<?php
require_once __DIR__ . '/config.php';

echo "Starting Database Migration..." . PHP_EOL;

$pdo = db();

$migrations = [
    // Add indexes if they don't exist
    "ALTER TABLE users ADD INDEX IF NOT EXISTS idx_users_username (username)",
    "ALTER TABLE users ADD INDEX IF NOT EXISTS idx_users_role (role)",
    "ALTER TABLE customers ADD INDEX IF NOT EXISTS idx_customers_email (email)",
    "ALTER TABLE customers ADD INDEX IF NOT EXISTS idx_customers_status (status)",
    "ALTER TABLE customers ADD INDEX IF NOT EXISTS idx_customers_deleted_at (deleted_at)",
    "ALTER TABLE products ADD INDEX IF NOT EXISTS idx_products_name (name)",
    "ALTER TABLE products ADD INDEX IF NOT EXISTS idx_products_deleted_at (deleted_at)",
    "ALTER TABLE quotations ADD INDEX IF NOT EXISTS idx_quotations_status (status)",
    "ALTER TABLE quotations ADD INDEX IF NOT EXISTS idx_quotations_expiry_date (expiry_date)",
    "ALTER TABLE invoices ADD INDEX IF NOT EXISTS idx_invoices_status (status)",
    "ALTER TABLE invoices ADD INDEX IF NOT EXISTS idx_invoices_due_date (due_date)",
    
    // Add reminder columns if they don't exist
    "ALTER TABLE quotations ADD COLUMN IF NOT EXISTS last_reminded_at TIMESTAMP NULL DEFAULT NULL AFTER notes",
    "ALTER TABLE invoices ADD COLUMN IF NOT EXISTS last_reminded_at TIMESTAMP NULL DEFAULT NULL AFTER notes",
    
    // Convert IDs to BIGINT UNSIGNED for Laravel compatibility (Note: this might fail if FKs exist, but let's try)
    // "ALTER TABLE users MODIFY id BIGINT UNSIGNED AUTO_INCREMENT",
    // This part is tricky because of foreign keys. For a "ready-to-migrate" structure, 
    // it's better to ensure new tables have it. 
    // For existing ones, we'll keep INT for now to avoid breaking FKs in this safe mode.
];

foreach ($migrations as $sql) {
    try {
        echo "Executing: $sql" . PHP_EOL;
        $pdo->exec($sql);
    } catch (PDOException $e) {
        echo "Warning: " . $e->getMessage() . PHP_EOL;
    }
}

echo "Migration finished." . PHP_EOL;