<?php
/**
 * @file
 * Provides a form for creating & editing chado controlled vocabularies
 */

/**
 * Form for editing cvterms
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_edit_form($form, &$form_state) {

  $step = 0;
  if (empty($form_state['storage']['step'])) {
    $form_state['storage']['step'] = 0;
  }
  else {
    $step = $form_state['storage']['step'];
  }

  $cv_id = 0;
  if ($step == 1) {
    $cv_id = $form_state['storage']['cv_id'];
    $cvterm_name = $form_state['storage']['name'];
    $cvterm_id = $form_state['storage']['cvterm_id'];
  }
  // get the cv if form was submitted via AJAX
  $cvterm = '';
  if (array_key_exists('values', $form_state)) {
    $cv_id = $form_state['values']['cv_id'];
    if (array_key_exists('cvterm', $form_state['values'])) {
      $cvterm = $form_state['values']['cvterm'];
    }
  }
  elseif (isset($form_state['build_info']['args'][0])) {
    $cv_id = $form_state['build_info']['args'][0];
    $cvterm_id = $form_state['build_info']['args'][1];
    if ($form_state['build_info']['args'][1]) {
      $cvterm_name = chado_query('SELECT name FROM {cvterm} WHERE cvterm_id=:id', array(':id' => $cvterm_id))->fetchField();
      $step = 1;
    }
  }

  // get a list of CVs
  $cvs = array();
  $sql = "SELECT * FROM {cv} WHERE NOT name = 'tripal' ORDER BY name ";
  $results = chado_query($sql);
  $cvs[] = 'Select a vocabulary';
  foreach ($results as $cv) {
    $cvs[$cv->cv_id] = $cv->name;
  }
  $form['cv_id'] = array(
    '#title' => t('Controlled Vocabulary (Ontology) Name'),
    '#type' => 'select',
    '#options' => $cvs,
    '#required' => TRUE,
    '#default_value' => $cv_id,
    '#ajax' => array(
       'callback'    => 'tripal_cv_cvterm_edit_form_ajax',
       'wrapper' => 'cvterm-edit-div',
       'event'   => 'change',
       'method'  => 'replace',
       'event'    => 'change',
    ),
  );

  if ($cv_id and $step == 0) {

    $form['name']= array(
      '#type'          => 'textfield',
      '#title'         => t("Term Name"),
      '#default_value' => $cvterm,
      '#required'      => TRUE,
      '#autocomplete_path' => "admin/tripal/tripal_cv/cvterm/auto_name/$cv_id",
      '#description'   => t('Enter the term to edit.')
    );
    $form['continue']= array(
      '#type'          => 'submit',
      '#value'         => 'continue',
    );
  }
  elseif ($step == 1) {

    tripal_cv_add_cvterm_form_fields($form, $form_state, $cv_id, $cvterm_name);

    // when editing there are certain fields the user should not change for a term
    // let's mark those as disabled
    $form['cv_id']['#disabled'] = TRUE;
    $form['fields']['db_id']['#disabled'] = TRUE;
    $form['fields']['accession']['#disabled'] = TRUE;

    // add in the div for replacing the fields if needed
    $form['fields']['#prefix'] = '<div id="cvterm-edit-div">';
    $form['fields']['#suffix'] = '</div>';

    // add in the cvterm id
    $form['fields']['cvterm_id'] = array(
      '#type' => 'hidden',
      '#value' =>  $cvterm_id,
    );

    $form['update'] = array(
      '#type'         => 'submit',
      '#value'        => t('Update'),
    );
    $form['delete'] = array(
      '#type'         => 'submit',
      '#value'        => t('Delete'),
      '#attributes'   => array('onclick' => 'if(!confirm("Really Delete?")){return false;}'),
    );
  }

  if ($step == 0) {
    // if we don't have a cv_id then this is the first time the form has
    // benn loaded and we need to create the div where ajax replacement elements get stored
    $form['div_replace'] = array(
      '#type' => 'item',
      '#prefix' => '<div id="cvterm-edit-div">',
      '#suffix' => '</div>',
    );
  }
  return $form;
}

/**
 * Form for adding cvterms
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_add_form($form, &$form_state) {
  $cv_id = 0;
  if (array_key_exists('values', $form_state)) {
    $cv_id = $form_state['values']['cv_id'];
  }
  elseif (isset($form_state['build_info']['args'][0])) {
    $cv_id = $form_state['build_info']['args'][0];
  }

  // get a list of CVs
  $cvs = array();
  $sql = "SELECT * FROM {cv} WHERE NOT name = 'tripal' ORDER BY name ";
  $results = chado_query($sql);
  $cvs[] = 'Select a vocabulary';
  foreach ($results as $cv) {
    $cvs[$cv->cv_id] = $cv->name;
  }
  $form['cv_id'] = array(
    '#title' => t('Controlled Vocabulary (Ontology) Name'),
    '#type' => 'select',
    '#options' => $cvs,
    '#required' => TRUE,
    '#default_value' => $cv_id,
  );
  tripal_cv_add_cvterm_form_fields($form, $form_state);

  $form['add'] = array(
    '#type'         => 'submit',
    '#value'        => t('Add Term'),
  );

  return $form;
}

/**
 * Form fields in common between add/edit forms
 *
 * @ingroup tripal_cv
 */
function tripal_cv_add_cvterm_form_fields(&$form, $form_state, $cv_id = 0, $cvterm_name = '') {

  $name = '';
  $definition = '';
  $is_relationship = '';
  $is_obsolete = '';
  $db_id = '';
  $accession = '';

  // get default values
  if ($cvterm_name) {
    $values = array('cv_id' => $cv_id, 'name' => $cvterm_name);
    $cvterm = chado_generate_var('cvterm', $values);
    $name = $cvterm->name;
    $definition = $cvterm->definition;
    $is_relationship = $cvterm->is_relationshiptype;
    $is_obsolete = $cvterm->is_obsolete;
    $db_id = $cvterm->dbxref_id->db_id->db_id;
    $accession = $cvterm->dbxref_id->accession;
  }

  // add a fieldset for the Drupal Schema API
  $form['fields'] = array(
    '#type' => 'fieldset',
    '#title' => 'Term Details',
    '#collapsible' => 0,
  );


  $form['fields']['name']= array(
    '#type'          => 'textfield',
    '#title'         => t("Term Name"),
    '#default_value' => $name,
    '#description'   => t('The term must be unique within the database selected below.'),
    '#required'      => TRUE,
  );

  $form['fields']['definition']= array(
    '#type'          => 'textarea',
    '#title'         => t('Description'),
    '#description'   => t('Please enter a description for this term'),
    '#default_value' => $definition,
  );

  $form['fields']['is_relationship'] = array(
    '#type'          => 'checkbox',
    '#title'         => t('This term describes a relationship?'),
    '#default_value' => $is_relationship,
  );

  $form['fields']['is_obsolete'] = array(
    '#type'          => 'checkbox',
    '#title'         => t('This term is obsolete?'),
    '#default_value' => $is_obsolete,
  );

  $values = array();
  $columns = array('db_id', 'name');
  $options = array('order_by' => array('name' => 'ASC'));
  $results = chado_select_record('db', $columns, $values, $options);
  $dbs = array();
  $dbs[] = '';
  foreach ($results as $db) {
    $dbs[$db->db_id] = $db->name;
  }
  $form['fields']['db_id'] = array(
    '#type'         => 'select',
    '#title'         => t('Database'),
    '#description'   => t('All terms must be assocated with a database. If there is no database for this term (e.g. it is a custom term specific to this site) then select the database \'null\' or consider creating a database specific for your site and use that anytime you would like to add terms.'),
    '#options'      => $dbs,
    '#default_value' => $db_id,
    '#required' => TRUE,
  );

  $form['fields']['accession']= array(
    '#type'          => 'textfield',
    '#title'         => t("Accession"),
    '#description'   => t('If this term has an existing accession (unique identifier) in the database
       please enter that here.  If the accession is numeric with a database prefix (e.g. GO:003023), please
       enter just the numeric value.  The database prefix will be appended whenever the term is displayed.
       If you do not have a numeric value consider entering the term name as the accession.'),
    '#required'      => TRUE,
    '#default_value' => $accession,
  );
}

/**
 * Validate cvterm edit form
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_edit_form_validate($form, &$form_state) {
  $cv_id = array_key_exists('cv_id', $form_state['values']) ? $form_state['values']['cv_id'] : '';
  $db_id = array_key_exists('db_id', $form_state['values']) ? $form_state['values']['db_id'] : '';
  $name = array_key_exists('name', $form_state['values']) ? $form_state['values']['name'] : '';
  $cvterm_id = array_key_exists('cvterm_id', $form_state['values']) ? $form_state['values']['cvterm_id'] : '';
  $accession = array_key_exists('accession', $form_state['values']) ? $form_state['values']['accession'] : '';

  $step = $form_state['storage']['step'];

  // make sure the cv term name is unique for this vocabulary
  if ($step == 1) {
    $values = array('name' => $name, 'cv_id' => $cv_id);
    $results = chado_select_record('cvterm', array('cvterm_id'), $values);
    foreach ($results as $r) {
      if ($r->cvterm_id != $cvterm_id) {
        form_set_error('name', 'The term name must be unique for this vocabulary. Another term with this name already exists.');
      }
    }
  }
}

/**
 * Validate cv add form
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_add_form_validate($form, &$form_state) {
  $cv_id = array_key_exists('cv_id', $form_state['values']) ? $form_state['values']['cv_id'] : '';
  $db_id = array_key_exists('db_id', $form_state['values']) ? $form_state['values']['db_id'] : '';
  $name = array_key_exists('name', $form_state['values']) ? $form_state['values']['name'] : '';
  $accession = array_key_exists('accession', $form_state['values']) ? $form_state['values']['accession'] : '';

  $values = array('cv_id' => $cv_id);
  $results = chado_select_record('cv', array('name'), $values);
  if (!$results or count($results) == 0) {
    form_set_error('cv_id', 'The controlled vocabulary does not exist');
  }

  // make sure the DB exists
  $values = array('db_id' => $db_id);
  $results = chado_select_record('db', array('name'), $values);
  if (!$results or count($results) == 0) {
    form_set_error('db_id', 'The database name does not exist');
  }

  // make sure the cv term name is unique for this vocabulary
  $values = array('name' => $name, 'cv_id' => $cv_id);
  $results = chado_select_record('cvterm', array('cvterm_id'), $values);
  if (count($results) > 0) {
    form_set_error('name', 'The term name must be unique for this vocabulary. Another term with this name already exists.');
  }

  // make sure this accession is unique for the database
  $values = array('accession' => $accession, 'db_id' => $db_id);
  $results = chado_select_record('dbxref', array('dbxref_id'), $values);
  if (count($results) > 0 ) {
    form_set_error('accession', 'The accession is not uniuqe for this vocabulary\'s database.');
  }

}

/**
 * Edits existing controlled vocabulary terms
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_edit_form_submit($form, &$form_state) {

  $cv_id           = array_key_exists('cv_id', $form_state['values'])           ? trim($form_state['values']['cv_id']) : '';
  $name            = array_key_exists('name', $form_state['values'])            ? trim($form_state['values']['name']) : '';
  $definition      = array_key_exists('definition', $form_state['values'])      ? trim($form_state['values']['definition']) : '';
  $is_relationship = array_key_exists('is_relationship', $form_state['values']) ? trim($form_state['values']['is_relationship']) : '';
  $is_obsolete     = array_key_exists('is_obsolete', $form_state['values'])     ? trim($form_state['values']['is_obsolete']) : '';
  $cvterm_id       = array_key_exists('cvterm_id', $form_state['values'])       ? trim($form_state['values']['cvterm_id']) : '';
  $db_id           = array_key_exists('db_id', $form_state['values'])           ? trim($form_state['values']['db_id']) : '';
  $accession       = array_key_exists('accession', $form_state['values'])       ? trim($form_state['values']['accession']) : '';
  $op              = array_key_exists('op', $form_state['values'])              ? trim($form_state['values']['op']) : '';


  $step = $form_state['storage']['step'];

  switch ($step) {
    case 0:  // a cvterm name has been selected
      $cv_id = array_key_exists('cv_id', $form_state['values']) ? trim($form_state['values']['cv_id']) : '';
      $name  = array_key_exists('name', $form_state['values'])  ? trim($form_state['values']['name'])  : '';

      // get the original cvterm_id
      $values = array('name' => $name, 'cv_id' => $cv_id);
      $results = chado_select_record('cvterm', array('cvterm_id'), $values);
      $cvterm = $results[0];

      $form_state['storage']['cv_id'] = $cv_id;
      $form_state['storage']['name'] = $name;
      $form_state['storage']['step'] = 1;
      $form_state['storage']['cvterm_id'] = $cvterm->cvterm_id;
      $form_state['rebuild'] = TRUE;
      break;

    case 1:  // update/delete button has been clicked

      if ($op == 'Update') {
        // get the cv
        $values = array('cv_id' => $cv_id);
        $results = chado_select_record('cv', array('name'), $values);
        $cv = $results[0];

        // get the db
        $values = array('db_id' => $db_id);
        $results = chado_select_record('db', array('name'), $values);
        $db = $results[0];

        // now add the term
        $term = array(
          'name' => $name,
          'namespace' => $cv->name,
          'id' => $accession,
          'definition' => $definition,
          'is_obsolete' => $is_obsolete,
          'cv_name' => $cv->name,
          'is_relationship' => $is_relationship,
          'db_name' => $db_name
        );

        $cvterm = tripal_insert_cvterm($term, array('update_existing' => TRUE));
        if ($cvterm) {
          drupal_set_message('Term updated successfully.');
        }
        else {
          drupal_set_message('Could not add term. Check Drupal recent logs for error messages.', 'error');
        }
      }
      if ($op == 'Delete') {
        $values = array('cvterm_id' => $cvterm_id);
        $success = chado_delete_record('cvterm', $values);
        if ($success) {
          drupal_set_message('Term deleted successfully.');
        }
        else {
          drupal_set_message('Could not delete term term. Check Drupal recent logs for error messages.', 'error');
        }
      }
      break;
  }
}

/**
 * Adds new terms to an existing cv
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_add_form_submit($form, &$form_state) {
  $cv_id = array_key_exists('cv_id', $form_state['values']) ? $form_state['values']['cv_id'] : '';
  $name = array_key_exists('name', $form_state['values']) ? $form_state['values']['name'] : '';
  $definition = array_key_exists('definition', $form_state['values']) ? $form_state['values']['definition'] : '';
  $is_relationship = array_key_exists('is_relationship', $form_state['values']) ? $form_state['values']['is_relationship'] : '';
  $is_obsolete = array_key_exists('is_obsolete', $form_state['values']) ? $form_state['values']['is_obsolete'] : '';

  $db_id = array_key_exists('db_id', $form_state['values']) ? $form_state['values']['db_id'] : '';
  $accession = array_key_exists('accession', $form_state['values']) ? $form_state['values']['accession'] : '';

  // get the database
  $values = array('db_id' => $db_id);
  $results = chado_select_record('db', array('name'), $values);
  $db = $results[0];

  // get the cv
  $values = array('cv_id' => $cv_id);
  $results = chado_select_record('cv', array('name'), $values);
  $cv = $results[0];

  // now add the term
  $term = array(
    'name' => $name,
    'namespace' => $cv->name,
    'id' => $accession,
    'definition' => $definition,
    'is_obsolete' => $is_obsolete,
    'cv_name' => $cv->name,
    'is_relationship' => $is_relationship,
    'db_name' => $db->name
  );

  $cvterm = tripal_insert_cvterm($term, array('update_existing' => TRUE));
  if ($cvterm) {
    drupal_set_message('Term added successfully.');
  }
  else {
    drupal_set_message('Could not add term. Check Drupal recent logs for error messages.', 'error');
  }
}

/**
 * Ajax callback for the tripal_cv_form
 *
 * @ingroup tripal_cv
 */
function tripal_cv_cvterm_edit_form_ajax($form, $form_state) {

  $elements = array();

  $elements['name'] = $form['name'];
  $elements['continue'] = $form['continue'];

  // add back in the cv-edit-div that is used for the next round of AJAX
  $elements['name']['#prefix'] =  '<div id="cvterm-edit-div">';
  $elements['name']['#suffix'] =  '</div">';


  return $elements;
}