import { useState, useCallback } from 'react';
import { cvData as initialData } from '../../data/cv';

export function useCVData() {
  const [data, setData] = useState(initialData);
  
  const updatePersonal = useCallback((personal) => {
    setData(prev => ({ ...prev, personal }));
  }, []);
  
  const updateExperience = useCallback((experience) => {
    setData(prev => ({ ...prev, experience }));
  }, []);
  
  const updateSkills = useCallback((skills) => {
    setData(prev => ({ ...prev, skills }));
  }, []);
  
  const updateEducation = useCallback((education) => {
    setData(prev => ({ ...prev, education }));
  }, []);
  
  const updateProjects = useCallback((projects) => {
    setData(prev => ({ ...prev, projects }));
  }, []);
  
  const exportJSON = useCallback(() => {
    const json = JSON.stringify(data, null, 2);
    const blob = new Blob([json], { type: 'application/json' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'cv.json';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
  }, [data]);
  
  const importJSON = useCallback((jsonString) => {
    try {
      const parsed = JSON.parse(jsonString);
      setData(parsed);
      return { success: true };
    } catch (e) {
      return { success: false, error: e.message };
    }
  }, []);
  
  return {
    data,
    updatePersonal,
    updateExperience,
    updateSkills,
    updateEducation,
    updateProjects,
    exportJSON,
    importJSON
  };
}