<?php
namespace taskman;
use Exception;

task('git_info', function()
{ 
  list($rev_hash, $branch, $revision_number) = git_get_info();
  $info = "==============GIT INFO==============\n"
    . "$rev_hash - hash\n"
    . "$branch - branch\n"
    . "$revision_number - revision\n";
  echo $info;
});

function git_do($repo, $action, &$out = NULL, $verbose = true)
{
  $cli = "cd $repo && git $action";
  if($verbose)
    echo "Git CLI: $cli\n";
  exec($cli, $out, $result);
  if($verbose || $result !== 0)
    echo implode("\n", $out)."\n";
  if($result !== 0)
    throw new Exception("Error executing command: $cli ($result)");
}

function git_is_repo($directory)
{
  $output = [];
  git_do($directory, "rev-parse --is-inside-work-tree", $output, false);
  return !empty($output) && $output[0] === 'true';
}

function git_rev_from_commit_message($message)
{
  // Regular expression pattern to extract the commit hash
  $pattern = '/\b[0-9a-f]{7,40}\b/';

  // Extract the commit hash from the message
  preg_match($pattern, $message, $matches);
  $commit_hash = $matches[0] ?? '';
  return $commit_hash;
}

function get_git_last_remote_tag($repo)
{
  $remote_tags = [];
  git_do($repo, 'ls-remote --tags origin', $output, false);
  foreach($output as $line)
  {
    $items = explode("\t", trim($line));
    if(sizeof($items) < 2)
      continue;
    $tag_spec = $items[1];
    if(str_ends_with($tag_spec, '^{}'))
      continue;
    $tag = str_replace('refs/tags/', '', $tag_spec);
    $remote_tags[] = $tag;
  }
  return _get_last_version_tag($remote_tags);
}

function _get_last_version_tag(array $tags)
{
  if(!$tags)
    return false;
  usort($tags, function ($tag1, $tag2) {
    $version1 = str_replace('v', '', $tag1);
    $version2 = str_replace('v', '', $tag2);
    return version_compare($version1, $version2);
  });
  return end($tags);
}

class GitVersion
{
  public $major;
  public $minor;
  public $patch;

  static function parse($version_str)
  {
    $parts = explode('.', $version_str);
    if(sizeof($parts) != 3)
      throw new Exception("Invalid version string: $version_str"); 
    $v = new GitVersion();
    if($parts[0][0] === 'v')
      $parts[0] = substr($parts[0], 1);
    $v->major = (int)$parts[0];
    $v->minor = (int)$parts[1];
    $v->patch = (int)$parts[2];
    return $v;
  }

  function bump($up_mode)
  {
    if($up_mode == 1)
      ++$this->patch;
    else if($up_mode == 2)
    {
      ++$this->minor;
      $this->patch = 0;
    }
    else if($up_mode == 3)
    {
      ++$this->major;
      $this->minor = 0;
      $this->patch = 0;
    }
    else
      throw new Exception("Unsupported up mode: $up_mode");
  }

  function encode()
  {
    return 'v'.$this->major.'.'.$this->minor.'.'.$this->patch;
  }
}