<?php
/**
 * Diese Klasse legt einmalig beim allerersten Start in der exakt korrekten Reihenfolge die Tabellen an
 *
 * @author Niklas Ortmann
 */
class DatabaseInitializer {
    public static function initialize($dbPath) {
        if (!file_exists($dbPath)) {
            try {
                $db = new PDO('sqlite:' . $dbPath);
                $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                $db->exec('PRAGMA foreign_keys = ON;');

                $db->exec("
                    CREATE TABLE IF NOT EXISTS users (
                        email TEXT PRIMARY KEY,
                        vorname TEXT NOT NULL,
                        nachname TEXT NOT NULL,
                        password TEXT NOT NULL
                    );
                ");

                $db->exec("
                    CREATE TABLE IF NOT EXISTS articles (
                        id INTEGER PRIMARY KEY AUTOINCREMENT,
                        title TEXT,
                        content TEXT,
                        author TEXT,
                        category TEXT,
                        tags TEXT,
                        created TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                        FOREIGN KEY (author) REFERENCES users(email) ON DELETE SET NULL ON UPDATE CASCADE
                    );
                ");

                $db->exec("
                    CREATE TABLE IF NOT EXISTS likes (
                        article_id INTEGER,
                        user_id TEXT,
                        PRIMARY KEY (article_id, user_id),
                        FOREIGN KEY (article_id) REFERENCES articles(id) ON DELETE CASCADE,
                        FOREIGN KEY (user_id) REFERENCES users(email) ON DELETE CASCADE
                    );
                ");

                $db->exec("
                    CREATE TABLE IF NOT EXISTS comments (
                        id INTEGER PRIMARY KEY AUTOINCREMENT,
                        article_id INTEGER NOT NULL,
                        parent_comment_id INTEGER NULL,
                        author TEXT NOT NULL,
                        content TEXT NOT NULL,
                        created TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                        FOREIGN KEY (article_id) REFERENCES articles(id) ON DELETE CASCADE,
                        FOREIGN KEY (author) REFERENCES users(email) ON DELETE CASCADE,
                        FOREIGN KEY (parent_comment_id) REFERENCES comments(id) ON DELETE CASCADE
                    );
                ");

            } catch (PDOException $e) {
                throw new RuntimeException("internal-error");
            }
        }
    }
}