#!/usr/bin/php
<?php

function error($text) {
	echo $text . "\n";
	exit(1);
}

function output($text) {
    echo $text . "\n";
}

function getJSON($url) {
	$ch = curl_init();
	curl_setopt_array($ch, [
		CURLOPT_URL => $url,
		CURLOPT_RETURNTRANSFER => 1,
		CURLOPT_HTTPHEADER => [
			'User-Agent: ssddanbrown',
		]
	]);
	$data = curl_exec($ch);

	$err = curl_error($ch);
	curl_close($ch);
	if (!empty($err)) error($err);

	return json_decode($data, true);
}

// Check a milestone is provided
if (count($argv) < 2) {
	error("Milestone ID required");
}

// Get milestone info from GitHub
$milestoneID = intval($argv[1]);

$issues = [];
$requestIssues = [];
$page = 1;
$issueURL = 'https://api.github.com/repos/BookStackApp/BookStack/issues?milestone='. $milestoneID .'&state=all';
do {
	$requestIssues = getJSON($issueURL . '&page=' . $page);
	$issues = array_merge($issues, $requestIssues);
	$page++;
} while (count($requestIssues) > 0);

// Get BookStack version and check if a feature or minor release
$milestone = $issues[0]['milestone'];
$versionMatch = [];
preg_match('/v[0-9.]{5,7}/', $milestone['title'], $versionMatch);
$version = $versionMatch[0];
$splitVersion = explode('.', $version);
$isFeature = count($splitVersion) === 2;

// Output title
output("# BookStack {$version}\n");

// Output header text and links
output("### Links\n");
output("- [Update instructions](https://www.bookstackapp.com/docs/admin/updates)");
if ($isFeature) {
    $urlVersion = implode('-', $splitVersion);
    output("- [Update details on blog](https://www.bookstackapp.com/blog/bookstack-release-{$urlVersion}/)");
}

output("\n### Full List of Changes\n");
output("This release contains the following fixes and changes:\n");

// Output issues
foreach ($issues as $issue) {
	$output = '* ';
	$output .= trim($issue['title'], '.') . '.';
	if (isset($issue['pull_request']) && $issue['user']['login'] !== 'ssddanbrown') {
        $output .= " Thanks to [@{$issue['user']['login']}]({$issue['html_url']}).";
    }
	$output .= " ([#{$issue['number']}]({$issue['html_url']}))";
    output($output);
}