/**
 * Script: Export Teacher Profiles to JSON
 * Xuất chi tiết thông tin tất cả teachers ra file JSON
 * 
 * Usage:
 *   node src/scripts/export-teachers-info.js
 *   node src/scripts/export-teachers-info.js --output=teachers.json
 */

require('dotenv').config();
const fs = require('fs');
const path = require('path');
const { sequelize, TeacherDetail, UserProfile, UsersAuth } = require('../models');

async function exportTeachersInfo() {
  console.log('📤 Exporting All Teachers Information...\n');
  
  try {
    await sequelize.authenticate();
    console.log('✅ Database connected\n');
    
    // Get all teachers
    const teachers = await TeacherDetail.findAll({
      order: [['created_at', 'ASC']],
    });
    
    console.log(`📊 Found ${teachers.length} teachers\n`);
    console.log('Processing...\n');
    
    const exportData = [];
    
    for (const teacher of teachers) {
      // Get auth info
      const userAuth = await UsersAuth.findByPk(teacher.user_id, {
        attributes: ['id', 'username', 'email', 'is_active', 'last_login', 'login_count', 'qr_version'],
      });
      
      // Get profile info
      const userProfile = await UserProfile.findOne({
        where: { user_id: teacher.user_id },
      });
      
      const teacherData = {
        // Teacher Details
        teacher_id: teacher.id,
        teacher_code: teacher.teacher_code,
        teacher_type: teacher.teacher_type,
        status: teacher.status,
        qualification: teacher.qualification,
        specialization: teacher.specialization,
        hire_date: teacher.hire_date,
        training_hours: teacher.training_hours,
        last_training_date: teacher.last_training_date,
        training_score_avg: teacher.training_score_avg,
        skill_tags: teacher.skill_tags,
        certifications: teacher.certifications,
        created_at: teacher.created_at,
        updated_at: teacher.updated_at,
        
        // Auth Info
        user_id: teacher.user_id,
        username: userAuth?.username,
        email: userAuth?.email,
        is_active: userAuth?.is_active,
        last_login: userAuth?.last_login,
        login_count: userAuth?.login_count,
        qr_version: userAuth?.qr_version,
        
        // Profile Info
        has_profile: !!userProfile,
        profile: userProfile ? {
          profile_id: userProfile.id,
          full_name: userProfile.full_name,
          first_name: userProfile.first_name,
          last_name: userProfile.last_name,
          phone: userProfile.phone,
          date_of_birth: userProfile.date_of_birth,
          gender: userProfile.gender,
          address: userProfile.address,
          school_id: userProfile.school_id,
          city: userProfile.city,
          district: userProfile.district,
          avatar_url: userProfile.avatar_url,
          etc: userProfile.etc,
          created_at: userProfile.created_at,
          updated_at: userProfile.updated_at,
        } : null,
      };
      
      exportData.push(teacherData);
    }
    
    // Summary statistics
    const stats = {
      total_teachers: exportData.length,
      with_profile: exportData.filter(t => t.has_profile).length,
      without_profile: exportData.filter(t => !t.has_profile).length,
      active: exportData.filter(t => t.is_active).length,
      inactive: exportData.filter(t => !t.is_active).length,
      by_type: {
        foreign: exportData.filter(t => t.teacher_type === 'foreign').length,
        homeroom: exportData.filter(t => t.teacher_type === 'homeroom').length,
        subject: exportData.filter(t => t.teacher_type === 'subject').length,
        assistant: exportData.filter(t => t.teacher_type === 'assistant').length,
      },
      by_status: {
        active: exportData.filter(t => t.status === 'active').length,
        on_leave: exportData.filter(t => t.status === 'on_leave').length,
        resigned: exportData.filter(t => t.status === 'resigned').length,
      },
    };
    
    // Parse output filename
    const args = process.argv.slice(2);
    const outputArg = args.find(arg => arg.startsWith('--output='));
    const outputFileName = outputArg ? outputArg.split('=')[1] : 'teachers-export.json';
    const outputPath = path.join(process.cwd(), '..', 'data', outputFileName);
    
    // Prepare export object
    const exportObject = {
      exported_at: new Date().toISOString(),
      statistics: stats,
      teachers: exportData,
    };
    
    // Write to file
    fs.writeFileSync(outputPath, JSON.stringify(exportObject, null, 2), 'utf8');
    
    console.log('✅ Export completed!\n');
    console.log('📊 Statistics:');
    console.log('='.repeat(60));
    console.log(`Total Teachers: ${stats.total_teachers}`);
    console.log(`  ✅ With Profile: ${stats.with_profile}`);
    console.log(`  ❌ Without Profile: ${stats.without_profile}`);
    console.log(`  🟢 Active: ${stats.active}`);
    console.log(`  🔴 Inactive: ${stats.inactive}`);
    console.log('\nBy Teacher Type:');
    console.log(`  Foreign: ${stats.by_type.foreign}`);
    console.log(`  Homeroom: ${stats.by_type.homeroom}`);
    console.log(`  Subject: ${stats.by_type.subject}`);
    console.log(`  Assistant: ${stats.by_type.assistant}`);
    console.log('\nBy Status:');
    console.log(`  Active: ${stats.by_status.active}`);
    console.log(`  On Leave: ${stats.by_status.on_leave}`);
    console.log(`  Resigned: ${stats.by_status.resigned}`);
    console.log('='.repeat(60));
    console.log(`\n📁 File saved: ${outputPath}`);
    console.log(`   Size: ${(fs.statSync(outputPath).size / 1024).toFixed(2)} KB\n`);
    
    // Show sample data
    console.log('📋 Sample Teacher Data (first 3):\n');
    exportData.slice(0, 3).forEach((t, i) => {
      console.log(`${i + 1}. ${t.teacher_code} (${t.teacher_type})`);
      console.log(`   Username: ${t.username}`);
      console.log(`   Email: ${t.email}`);
      console.log(`   Full Name: ${t.profile?.full_name || 'N/A'}`);
      console.log(`   Phone: ${t.profile?.phone || 'N/A'}`);
      console.log(`   Status: ${t.status} | Active: ${t.is_active}`);
      console.log('');
    });
    
    return {
      outputPath,
      stats,
    };
    
  } catch (error) {
    console.error('❌ Export failed:', error.message);
    throw error;
  }
}

async function main() {
  console.log('\n🚀 Teacher Profile Export Tool\n');
  
  try {
    const result = await exportTeachersInfo();
    
    console.log('🎉 Done! You can now view the exported file:\n');
    console.log(`   cat ${result.outputPath}`);
    console.log(`   or open it in a text editor/VS Code\n`);
    
    process.exit(0);
    
  } catch (error) {
    console.error('\n❌ Error:', error.message);
    console.error(error.stack);
    process.exit(1);
  }
}

// Run
main();