Dave Jarvis' Repositories

<?php
require_once __DIR__ . '/BasePage.php';
require_once __DIR__ . '/../git/GitDiff.php';
require_once __DIR__ . '/../model/UrlBuilder.php';

class DiffPage extends BasePage {
  private $currentRepo;
  private $git;
  private $hash;

  public function __construct(
    array $repositories,
    array $currentRepo,
    Git $git,
    string $hash
  ) {
    parent::__construct( $repositories, substr( $hash, 0, 7 ) );

    $this->currentRepo = $currentRepo;
    $this->git         = $git;
    $this->hash        = $hash;
  }

  public function render() {
    $this->renderLayout( function() {
      $commitData = $this->git->read( $this->hash );
      $diffEngine = new GitDiff( $this->git );
      $lines      = explode( "\n", $commitData );
      $msg        = '';
      $isMsg      = false;
      $headers    = [];

      foreach( $lines as $line ) {
        if( $line === '' ) {
          $isMsg = true;
        } elseif( $isMsg ) {
          $msg .= $line . "\n";
        } else {
          if( preg_match( '/^(\w+) (.*)$/', $line, $m ) ) {
            $headers[$m[1]] = $m[2];
          }
        }
      }

      $changes = iterator_to_array( $diffEngine->compare( $this->hash ) );
      $added   = 0;
      $deleted = 0;

      foreach( $changes as $change ) {
        if( isset( $change['hunks'] ) ) {
          foreach( $change['hunks'] as $hunkLine ) {
            if( isset( $hunkLine['t'] ) ) {
              if( $hunkLine['t'] === '+' ) {
                $added++;
              } elseif( $hunkLine['t'] === '-' ) {
                $deleted++;
              }
            }
          }
        }
      }

      $commitsUrl = (new UrlBuilder())
        ->withRepo( $this->currentRepo['safe_name'] )
        ->withAction( 'commits' )
        ->build();

      $this->renderBreadcrumbs( $this->currentRepo, [
        '<a href="' . $commitsUrl . '">Commits</a>',
        substr( $this->hash, 0, 7 )
      ] );

      $authorRaw  = $headers['author'] ?? 'Unknown';
      $authorName = preg_replace( '/<[^>]+>/', '<email>', $authorRaw );
      $authorName = htmlspecialchars( $authorName );
      $commitDate = '';

      if( preg_match( '/^(.*?) <.*?> (\d+) ([-+]\d{4})$/', $authorRaw, $m ) ) {
        $authorName = htmlspecialchars( $m[1] ) . ' &lt;email&gt;';
        $timestamp  = (int)$m[2];
        $offsetStr  = $m[3];
        $pattern    = '/([-+])(\d{2})(\d{2})/';
        $tzString   = preg_replace( $pattern, '$1$2:$3', $offsetStr );
        $dt         = new DateTime( '@' . $timestamp );

        $dt->setTimezone( new DateTimeZone( $tzString ) );

        $commitDate = $dt->format( 'Y-m-d H:i:s \G\M\TO' );
      }

      echo '<div class="commit-details">';
      echo '<div class="commit-header">';
      echo '<h1 class="commit-title">' .
           htmlspecialchars( trim( $msg ) ) . '</h1>';

      echo '<table class="commit-info-table"><tbody>';

      echo '<tr>' .
           '<th class="commit-info-label">Author</th>' .
           '<td class="commit-info-value">' .
           $authorName . '</td></tr>';

      if( $commitDate !== '' ) {
        echo '<tr>' .
             '<th class="commit-info-label">Date</th>' .
             '<td class="commit-info-value">' .
             $commitDate . '</td></tr>';
      }

      echo '<tr>' .
           '<th class="commit-info-label">Commit</th>' .
           '<td class="commit-info-value">' .
           $this->hash . '</td></tr>';

      if( isset( $headers['parent'] ) ) {
        $url = (new UrlBuilder())
          ->withRepo( $this->currentRepo['safe_name'] )
          ->withAction( 'commit' )
          ->withHash( $headers['parent'] )
          ->build();

        echo '<tr>' .
             '<th class="commit-info-label">Parent</th>' .
             '<td class="commit-info-value">';
        echo '<a href="' . $url . '" class="parent-link">' .
             substr( $headers['parent'], 0, 7 ) . '</a>';
        echo '</td></tr>';
      }

      $diffNet   = $added - $deleted;
      $pluralize = function( int $count ): string {
        $suffix = '';

        if( $count !== 1 ) {
          $suffix = 's';
        }

        return $count . ' line' . $suffix;
      };

      $deltaMsg = $pluralize( $added ) . ' added, ' .
                  $pluralize( $deleted ) . ' removed';

      if( $diffNet !== 0 ) {
        $direction = $diffNet > 0 ? 'increase' : 'decrease';
        $deltaMsg .= ', ' . abs( $diffNet ) . "-line $direction";
      }

      echo '<tr>' .
           '<th class="commit-info-label">Delta</th>' .
           '<td class="commit-info-value">' .
           $deltaMsg . '</td></tr>';

      echo '</tbody></table></div></div>';

      echo '<div class="diff-container">';

      foreach( $changes as $change ) {
        $this->renderFileDiff( $change );
      }

      if( empty( $changes ) ) {
        echo '<div class="empty-state"><p>No changes detected.</p></div>';
      }

      echo '</div>';
    }, $this->currentRepo );
  }

  private function renderFileDiff( array $change ) {
    $statusIcon  = 'fa-file';
    $statusClass = '';

    if( $change['type'] === 'A' ) {
      $statusIcon  = 'fa-plus-circle';
      $statusClass = 'status-add';
    } elseif( $change['type'] === 'D' ) {
      $statusIcon  = 'fa-minus-circle';
      $statusClass = 'status-del';
    } elseif( $change['type'] === 'M' ) {
      $statusIcon  = 'fa-pencil-alt';
      $statusClass = 'status-mod';
    }

    echo '<div class="diff-file">';
    echo '<div class="diff-header">';
    echo '<span class="diff-status ' . $statusClass . '">' .
         '<i class="fa ' . $statusIcon . '"></i></span>';
    echo '<span class="diff-path">' .
         htmlspecialchars( $change['path'] ) . '</span>';
    echo '</div>';

    if( $change['is_binary'] ) {
      echo '<div class="diff-binary">Binary files differ</div>';
    } else {
      echo '<div class="diff-content">';
      echo '<table><tbody>';

      foreach( $change['hunks'] as $line ) {
        if( isset( $line['t'] ) && $line['t'] === 'gap' ) {
          echo '<tr class="diff-gap"><td colspan="3">';
          echo '<img src="/images/diff-gap.svg" class="diff-gap-icon" />';
          echo '</td></tr>';
        } else {
          $class = 'diff-ctx';
          $char  = ' ';

          if( $line['t'] === '+' ) {
            $class = 'diff-add';
            $char  = '+';
          } elseif( $line['t'] === '-' ) {
            $class = 'diff-del';
            $char  = '-';
          }

          echo '<tr class="' . $class . '">';
          echo '<td class="diff-num" data-num="' . $line['no'] . '"></td>';
          echo '<td class="diff-num" data-num="' . $line['nn'] . '"></td>';
          echo '<td class="diff-code"><span class="diff-marker">' .
               $char . '</span>' . htmlspecialchars( $line['l'] ) . '</td>';
          echo '</tr>';
        }
      }

      echo '</tbody></table>';
      echo '</div>';
    }

    echo '</div>';
  }
}