<?php
/**
 * @package     Plumrocket_Base
 * @copyright   Copyright (c) 2020 Plumrocket Inc. (https://plumrocket.com)
 * @license     https://plumrocket.com/license   End-user License Agreement
 */

declare(strict_types=1);

namespace Plumrocket\Base\Model\Extension\Updates;

use Magento\Framework\Config\DataInterface;
use Plumrocket\Base\Api\GetModuleVersionInterface;
use Plumrocket\Base\Model\Extension\Updates\Load as LoadUpdates;

/**
 * @since 2.3.0
 */
class Get
{
    /**
     * @var \Plumrocket\Base\Api\GetModuleVersionInterface
     */
    private $getModuleVersion;

    /**
     * @var LoadUpdates
     */
    private $loadUpdates;

    /**
     * @var \Magento\Framework\Config\DataInterface
     */
    private $extensionsConfig;

    /**
     * GetUpdates constructor.
     *
     * @param \Plumrocket\Base\Api\GetModuleVersionInterface $getModuleVersion
     * @param \Plumrocket\Base\Model\Extension\Updates\Load  $loadUpdates
     * @param \Magento\Framework\Config\DataInterface        $extensionsConfig
     */
    public function __construct(
        GetModuleVersionInterface $getModuleVersion,
        LoadUpdates $loadUpdates,
        DataInterface $extensionsConfig
    ) {
        $this->getModuleVersion = $getModuleVersion;
        $this->loadUpdates = $loadUpdates;
        $this->extensionsConfig = $extensionsConfig;
    }

    /**
     * Get available updates with changelogs.
     *
     * @param array $extensions
     * @return array
     * @throws \Magento\Framework\Exception\NotFoundException if we cannot fetch file with updates
     */
    public function execute(array $extensions): array
    {
        $result = [];

        $updates = $this->loadUpdates->execute();

        foreach ($extensions as $extensionName) {
            if (($metapackageName = $this->getMetapackageName($extensionName)) && isset($updates[$metapackageName])) {
                $changeLogSource = $metapackageName;
            } else {
                $changeLogSource = $extensionName;
            }

            if (isset($updates[$extensionName])) {
                $extensionUpdates = $this->fixBrokenStructure($updates[$changeLogSource]);

                $result[$extensionName] = $this->extractNewReleases(
                    $this->getModuleVersion->execute("Plumrocket_{$extensionName}"),
                    $extensionUpdates
                );
            } else {
                $result[$extensionName] = [];
            }
        }

        return $result;
    }

    /**
     * Filter installed versions.
     *
     * @param string $currentVersion
     * @param array  $updatesInfo
     * @return array
     */
    private function extractNewReleases(string $currentVersion, array $updatesInfo): array
    {
        return array_filter(
            $updatesInfo['changelogs'],
            static function ($changelog) use ($currentVersion) {
                return version_compare($currentVersion, $changelog['version'], '<');
            }
        );
    }

    /**
     * Fix xml structure.
     *
     * When new version has only one changelog, xml can be broken during convert from array.
     * We detect and fix it here.
     *
     * @param array $updatesInfo
     * @return array
     */
    public function fixBrokenStructure(array $updatesInfo): array
    {
        if (! isset($updatesInfo['changelogs'])) {
            $updatesInfo['changelogs'] = [];
            return $updatesInfo;
        }

        if (isset($updatesInfo['changelogs']['version'])) {
            $updatesInfo['changelogs'] = [$updatesInfo['changelogs']];
        }

        $updatesInfo['changelogs'] = $this->fixChangelogsStructure($updatesInfo['changelogs']);

        return $updatesInfo;
    }

    /**
     * Fix xml structure.
     *
     * @param array $changelogs
     * @return array
     */
    private function fixChangelogsStructure(array $changelogs): array
    {
        return array_map(
            static function ($changelog) {
                if (isset($changelog['changes']['type'])) {
                    $changelog['changes'] = [$changelog['changes']];
                }
                return $changelog;
            },
            $changelogs
        );
    }

    /**
     * Get metapackage name.
     *
     * @param string $moduleName
     * @return string
     */
    private function getMetapackageName(string $moduleName): string
    {
        return (string) $this->extensionsConfig->get("$moduleName/metapackage/directory");
    }
}