117 lines
3.5 KiB
PHP
117 lines
3.5 KiB
PHP
<?php
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class Database {
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private static $instance = null;
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private $connection;
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private function __construct() {
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$this->initializeConnection();
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$this->checkAndCreateDatabase();
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$this->checkAndCreateTables();
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}
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/**
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* Get the singleton instance of the Database
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* @return Database
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*/
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public static function getInstance() {
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if (self::$instance === null) {
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self::$instance = new Database();
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}
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return self::$instance;
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}
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/**
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* Get the active database connection
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* @return mysqli
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*/
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public function getConnection() {
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return $this->connection;
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}
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/**
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* Initialize the connection to the database
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*/
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private function initializeConnection() {
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$this->connection = new mysqli(DB_HOST, DB_USER, DB_PASS);
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if ($this->connection->connect_error) {
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die("Database connection failed: " . $this->connection->connect_error);
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}
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}
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/**
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* Check and create the database if it doesn't exist
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*/
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private function checkAndCreateDatabase() {
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$query = "CREATE DATABASE IF NOT EXISTS `" . DB_NAME . "`";
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if (!$this->connection->query($query)) {
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die("Failed to create or access database: " . $this->connection->error);
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}
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$this->connection->select_db(DB_NAME);
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}
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/**
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* Check and create required tables if they don't exist
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*/
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private function checkAndCreateTables() {
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// Create users table
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$usersTableQuery = "CREATE TABLE IF NOT EXISTS users (
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id INT AUTO_INCREMENT PRIMARY KEY,
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username VARCHAR(50) NOT NULL,
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email VARCHAR(100) NOT NULL UNIQUE,
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password VARCHAR(255) NOT NULL,
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points INT DEFAULT 0,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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) ENGINE=InnoDB;";
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if (!$this->connection->query($usersTableQuery)) {
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die("Failed to create users table: " . $this->connection->error);
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}
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// Create progress table
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$progressTableQuery = "CREATE TABLE IF NOT EXISTS progress (
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id INT AUTO_INCREMENT PRIMARY KEY,
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user_id INT NOT NULL,
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habit_id INT NOT NULL,
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date DATE NOT NULL,
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status ENUM('Done', 'Pending') DEFAULT 'Pending',
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FOREIGN KEY (user_id) REFERENCES users(id)
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) ENGINE=InnoDB;";
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if (!$this->connection->query($progressTableQuery)) {
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die("Failed to create progress table: " . $this->connection->error);
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}
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// Create habits table
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$habitsTableQuery = "CREATE TABLE IF NOT EXISTS habits (
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id INT AUTO_INCREMENT PRIMARY KEY,
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user_id INT NOT NULL,
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title VARCHAR(100) NOT NULL,
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frequency ENUM('Daily', 'Weekly', 'Custom') NOT NULL,
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custom_frequency VARCHAR(255) DEFAULT NULL, -- Store crontab-like string
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reward_points INT DEFAULT 1,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
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) ENGINE=InnoDB;";
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if (!$this->connection->query($habitsTableQuery)) {
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die("Failed to create habits table: " . $this->connection->error);
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}
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}
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/**
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* Prevent cloning of the singleton instance
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*/
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private function __clone() {}
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/**
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* Prevent unserialization of the singleton instance
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*/
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public function __wakeup() {}
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}
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