<?php

abstract class DifferentialChangesetRenderer {

  private $user;
  private $changeset;
  private $renderingReference;
  private $renderPropertyChangeHeader;
  private $hunkStartLines;
  private $oldLines;
  private $newLines;
  private $oldComments;
  private $newComments;
  private $oldChangesetID;
  private $newChangesetID;
  private $oldAttachesToNewFile;
  private $newAttachesToNewFile;
  private $highlightOld = array();
  private $highlightNew = array();
  private $codeCoverage;
  private $handles;
  private $markupEngine;
  private $oldRender;
  private $newRender;
  private $originalOld;
  private $originalNew;
  private $gaps;
  private $mask;
  private $depths;
  private $lineCount;

  public function setLineCount($line_count) {
    $this->lineCount = $line_count;
    return $this;
  }
  public function getLineCount() {
    return $this->lineCount;
  }

  public function setDepths($depths) {
    $this->depths = $depths;
    return $this;
  }
  protected function getDepths() {
    return $this->depths;
  }

  public function setMask($mask) {
    $this->mask = $mask;
    return $this;
  }
  protected function getMask() {
    return $this->mask;
  }

  public function setGaps($gaps) {
    $this->gaps = $gaps;
    return $this;
  }
  protected function getGaps() {
    return $this->gaps;
  }

  public function setOriginalNew($original_new) {
    $this->originalNew = $original_new;
    return $this;
  }
  protected function getOriginalNew() {
    return $this->originalNew;
  }

  public function setOriginalOld($original_old) {
    $this->originalOld = $original_old;
    return $this;
  }
  protected function getOriginalOld() {
    return $this->originalOld;
  }

  public function setNewRender($new_render) {
    $this->newRender = $new_render;
    return $this;
  }
  protected function getNewRender() {
    return $this->newRender;
  }

  public function setOldRender($old_render) {
    $this->oldRender = $old_render;
    return $this;
  }
  protected function getOldRender() {
    return $this->oldRender;
  }

  public function setMarkupEngine(PhabricatorMarkupEngine $markup_engine) {
    $this->markupEngine = $markup_engine;
    return $this;
  }
  public function getMarkupEngine() {
    return $this->markupEngine;
  }

  public function setHandles(array $handles) {
    assert_instances_of($handles, 'PhabricatorObjectHandle');
    $this->handles = $handles;
    return $this;
  }
  protected function getHandles() {
    return $this->handles;
  }

  public function setCodeCoverage($code_coverage) {
    $this->codeCoverage = $code_coverage;
    return $this;
  }
  protected function getCodeCoverage() {
    return $this->codeCoverage;
  }

  public function setHighlightNew($highlight_new) {
    $this->highlightNew = $highlight_new;
    return $this;
  }
  protected function getHighlightNew() {
    return $this->highlightNew;
  }

  public function setHighlightOld($highlight_old) {
    $this->highlightOld = $highlight_old;
    return $this;
  }
  protected function getHighlightOld() {
    return $this->highlightOld;
  }

  public function setNewAttachesToNewFile($attaches) {
    $this->newAttachesToNewFile = $attaches;
    return $this;
  }
  protected function getNewAttachesToNewFile() {
    return $this->newAttachesToNewFile;
  }

  public function setOldAttachesToNewFile($attaches) {
    $this->oldAttachesToNewFile = $attaches;
    return $this;
  }
  protected function getOldAttachesToNewFile() {
    return $this->oldAttachesToNewFile;
  }

  public function setNewChangesetID($new_changeset_id) {
    $this->newChangesetID = $new_changeset_id;
    return $this;
  }
  protected function getNewChangesetID() {
    return $this->newChangesetID;
  }

  public function setOldChangesetID($old_changeset_id) {
    $this->oldChangesetID = $old_changeset_id;
    return $this;
  }
  protected function getOldChangesetID() {
    return $this->oldChangesetID;
  }

  public function setNewComments(array $new_comments) {
    foreach ($new_comments as $line_number => $comments) {
      assert_instances_of($comments, 'PhabricatorInlineCommentInterface');
    }
    $this->newComments = $new_comments;
    return $this;
  }
  protected function getNewComments() {
    return $this->newComments;
  }

  public function setOldComments(array $old_comments) {
    foreach ($old_comments as $line_number => $comments) {
      assert_instances_of($comments, 'PhabricatorInlineCommentInterface');
    }
    $this->oldComments = $old_comments;
    return $this;
  }
  protected function getOldComments() {
    return $this->oldComments;
  }

  public function setNewLines(array $new_lines) {
    $this->newLines = $new_lines;
    return $this;
  }
  protected function getNewLines() {
    return $this->newLines;
  }

  public function setOldLines(array $old_lines) {
    $this->oldLines = $old_lines;
    return $this;
  }
  protected function getOldLines() {
    return $this->oldLines;
  }

  public function setHunkStartLines(array $hunk_start_lines) {
    $this->hunkStartLines = $hunk_start_lines;
    return $this;
  }

  protected function getHunkStartLines() {
    return $this->hunkStartLines;
  }

  public function setUser(PhabricatorUser $user) {
    $this->user = $user;
    return $this;
  }
  protected function getUser() {
    return $this->user;
  }

  public function setChangeset(DifferentialChangeset $changeset) {
    $this->changeset = $changeset;
    return $this;
  }
  protected function getChangeset() {
    return $this->changeset;
  }

  public function setRenderingReference($rendering_reference) {
    $this->renderingReference = $rendering_reference;
    return $this;
  }
  protected function getRenderingReference() {
    return $this->renderingReference;
  }

  public function setRenderPropertyChangeHeader($should_render) {
    $this->renderPropertyChangeHeader = $should_render;
    return $this;
  }
  private function shouldRenderPropertyChangeHeader() {
    return $this->renderPropertyChangeHeader;
  }

  abstract public function renderChangesetTable($contents);
  abstract public function renderTextChange(
    $range_start,
    $range_len,
    $rows
  );
  abstract public function renderFileChange(
    $old = null,
    $new = null,
    $id = 0,
    $vs = 0
  );

  /**
   * Render a "shield" over the diff, with a message like "This file is
   * generated and does not need to be reviewed." or "This file was completely
   * deleted." This UI element hides unimportant text so the reviewer doesn't
   * need to scroll past it.
   *
   * The shield includes a link to view the underlying content. This link
   * may force certain rendering modes when the link is clicked:
   *
   *    - `"default"`: Render the diff normally, as though it was not
   *      shielded. This is the default and appropriate if the underlying
   *      diff is a normal change, but was hidden for reasons of not being
   *      important (e.g., generated code).
   *    - `"text"`: Force the text to be shown. This is probably only relevant
   *      when a file is not changed.
   *    - `"whitespace"`: Force the text to be shown, and the diff to be
   *      rendered with all whitespace shown. This is probably only relevant
   *      when a file is changed only by altering whitespace.
   *    - `"none"`: Don't show the link (e.g., text not available).
   *
   * @param   string        Message explaining why the diff is hidden.
   * @param   string|null   Force mode, see above.
   * @return  string        Shield markup.
   */
  public function renderShield($message, $force = 'default') {

    $end = $this->getLineCount();
    $reference = $this->getRenderingReference();

    if ($force !== 'text' &&
        $force !== 'whitespace' &&
        $force !== 'none' &&
        $force !== 'default') {
      throw new Exception("Invalid 'force' parameter '{$force}'!");
    }

    $range = "0-{$end}";
    if ($force == 'text') {
      // If we're forcing text, force the whole file to be rendered.
      $range = "{$range}/0-{$end}";
    }

    $meta = array(
      'ref'   => $reference,
      'range' => $range,
    );

    if ($force == 'whitespace') {
      $meta['whitespace'] = DifferentialChangesetParser::WHITESPACE_SHOW_ALL;
    }

    $more = null;
    if ($force !== 'none') {
      $more = ' '.javelin_render_tag(
        'a',
        array(
          'mustcapture' => true,
          'sigil'       => 'show-more',
          'class'       => 'complete',
          'href'        => '#',
          'meta'        => $meta,
        ),
        'Show File Contents');
    }

    return javelin_render_tag(
      'tr',
      array(
        'sigil' => 'context-target',
      ),
      '<td class="differential-shield" colspan="6">'.
        phutil_escape_html($message).
        $more.
      '</td>');
  }


  protected function renderPropertyChangeHeader($changeset) {
    if (!$this->shouldRenderPropertyChangeHeader()) {
      return null;
    }

    $old = $changeset->getOldProperties();
    $new = $changeset->getNewProperties();

    $keys = array_keys($old + $new);
    sort($keys);

    $rows = array();
    foreach ($keys as $key) {
      $oval = idx($old, $key);
      $nval = idx($new, $key);
      if ($oval !== $nval) {
        if ($oval === null) {
          $oval = '<em>null</em>';
        } else {
          $oval = nl2br(phutil_escape_html($oval));
        }

        if ($nval === null) {
          $nval = '<em>null</em>';
        } else {
          $nval = nl2br(phutil_escape_html($nval));
        }

        $rows[] =
          '<tr>'.
            '<th>'.phutil_escape_html($key).'</th>'.
            '<td class="oval">'.$oval.'</td>'.
            '<td class="nval">'.$nval.'</td>'.
          '</tr>';
      }
    }

    return
      '<table class="differential-property-table">'.
        '<tr class="property-table-header">'.
          '<th>Property Changes</th>'.
          '<td class="oval">Old Value</td>'.
          '<td class="nval">New Value</td>'.
        '</tr>'.
        implode('', $rows).
      '</table>';
  }

  protected function renderChangeTypeHeader($changeset, $force) {
    $change = $changeset->getChangeType();
    $file = $changeset->getFileType();

    $message = null;
    if ($change == DifferentialChangeType::TYPE_CHANGE &&
        $file   == DifferentialChangeType::FILE_TEXT) {
      if ($force) {
        // We have to force something to render because there were no changes
        // of other kinds.
        $message = pht('This file was not modified.');
      } else {
        // Default case of changes to a text file, no metadata.
        return null;
      }
    } else {
      switch ($change) {

        case DifferentialChangeType::TYPE_ADD:
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This file was <strong>added</strong>.');
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This image was <strong>added</strong>.');
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This directory was <strong>added</strong>.');
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This binary file was <strong>added</strong>.');
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This symlink was <strong>added</strong>.');
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This submodule was <strong>added</strong>.');
              break;
          }
          break;

        case DifferentialChangeType::TYPE_DELETE:
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This file was <strong>deleted</strong>.');
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This image was <strong>deleted</strong>.');
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This directory was <strong>deleted</strong>.');
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This binary file was <strong>deleted</strong>.');
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This symlink was <strong>deleted</strong>.');
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This submodule was <strong>deleted</strong>.');
              break;
          }
          break;

        case DifferentialChangeType::TYPE_MOVE_HERE:
          $from =
            "<strong>".
              phutil_escape_html($changeset->getOldFile()).
            "</strong>";
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This file was moved from %s.', $from);
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This image was moved from %s.', $from);
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This directory was moved from %s.', $from);
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This binary file was moved from %s.', $from);
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This symlink was moved from %s.', $from);
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This submodule was moved from %s.', $from);
              break;
          }
          break;

        case DifferentialChangeType::TYPE_COPY_HERE:
          $from =
            "<strong>".
              phutil_escape_html($changeset->getOldFile()).
            "</strong>";
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This file was copied from %s.', $from);
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This image was copied from %s.', $from);
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This directory was copied from %s.', $from);
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This binary file was copied from %s.', $from);
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This symlink was copied from %s.', $from);
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This submodule was copied from %s.', $from);
              break;
          }
          break;

        case DifferentialChangeType::TYPE_MOVE_AWAY:
          $paths =
            "<strong>".
              phutil_escape_html(implode(', ', $changeset->getAwayPaths())).
            "</strong>";
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This file was moved to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This image was moved to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This directory was moved to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This binary file was moved to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This symlink was moved to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This submodule was moved to %s.', $paths);
              break;
          }
          break;

        case DifferentialChangeType::TYPE_COPY_AWAY:
          $paths =
            "<strong>".
              phutil_escape_html(implode(', ', $changeset->getAwayPaths())).
            "</strong>";
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This file was copied to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This image was copied to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This directory was copied to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This binary file was copied to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This symlink was copied to %s.', $paths);
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This submodule was copied to %s.', $paths);
              break;
          }
          break;

        case DifferentialChangeType::TYPE_MULTICOPY:
          $paths =
            "<strong>".
              phutil_escape_html(implode(', ', $changeset->getAwayPaths())).
            "</strong>";
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht(
                'This file was deleted after being copied to %s.',
                $paths);
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht(
                'This image was deleted after being copied to %s.',
                $paths);
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht(
                'This directory was deleted after being copied to %s.',
                $paths);
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht(
                'This binary file was deleted after being copied to %s.',
                $paths);
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht(
                'This symlink was deleted after being copied to %s.',
                $paths);
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht(
                'This submodule was deleted after being copied to %s.',
                $paths);
              break;
          }
          break;

        default:
          switch ($file) {
            case DifferentialChangeType::FILE_TEXT:
              $message = pht('This is a file.');
              break;
            case DifferentialChangeType::FILE_IMAGE:
              $message = pht('This is an image.');
              break;
            case DifferentialChangeType::FILE_DIRECTORY:
              $message = pht('This is a directory.');
              break;
            case DifferentialChangeType::FILE_BINARY:
              $message = pht('This is a binary file.');
              break;
            case DifferentialChangeType::FILE_SYMLINK:
              $message = pht('This is a symlink.');
              break;
            case DifferentialChangeType::FILE_SUBMODULE:
              $message = pht('This is a submodule.');
              break;
          }
          break;
      }
    }

    return
      '<div class="differential-meta-notice">'.
        $message.
      '</div>';
  }

  protected function renderInlineComment(
    PhabricatorInlineCommentInterface $comment,
    $on_right = false) {

    $user = $this->getUser();
    $edit = $user &&
            ($comment->getAuthorPHID() == $user->getPHID()) &&
            ($comment->isDraft());
    $allow_reply = (bool)$user;

    return id(new DifferentialInlineCommentView())
      ->setInlineComment($comment)
      ->setOnRight($on_right)
      ->setHandles($this->getHandles())
      ->setMarkupEngine($this->getMarkupEngine())
      ->setEditable($edit)
      ->setAllowReply($allow_reply)
      ->render();
  }

}