<?php

namespace Shikiryu\WebGobbler;

class Pool
{
    protected $file_list = [];

    /**
     * @var \Shikiryu\WebGobbler\Collector[]
     */
    protected $collectors = [];

    /**
     * @var string
     */
    protected $pool_directory;

    /**
     * @var int
     */
    protected $nb_images = 0;

    /**
     * Pool constructor.
     *
     * @param array $config
     */
    public function __construct(array $config)
    {
        $collectors = [];
        if (array_key_exists('collectors', $config)) {
            $collectors = $config['collectors'];
        }

        $all_collectors = Collector::getAllCollectors($this);
        if (empty($collectors)) {
            $this->collectors = $all_collectors;
        } else {
            foreach ($all_collectors as $collector) {
                if (in_array($collector->getName(), $collectors, true)) {
                    $this->collectors[] = $collector;
                }
            }
        }

        $pool_dir = $config['directory'];
        if (!is_dir($pool_dir) && !mkdir($pool_dir) && !is_dir($pool_dir)) {
            throw new \RuntimeException(sprintf('Directory "%s" was not created', $pool_dir));
        }

        $this->pool_directory = $pool_dir;

        $this->nb_images = $config['nb_images']; // FIXME

        $this->prepareCollectors();
    }

    public function getPoolDirectory()
    {
        return $this->pool_directory;
    }

    /**
     * @return string
     */
    public function getImage()
    {
        $images = $this->getFileList();

        $index = array_rand($images);
        $image = $images[$index];

        unset($this->file_list[$index]);

        return $image;
    }

    /**
     * @return array
     */
    private function getFileList()
    {
        if (!empty($this->file_list)) {
            return $this->file_list;
        }

        $file_list = [];
        foreach ($this->collectors as $collector) {
            $directory = $collector->getPoolDirectory();
            $file_list = array_merge($file_list, glob($directory.'/*.{jpg,gif,png}', GLOB_BRACE));
        }

        $this->file_list = $file_list;

        return $file_list;
    }

    private function prepareCollectors()
    {
        foreach ($this->collectors as $collector) {
            $directory = $collector->getPoolDirectory();
            $images = glob($directory.'/*.{jpg,gif,png}', GLOB_BRACE);
            if (count($images) < $this->nb_images) {
                $collector->getRandomImages($this->nb_images - count($images));
            }
        }
    }
}