<?php
// $Id: panels_node.module,v 1.1.2.1 2007-07-07 21:01:02 merlinofchaos Exp $

// ---------------------------------------------------------------------------
// General Drupal hooks

/**
 * Implementation of hook_perm()
 */
function panels_node_perm() {
  return array('create panel-nodes', 'administer panel-nodes');
}

/**
 * Implementation of hook_menu()
 */
function panels_node_menu($may_cache) {
  if ($may_cache) {
    $items[] = array(
      'path' => 'node/add/panel-node',
      'title' => t('Create panel-node'),
      'access' => user_access('create panel-nodes'),
    );
    $items[] = array(
      'path' => 'admin/settings/panel-node',
      'title' => t('Panel-nodes'),
      'access' => user_access('administer panel-nodes'),    
      'callback' => 'panels_node_settings',
    );
  }
  else {
    if (arg(0) == 'node' && is_numeric(arg(1))) {
      $node = node_load(arg(1));
      if ($node && $node->type == 'panel' && node_access($node, 'update')) {
        $base = 'node/' . arg(1) . '/panel_';
        $items[] = array(
          'path' => $base . 'layout',
          'title' => t('Panel layout'),
          'access' => TRUE,    
          'callback' => 'panels_node_edit_layout',
          'callback arguments' => array($node),
          'weight' => 2,
          'type' => MENU_LOCAL_TASK,
        );

        $display = panels_load_display($node->panels_node['did']);
        $layout = panels_get_layout($display->layout);

        if (!empty($layout['settings form'])) {
          $items[] = array(
            'path' => $base . 'settings',
            'title' => t('Panel layout settings'),
            'access' => TRUE,    
            'callback' => 'panels_node_edit_layout_settings',
            'callback arguments' => array($node),
            'weight' => 2,
            'type' => MENU_LOCAL_TASK,
          );
        }
        $items[] = array(
          'path' => $base . 'content',
          'title' => t('Panel content'),
          'access' => TRUE,    
          'callback' => 'panels_node_edit_content',
          'callback arguments' => array($node),
          'weight' => 3,
          'type' => MENU_LOCAL_TASK,
        );
      }
    }
  }
  return $items;
}

// ---------------------------------------------------------------------------
// Node hooks

/**
 * Implementation of hook_node_info
 */
function panels_node_node_info() {
  return array(
    'panel' => array(
      'name' => t('Panel'),
      'module' => 'panels_node',
      'body_label' => t('Teaser'),
      'description' => t("A panel a page layout broken up into rows and columns."),
    )
  );
} 

/**
 * Implementation of hook_access
 */
function panels_node_access($op, $node = NULL) {
  if (user_access('administer panel-nodes')) {
    return TRUE;
  }

  if ($op == 'create' && user_access('create panel-nodes')) {
    return TRUE;
  }

  if ($op == 'update' && $node->uid == $user->uid) {
    return TRUE;
  }
}

/**
 * Implementation of hook_form.
 */
function panels_node_form(&$node, &$param) {
  $form['panels_node']['#tree'] = TRUE;
  if (!$node->nid) {
    // Grab our selected layout from arg(3). If it doesn't exist, present them with
    // a list to pick from.

    $layout = arg(3);
    if (is_null($layout)) {
      $form['markup']['#value'] = '';
      $layouts = panels_get_layouts();
      foreach ($layouts as $id => $layout) {
        $form['markup']['#value'] .= panels_print_layout_link($id, $layout, $_GET['q'] . '/' . $id);
      }
      $form['markup']['#value'] .= '<br style="clear: both;" />';
      return $form;
    }
    else {
      $form['panels_node']['layout'] = array(
        '#type' => 'value',
        '#value' => $layout,
      );
    }
  }

  $type = node_get_types('type', $node); 

  $form['title'] = array(
    '#type'=> 'textfield',
    '#title' => check_plain($type->title_label),
    '#required' => TRUE,
  );

  $form['body'] = array(
    '#type' => 'textarea',
    '#title' => check_plain($type->body_label),
    '#rows' => 10,
    '#required' => TRUE,
    '#description' => t('The teaser is a piece of text to describe when the panel is listed (such as when promoted to front page); the actual content will only be displayed on the full node view.'),
  );

  $css_id = '';
  if (is_object($node->panels_node)) {
    $css_id = $node->panels_node['css_id'];
  }

  $form['panels_node']['css_id'] = array(
    '#type' => 'textfield',
    '#title' => t('CSS ID'),
    '#size' => 30,
    '#description' => t('An ID that can be used by CSS to style the panel.'),
    '#default_value' => $css_id,
  );
  return $form;
}

/**
 * Implementation of hook_validate()
 */
function panels_node_validate($node) {
  if (!$node->nid && empty($node->panels_node['layout'])) {
    form_set_error('', t('Please select a layout.'));
  }
}

/**
 * Implementation of hook_load()
 *
 * Panels does not use revisions for nodes because that would open us up to have completely
 * separate displays, and we'd have to copy them, and that's going to be a LOT of data.
 */
function panels_node_load($node) {
  // We shortcut this because only in some really drastic corruption circumstance will this
  // not work.
  $additions['panels_node'] = db_fetch_array(db_query("SELECT * FROM {panels_node} WHERE nid = %d", $node->nid));
  return $additions;  
}

/**
 * Implementation of hook_insert()
 */
function panels_node_insert(&$node) {
  // Create a new display and record that.
  $display = panels_new_display();
  $display->layout = $node->panels_node['layout'];
  panels_save_display($display);
  $css_id = $node->panels_node['css_id'];
  
  db_query("INSERT INTO {panels_node} (nid, did, css_id) VALUES (%d, %d, '%s')", $node->nid, $display->did, $node->panels_node['css_id']);

  $node->panels_node['did'] = $display->did;
}

/**
 * Implementation of hook_update()
 */
function panels_node_update($node) {
  db_query("UPDATE {panels_node} SET css_id = '%s' WHERE nid = %d", $node->panels_node['css_id'], $node->nid);
}

/**
 * Implementation of hook_view()
 */

function panels_node_view($node, $teaser = FALSE, $page = FALSE) {
  if ($teaser) {
    // Do the standard view for teaser.
    $node = node_prepare($node, $teaser);
  }
  else {
    $display = panels_load_display($node->panels_node['did']);
    $display->css_id = $node->panel_node['css_id'];

    $node->content['body'] = array(
      '#value' => panels_render_display($display),
      '#weight' => 0,
    );
  }

  return $node;
}

// ---------------------------------------------------------------------------
// Administrative pages

/**
 * Settings for panel nodes
 */
function panels_node_settings() {
  require_once drupal_get_path('module', 'panels') . '/panels_common.inc';
  return drupal_get_form('panels_common_settings', 'panels_node');
}

// ---------------------------------------------------------------------------
// Meat of the Panels API; almost completely passing through to panels.module

/**
 * Pass through to the panels layout editor.
 */
function panels_node_edit_layout($node) {
  $display = panels_load_display($node->panels_node['did']);
  return panels_edit_layout($display, t('Save'), "node/$node->nid/panel_layout");
}

/**
 * Pass through to the panels layout settings editor.
 */
function panels_node_edit_layout_settings($node) {
  $display = panels_load_display($node->panels_node['did']);
  return panels_edit_layout_settings($display, t('Save'), "node/$node->nid/panel_settings");
}

/**
 * Pass through to the panels content editor.
 */
function panels_node_edit_content($node) {
  $display = panels_load_display($node->panels_node['did']);
  require_once drupal_get_path('module', 'panels') . '/panels_common.inc';
  $content_types = panels_common_get_allowed_types('panels_node');

  // Print this with theme('page') so that blocks are disabled while editing a display.
  // This is important because negative margins in common block layouts (i.e, Garland)
  // messes up the drag & drop.
  print theme('page', panels_edit($display, "node/$node->nid/panel_content", $content_types), FALSE);
}