import { useState, useEffect, useCallback } from 'react';
import { toast } from 'sonner';
import { foldersApi } from '@/lib/api';

// Define folder interface (database-compatible)
export interface Folder {
  _id: string;
  id?: string; // Legacy compatibility
  name: string;
  created_at?: string;
  created_by?: string;
  updated_at?: string;
}

// Default folder ID for "All Personas"
export const DEFAULT_FOLDER_ID = 'all';

interface UseFolderManagementReturn {
  folders: Folder[];
  selectedFolder: string;
  setSelectedFolder: (id: string) => void;
  isCreatingFolder: boolean;
  setIsCreatingFolder: (creating: boolean) => void;
  newFolderName: string;
  setNewFolderName: (name: string) => void;
  folderToRename: Folder | null;
  renameFolderName: string;
  setRenameFolderName: (name: string) => void;
  fetchFolders: () => Promise<Folder[]>;
  createNewFolder: () => Promise<void>;
  cancelFolderCreation: () => void;
  startRenameFolder: (folder: Folder) => void;
  completeRenameFolder: () => Promise<void>;
  cancelRenameFolder: () => void;
}

export function useFolderManagement(): UseFolderManagementReturn {
  const [folders, setFolders] = useState<Folder[]>([]);
  const [selectedFolder, setSelectedFolder] = useState<string>(DEFAULT_FOLDER_ID);
  const [isCreatingFolder, setIsCreatingFolder] = useState(false);
  const [newFolderName, setNewFolderName] = useState('');
  const [folderToRename, setFolderToRename] = useState<Folder | null>(null);
  const [renameFolderName, setRenameFolderName] = useState('');

  // Function to fetch folders from database
  const fetchFolders = useCallback(async (): Promise<Folder[]> => {
    try {
      const response = await foldersApi.getAll();
      const serverFolders = response.data;

      // Convert server folder format to match frontend expectations
      const processedFolders: Folder[] = serverFolders.map((folder: any) => ({
        ...folder,
        id: folder._id // Add legacy id field for compatibility
      }));

      setFolders(processedFolders);
      return processedFolders;
    } catch (error) {
      console.error("Error fetching folders:", error);
      toast.error("Failed to load folders");
      setFolders([]);
      return [];
    }
  }, []);

  // Create new folder
  const createNewFolder = useCallback(async () => {
    if (!newFolderName.trim()) {
      toast.error("Please enter a folder name");
      return;
    }

    try {
      await foldersApi.create({
        name: newFolderName.trim()
      });

      // Refresh folders from server
      await fetchFolders();

      setNewFolderName('');
      setIsCreatingFolder(false);

      toast.success(`Folder "${newFolderName}" created`);
    } catch (error) {
      console.error("Error creating folder:", error);
      toast.error("Failed to create folder");
    }
  }, [newFolderName, fetchFolders]);

  // Cancel folder creation
  const cancelFolderCreation = useCallback(() => {
    setNewFolderName('');
    setIsCreatingFolder(false);
  }, []);

  // Start renaming a folder
  const startRenameFolder = useCallback((folder: Folder) => {
    setFolderToRename(folder);
    setRenameFolderName(folder.name);
  }, []);

  // Complete folder rename
  const completeRenameFolder = useCallback(async () => {
    if (!folderToRename || !renameFolderName.trim()) {
      setFolderToRename(null);
      return;
    }

    try {
      await foldersApi.update(folderToRename._id, {
        name: renameFolderName.trim()
      });

      // Refresh folders from server
      await fetchFolders();

      setFolderToRename(null);
      toast.success(`Folder renamed to "${renameFolderName}"`);
    } catch (error) {
      console.error("Error renaming folder:", error);
      toast.error("Failed to rename folder");
      setFolderToRename(null);
    }
  }, [folderToRename, renameFolderName, fetchFolders]);

  // Cancel folder rename
  const cancelRenameFolder = useCallback(() => {
    setFolderToRename(null);
    setRenameFolderName('');
  }, []);

  // Fetch folders on mount
  useEffect(() => {
    fetchFolders();
  }, [fetchFolders]);

  return {
    folders,
    selectedFolder,
    setSelectedFolder,
    isCreatingFolder,
    setIsCreatingFolder,
    newFolderName,
    setNewFolderName,
    folderToRename,
    renameFolderName,
    setRenameFolderName,
    fetchFolders,
    createNewFolder,
    cancelFolderCreation,
    startRenameFolder,
    completeRenameFolder,
    cancelRenameFolder,
  };
}