import defaultData from './cv.json';

export const DEFAULT_DATA = defaultData;

export function validateCV(data) {
  const errors = [];
  
  if (!data.personal) {
    errors.push('personal is required');
  } else {
    if (!data.personal.name?.trim()) errors.push('personal.name is required');
    if (!data.personal.title?.trim()) errors.push('personal.title is required');
    if (!data.personal.email?.trim()) errors.push('personal.email is required');
  }
  
  if (!Array.isArray(data.experience)) {
    errors.push('experience must be an array');
  }
  
  if (!data.skills || typeof data.skills !== 'object') {
    errors.push('skills must be an object');
  }
  
  if (!Array.isArray(data.education)) {
    errors.push('education must be an array');
  }
  
  if (!Array.isArray(data.projects)) {
    errors.push('projects must be an array');
  }
  
  return {
    valid: errors.length === 0,
    errors
  };
}

export function mergeCVData(base, updates) {
  return {
    ...base,
    ...updates,
    personal: { ...base.personal, ...updates.personal }
  };
}

export function exportToJSON(data) {
  return JSON.stringify(data, null, 2);
}

export function importFromJSON(jsonString) {
  try {
    const parsed = JSON.parse(jsonString);
    const validation = validateCV(parsed);
    if (!validation.valid) {
      return { success: false, errors: validation.errors };
    }
    return { success: true, data: parsed };
  } catch (e) {
    return { success: false, errors: [`JSON parse error: ${e.message}`] };
  }
}

export function downloadJSON(data, filename = 'cv.json') {
  const json = exportToJSON(data);
  const blob = new Blob([json], { type: 'application/json' });
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  a.download = filename;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
}