Added: Signin Up, connection to the DB, validator, base controller, base view, environment file, User model

core/Controller.php

@@ -0,0 +1,23 @@
+<?php
+class Controller {
+    /**
+     * Redirect to a given URL
+     *
+     * @param string $url
+     */
+    public function redirect($url) {
+        header("Location: $url");
+        exit();
+    }
+
+    /**
+     * Render a view
+     *
+     * @param string $viewName
+     * @param array $data
+     */
+    public function view($viewName, $data = []) {
+        $view = new View();
+        $view->render($viewName, $data);
+    }
+}

core/Database.php

@@ -0,0 +1,101 @@
+<?php
+
+class Database {
+    private static $instance = null;
+    private $connection;
+
+    private function __construct() {
+        $this->initializeConnection();
+        $this->checkAndCreateDatabase();
+        $this->checkAndCreateTables();
+    }
+
+    /**
+     * Get the singleton instance of the Database
+     * @return Database
+     */
+    public static function getInstance() {
+        if (self::$instance === null) {
+            self::$instance = new Database();
+        }
+
+        return self::$instance;
+    }
+
+    /**
+     * Get the active database connection
+     * @return mysqli
+     */
+    public function getConnection() {
+        return $this->connection;
+    }
+
+    /**
+     * Initialize the connection to the database
+     */
+    private function initializeConnection() {
+        $this->connection = new mysqli(DB_HOST, DB_USER, DB_PASS);
+
+        if ($this->connection->connect_error) {
+            die("Database connection failed: " . $this->connection->connect_error);
+        }
+    }
+
+    /**
+     * Check and create the database if it doesn't exist
+     */
+    private function checkAndCreateDatabase() {
+        $query = "CREATE DATABASE IF NOT EXISTS `" . DB_NAME . "`";
+        if (!$this->connection->query($query)) {
+            die("Failed to create or access database: " . $this->connection->error);
+        }
+
+        $this->connection->select_db(DB_NAME);
+    }
+
+    /**
+     * Check and create required tables if they don't exist
+     */
+    private function checkAndCreateTables() {
+        // Create users table
+        $usersTableQuery = "CREATE TABLE IF NOT EXISTS users (
+            id INT AUTO_INCREMENT PRIMARY KEY,
+            username VARCHAR(50) NOT NULL,
+            email VARCHAR(100) NOT NULL UNIQUE,
+            password VARCHAR(255) NOT NULL,
+            points INT DEFAULT 0,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        ) ENGINE=InnoDB;";
+
+        if (!$this->connection->query($usersTableQuery)) {
+            die("Failed to create users table: " . $this->connection->error);
+        }
+
+        // Create progress table
+        $progressTableQuery = "CREATE TABLE IF NOT EXISTS progress (
+            id INT AUTO_INCREMENT PRIMARY KEY,
+            user_id INT NOT NULL,
+            habit_id INT NOT NULL,
+            date DATE NOT NULL,
+            status ENUM('Done', 'Pending') DEFAULT 'Pending',
+            FOREIGN KEY (user_id) REFERENCES users(id)
+        ) ENGINE=InnoDB;";
+
+        if (!$this->connection->query($progressTableQuery)) {
+            die("Failed to create progress table: " . $this->connection->error);
+        }
+
+        // Add more table creation logic as needed
+    }
+
+    /**
+     * Prevent cloning of the singleton instance
+     */
+    private function __clone() {}
+
+    /**
+     * Prevent unserialization of the singleton instance
+     */
+    public function __wakeup() {}
+
+}

core/Validator.php

@@ -0,0 +1,55 @@
+<?php
+
+class Validator {
+    private $errors = [];
+
+    /**
+     * Check if a field is not empty
+     */
+    public function required($field, $value, $message = null) {
+        if (empty(trim($value))) {
+            $this->errors[$field] = $message ?? "$field is required.";
+        }
+    }
+
+    /**
+     * Check if a field meets minimum length
+     */
+    public function minLength($field, $value, $length, $message = null) {
+        if (strlen($value) < $length) {
+            $this->errors[$field] = $message ?? "$field must be at least $length characters.";
+        }
+    }
+
+    /**
+     * Check if a field contains letters and numbers
+     */
+    public function alphanumeric($field, $value, $message = null) {
+        if (!preg_match('/^(?=.*[a-zA-Z])(?=.*\d).+$/', $value)) {
+            $this->errors[$field] = $message ?? "$field must contain letters and numbers.";
+        }
+    }
+
+    /**
+     * Validate an email
+     */
+    public function email($field, $value, $message = null) {
+        if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
+            $this->errors[$field] = $message ?? "Invalid email format.";
+        }
+    }
+
+    /**
+     * Get validation errors
+     */
+    public function errors() {
+        return $this->errors;
+    }
+
+    /**
+     * Check if validation passed
+     */
+    public function passes() {
+        return empty($this->errors);
+    }
+}

core/View.php

@@ -1,10 +1,11 @@
 <?php
 class View
 {
-    public function render($view, $data = [], $layout = 'base')
-    {
-        // Extract variables to be accessible in the view
-        extract($data);
+    private $data = [];
+
+    public function render($view, $data = [], $layout = 'base') {
+        // Store the data 
+        $this->data = $data;
 
         // Capture the view content
         ob_start();
@@ -12,6 +13,13 @@ class View
         $content = ob_get_clean();
 
         // Include the base layout and inject the view content
-        require_once  views . "layouts/$layout.php";
+        require_once views . "layouts/$layout.php";
+    }
+
+    /**
+     * Safely get a value from the data array
+     */
+    public function get($key) {
+        return $this->data[$key] ?? null;
     }
 }