#!/usr/bin/php
<?php
/*
* This will find all issues with RRULE: in the body
* 1. extract the RRULE string and calculate the recurring dates.
* 2. if the rule is due to occure today then:
* 2a. if the issue is closed then it will re-open it,
* 2b. and it will add a comment "Today!"
*/

// load the config, create the connection and load the repo sepcified on the cmd line args
// we will then have $client and $repo available
require('setup.php');

use RRule\RRule;

//function to add/replace the tag with our text
/*
function updateIssueBody($issue,$text){
  $issue->addComment($text);
  return;

  // add a tag to the body if to doesn't exist
  if( strpos($issue->body,'<!--BOT-->')===false ){
    $issue->body.="\n<!--BOT--><hr/><!--ENDBOT-->";
  }
  //replace the tag contents with the result from our $text function
  $issue->body=preg_replace("#<!--BOT-->.*?<!--ENDBOT-->#s",'<!--BOT--><hr/>'.$text.'<!--ENDBOT-->',$issue->body);
  $issue->save();
};
*/

//loop through each issue that has a RRULE
$issues=array_merge(
  $repo->getIssues(['q'=>'RRULE:']),
  $repo->getIssues(['q'=>'RRULE:','state'=>'closed'])
);
foreach($issues as $issue){
  echo "\n\n### ".$issue->number.": ".$issue->title."\n";
  //extract the rule text
	if(preg_match('/RRULE:\s?(.*)/',$issue->body,$matches)){
		$rruletxt=$matches[1];
    //create the rule, report any exceptions
		try{
			$rrule = new RRule($rruletxt);
		}catch(Exception $e){
			$result="Error in RRULE\n```plain\n".$e->getMessage()."\n\n$rruletxt\n```\n";
      $issue->addComment($result);
      continue;
		}
  }else{ //couldn't extract, report error
    $issue->addComment("Can't extract RRULE:");
    continue;
  }

  // if we get here, then there is a valid rrule :)

  // calcultate some useful info
  $next_inc=$rrule->getOccurrencesAfter(date('Y-m-d'),$inclusive=true,$limit=1)[0];
  $next_exc=$rrule->getOccurrencesAfter(date('Y-m-d'),$inclusive=false,$limit=1)[0];
  $today=$next_inc->format('Y-m-d')==date('Y-m-d');

  if($debug){
    echo $rrule->humanReadable().
    "\n NOW: ".date('Y-m-d').
    "\n First: ".$rrule[0]->format('Y-m-d').
    "\n Second: ".$rrule[1]->format('Y-m-d').
    "\n Today: ".($today?'Yes':'no').
    "\n Next Inc: ".$next_inc->format('Y-m-d').
    "\n Next Exc: ".$next_exc->format('Y-m-d').
    "\n";
  }

  //is it today?
  if($today){
    echo "@Today\n";
    if($issue->state=='closed'){
      $issue->state='open';
      $issue->save();
    }
    $issue->addComment("Today!!\n\nNext: ".$next_exc->format('Y-m-d'));
  }

  // not working https://github.com/go-gitea/gitea/issues/8179
	//$issue->due_date=$rrule[0]->format('c');
  //$issue->save();
  //if( date('Y-m-d',strtotime($issue->due_date)) != $next_exc->format('Y-m-d') ){
  if( $issue->due_date ){
    if( strtotime(date('Y-m-d',strtotime($issue->due_date))) < strtotime($next_exc->format('Y-m-d')) ){
      echo "@Overdue\n";
      $issue->addComment("Overdue!!\n\nNext: ".$next_exc->format('Y-m-d'));
    }
  }else{
    $issue->setDueDate($next_exc);
  }
}