src/hooks/use-recent-files.ts

'use client';

import { useState, useEffect, useCallback } from 'react';

const RECENT_FILES_KEY = 'clinical-note-recent-files';
const MAX_RECENT_FILES = 5;

export interface RecentFile {
  id: string;
  name: string;
  content: string;
  timestamp: number;
  preview: string; // First 100 chars
}

export function useRecentFiles() {
  const [recentFiles, setRecentFiles] = useState<RecentFile[]>([]);

  // Load recent files on mount
  useEffect(() => {
    try {
      const saved = localStorage.getItem(RECENT_FILES_KEY);
      if (saved) {
        const files = JSON.parse(saved) as RecentFile[];
        setRecentFiles(files);
      }
    } catch (error) {
      console.error('Failed to load recent files:', error);
    }
  }, []);

  // Save file to recent files
  const addRecentFile = useCallback((name: string, content: string) => {
    try {
      const newFile: RecentFile = {
        id: `${Date.now()}-${Math.random().toString(36).slice(2, 11)}`,
        name,
        content,
        timestamp: Date.now(),
        preview: content.slice(0, 100).replace(/\n/g, ' '),
      };

      setRecentFiles((prev) => {
        // Remove duplicate if exists (same name)
        const filtered = prev.filter((f) => f.name !== name);
        // Add new file to the beginning
        const updated = [newFile, ...filtered].slice(0, MAX_RECENT_FILES);

        // Save to localStorage
        localStorage.setItem(RECENT_FILES_KEY, JSON.stringify(updated));

        return updated;
      });
    } catch (error) {
      console.error('Failed to save recent file:', error);
    }
  }, []);

  // Clear all recent files
  const clearRecentFiles = useCallback(() => {
    try {
      localStorage.removeItem(RECENT_FILES_KEY);
      setRecentFiles([]);
    } catch (error) {
      console.error('Failed to clear recent files:', error);
    }
  }, []);

  // Remove specific file
  const removeRecentFile = useCallback((id: string) => {
    try {
      setRecentFiles((prev) => {
        const updated = prev.filter((f) => f.id !== id);
        localStorage.setItem(RECENT_FILES_KEY, JSON.stringify(updated));
        return updated;
      });
    } catch (error) {
      console.error('Failed to remove recent file:', error);
    }
  }, []);

  return {
    recentFiles,
    addRecentFile,
    clearRecentFiles,
    removeRecentFile,
  };
}