add this to git finally

database.php

@@ -0,0 +1,214 @@
+<?php
+
+include_once 'utils.php';
+
+$RESULT_MODE = SQLITE3_BOTH;
+
+session_start();
+
+function connectToRedis()
+{
+    $redis_host = '127.0.0.1';
+    $redis_port = 6379;
+
+    try {
+        $redis = new Redis();
+        if ($redis->connect($redis_host, $redis_port)) {
+            /* if ($redis_password) { */
+            /*     $redis->auth($redis_password); */
+            /* } */
+            return $redis;
+        }
+        return false;
+    } catch (Exception $e) {
+        error_log("Redis connection error: ".$e->getMessage());
+        return false;
+    }
+}
+
+function initializeNewUser()
+{
+    $redis = connectToRedis();
+    if (!$redis) {
+        return false;
+    }
+
+    $user_id = generateUUID();
+
+    $redis->hSet('users', $user_id, json_encode([
+        'created_at' => time(),
+        'status' => 'active'
+    ]));
+
+    $db_file = "db/$user_id.db";
+    $db = new SQLite3($db_file);
+
+    $schema_sql = file_get_contents('db/schema.sql');
+    if (!$schema_sql) {
+        error_log("Failed to read schema file: $schema_path");
+        return false;
+    }
+
+    $db->exec($schema_sql);
+
+    if (!$db) {
+        // Cleanup Redis entry if db creation fails
+        $redis->hDel('users', $user_id);
+        return false;
+    }
+    $db->close();
+
+    return ["user_id" => $user_id, "db_file" => "db/$user_id.db"];
+}
+
+function initializeApp($existing_user_id = null)
+{
+    if ($existing_user_id) {
+        /* $_SESSION["user_id"] = $existing_user_id; */
+    } else {
+        return initializeNewUser();
+    }
+}
+
+function getDB($user_id = null)
+{
+    if (!is_null($user_id)) {
+        $db_file = "db/$user_id.db";
+        if (!file_exists($db_file)) {
+            return createUserDatabase($user_id);
+        }
+        return new SQLite3($db_file);
+    }
+}
+
+function registerUser($username, $email, $password)
+{
+    $db = getDB($_COOKIE['user_id']);
+    $query = "INSERT INTO users(username, email, password) values ('$username', '$email', '$password');";
+
+    return $db->exec($query);
+}
+
+function loginUser($email, $password)
+{
+    global $RESULT_MODE;
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT username, password FROM users WHERE email = '$email';";
+    $result = $db->query($query)->fetchArray($RESULT_MODE);
+    if ($result["password"] === $password) {
+        return $result['username'];
+    } else {
+        return null;
+    }
+}
+
+function getUserById($id)
+{
+    global $RESULT_MODE;
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT username, email FROM users WHERE id = $id";
+    try {
+        $result = $db->query($query);
+        return $result->fetchArray($RESULT_MODE);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function createProduct($title, $amountInStock)
+{
+    $db = getDB($_COOKIE['user_id']);
+    $query = "INSERT INTO products(title, amount_in_stock) values ('$title', $amountInStock)";
+
+    try {
+        return $db->exec($query);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getProductsByTitle($title)
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM products WHERE title like '".$title."%'";
+
+    error_log($query, 0);
+    try {
+        $result = $db->query($query);
+        if ($result === false) {
+            error_log("{$db->lastErrorCode()}", 0);
+            throw new Exception($db->lastErrorMsg());
+        }
+
+        $products = [];
+        while ($row = $result->fetchArray($RESULT_MODE)) {
+            $products[] = $row;
+        }
+        return $products;
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getAllProducts()
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM products";
+
+    try {
+        $result = $db->query($query);
+        $products = [];
+        while ($row = $result->fetchArray($RESULT_MODE)) {
+            $products[] = $row;
+        }
+        return $products;
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function deleteProductByTitle($title)
+{
+    $db = getDB($_COOKIE['user_id']);
+    $query = "DELETE FROM products where title='$title'";
+
+    try {
+        return $db->exec($query);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getOrdersForUser($userId)
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM orders WHERE user_id = $userId";
+
+    try {
+        $result = $db->query($query);
+        return $result->fetchArray($RESULT_MODE);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getOrdersForProduct($productId)
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM orders WHERE product_id = $productId";
+
+    try {
+        $result = $db->query($query);
+        return $result->fetchArray($RESULT_MODE);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}