import db from './src/lib/db.js';
import initializeDatabase from './src/lib/init-db.js';

console.log('🚀 Migrating contact data from projects...\n');

try {
	// Run database initialization to ensure tables exist
	initializeDatabase();
	
	console.log('✅ Database tables verified\n');
	
	// Get all projects with contact data
	const projectsWithContacts = db.prepare(`
		SELECT project_id, project_name, contact 
		FROM projects 
		WHERE contact IS NOT NULL AND contact != '' AND TRIM(contact) != ''
	`).all();
	
	if (projectsWithContacts.length === 0) {
		console.log('ℹ️  No contact data found in projects to migrate.\n');
		process.exit(0);
	}
	
	console.log(`📋 Found ${projectsWithContacts.length} projects with contact information\n`);
	
	let created = 0;
	let linked = 0;
	let skipped = 0;
	
	const createContact = db.prepare(`
		INSERT INTO contacts (name, phone, email, contact_type, notes, is_active)
		VALUES (?, ?, ?, 'project', ?, 1)
	`);
	
	const linkContact = db.prepare(`
		INSERT OR IGNORE INTO project_contacts (project_id, contact_id, is_primary, relationship_type)
		VALUES (?, ?, 1, 'general')
	`);
	
	// Process each project
	for (const project of projectsWithContacts) {
		try {
			const contactText = project.contact.trim();
			
			// Parse contact information - common formats:
			// "Jan Kowalski, tel. 123-456-789"
			// "Jan Kowalski 123-456-789"
			// "123-456-789"
			// "Jan Kowalski"
			
			let name = '';
			let phone = '';
			let email = '';
			let notes = '';
			
			// Try to extract email
			const emailPattern = /([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9_-]+)/;
			const emailMatch = contactText.match(emailPattern);
			if (emailMatch) {
				email = emailMatch[1].trim();
			}
			
			// Try to extract phone number (various formats)
			const phonePatterns = [
				/(?:\+?48)?[\s-]?(\d{3}[\s-]?\d{3}[\s-]?\d{3})/,  // Polish: 123-456-789, 123 456 789, +48 123456789
				/(?:\+?48)?[\s-]?(\d{9})/,                          // 9 digits
				/tel\.?\s*[:.]?\s*([+\d\s-]+)/i,                    // tel. 123-456-789
				/phone\s*[:.]?\s*([+\d\s-]+)/i,                     // phone: 123-456-789
				/(\d{3}[-\s]?\d{3}[-\s]?\d{3})/,                    // Generic phone pattern
			];
			
			for (const pattern of phonePatterns) {
				const match = contactText.match(pattern);
				if (match) {
					phone = match[1] || match[0];
					phone = phone.replace(/\s+/g, ' ').trim();
					break;
				}
			}
			
			// Extract name (text before phone/email or comma)
			let textForName = contactText;
			
			if (phone) {
				// Remove phone from text to get name
				textForName = textForName.replace(phone, '');
			}
			if (email) {
				// Remove email from text to get name
				textForName = textForName.replace(email, '');
			}
			
			// Remove common prefixes like "tel.", "phone:", "email:", commas, etc.
			name = textForName.replace(/tel\.?|phone:?|email:?|e-mail:?|,/gi, '').trim();
			
			// Clean up name
			name = name.replace(/^[,\s-]+|[,\s-]+$/g, '').trim();
			
			// If we couldn't extract structured data, use project name and put original text in notes
			if (!phone && !email) {
				// No structured contact info found, put everything in notes
				notes = `Original contact info: ${contactText}`;
				name = project.project_name;
			} else if (!name) {
				// We have phone/email but no clear name
				name = project.project_name;
			}
			
			// Check if this contact already exists (by name, phone, or email)
			let existingContact = null;
			if (phone) {
				existingContact = db.prepare(`
					SELECT contact_id FROM contacts 
					WHERE phone LIKE ? OR phone LIKE ?
				`).get(`%${phone}%`, `%${phone.replace(/\s/g, '')}%`);
			}
			
			if (!existingContact && email) {
				existingContact = db.prepare(`
					SELECT contact_id FROM contacts 
					WHERE LOWER(email) = LOWER(?)
				`).get(email);
			}
			
			if (!existingContact && name && name !== project.project_name) {
				existingContact = db.prepare(`
					SELECT contact_id FROM contacts 
					WHERE LOWER(name) = LOWER(?)
				`).get(name);
			}
			
			let contactId;
			
			if (existingContact) {
				contactId = existingContact.contact_id;
				console.log(`  ♻️  Using existing contact "${name}" for project "${project.project_name}"`);
			} else {
				// Create new contact
				const result = createContact.run(
					name,
					phone || null,
					email || null,
					notes || `Migrated from project: ${project.project_name}`
				);
				contactId = result.lastInsertRowid;
				created++;
				
				const contactInfo = [];
				if (phone) contactInfo.push(`📞 ${phone}`);
				if (email) contactInfo.push(`📧 ${email}`);
				const infoStr = contactInfo.length > 0 ? ` (${contactInfo.join(', ')})` : '';
				
				console.log(`  ✨ Created contact "${name}"${infoStr} for project "${project.project_name}"`);
			}
			
			// Link contact to project
			linkContact.run(project.project_id, contactId);
			linked++;
			
		} catch (error) {
			console.error(`  ❌ Error processing project "${project.project_name}":`, error.message);
			skipped++;
		}
	}
	
	console.log('\n📊 Migration Summary:');
	console.log(`   - Contacts created: ${created}`);
	console.log(`   - Project-contact links created: ${linked}`);
	console.log(`   - Projects skipped: ${skipped}`);
	console.log(`   - Total projects processed: ${projectsWithContacts.length}`);
	
	// Show final statistics
	const contactsCount = db.prepare('SELECT COUNT(*) as count FROM contacts').get();
	const projectContactsCount = db.prepare('SELECT COUNT(*) as count FROM project_contacts').get();
	
	console.log('\n📈 Current Database Statistics:');
	console.log(`   - Total contacts: ${contactsCount.count}`);
	console.log(`   - Total project-contact links: ${projectContactsCount.count}`);
	
	console.log('\n✨ Migration complete!');
	console.log('   - Visit /contacts to view and manage your contacts');
	console.log('   - Edit projects to see linked contacts');
	console.log('   - The old contact text field is preserved for reference\n');
	
} catch (error) {
	console.error('❌ Error during migration:', error);
	process.exit(1);
}