<?php

    function getIssues() {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'https://git.YOUR_URL_HERE/api/v1/repos/YOUR_ORG/YOUR_REPO/issues?state=open&type=issues&limit=1000&access_token=YOUR_GITEA_ACCESS_TOKEN');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
        $result = json_decode(curl_exec($ch), true);
        curl_close($ch);
        return $result;
    }

    function getCommentsOnIssue($issueId) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "https://git.YOUR_URL_HERE/api/v1/repos/YOUR_ORG/YOUR_REPO/issues/$issueId/comments?access_token=YOUR_GITEA_ACCESS_TOKEN");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
        $result = json_decode(curl_exec($ch), true);
        curl_close($ch);
        return $result;
    }

    function patchIssue($issueId, $body) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "https://git.YOUR_URL_HERE/api/v1/repos/YOUR_ORG/YOUR_REPO/issues/$issueId?access_token=YOUR_GITEA_ACCESS_TOKEN");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PATCH');

        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
            "state" => "closed",
            "body" => $body
        ]));

        $headers = array();
        $headers[] = 'Accept: application/json';
        $headers[] = 'Content-Type: application/json';
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

        $result = json_decode(curl_exec($ch), true);
        curl_close($ch);
        return $result;
    }

    function op_request($req, $method = 'POST', $data = null) {
        $ch = curl_init();
        if(preg_match('~^/api/v3(.*)~', $req, $temp)) $req = $temp[1];

        curl_setopt( $ch, CURLOPT_URL, 'https://openproject.YOUR_URL_HERE/api/v3' . $req );
        curl_setopt( $ch, CURLOPT_USERPWD, "apikey:YOUR_OPEN_PROJECT_APIKEY" );
        curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE );

        if(isset($data)) {
            $data = json_encode($data);
            curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, $method);
            curl_setopt( $ch, CURLOPT_POSTFIELDS, $data);
            curl_setopt( $ch, CURLOPT_HTTPHEADER, [
                'Content-Type: application/json',
                'Content-Length: '.strlen($data)
            ]);
        }

        $return = curl_exec($ch);
        curl_close($ch);
        return json_decode($return, true);
    }

    function parseDescription($description) {
        preg_match_all('/#\d+/', $description, $matches);
        foreach(($matches[0] ?? []) as $match) {
            $id = substr($match, 1);
            $url = "https://git.YOUR_URL_HERE/YOUR_ORG/YOUR_REPO/issues/$id";
            $description = str_replace($match, "[G$id]($url)", $description);
        }
        return $description;
    }

    $issues = getIssues();
    foreach($issues as $i => $issue) {
        $issues[$i]["comments"] = getCommentsOnIssue($issue["number"]);
    }

    $projectId = 14;
    foreach($issues as $issue) {
        echo "Migrating issue $issue[number]\n";

        // Parse the description
        $description = "";
        if(!empty($issue["body"])) $description .= "$issue[body]\n\n";
        $description .= "Ticket source (archived): $issue[html_url]";
        $description = parseDescription($description);

        // RePost the ticket
        $ticket = op_request("/api/v3/projects/$projectId/work_packages", data: [
            "subject" => $issue["title"],
            "description" => [
                "format" => "markdown",
                "raw" => $description
            ],
            "scheduleManually" => false,
            "startDate" => date("Y-m-d", strtotime($issue["created_at"])), 
            "dueDate" => null,
            "estimatedTime" => null
        ]);

        // RePost comments
        foreach($issue["comments"] as $comment) {
            $comment = op_request("/api/v3/work_packages/$ticket[id]/activities", data: [
                "notify" => false,
                "comment" => [
                    "raw" => parseDescription($comment["body"])
                ]
            ]);
        }

        $oldDescription = "Migrated to: https://openproject.YOUR_URL_HERE/projects/YOUR_PROJECT_NAME_OR_ID/work_packages/$ticket[id]";
        if(!empty($issue["body"])) $oldDescription .= "\n\n$issue[body]";
        patchIssue($issue["number"], $oldDescription);
    }

?>