<?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:----ODE5NjM1ODcwMTE4NDUwOSA1Nzk1NjI4MTU1NjU4MTcgNTgwMDkwNjIwMzQ2ODE5NA==