470 lines
14 KiB
PHP
Executable File
470 lines
14 KiB
PHP
Executable File
#!/usr/bin/php
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<?php
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class DbException extends Exception {}
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class AppException extends Exception {}
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enum State
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{
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case Hello;
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case Menu;
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case Items;
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case Checkout;
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case Settins;
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case Exit;
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}
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class DB
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{
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private $pdo;
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/**
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* Initializes database
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*
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* @param string $db_path
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* @throws DbException If there's a database error.
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*/
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public function __construct($db_path)
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{
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try {
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$this->pdo = new PDO("sqlite:" . $db_path);
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$this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
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} catch (PDOException $e) {
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throw new DbException("Connection to DB failed.\nCaused by: " . $e->getMessage());
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}
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try {
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$this->pdo->exec("
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CREATE TABLE IF NOT EXISTS settings (
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name TEXT,
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age TEXT
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);
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");
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if ($this->pdo->query("SELECT COUNT(*) FROM settings;")->fetchColumn() == 0) {
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$this->pdo->exec("INSERT INTO settings (name, age) VALUES ('user', 0);");
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}
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} catch (PDOException $e) {
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throw new DbException("Error initialising settings table.\nCaused by: " . $e->getMessage());
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}
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try {
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$this->pdo->exec("
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CREATE TABLE IF NOT EXISTS items (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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name TEXT NOT NULL,
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price REAL NOT NULL
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);
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");
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if ($this->pdo->query("SELECT COUNT(id) FROM items;")->fetchColumn() == 0) {
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$this->pdo->exec("
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INSERT INTO items (name, price) VALUES ('Молоко пастеризоване', 12);
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INSERT INTO items (name, price) VALUES ('Хліб чорний', 9);
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INSERT INTO items (name, price) VALUES ('Сир білий', 21);
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INSERT INTO items (name, price) VALUES ('Сметана 20%', 25);
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INSERT INTO items (name, price) VALUES ('Кефір 1%', 19);
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INSERT INTO items (name, price) VALUES ('Вода газована', 18);
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INSERT INTO items (name, price) VALUES ('Печиво \"Весна\"', 14);
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");
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}
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} catch (PDOException $e) {
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throw new DbException("Error initialising items table.\nCaused by: " . $e->getMessage());
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}
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try {
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$this->pdo->exec("
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CREATE TABLE IF NOT EXISTS cart (
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id INTEGER NOT NULL UNIQUE,
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count INTEGER NOT NULL,
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FOREIGN KEY(id) REFERENCES item(id)
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);
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");
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} catch (PDOException $e) {
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throw new DbException("Error initialising cart table.\nCaused by: " . $e->getMessage());
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}
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}
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/**
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* Updates user information in the database
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*
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* @param string $name
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* @param int $age
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* @return void
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* @throws DbException If there's a database error.
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*/
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public function update_user($name, $age): void
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{
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try {
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$stmt = $this->pdo->prepare("UPDATE settings SET name = :name, age = :age;");
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$stmt->bindParam(':name', $name, PDO::PARAM_STR);
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$stmt->bindParam(':age', $age, PDO::PARAM_INT);
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$stmt->execute();
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} catch (PDOException $e) {
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throw new DbException("Error updating user info.\nCaused by: " . $e->getMessage());
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}
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}
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/**
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* Fetches all items from the database.
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*
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* @return array[]
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* @throws DbException If there's a database error.
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*/
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public function get_items(): array
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{
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try {
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$stmt = $this->pdo->query("SELECT id, name, price FROM items ORDER BY id;");
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return $stmt->fetchAll(PDO::FETCH_ASSOC);
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} catch (PDOException $e) {
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throw new DbException("Error retrieving data from the items table.\nCaused by: " . $e->getMessage());
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}
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}
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/**
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* Fetches all items in the cart from the database without price info.
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*
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* @return array[]
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* @throws DbException If there's a database error.
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*/
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public function get_cart_no_price(): array
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{
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try {
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$stmt = $this->pdo->query(
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"SELECT name, count FROM cart
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INNER JOIN items ON cart.id = items.id
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ORDER BY cart.id;"
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);
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return $stmt->fetchAll(PDO::FETCH_ASSOC);
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} catch (PDOException $e) {
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throw new DbException("Error inserting init data in the items table.\nCaused by: " . $e->getMessage());
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}
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}
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/**
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* Fetches all items in the cart from the database.
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*
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* @return array[]
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* @throws DbException If there's a database error.
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*/
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public function get_cart(): array
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{
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try {
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$stmt = $this->pdo->query(
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"SELECT
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cart.id, name, price, count, price*count as total_price
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FROM cart
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INNER JOIN items ON cart.id = items.id
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ORDER BY cart.id;"
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);
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return $stmt->fetchAll(PDO::FETCH_ASSOC);
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} catch (PDOException $e) {
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throw new DbException("Error inserting init data in the items table.\nCaused by: " . $e->getMessage());
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}
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}
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/**
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* Add item to the cart
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*
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* @param int $id
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* @param int $count
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*
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* @return bool
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* @throws DbException If there's a database error.
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*/
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public function add_to_cart($id, $count): bool
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{
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try {
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$stmt = $this->pdo->prepare(
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"INSERT INTO cart
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(id, count)
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VALUES
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(:id, :count)
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ON CONFLICT(id)
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DO UPDATE SET
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count = :count
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WHERE id = :id;"
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);
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return $stmt->execute(['id' => $id, 'count' => $count]);
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} catch (PDOException $e) {
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throw new DbException("Error adding item to the cart.\nCaused by: " . $e->getMessage());
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}
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}
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/**
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* Remove an item from the cart
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*
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* @param int $id
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*
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* @return bool
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* @throws DbException If there's a database error.
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*/
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public function remove_from_cart($id): bool
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{
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try {
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$stmt = $this->pdo->prepare("DELETE FROM cart WHERE id = :id");
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return $stmt->execute(['id' => $id]);
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} catch (PDOException $e) {
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throw new DbException("Error removimg item from the cart.\nCaused by: " . $e->getMessage());
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}
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}
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}
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class App
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{
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private $db;
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private $state;
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private $menu_ops = <<<'END'
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1 Вибрати товари
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2 Отримати підсумковий рахунок
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3 Налаштувати свій профіль
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0 Вийти з програми
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END;
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private $hello = <<<'END'
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################################
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# ПРОДОВОЛЬЧИЙ МАГАЗИН "ВЕСНА" #
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################################
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END;
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/**
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* @param string $db_path
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*/
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public function __construct($db_path)
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{
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try {
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$this->db = new DB($db_path);
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$this->state = State::Hello;
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} catch (DbException $e) {
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throw new AppException("Error initializing app.\nCaused by: " . $e);
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}
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}
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public function poll(): void
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{
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while ($this->state != State::Exit) {
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switch ($this->state) {
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case State::Hello:
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$this->hello();
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break;
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case State::Menu:
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$this->menu();
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break;
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case State::Items:
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$this->items();
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break;
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case State::Checkout:
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$this->checkout();
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break;
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case State::Settins:
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$this->settings();
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break;
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default:
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break;
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}
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}
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}
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private function menu(): void
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{
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echo "\n";
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echo "$this->menu_ops\n";
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$op = readline('Введіть команду: ');
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switch ($op) {
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case '1':
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$this->state = State::Items;
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break;
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case '2':
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$this->state = State::Checkout;
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break;
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case '3':
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$this->state = State::Settins;
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break;
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case '0':
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$this->state = State::Exit;
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break;
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default:
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echo "ПОМИЛКА! Введіть правильну команду\n";
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break;
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}
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echo "\n";
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}
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private function hello(): void
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{
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echo "$this->hello\n";
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$this->state = State::Menu;
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}
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private function items(): void
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{
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$items = $this->db->get_items();
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array_unshift($items, ['id' => "№", 'name' => "НАЗВА", 'price' => "ЦІНА"]);
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array_push($items, ['id' => " ", 'name' => "-----------", 'price' => ""]);
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array_push($items, ['id' => "0", 'name' => "ПОВЕРНУТИСЯ", 'price' => ""]);
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$columns = $this->count_columns($items);
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while (true) {
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$this->print_lits($items, $columns);
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$id = readline("Виберіть товар: ");
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if ($id == '0') {
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break;
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}
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echo "\n";
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$selected = null;
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foreach ($items as $item) {
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if ($item['id'] === (int)$id) $selected = $item;
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}
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if ($selected == null) {
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echo "ПОМИЛКА! ВКАЗАНО НЕПРАВИЛЬНИЙ НОМЕР ТОВАРУ\n";
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continue;
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}
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echo "Вибрано: {$selected['name']}\n";
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$count = (int)readline("Введіть кількість, штук: ");
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if ($count > 100) {
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echo "ПОМИЛКА! Не можна додати більше 100 одиниць товару в кошик\n";
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continue;
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}
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if ($count < 0) {
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echo "ПОМИЛКА! Кількість не може бути від'ємною\n";
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continue;
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}
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if ($count == 0) {
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echo "ВИДАЛЯЮ З КОШИКА\n";
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$this->db->remove_from_cart($id);
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} else {
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$this->db->add_to_cart($id, $count);
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}
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$cart = $this->db->get_cart_no_price();
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if (count($cart) == 0) {
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echo "КОШИК ПОРОЖНІЙ\n";
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} else {
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echo "\nУ КОШИКУ:\n";
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array_unshift($cart, ['name' => "НАЗВА", 'count' => "КІЛЬКІСТЬ"]);
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$cart_columns = $this->count_columns($cart);
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$this->print_lits($cart, $cart_columns);
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echo "\n";
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}
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}
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$this->state = State::Menu;
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}
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private function checkout(): void
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{
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$cart = $this->db->get_cart();
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if (count($cart) == 0) {
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echo "КОШИК ПОРОЖНІЙ\n";
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$this->state = State::Menu;
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return;
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} else {
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echo "У КОШИКУ:\n";
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array_unshift($cart, ['id' => "№", 'name' => "НАЗВА", 'price' => "ЦІНА", 'count' => "КІЛЬКІСТЬ", 'total_price' => "ВАРТІСТЬ"]);
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$cart_columns = $this->count_columns($cart);
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$this->print_lits($cart, $cart_columns);
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}
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$total_price = array_reduce($cart, function ($carry, $item) {
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return $carry + (int)$item['total_price'];
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}, 0);
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echo "РАЗОМ ДО СПЛАТИ: {$total_price}\n";
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$this->state = State::Menu;
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}
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private function settings(): void
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{
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while (true) {
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$name = readline("Ваше ім'я: ");
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if ($name !== "" && preg_match("/[a-zA-Z]+/", $name))
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break;
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}
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while (true) {
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$age = readline("Ваш вік: ");
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if (!filter_var($age, FILTER_VALIDATE_INT)) {
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echo "ПОМИЛКА! Вік користувача потрібно вказати числом\n\n";
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continue;
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}
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if ($age < 7 || $age > 150) {
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echo "ПОМИЛКА! Користувач повинен мати вік від 7 та до 150 років\n\n";
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continue;
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}
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break;
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}
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echo "\n";
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$this->db->update_user($name, $age);
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$this->state = State::Menu;
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}
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/**
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* @param array<array> $items
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* @return array<int>
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*/
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private function count_columns($items): array
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{
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$columns = [];
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foreach ($items as $item) {
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foreach ($item as $field => $value) {
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if (!key_exists($field, $columns))
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$columns[$field] = mb_strlen($value);
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else
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$columns[$field] = max(mb_strlen($value), $columns[$field]);
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}
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}
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return $columns;
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}
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/**
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* @param array $element
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* @param array<int> $columns
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*/
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private function pad_row($element, $columns): string
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{
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$result = [];
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foreach ($element as $field => $value)
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$result[] = mb_str_pad($value, $columns[$field], ' ', STR_PAD_RIGHT);
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return implode(" ", $result);
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}
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/**
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* @param array<array> $items
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* @param array<int> $columns
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*/
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private function print_lits($items, $columns): void
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{
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foreach ($items as $item)
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echo $this->pad_row($item, $columns) . "\n";
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}
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}
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try {
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$app = new App("db.sqlite");
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} catch (AppException $e) {
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echo $e;
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exit(1);
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}
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$app->poll();
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