<?php

namespace Desarrolla2\Cache;

use Desarrolla2\Cache\Exception\InvalidArgumentException;
use Desarrolla2\Cache\Exception\UnexpectedValueException;
use Desarrolla2\Cache\Packer\PackerInterface;
use Desarrolla2\Cache\Packer\SerializePacker;

/**
 * Cache file.
 */
class File extends AbstractFile
{
    /** @var string  'embed', 'file', 'mtime' */
    protected $ttlStrategy = 'embed';

    /**
     * Create the default packer for this cache implementation
     *
     * @return PackerInterface
     */
    protected static function createDefaultPacker(): PackerInterface
    {
        return new SerializePacker();
    }

    /**
     * Set TTL strategy
     *
     * @param string $strategy
     */
    protected function setTtlStrategyOption($strategy)
    {
        if (!in_array($strategy, ['embed', 'file', 'mtime'])) {
            throw new InvalidArgumentException("Unknown strategy '$strategy', should be 'embed', 'file' or 'mtime'");
        }

        $this->ttlStrategy = $strategy;
    }

    /**
     * Get TTL strategy
     *
     * @return string
     */
    protected function getTtlStrategyOption(): string
    {
        return $this->ttlStrategy;
    }

    /**
     * Get the TTL using one of the strategies
     *
     * @param string $cacheFile
     * @return int
     */
    protected function getTtl(string $cacheFile)
    {
        switch ($this->ttlStrategy) {
            case 'embed':
                return (int)$this->readLine($cacheFile);
            case 'file':
                return file_exists("$cacheFile.ttl")
                    ? (int)file_get_contents("$cacheFile.ttl")
                    : PHP_INT_MAX;
            case 'mtime':
                return $this->ttl > 0 ? filemtime($cacheFile) + $this->ttl : PHP_INT_MAX;
        }

        throw new \InvalidArgumentException("Invalid TTL strategy '{$this->ttlStrategy}'");
    }

    /**
     * Set the TTL using one of the strategies
     *
     * @param int|null $expiration
     * @param string   $contents
     * @param string   $cacheFile
     * @return string  The (modified) contents
     */
    protected function setTtl($expiration, $contents, $cacheFile)
    {
        switch ($this->ttlStrategy) {
            case 'embed':
                $contents = ($expiration ?? PHP_INT_MAX) . "\n" . $contents;
                break;
            case 'file':
                if ($expiration !== null) {
                    file_put_contents("$cacheFile.ttl", $expiration);
                }
                break;
            case 'mtime':
                // nothing
                break;
        }

        return $contents;
    }

    /**
     * {@inheritdoc}
     */
    public function get($key, $default = null)
    {
        $cacheFile = $this->getFilename($key);

        if (!file_exists($cacheFile)) {
            return $default;
        }

        if ($this->ttlStrategy === 'embed') {
            [$ttl, $packed] = explode("\n", $this->readFile($cacheFile), 2);
        } else {
            $ttl = $this->getTtl($cacheFile);
        }

        if ((int)$ttl <= time()) {
            $this->deleteFile($cacheFile);
            return $default;
        }

        if (!isset($packed)) {
            $packed = $this->readFile($cacheFile); // Other ttl strategy than embed
        }

        return $this->unpack($packed);
    }

    /**
     * {@inheritdoc}
     */
    public function has($key)
    {
        $cacheFile = $this->getFilename($key);

        if (!file_exists($cacheFile)) {
            return false;
        }

        $ttl = $this->getTtl($cacheFile);

        if ($ttl <= time()) {
            $this->deleteFile($cacheFile);
            return false;
        }

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function set($key, $value, $ttl = null)
    {
        $cacheFile = $this->getFilename($key);
        $packed = $this->pack($value);

        if (!is_string($packed)) {
            throw new UnexpectedValueException("Packer must create a string for the data to be cached to file");
        }

        $contents = $this->setTtl($this->ttlToTimestamp($ttl), $packed, $cacheFile);

        return $this->writeFile($cacheFile, $contents);
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjkwMDgxOTcyNDE2NTExNCAyNzcxMDI4Mjg4MDQ3MzAyIDgxNDIyNzAwOTk4MzcwOTQ=