<?php
// db/config.php

// --- Database Credentials ---
// These are typically stored in environment variables for security
define('DB_HOST', '127.0.0.1');
define('DB_NAME', 'app_db');
define('DB_USER', 'app_user');
define('DB_PASS', 'password'); // Replace with a strong password in a real app

// --- PDO Helper Function ---
function db(): ?PDO {
    static $pdo = null;

    if ($pdo !== null) {
        return $pdo;
    }

    $dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME . ';charset=utf8mb4';
    $options = [
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::ATTR_EMULATE_PREPARES   => false,
    ];

    try {
        $pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
        return $pdo;
    } catch (PDOException $e) {
        error_log('DB Connection Error: ' . $e->getMessage());
        return null;
    }
}

// --- Initial Table Setup ---
function setup_database() {
    $pdo = db();
    if ($pdo) {
        try {
            $pdo->exec("CREATE TABLE IF NOT EXISTS leads (
                id INT AUTO_INCREMENT PRIMARY KEY,
                lead_name VARCHAR(255) NOT NULL,
                status VARCHAR(50) NOT NULL,
                category VARCHAR(50) NOT NULL,
                contact_email VARCHAR(255) NOT NULL,
                owner VARCHAR(255) NOT NULL,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );");

            // Add some dummy data if the table is empty
            $stmt = $pdo->query("SELECT COUNT(*) FROM leads");
            if ($stmt->fetchColumn() == 0) {
                $pdo->exec("
                    INSERT INTO leads (lead_name, status, category, contact_email, owner) VALUES
                    ('Global Corp vs. Local Biz', 'New', 'Corporate', 'ceo@globalcorp.com', 'John Doe'),
                    ('Smith Divorce Case', 'Contacted', 'Family', 'jane.smith@email.com', 'Jane Smith'),
                    ('State vs. Anderson', 'Qualified', 'Criminal', 'anderson@email.com', 'John Doe'),
                    ('Tech Innovations Inc. Patent', 'New', 'Corporate', 'contact@techinnovations.com', 'Jane Smith'),
                    ('Real Estate Dispute', 'Lost', 'Corporate', 'buyer@realestate.com', 'John Doe');
                ");
            }

        } catch (PDOException $e) {
            error_log('DB Setup Error: ' . $e->getMessage());
        }
    }
}

// Run setup
setup_database();

?>