<?php

/*
Plugin Name: Gitlab REST API Shortcodes
Plugin URI: http://tk-sls.de/ref/gitlab-list-commits
Description: <p>Summary: Embed list of most recent commits to a Gitlab project from a Gitlab instance's public REST API.</p><p>Example: Add [gitlab-list-commits url=https://tk-sls.de/gitlab project_id=42 since="3 month" max=5] for a list of at most 5 commits to that project that were made since at most 3 months ago.</p><p>The attributes "url" and "project_id" are mandatory.</p><p>The attributes "since" and "max" are optional (beware, the default is an unlimited list of commits).</p><p>Other optional attributes:</p><ul><li>ref_name=STRING: List only commit from branch or reference name STRING.</li><li>default_branch: If set, list only commits from the project's default branch.</li></ul>
Author: Tilman Kranz
Version: 1.1
Author URI: https://tk-sls.de
*/

class LinuxfooGitlab {
	public function __construct() {
	}

    static function css() {
	    wp_enqueue_style('linuxfoo_gitlab_css', plugins_url('styles.css', __FILE__ ), '', '1.1' );
    }

	static function error ( $msg ) {
        return
            '<div class="linuxfoo_gitlab">'.
                '<span class="error">'.
                    $msg.
                '</span>'.
            '</div>';
    }

	static function list_commits($atts, $content, $tag) {
		global $post;

        if(
            is_null($atts['url']) ||
            is_null($atts['project_id'])
        ) {
            return self::error(__('Required parameter missing.', 'linuxfoo-gitlab'));
        }

        $project_url = $atts['url'].'/api/v4/projects/'.$atts['project_id'];
        $project_json = file_get_contents($project_url);

        if(is_null($project_json)) {
            return self::error(__('Project URL not reachable.', 'linuxfoo-gitlab'));
        }

        $project = json_decode($project_json);

        if(is_null($project)) {
            return self::error('Project information not readable.');
        }

        $project_header =
            '<span class="project_header">'.
                'Gitlab project'.' <a href="'.$project->web_url.'">'.$project->name.'</a>'.
            '</span>';

        $commits_url = $project_url.'/repository/commits?';

        if(!is_null($atts['since'])) {
            $since = date(DATE_ISO8601, strtotime('-'.$atts['since']));
            $commits_url .= '&since='.$since;
        }

        if(!is_null($atts['ref_name'])) {
            $commits_url .= '&ref_name='.$atts['ref_name'];
            $branch = $atts['ref_name'];
        }
        elseif(!is_null($atts['default_branch'])) {
            $commits_url .= '&ref_name='.$project->default_branch;
            $branch = $project->default_branch;
        }
        else {
            $branch = null;
        }

        $commits_json = file_get_contents($commits_url);

        if(is_null($project_json)) {
            return self::error(__('Commits URL not reachable.', 'linuxfoo-gitlab'));
        }

        $commits = json_decode($commits_json);

        if(is_null($project)) {
            return self::error(__('Commits information not readable.', 'linuxfoo-gitlab'));
        }

        $commits_count = count($commits); 
        $commits_count = is_null($atts['max']) ? $commits_count : min($commits_count, $atts['max']);

        if($commits_count==0) {
            return 
                '<div class="linuxfoo_gitlab">'.
                    $project_header.
                    '<span class="stats">'.
                        __('No commits', 'linuxfoo-gitlab').
                        (is_null($branch) ? '' : ' '.__('in branch', 'linuxfoo-gitlab').' "'.$branch.'"').
                        (is_null($atts['since']) ? '' : ' since '.$atts['since'].' ago').'.'.
                    '</span>'.
                '</div>';
        }

        $commits = array_slice($commits, 0, $commits_count);

        $out =
            '<div class="linuxfoo_gitlab">'.
                $project_header.
                    '<span class="stats">'.
                        sprintf(__('Last %d commits', 'linuxfoo-gitlab'), $commits_count).
                        (is_null($branch) ? '' : ' '.__('in branch', 'linuxfoo-gitlab').' "'.$branch.'"').
                        (is_null($atts['since']) ? '' : ' since '.$atts['since'].' ago').':'.
                    '</span>'.
                '<ul class="commits">';

        foreach($commits as $commit) {
            preg_match('/^....-..-../', $commit->committed_date, $m);
            $date = $m[0];

            $title = htmlspecialchars($commit->title, ENT_NOQUOTES|ENT_HTML5|ENT_SUBSTITUTE, 'UTF-8', FALSE);

            $out .=
                '<li>'.
                    $date.': <a href="'.$commit->web_url.'">'.$commit->short_id.'</a> '.$title.
                '</li>';
        }

        $out .=
                '</ul>'.
            '</div>';

        return $out;
    }

    static function load_textdomain() {
        load_plugin_textdomain('linuxfoo-gitlab', false, dirname(plugin_basename(__FILE__)).'/lang');
    }
}

add_action('plugins_loaded', 'LinuxfooGitlab::load_textdomain');
add_action('wp_enqueue_scripts', 'LinuxfooGitlab::css' );
add_shortcode('gitlab-list-commits', 'LinuxfooGitlab::list_commits');