<?php

namespace CleantalkSP\Common;

abstract class Counter
{
    use \CleantalkSP\Templates\Singleton;

    protected static $default_time_interval__insert = 3600;
    protected static $default_time_interval__get = 86400;

    /**
     * @psalm-suppress PossiblyUnusedProperty
     */
    protected $structure = array();
    protected $data = array();
    protected $current_interval_name__insert;
    protected $current_interval_name__get;

    public function init()
    {
        static::initCounters();
    }

    abstract protected function initCounters();

    abstract protected function setCounters();

    public static function increment($name, $increment = 1, $save_flag = true)
    {
        static::getInstance()->incrementCounter($name, $increment, $save_flag);
    }

    public static function get($name)
    {
        return static::getInstance()->getCounter($name);
    }

    protected function getCounter($name, $out = 0)
    {
        foreach ($this->data as $interval_name => $data) {
            if ($this->current_interval_name__get <= $interval_name && isset($data[ $name ])) {
                $out += $data[ $name ];
            }
        }

        return $out;
    }

    protected function incrementCounter($name, $increment, $save_flag)
    {
        // Default structure if interval isn't set
        if ( ! isset($this->data[ $this->current_interval_name__insert ])) {
            $this->data[ $this->current_interval_name__insert ] = array();
        }

        if ( ! isset($this->data[ $this->current_interval_name__insert ][ $name ])) {
            $this->data[ $this->current_interval_name__insert ][ $name ] = 0;
        }

        // Increasing counter
        $this->data[ $this->current_interval_name__insert ][ $name ] += $increment;

        // Deleting excessive oldest interval. But only one.
        if (count($this->data) > self::$default_time_interval__get / self::$default_time_interval__insert) {
            unset($this->data[ min(array_keys($this->data)) ]);
        }

        $save_flag && $this->setCounters();
    }
}