
    } catch {
      toast.error('Failed to export project');
    }
  }, []);

  // Get layout classes
  const getLayoutClasses = () => {
    switch (layoutMode) {
      case 'focus':
        return 'grid-cols-[0px_1fr]'; // Hide sidebar
      case 'split':
        return 'grid-cols-[300px_1fr_1fr]'; // Add preview panel
      case 'preview':
        return 'grid-cols-[300px_0px_1fr]'; // Hide editor, show preview
      default:
        return 'grid-cols-[300px_1fr]'; // Default layout
    }
  };

  const renderLeftPanel = () => {
    switch (leftPanelView) {
      case 'ai-generator':
        return (
          <ProjectGenerator
            projectId={projectId}
            onProjectGenerated={handleProjectGenerated}
            onClose={() => setLeftPanelView('files')}
          />
        );
      case 'prompts':
        return (
          <PromptSystem
            onPromptSelect={handlePromptSelect}
            currentFileType={selectedFile?.type}
          />
        );
      case 'settings':
        return (
          <div className="p-4">
            <h3 className="text-lg font-semibold text-white mb-4">Settings</h3>
            <p className="text-neutral-400">Settings panel coming soon...</p>
          </div>
        );
      default:
        return (
          <FileExplorer
            projectId={projectId}
            onFileSelect={handleFileSelect}
            onFileCreate={handleFileCreate}
            onFileUpdate={handleFileUpdate}
            onFileDelete={handleFileDelete}
            onFolderCreate={handleFolderCreate}
            selectedFileId={selectedFileId ?? undefined}
          />
        );
    }
  };

  return (
    <div className={`h-screen bg-neutral-950 flex flex-col ${getLayoutClasses()} ${className}`}>
      {/* Top Toolbar */}
      <div className="h-12 bg-neutral-900 border-b border-neutral-800 flex items-center justify-between px-4">
        <div className="flex items-center gap-4">
          {/* Panel View Selector */}
          <div className="flex items-center gap-1">
            <Button
              variant={leftPanelView === 'files' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLeftPanelView('files')}
            >
              <Folder className="h-4 w-4" />
            </Button>
            <Button
              variant={leftPanelView === 'ai-generator' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLeftPanelView('ai-generator')}
            >
              <Wand2 className="h-4 w-4" />
            </Button>
            <Button
              variant={leftPanelView === 'prompts' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLeftPanelView('prompts')}
            >
              <MessageSquare className="h-4 w-4" />
            </Button>
          </div>

          {/* Layout Mode Selector */}
          <div className="flex items-center gap-1">
            <Button
              variant={layoutMode === 'default' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLayoutMode('default')}
              title="Default Layout"
            >
              <Layout className="h-4 w-4" />
            </Button>
            <Button
              variant={layoutMode === 'focus' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLayoutMode('focus')}
              title="Focus Mode"
            >
              <Maximize2 className="h-4 w-4" />
            </Button>
            <Button
              variant={layoutMode === 'split' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLayoutMode('split')}
              title="Split View"
            >
              <Split className="h-4 w-4" />
            </Button>
            <Button
              variant={layoutMode === 'preview' ? 'default' : 'ghost'}
              size="sm"
              onClick={() => setLayoutMode('preview')}
              title="Preview Mode"
            >
              <Eye className="h-4 w-4" />
            </Button>
          </div>
        </div>

        <div className="flex items-center gap-4">
          {/* Project Status */}
          <div className="flex items-center gap-2 text-sm text-neutral-400">
            <Badge variant="outline" className="text-xs">
              {files.length} files
            </Badge>
            {unsavedChanges > 0 && (
              <Badge variant="destructive" className="text-xs">
                {unsavedChanges} unsaved
              </Badge>
            )}
            {lastSaved && (
              <span className="text-xs">
                Saved {lastSaved.toLocaleTimeString()}
              </span>
            )}
          </div>

          {/* Actions */}
          <div className="flex items-center gap-1">
            <Button
              variant="ghost"
              size="sm"
              onClick={saveAllChanges}
              disabled={unsavedChanges === 0}
            >
              <Save className="h-4 w-4" />
            </Button>
            
            <Button
              variant="ghost"
              size="sm"
              onClick={loadProjectData}
              disabled={isLoading}
            >
              <RefreshCw className={`h-4 w-4 ${isLoading ? 'animate-spin' : ''}`} />
            </Button>

            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <Button variant="ghost" size="sm">
                  ⋮
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="end">
                <DropdownMenuItem onClick={() => setIsGeneratorOpen(true)}>
                  <Wand2 className="h-4 w-4 mr-2" />
                  AI Project Generator
                </DropdownMenuItem>
                <DropdownMenuSeparator />
                <DropdownMenuItem onClick={exportProject}>
                  <Download className="h-4 w-4 mr-2" />
                  Export Project
                </DropdownMenuItem>
                <DropdownMenuItem>
                  <Upload className="h-4 w-4 mr-2" />
                  Import Files
                </DropdownMenuItem>
                <DropdownMenuSeparator />
                <DropdownMenuItem onClick={() => setLeftPanelView('settings')}>
                  <Settings className="h-4 w-4 mr-2" />
                  Settings
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          </div>
        </div>
      </div>

      {/* Main Content */}
      <div className="flex-1 overflow-hidden">
        <ResizablePanelGroup direction="horizontal">
          {/* Left Panel */}
          {layoutMode !== 'focus' && (
            <>
              <ResizablePanel defaultSize={25} minSize={20} maxSize={40}>
                {renderLeftPanel()}
              </ResizablePanel>
              <ResizableHandle />
            </>
          )}

          {/* Editor Panel */}
          {layoutMode !== 'preview' && (
            <>
              <ResizablePanel defaultSize={layoutMode === 'split' ? 50 : 75}>
                <div className="relative h-full">
                  <MultiTabEditor
                    projectId={projectId}
                    files={files}
                    selectedFileId={selectedFileId ?? undefined}
                    onFileUpdate={handleFileUpdate}
                    onFileCreate={() => setLeftPanelView('files')}
                  />
                  
                  {/* Smart Editor Overlay */}
                  {selectedFile && (
                    <SmartEditor
                      file={selectedFile}
                      projectId={projectId}
                      onContentUpdate={(content) => {
                        const updatedFile = { ...selectedFile, content };
                        setSelectedFile(updatedFile);
                        setUnsavedChanges(prev => prev + 1);
                      }}
                      onSave={() => {
                        // Handle save
                        setUnsavedChanges(prev => Math.max(0, prev - 1));
                      }}
                    />
                  )}
                </div>
              </ResizablePanel>
              {layoutMode === 'split' && <ResizableHandle />}
            </>
          )}

          {/* Preview Panel */}
          {(layoutMode === 'split' || layoutMode === 'preview') && (
            <ResizablePanel defaultSize={layoutMode === 'preview' ? 75 : 50}>
              <div className="h-full bg-neutral-900 border-l border-neutral-800">
                {selectedFile ? (
                  <div className="h-full">
                    {/* Preview content would go here */}
                    <div className="p-4 text-center text-neutral-400">
                      <Eye className="h-12 w-12 mx-auto mb-4 opacity-50" />
                      <p>Preview for {selectedFile.name}</p>
                      <p className="text-sm">Preview functionality coming soon</p>
                    </div>
                  </div>
                ) : (
                  <div className="h-full flex items-center justify-center text-neutral-400">
                    <div className="text-center">
                      <FileText className="h-12 w-12 mx-auto mb-4 opacity-50" />
                      <p>Select a file to preview</p>
                    </div>
                  </div>
                )}
              </div>
            </ResizablePanel>
          )}
        </ResizablePanelGroup>
      </div>

      {/* AI Project Generator Dialog */}
      <Dialog open={isGeneratorOpen} onOpenChange={setIsGeneratorOpen}>
        <DialogContent className="max-w-6xl max-h-[90vh] p-0">
          <ProjectGenerator
            projectId={projectId}
            onProjectGenerated={handleProjectGenerated}
            onClose={() => setIsGeneratorOpen(false)}
          />
        </DialogContent>
      </Dialog>
    </div>
  );
}