<?php
namespace app\common\cache;

use Psr\SimpleCache\CacheInterface;

class SimpleFileCache implements CacheInterface
{
    protected $path;
    protected $prefix;

    public function __construct($path = null, $prefix = 'spreadsheet_')
    {
        $this->path = $path ?? CACHE_PATH;
        $this->prefix = $prefix;

        if (!is_dir($this->path)) {
            mkdir($this->path, 0777, true);
        }
    }

    protected function getFilePath(string $key): string
    {
        return $this->path . DIRECTORY_SEPARATOR . $this->prefix . md5($key) . '.cache';
    }

    public function get($key, $default = null): mixed
    {
        $file = $this->getFilePath($key);
        if (!file_exists($file)) {
            return $default;
        }
        $content = file_get_contents($file);
        $data = unserialize($content);
        if ($data['expire'] !== 0 && $data['expire'] < time()) {
            @unlink($file);
            return $default;
        }
        return $data['value'];
    }

    public function set($key, $value, $ttl = null): bool
    {
        $file = $this->getFilePath($key);
        $expire = $ttl instanceof \DateInterval ? (new \DateTime())->add($ttl)->getTimestamp() : ($ttl ? time() + $ttl : 0);
        $data = [
            'expire' => $expire,
            'value' => $value,
        ];
        return file_put_contents($file, serialize($data)) !== false;
    }

    public function delete($key): bool
    {
        $file = $this->getFilePath($key);
        return file_exists($file) ? unlink($file) : true;
    }

    public function clear(): bool
    {
        $files = glob($this->path . '/' . $this->prefix . '*.cache');
        foreach ($files as $file) {
            unlink($file);
        }
        return true;
    }

    public function getMultiple($keys, $default = null): iterable
    {
        $results = [];
        foreach ($keys as $key) {
            $results[$key] = $this->get($key, $default);
        }
        return $results;
    }

    public function setMultiple($values, $ttl = null): bool
    {
        $success = true;
        foreach ($values as $key => $value) {
            if (!$this->set($key, $value, $ttl)) {
                $success = false;
            }
        }
        return $success;
    }

    public function deleteMultiple($keys): bool
    {
        $success = true;
        foreach ($keys as $key) {
            if (!$this->delete($key)) {
                $success = false;
            }
        }
        return $success;
    }

    public function has($key): bool
    {
        $file = $this->getFilePath($key);
        if (!file_exists($file)) return false;
        $data = unserialize(file_get_contents($file));
        if ($data['expire'] !== 0 && $data['expire'] < time()) {
            @unlink($file);
            return false;
        }
        return true;
    }
}