<?php


namespace Kiri\Pool;


use Exception;


/**
 * Class Pool
 * @package Kiri\Pool
 */
class Pool implements PoolInterface
{

	/** @var array<PoolItem> */
	protected array $_connections = [];


	/**
	 * @param $name
	 * @param $retain_number
	 * @throws Exception
	 */
	public function flush($name, $retain_number): void
	{
		if ($this->hasChannel($name)) {
            $this->channel($name)->tailor($retain_number);
		}
	}


	/**
	 * @param PoolItem $channel
	 * @param $retain_number
	 */
	protected function pop(PoolItem $channel, $retain_number): void
	{
		$channel->tailor($retain_number);
	}


    /**
     * @param $name
     * @param int $max
     * @param callable $closure
     */
	public function created($name, int $max, callable $closure): void
	{
		if (!isset($this->_connections[$name])) {
			$this->_connections[$name] = new PoolItem($max, $closure);
		}
	}


	/**
	 * @param $name
	 * @return PoolItem
	 * @throws Exception
	 */
	public function channel($name): PoolItem
	{
		if (!isset($this->_connections[$name])) {
			throw new Exception('Channel is not exists.');
		}
		$channel = $this->_connections[$name];
        if ($channel->isClose()) {
            $channel->reconnect();
        }
        return $channel;
	}


    /**
     * @param $name
     * @return bool
     */
	public function hasChannel($name): bool
	{
		return isset($this->_connections[$name]) && $this->_connections[$name] instanceof PoolItem;
	}


    /**
     * @param string $name
     * @return array
     * @throws Exception
     */
	public function get(string $name): mixed
	{
		return $this->channel($name)->pop();
	}


    /**
     * @param $name
     * @return bool
     * @throws Exception
     */
	public function isNull($name): bool
	{
		return $this->channel($name)->isEmpty();
	}


	/**
	 * @param string $name
	 * @param mixed $client
	 * @return bool
	 * 检查连接可靠性
	 */
	public function checkCanUse(string $name, mixed $client): bool
	{
		return true;
	}


	/**
	 * @param string $name
	 * @return bool
	 */
	public function hasItem(string $name): bool
	{
		$channel = $this->_connections[$name] ?? null;
		if ($channel === null) {
			return false;
		}
		return !$channel->isEmpty();
	}


	/**
	 * @param string $name
	 * @return int
	 */
	public function size(string $name): int
	{
		$channel = $this->_connections[$name] ?? null;
		if ($channel === null) {
			return 0;
		}
		return $channel->size();
	}


    /**
     * @param string $name
     * @param mixed $data
     * @throws Exception
     */
	public function push(string $name, mixed $data): void
	{
		$this->channel($name)->push($data);
	}


    /**
     * @param $name
     * @param int $time
     * @return array
     * @throws Exception
     */
	public function waite($name, int $time = 30): mixed
	{
		return $this->channel($name)->pop($time);
	}


	/**
	 * @param string $name
	 * @throws Exception
	 */
	public function close(string $name): void
	{
		$channel = $this->_connections[$name] ?? null;
		if ($channel === null) {
			return;
		}
		$channel->tailor(0);
		$channel->close();
	}


	/**
     * return pool queue lists
	 * @return PoolItem[]
	 */
	protected function channels(): array
	{
		return $this->_connections;
	}


    /**
     * @param string $name
     * @param mixed $client
     * @return void
     * @throws Exception
     */
    public function release(string $name, mixed $client): void
    {
        // TODO: Implement release() method.
        $this->channel($name)->push($client);
    }
}