<?php

class CodebergBridge extends BridgeAbstract
{
    const NAME = 'Codeberg Bridge';
    const URI = 'https://codeberg.org/';
    const DESCRIPTION = 'Returns commits, issues, pull requests or releases for a repository.';
    const MAINTAINER = 'VerifiedJoseph';
    const PARAMETERS = [
        'Commits' => [
            'branch' => [
                'name' => 'branch',
                'type' => 'text',
                'exampleValue' => 'main',
                'required' => false,
                'title' => 'Optional, main branch is used by default.',
            ],
        ],
        'Issues' => [],
        'Issue Comments' => [
            'issueId' => [
                'name' => 'Issue ID',
                'type' => 'text',
                'required' => true,
                'exampleValue' => '513',
            ]
        ],
        'Pull Requests' => [],
        'Releases' => [],
        'Tags' => [],
        'global' => [
            'username' => [
                'name' => 'Username',
                'type' => 'text',
                'exampleValue' => 'Codeberg',
                'title' => 'Username of account that the repository belongs to.',
                'required' => true,
            ],
            'repo' => [
                'name' => 'Repository',
                'type' => 'text',
                'exampleValue' => 'Community',
                'required' => true,
            ]
        ]
    ];

    const CACHE_TIMEOUT = 1800;

    const TEST_DETECT_PARAMETERS = [
        'https://codeberg.org/Codeberg/Community/issues/507' => [
            'context' => 'Issue Comments', 'username' => 'Codeberg', 'repo' => 'Community', 'issueId' => '507'
        ],
        'https://codeberg.org/Codeberg/Community/issues' => [
            'context' => 'Issues', 'username' => 'Codeberg', 'repo' => 'Community'
        ],
        'https://codeberg.org/Codeberg/Community/pulls' => [
            'context' => 'Pull Requests', 'username' => 'Codeberg', 'repo' => 'Community'
        ],
        'https://codeberg.org/Codeberg/Community/releases' => [
            'context' => 'Releases', 'username' => 'Codeberg', 'repo' => 'Community'
        ],
        'https://codeberg.org/Codeberg/Community/commits/branch/master' => [
            'context' => 'Commits', 'username' => 'Codeberg', 'repo' => 'Community', 'branch' => 'master'
        ],
        'https://codeberg.org/Codeberg/Community/commits' => [
            'context' => 'Commits', 'username' => 'Codeberg', 'repo' => 'Community'
        ]
    ];

    private $defaultBranch = 'main';
    private $issueTitle = '';

    private $urlRegex = '/codeberg\.org\/([\w]+)\/([\w]+)(?:\/commits\/branch\/([\w]+))?/';
    private $issuesUrlRegex = '/codeberg\.org\/([\w]+)\/([\w]+)\/issues/';
    private $pullsUrlRegex = '/codeberg\.org\/([\w]+)\/([\w]+)\/pulls/';
    private $releasesUrlRegex = '/codeberg\.org\/([\w]+)\/([\w]+)\/releases/';
    private $issueCommentsUrlRegex = '/codeberg\.org\/([\w]+)\/([\w]+)\/issues\/([0-9]+)/';

    public function collectData()
    {
        $html = getSimpleHTMLDOM($this->getURI());

        $html = defaultLinkTo($html, $this->getURI());

        switch ($this->queriedContext) {
            case 'Commits':
                $this->extractCommits($html);
                break;
            case 'Issues':
                $this->extractIssues($html);
                break;
            case 'Issue Comments':
                $this->extractIssueComments($html);
                break;
            case 'Pull Requests':
                $this->extractPulls($html);
                break;
            case 'Releases':
                $this->extractReleases($html);
                break;
            case 'Tags':
                $this->extractTags($html);
                break;
            default:
                throw new \Exception('Invalid context: ' . $this->queriedContext);
        }
    }

    public function getName()
    {
        switch ($this->queriedContext) {
            case 'Commits':
                if ($this->getBranch() === $this->defaultBranch) {
                    return $this->getRepo() . ' Commits';
                }

                return $this->getRepo() . ' Commits (' . $this->getBranch() . ' branch) - ' . self::NAME;
            case 'Issues':
                return $this->getRepo() . ' Issues - ' . self::NAME;
            case 'Issue Comments':
                return $this->issueTitle . ' - Issue Comments - ' . self::NAME;
            case 'Pull Requests':
                return $this->getRepo() . ' Pull Requests - ' . self::NAME;
            case 'Releases':
                return $this->getRepo() . ' Releases - ' . self::NAME;
            case 'Tags':
                return $this->getRepo() . ' Tags - ' . self::NAME;
            default:
                return parent::getName();
        }
    }

    public function getURI()
    {
        switch ($this->queriedContext) {
            case 'Commits':
                return self::URI . $this->getRepo() . '/commits/branch/' . $this->getBranch();
            case 'Issues':
                return self::URI . $this->getRepo() . '/issues/';
            case 'Issue Comments':
                return self::URI . $this->getRepo() . '/issues/' . $this->getInput('issueId');
            case 'Pull Requests':
                return self::URI . $this->getRepo() . '/pulls';
            case 'Releases':
                return self::URI . $this->getRepo() . '/releases';
            case 'Tags':
                return self::URI . $this->getRepo() . '/tags';
            default:
                return parent::getURI();
        }
    }

    private function getBranch()
    {
        if ($this->getInput('branch')) {
            return $this->getInput('branch');
        }

        return $this->defaultBranch;
    }

    private function getRepo()
    {
        return $this->getInput('username') . '/' . $this->getInput('repo');
    }

    /**
     * Extract commits
     */
    private function extractCommits($html)
    {
        $table = $html->find('table#commits-table', 0);
        $tbody = $table->find('tbody.commit-list', 0);

        foreach ($tbody->find('tr') as $tr) {
            $item = [];

            $message = $tr->find('td.message', 0);

            $item['title'] = $message->find('span.message-wrapper', 0)->plaintext;
            $item['uri'] = $tr->find('td.sha', 0)->find('a', 0)->href;
            $item['author'] = $tr->find('td.author', 0)->plaintext;
            $item['timestamp'] = $tr->find('td', 3)->find('span', 0)->title;

            if ($message->find('pre.commit-body', 0)) {
                $message->find('pre.commit-body', 0)->style = '';

                $item['content'] = $message->find('pre.commit-body', 0);
            } else {
                $item['content'] = '<blockquote>' . $item['title'] . '</blockquote>';
            }

            $this->items[] = $item;
        }
    }

    /**
     * Extract issues
     */
    private function extractIssues($html)
    {
        $div = $html->find('div.issue.list', 0);

        foreach ($div->find('li.item') as $li) {
            $item = [];

            $number = trim($li->find('a.index,ml-0.mr-2', 0)->plaintext);

            $item['title'] = $li->find('a.title', 0)->plaintext . ' (' . $number . ')';
            $item['uri'] = $li->find('a.title', 0)->href;
            $item['timestamp'] = $li->find('span.time-since', 0)->title;
            $item['author'] = $li->find('div.desc', 0)->find('a', 1)->plaintext;

            // Fetch issue page
            $issuePage = getSimpleHTMLDOMCached($item['uri'], 3600);
            $issuePage = defaultLinkTo($issuePage, self::URI);

            $item['content'] = $issuePage->find('div.timeline-item.comment.first', 0)->find('div.render-content.markup', 0);

            foreach ($li->find('a.ui.label') as $label) {
                $item['categories'][] = $label->plaintext;
            }

            $this->items[] = $item;
        }
    }

    /**
     * Extract issue comments
     */
    private function extractIssueComments($html)
    {
        $this->issueTitle = $html->find('span#issue-title', 0)->plaintext
            . ' (' . $html->find('span.index', 0)->plaintext . ')';

        foreach ($html->find('div.timeline-item.comment') as $div) {
            $item = [];

            if ($div->class === 'timeline-item comment merge box') {
                continue;
            }

            $item['title'] = $this->ellipsisTitle($div->find('div.render-content.markup', 0)->plaintext);
            $item['uri'] = $div->find('span.text.grey', 0)->find('a', 1)->href;
            $item['content'] = $div->find('div.render-content.markup', 0);

            if ($div->find('div.dropzone-attachments', 0)) {
                $item['content'] .= $div->find('div.dropzone-attachments', 0);
            }

            $item['author'] = $div->find('a.author', 0)->innertext;
            $item['timestamp'] = $div->find('span.time-since', 0)->title;

            $this->items[] = $item;
        }
    }

    /**
     * Extract pulls
     */
    private function extractPulls($html)
    {
        $div = $html->find('div.issue.list', 0);

        foreach ($div->find('li.item') as $li) {
            $item = [];

            $number = trim($li->find('a.index,ml-0.mr-2', 0)->plaintext);

            $item['title'] = $li->find('a.title', 0)->plaintext . ' (' . $number . ')';
            $item['uri'] = $li->find('a.title', 0)->href;
            $item['timestamp'] = $li->find('span.time-since', 0)->title;
            $item['author'] = $li->find('div.desc', 0)->find('a', 1)->plaintext;

            // Fetch pull request page
            $pullRequestPage = getSimpleHTMLDOMCached($item['uri'], 3600);
            $pullRequestPage = defaultLinkTo($pullRequestPage, self::URI);

            $item['content'] = $pullRequestPage->find('ui.timeline', 0)->find('div.render-content.markup', 0);

            foreach ($li->find('a.ui.label') as $label) {
                $item['categories'][] = $label->plaintext;
            }

            $this->items[] = $item;
        }
    }

    /**
     * Extract releases
     */
    private function extractReleases($html)
    {
        $ul = $html->find('ul#release-list', 0);

        $lis = $ul->find('li.ui.grid');
        if ($lis === []) {
            throw new \Exception('Found zero releases');
        }
        foreach ($lis as $li) {
            $item = [];
            $item['title'] = $li->find('h4', 0)->plaintext;
            $item['uri'] = $li->find('h4', 0)->find('a', 0)->href;

            $tag = $this->stripSvg($li->find('span.tag', 0));
            $commit = $this->stripSvg($li->find('span.commit', 0));
            $downloads = $this->extractDownloads($li->find('details.download', 0));

            $item['content'] = $li->find('div.markup.desc', 0);
            $item['content'] .= <<<HTML
<strong>Tag</strong>
<p>{$tag}</p>
<strong>Commit</strong>
<p>{$commit}</p>
{$downloads}
HTML;

            $item['timestamp'] = $li->find('span.time', 0)->find('span', 0)->title;
            $item['author'] = $li->find('span.author', 0)->find('a', 0)->plaintext;

            $this->items[] = $item;
        }
    }

    private function extractTags($html)
    {
        $tags = $html->find('td.tag');
        if ($tags === []) {
            throw new \Exception('Found zero tags');
        }
        foreach ($tags as $tag) {
            $this->items[] = [
                'title' => $tag->find('a', 0)->plaintext,
                'uri' => $tag->find('a', 0)->href,
                'content' => $tag->innertext,
            ];
        }
    }

    /**
     * Extract downloads for a releases
     */
    private function extractDownloads($html, $skipFirst = false)
    {
        $downloads = '';

        foreach ($html->find('a') as $index => $a) {
            if ($skipFirst === true && $index === 0) {
                continue;
            }

            $downloads .= <<<HTML
<a href="{$a->herf}">{$a->plaintext}</a><br>
HTML;
        }

        return <<<EOD
<strong>Downloads</strong>
<p>{$downloads}</p>
EOD;
    }

    /**
     * Ellipsis title to first 100 characters
     */
    private function ellipsisTitle($text)
    {
        $length = 100;

        if (strlen($text) > $length) {
            $text = explode('<br>', wordwrap($text, $length, '<br>'));
            return $text[0] . '...';
        }
        return $text;
    }

    /**
     * Strip SVG tag
     */
    private function stripSvg($html)
    {
        if ($html->find('svg', 0)) {
            $html->find('svg', 0)->outertext = '';
        }

        return $html;
    }

    public function detectParameters($url)
    {
        $params = [];

        // Issue Comments
        if (preg_match($this->issueCommentsUrlRegex, $url, $matches)) {
            $params['context'] = 'Issue Comments';
            $params['username'] = $matches[1];
            $params['repo'] = $matches[2];
            $params['issueId'] = $matches[3];

            return $params;
        }

        // Issues
        if (preg_match($this->issuesUrlRegex, $url, $matches)) {
            $params['context'] = 'Issues';
            $params['username'] = $matches[1];
            $params['repo'] = $matches[2];

            return $params;
        }

        // Pull Requests
        if (preg_match($this->pullsUrlRegex, $url, $matches)) {
            $params['context'] = 'Pull Requests';
            $params['username'] = $matches[1];
            $params['repo'] = $matches[2];

            return $params;
        }

        // Releases
        if (preg_match($this->releasesUrlRegex, $url, $matches)) {
            $params['context'] = 'Releases';
            $params['username'] = $matches[1];
            $params['repo'] = $matches[2];

            return $params;
        }

        // Commits
        if (preg_match($this->urlRegex, $url, $matches)) {
            $params['context'] = 'Commits';
            $params['username'] = $matches[1];
            $params['repo'] = $matches[2];

            if (isset($matches[3])) {
                $params['branch'] = $matches[3];
            }

            return $params;
        }

        return null;
    }
}