<?php
class KeyValue {
	protected static $kv = null;

	public static function get(string $keyname, ?string $channel = null) {
		if (self::$kv === null) {
			self::load();
		}

		if ($channel === null) {
			$channel = "all";
		}

		if (isset(self::$kv[$keyname][$channel])) {
			return self::$kv[$keyname][$channel];
		}

		return null;
	}

	public static function save(string $keyname, string $value, ?string $channel = null) {
		if (self::$kv === null) {
			self::load();
		}

		if ($channel === null) {
			$channel = "all";
		}

		$db = new Database();
		$stmt = $db::$handle->prepare("INSERT OR REPLACE INTO `keyvalue` (`key`, `value`, `channel`, `created`) VALUES (:key, :value, :channel, strftime('%Y-%m-%d %H:%M:%S','now'))");
		$stmt->bindValue(":key", $keyname, SQLITE3_TEXT);
		$stmt->bindValue(":value", $value, SQLITE3_TEXT);
		$stmt->bindValue(":channel", $channel, SQLITE3_TEXT);
		$stmt->execute();

		self::$kv[$keyname][$channel] = $value;
	}

	protected static function load() {
		$db = new Database();
		$stmt = $db::$handle->prepare("SELECT * FROM `keyvalue`");
		$result = $stmt->execute();
		while ($row = $result->fetchArray(SQLITE3_ASSOC)) {
			$channel = $row["channel"];
			if ($channel === null) {
				$channel = "all";
			}

			self::$kv[$row["key"]][$channel] = $row["value"];
		}
	}
}