<?php
// $Id$
/******************************************************************************/
/***************************** EDIT EXAMPLE ***********************************/
/******************************************************************************/
function upload_examples_edit_form($form, &$form_state)
{
	global $user;
	$example_id = arg(3);
	/* get example details */
	/*$example_q = db_query("SELECT * FROM {textbook_companion_example} WHERE id = %d LIMIT 1", $example_id);
	$example_data = db_fetch_object($example_q);*/
	$query      = db_select('textbook_companion_example');
	$query->fields('textbook_companion_example');
	$query->condition('id', $example_id);
	$query->range(0, 1);
	$example_q    = $query->execute();
	$example_data = $example_q->fetchObject();
	if (!$example_q) {
		drupal_set_message(t("Invalid example selected."), 'error');
		drupal_goto('');
		return;
	} //!$example_q
	if ($example_data->approval_status != 0) {
		drupal_set_message(t("You cannot edit an example after it has been approved or dis-approved. Please contact site administrator if you want to edit this example."), 'error');
		drupal_goto('');
		return;
	} //$example_data->approval_status != 0
	/* get examples files */
	$source_file  = "";
	$source_id    = 0;
	$result1_file = "";
	$result1_id   = 0;
	$result2_file = "";
	$result2_id   = 0;
	$xcos1_file   = "";
	$xcos1_id     = 0;
	$xcos2_file   = "";
	$xcos2_id     = 0;
	/*$example_files_q = db_query("SELECT * FROM {textbook_companion_example_files} WHERE example_id = %d", $example_id);*/
	$query        = db_select('textbook_companion_example_files');
	$query->fields('textbook_companion_example_files');
	$query->condition('example_id', $example_id);
	$example_files_q = $query->execute();
	while ($example_files_data = $example_files_q->fetchObject()) {
		if ($example_files_data->filetype == "S") {
			$source_file    = l($example_files_data->filename, 'textbook-companion/download/file/' . $example_files_data->id);
			$source_file_id = $example_files_data->id;
			//var_dump($source_file);die;
		} //$example_files_data->filetype == "S"
	} //$example_files_data = $example_files_q->fetchObject()
	/* get chapter details */
	/*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d", $example_data->chapter_id);
	$chapter_data = db_fetch_object($chapter_q);*/
	$query = db_select('textbook_companion_chapter');
	$query->fields('textbook_companion_chapter');
	$query->condition('id', $example_data->chapter_id);
	$result       = $query->execute();
	$chapter_data = $result->fetchObject();
	if (!$chapter_data) {
		drupal_set_message(t("Invalid chapter selected."), 'error');
		drupal_goto('');
		return;
	} //!$chapter_data
	/* get preference details */
	/*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE id = %d", $chapter_data->preference_id);
	$preference_data = db_fetch_object($preference_q);*/
	$query = db_select('textbook_companion_preference');
	$query->fields('textbook_companion_preference');
	$query->condition('id', $chapter_data->preference_id);
	$result          = $query->execute();
	$preference_data = $result->fetchObject();
	if (!$preference_data) {
		drupal_set_message(t("Invalid book selected."), 'error');
		drupal_goto('');
		return;
	} //!$preference_data
	if ($preference_data->approval_status != 1) {
		drupal_set_message(t("Cannot edit example. Either the book proposal has not been approved or it has been rejected."), 'error');
		drupal_goto('');
		return;
	} //$preference_data->approval_status != 1
	/* get proposal details */
	/*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE id = %d", $preference_data->proposal_id);
	$proposal_data = db_fetch_object($proposal_q);*/
	$query = db_select('textbook_companion_proposal');
	$query->fields('textbook_companion_proposal');
	$query->condition('id', $preference_data->proposal_id);
	$result        = $query->execute();
	$proposal_data = $result->fetchObject();
	if (!$proposal_data) {
		drupal_set_message(t("Invalid proposal selected."), 'error');
		drupal_goto('');
		return;
	} //!$proposal_data
	if ($proposal_data->uid != $user->uid) {
		drupal_set_message(t("You do not have permissions to edit this example."), 'error');
		drupal_goto('');
		return;
	} //$proposal_data->uid != $user->uid
	$user_data                    = user_load($proposal_data->uid);
	$form['#redirect']            = 'textbook-companion/code';
	$form['#attributes']          = array(
		'enctype' => "multipart/form-data"
	);
	$form['book_details']['book'] = array(
		'#type' => 'item',
		'#markup' => $preference_data->book,
		'#title' => t('Title of the Book')
	);
	$form['contributor_name']     = array(
		'#type' => 'item',
		'#markup' => $proposal_data->full_name,
		'#title' => t('Contributor Name')
	);
	$form['number']               = array(
		'#type' => 'item',
		'#title' => t('Chapter No'),
		'#markup' => $chapter_data->number
	);
	$form['name']                 = array(
		'#type' => 'item',
		'#title' => t('Title of the Chapter'),
		'#markup' => $chapter_data->name
	);
	$form['example_number']       = array(
		'#type' => 'item',
		'#title' => t('Example No'),
		'#markup' => $example_data->number
	);
	$form['example_caption']      = array(
		'#type' => 'textfield',
		'#title' => t('Caption'),
		'#size' => 40,
		'#maxlength' => 255,
		'#required' => TRUE,
		'#default_value' => $example_data->caption
	);
	$form['example_warning']      = array(
		'#type' => 'item',
		'#title' => t('You should upload all the files (main or source files, result files, executable file if any)'),
		'#prefix' => '<div style="color:red">',
		'#suffix' => '</div>'
	);
	$form['sourcefile']           = array(
		'#type' => 'fieldset',
		'#title' => t('Main or Source Files'),
		'#collapsible' => FALSE,
		'#collapsed' => FALSE
	);
	if ($source_file) {
		$form['sourcefile']['cur_source']          = array(
			'#type' => 'item',
			'#title' => t('Existing Main or Source File'),
			'#markup' => $source_file
		);
		$form['sourcefile']['cur_source_checkbox'] = array(
			'#type' => 'checkbox',
			'#title' => t('Delete Existing Main or Source File'),
			'#description' => 'Check to delete the existing Main or Source file.'
		);
		$form['sourcefile']['sourcefile1']         = array(
			'#type' => 'file',
			'#title' => t('Upload New Main or Source File'),
			'#size' => 48,
			'#description' => t("Upload new Main or Source file above if you want to replace the existing file. Leave blank if you want to keep using the existing file. <br />") . t('Allowed file extensions : ') . variable_get('textbook_companion_source_extensions', '')
		);
		$form['sourcefile']['cur_source_file_id']  = array(
			'#type' => 'hidden',
			'#value' => $source_file_id
		);
	} //$source_file
	else {
		$form['sourcefile']['sourcefile1'] = array(
			'#type' => 'file',
			'#title' => t('Upload New Main or Source File'),
			'#size' => 48,
			'#description' => t('Allowed file extensions : ') . variable_get('textbook_companion_source_extensions', '')
		);
	}
	$form['submit'] = array(
		'#type' => 'submit',
		'#value' => t('Submit')
	);
	$form['cancel'] = array(
		'#type' => 'item',
		'#markup' => l(t('Cancel'), 'textbook-companion/code')
	);
	return $form;
}
function upload_examples_edit_form_validate($form, &$form_state)
{
	if (!check_name($form_state['values']['example_caption']))
		form_set_error('example_caption', t('Example Caption can contain only alphabets, numbers and spaces.'));
	if (isset($_FILES['files'])) {
		/* check for valid filename extensions */
		foreach ($_FILES['files']['name'] as $file_form_name => $file_name) {
			if ($file_name) {
				/* checking file type */
				if (strstr($file_form_name, 'source'))
					$file_type = 'S';
				else if (strstr($file_form_name, 'result'))
					$file_type = 'R';
				else if (strstr($file_form_name, 'xcos'))
					$file_type = 'X';
				else
					$file_type = 'U';
				$allowed_extensions_str = '';
				switch ($file_type) {
					case 'S':
						$allowed_extensions_str = variable_get('textbook_companion_source_extensions', '');
						break;
					case 'R':
						$allowed_extensions_str = variable_get('textbook_companion_result_extensions', '');
						break;
					case 'X':
						$allowed_extensions_str = variable_get('textbook_companion_xcos_extensions', '');
						break;
				} //$file_type
				$allowed_extensions = explode(',', $allowed_extensions_str);
				$temp_ext           = explode('.', strtolower($_FILES['files']['name'][$file_form_name]));
				$temp_extension     = end($temp_ext);
				if (!in_array($temp_extension, $allowed_extensions))
					form_set_error($file_form_name, t('Only file with ' . $allowed_extensions_str . ' extensions can be uploaded.'));
				if ($_FILES['files']['size'][$file_form_name] <= 0)
					form_set_error($file_form_name, t('File size cannot be zero.'));
				/* check if valid file name */
				if (!textbook_companion_check_valid_filename($_FILES['files']['name'][$file_form_name]))
					form_set_error($file_form_name, t('Invalid file name specified. Only alphabets, numbers and underscore is allowed as a valid filename.'));
			} //$file_name
		} //$_FILES['files']['name'] as $file_form_name => $file_name
	} //isset($_FILES['files'])
	/* add javascript again for automatic book title, check if example uploaded, dependency selection effects */
	/*$chapter_name_js = " $(document).ready(function() {
	$('#edit-number').change(function() {
	$.get('" . base_path() . "textbook-companion/ajax/chapter-title/' + $('#edit-number').val() + '/' + " . $row->pre_id . ", function(data) {
	$('#edit-name').val(data);
	});
	});
	$('#edit-example-number').change(function() {
	$.get('" . base_path() . "textbook-companion/ajax/example-exists/' + $('#edit-number').val() + '/' + $('#edit-example-number').val(), function(data) {
	if (data) {
	alert(data);
	}
	});
	});
	$('#edit-existing-depfile-dep-book-title').change(function() {
	
	var dep_selected = ''; 
	/* showing and hiding relevant files */
	/*$('.form-checkboxes .option').hide();
	$('.form-checkboxes .option').each(function(index) {
	var activeClass = $('#edit-existing-depfile-dep-book-title').val();
	if ($(this).children().hasClass(activeClass)) {
	$(this).show();
	}
	if ($(this).children().attr('checked') == true) {
	dep_selected += $(this).children().next().text() + '<br />';
	}
	});
	/* showing list of already existing dependencies */
	/* $('#existing_depfile_selected').html(dep_selected);
	
	});
	
	$('.form-checkboxes .option').change(function() {
	$('#edit-existing-depfile-dep-book-title').trigger('change');
	});
	$('#edit-existing-depfile-dep-book-title').trigger('change');
	});";
	drupal_add_js($chapter_name_js, 'inline', 'header');*/
}
function upload_examples_edit_form_submit($form, &$form_state)
{
	global $user;
	$example_id = arg(3);
	/* get example details */
	/*$example_q = db_query("SELECT * FROM {textbook_companion_example} WHERE id = %d LIMIT 1", $example_id);
	$example_data = db_fetch_object($example_q);*/
	$query      = db_select('textbook_companion_example');
	$query->fields('textbook_companion_example');
	$query->condition('id', $example_id);
	$query->range(0, 1);
	$example_q    = $query->execute();
	$example_data = $example_q->fetchObject();
	if (!$example_q) {
		drupal_set_message(t("Invalid example selected."), 'error');
		drupal_goto('');
		return;
	} //!$example_q
	if ($example_data->approval_status != 0) {
		drupal_set_message(t("You cannot edit an example after it has been approved or dis-approved. Please contact site administrator if you want to edit this example."), 'error');
		drupal_goto('');
		return;
	} //$example_data->approval_status != 0
	/* get chapter details */
	/*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d", $example_data->chapter_id);
	$chapter_data = db_fetch_object($chapter_q);*/
	$query = db_select('textbook_companion_chapter');
	$query->fields('textbook_companion_chapter');
	$query->condition('id', $example_data->chapter_id);
	$result       = $query->execute();
	$chapter_data = $result->fetchObject();
	if (!$chapter_data) {
		drupal_set_message(t("Invalid chapter selected."), 'error');
		drupal_goto('');
		return;
	} //!$chapter_data
	/* get preference details */
	/*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE id = %d", $chapter_data->preference_id);
	$preference_data = db_fetch_object($preference_q);*/
	$query = db_select('textbook_companion_preference');
	$query->fields('textbook_companion_preference');
	$query->condition('id', $chapter_data->preference_id);
	$result          = $query->execute();
	$preference_data = $result->fetchObject();
	if (!$preference_data) {
		drupal_set_message(t("Invalid book selected."), 'error');
		drupal_goto('');
		return;
	} //!$preference_data
	if ($preference_data->approval_status != 1) {
		drupal_set_message(t("Cannot edit example. Either the book proposal has not been approved or it has been rejected."), 'error');
		drupal_goto('');
		return;
	} //$preference_data->approval_status != 1
	/* get proposal details */
	/*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE id = %d", $preference_data->proposal_id);
	$proposal_data = db_fetch_object($proposal_q);*/
	$query = db_select('textbook_companion_proposal');
	$query->fields('textbook_companion_proposal');
	$query->condition('id', $preference_data->proposal_id);
	$result        = $query->execute();
	$proposal_data = $result->fetchObject();
	if (!$proposal_data) {
		drupal_set_message(t("Invalid proposal selected."), 'error');
		drupal_goto('');
		return;
	} //!$proposal_data
	if ($proposal_data->uid != $user->uid) {
		drupal_set_message(t("You do not have permissions to edit this example."), 'error');
		drupal_goto('');
		return;
	} //$proposal_data->uid != $user->uid
	/* creating directories */
	$root_path = textbook_companion_path();
	$dest_path = $preference_data->directory_name . '/';
	if (!is_dir($root_path . $dest_path))
		mkdir($root_path . $dest_path);
	$dest_path .= 'CH' . $chapter_data->number . '/';
	if (!is_dir($root_path . $dest_path))
		mkdir($root_path . $dest_path);
	$dest_path .= 'EX' . $example_data->number . '/';
	if (!is_dir($root_path . $dest_path))
		mkdir($root_path . $dest_path);
	$filepath = 'CH' . $chapter_data->number . '/' . 'EX' . $example_data->number . '/';
	/* updating example caption */
	/*db_query("UPDATE {textbook_companion_example} SET caption = '%s' WHERE id = %d", $form_state['values']['example_caption'], $example_id);*/
	$query    = db_update('textbook_companion_example');
	$query->fields(array(
		'caption' => $form_state['values']['example_caption']
	));
	$query->condition('id', $example_id);
	$num_updated = $query->execute();
	/* handle source file */
	if (isset($form_state['values']['cur_source_file_id'])) {
		$cur_file_id = $form_state['values']['cur_source_file_id'];
	} //isset($form_state['values']['cur_source_file_id'])
	else {
		$cur_file_id = isset($form_state['values']['cur_source_file_id']);
	}
	//var_dump($cur_file_id);die;
	if ($cur_file_id > 0) {
		/*$file_q = db_query("SELECT * FROM  {textbook_companion_example_files} WHERE id = %d AND example_id = %d", $cur_file_id, $example_data->id);
		$file_data = db_fetch_object($file_q);*/
		//var_dump($cur_file_id. $example_data->id);die;
		$query = db_select('textbook_companion_example_files');
		$query->fields('textbook_companion_example_files');
		$query->condition('id', $cur_file_id);
		$query->condition('example_id', $example_data->id);
		$result    = $query->execute();
		$file_data = $result->fetchObject();
		if (!$file_data) {
			drupal_set_message("Error deleting example source file. File not present in database.", 'error');
			return;
		} //!$file_data
		if (($form_state['values']['cur_source_checkbox'] == 1) && (!$_FILES['files']['name']['sourcefile1'])) {
			if (!delete_file($cur_file_id)) {
				drupal_set_message("Error deleting example source file.", 'error');
				return;
			} //!delete_file($cur_file_id)
		} //($form_state['values']['cur_source_checkbox'] == 1) && (!$_FILES['files']['name']['sourcefile1'])
	} //$cur_file_id > 0
	if ($_FILES['files']['name']['sourcefile1']) {
		if ($cur_file_id > 0) {
			if (!delete_file($cur_file_id)) {
				drupal_set_message("Error removing previous example source file.", 'error');
				return;
			} //!delete_file($cur_file_id)
		} //$cur_file_id > 0
		if (file_exists($root_path . $dest_path . $_FILES['files']['name']['sourcefile1'])) {
			drupal_set_message(t("Error uploading source file. File !filename already exists.", array(
				'!filename' => $_FILES['files']['name']['sourcefile1']
			)), 'error');
			return;
		} //file_exists($root_path . $dest_path . $_FILES['files']['name']['sourcefile1'])
		/* uploading file */
		if (move_uploaded_file($_FILES['files']['tmp_name']['sourcefile1'], $root_path . $dest_path . $_FILES['files']['name']['sourcefile1'])) {
			/* for uploaded files making an entry in the database */
			/*db_query("INSERT INTO {textbook_companion_example_files} (example_id, filename, filepath, filemime, filesize, filetype, timestamp)
			VALUES (%d, '%s', '%s', '%s', %d, '%s', %d)",
			$example_data->id,
			$_FILES['files']['name']['sourcefile1'],
			$dest_path . $_FILES['files']['name']['sourcefile1'],
			$_FILES['files']['type']['sourcefile1'],
			$_FILES['files']['size']['sourcefile1'],
			'S',
			time()
			);*/
			$query  = "INSERT INTO {textbook_companion_example_files} (example_id, filename, filepath, filemime, filesize, filetype, 		timestamp) VALUES (:example_id, :filename, :filepath, :filemime, :filesize, :filetype,:timestamp)";
			$args   = array(
				":example_id" => $example_data->id,
				":filename" => $_FILES['files']['name']['sourcefile1'],
				":filepath" => $filepath . $_FILES['files']['name']['sourcefile1'],
				":filemime" => 'application/dwxml',
				":filesize" => $_FILES['files']['size']['sourcefile1'],
				":filetype" => 'S',
				":timestamp" => time()
			);
			$result = db_query($query, $args, array(
				'return' => Database::RETURN_INSERT_ID
			));
			drupal_set_message($_FILES['files']['name']['sourcefile1'] . ' uploaded successfully.', 'status');
		} //move_uploaded_file($_FILES['files']['tmp_name']['sourcefile1'], $root_path . $dest_path . $_FILES['files']['name']['sourcefile1'])
		else {
			drupal_set_message('Error uploading file : ' . $dest_path . '/' . $_FILES['files']['name']['sourcefile1'], 'error');
		}
	} //$_FILES['files']['name']['sourcefile1']
	/* sending email */
	$email_to                               = $user->mail;
	$from                                   = variable_get('textbook_companion_from_email', '');
	$bcc                                    = variable_get('textbook_companion_emails', '');
	$cc                                     = variable_get('textbook_companion_cc_emails', '');
	$params['example_updated']['example_id'] = $example_id;
	$params['example_updated']['user_id']    = $user->uid;
	$params['example_updated']['headers']    = array(
		'From' => $from,
		'MIME-Version' => '1.0',
		'Content-Type' => 'text/plain; charset=UTF-8; format=flowed; delsp=yes',
		'Content-Transfer-Encoding' => '8Bit',
		'X-Mailer' => 'Drupal',
		'Cc' => $cc,
		'Bcc' => $bcc
	);
	if (!drupal_mail('textbook_companion', 'example_updated', $email_to, language_default(), $params, $from, TRUE))
		drupal_set_message('Error sending email message.', 'error');
	drupal_set_message(t("Example successfully udpated."), 'status');
}
/******************************************************************************/
/**************************** EDIT CHAPTER TITLE ******************************/
/******************************************************************************/
function edit_chapter_title_form($form, &$form_state)
{
	global $user;
	/************************ start approve book details ************************/
	/*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE uid = %d ORDER BY id DESC LIMIT 1", $user->uid);
	$proposal_data = db_fetch_object($proposal_q);*/
	$query = db_select('textbook_companion_proposal');
	$query->fields('textbook_companion_proposal');
	$query->condition('uid', $user->uid);
	$query->orderBy('id', 'DESC');
	$query->range(0, 1);
	$result        = $query->execute();
	$proposal_data = $result->fetchObject();
	if (!$proposal_data) {
		drupal_set_message("Please submit a " . l('proposal', 'textbook-companion/proposal') . ".", 'error');
		drupal_goto('textbook-companion/code');
	} //!$proposal_data
	if ($proposal_data->proposal_status != 1 && $proposal_data->proposal_status != 4) {
		switch ($proposal_data->proposal_status) {
			case 0:
				drupal_set_message(t('We have already received your proposal. We will get back to you soon.'), 'status');
				drupal_goto('textbook-companion/code');
				return;
				break;
			case 2:
				drupal_set_message(t('Your proposal has been dis-approved. Please create another proposal ' . l('here', 'proposal') . '.'), 'error');
				drupal_goto('textbook-companion/code');
				return;
				break;
			case 3:
				drupal_set_message(t('Congratulations! You have completed your last book proposal. You have to create another proposal ' . l('here', 'textbook-companion/proposal') . '.'), 'status');
				drupal_goto('textbook-companion/code');
				return;
				break;
			default:
				drupal_set_message(t('Invalid proposal state. Please contact site administrator for further information.'), 'error');
				drupal_goto('textbook-companion/code');
				return;
				break;
		} //$proposal_data->proposal_status
	} //$proposal_data->proposal_status != 1 && $proposal_data->proposal_status != 4
	/*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE proposal_id = %d AND approval_status = 1 LIMIT 1", $proposal_data->id);
	$preference_data = db_fetch_object($preference_q);*/
	$query = db_select('textbook_companion_preference');
	$query->fields('textbook_companion_preference');
	$query->condition('proposal_id', $proposal_data->id);
	$query->condition('approval_status', 1);
	$query->range(0, 1);
	$result          = $query->execute();
	$preference_data = $result->fetchObject();
	if (!$preference_data) {
		drupal_set_message(t('Invalid Book Preference status. Please contact site administrator for further information.'), 'error');
		drupal_goto('textbook-companion/code');
		return;
	} //!$preference_data
	/************************ end approve book details **************************/
	$chapter_id = arg(4);
	/*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d AND preference_id = %d", $chapter_id, $preference_data->id);
	$chapter_data = db_fetch_object($chapter_q);*/
	$query      = db_select('textbook_companion_chapter');
	$query->fields('textbook_companion_chapter');
	$query->condition('id', $chapter_id);
	$query->condition('preference_id', $preference_data->id);
	$result       = $query->execute();
	$chapter_data = $result->fetchObject();
	if (!$chapter_data) {
		drupal_set_message(t('Invalid chapter.'), 'error');
		drupal_goto('textbook-companion/code');
		return;
	} //!$chapter_data
	$form['#redirect']            = 'textbook-companion/code';
	$form['book_details']['book'] = array(
		'#type' => 'item',
		'#markup' => $preference_data->book,
		'#title' => t('Title of the Book')
	);
	$form['contributor_name']     = array(
		'#type' => 'item',
		'#markup' => $proposal_data->full_name,
		'#title' => t('Contributor Name')
	);
	$form['number']               = array(
		'#type' => 'item',
		'#title' => t('Chapter No'),
		'#markup' => $chapter_data->number
	);
	$form['chapter_title']        = array(
		'#type' => 'textfield',
		'#title' => t('Title of the Chapter'),
		'#size' => 40,
		'#maxlength' => 255,
		'#required' => TRUE,
		'#default_value' => $chapter_data->name
	);
	$form['submit']               = array(
		'#type' => 'submit',
		'#value' => t('Submit')
	);
	$form['cancel']               = array(
		'#type' => 'markup',
		'#value' => l(t('Cancel'), 'textbook_companion/code')
	);
	return $form;
}
function edit_chapter_title_form_validate($form, &$form_state)
{
	if (!check_name($form_state['values']['chapter_title']))
		form_set_error('chapter_title', t('Title of the Chapter can contain only alphabets, numbers and spaces.'));
}
function edit_chapter_title_form_submit($form, &$form_state)
{
	global $user;
	/************************ start approve book details ************************/
	/*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE uid = %d ORDER BY id DESC LIMIT 1", $user->uid);
	$proposal_data = db_fetch_object($proposal_q);*/
	$query = db_select('textbook_companion_proposal');
	$query->fields('textbook_companion_proposal');
	$query->condition('uid', $user->uid);
	$query->orderBy('id', 'DESC');
	$query->range(0, 1);
	$result        = $query->execute();
	$proposal_data = $result->fetchObject();
	if (!$proposal_data) {
		drupal_set_message("Please submit a " . l('proposal', 'textbook-companion/proposal') . ".", 'error');
		drupal_goto('textbook-companion/code');
	} //!$proposal_data
	if ($proposal_data->proposal_status != 1 && $proposal_data->proposal_status != 4) {
		switch ($proposal_data->proposal_status) {
			case 0:
				drupal_set_message(t('We have already received your proposal. We will get back to you soon.'), 'status');
				drupal_goto('textbook-companion/code');
				return;
				break;
			case 2:
				drupal_set_message(t('Your proposal has been dis-approved. Please create another proposal ' . l('here', 'proposal') . '.'), 'error');
				drupal_goto('textbook-companion/code');
				return;
				break;
			case 3:
				drupal_set_message(t('Congratulations! You have completed your last book proposal. You have to create another proposal ' . l('here', 'textbook-companion/proposal') . '.'), 'status');
				drupal_goto('textbook-companion/code');
				return;
				break;
			default:
				drupal_set_message(t('Invalid proposal state. Please contact site administrator for further information.'), 'error');
				drupal_goto('textbook-companion/code');
				return;
				break;
		} //$proposal_data->proposal_status
	} //$proposal_data->proposal_status != 1 && $proposal_data->proposal_status != 4
	/*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE proposal_id = %d AND approval_status = 1 LIMIT 1", $proposal_data->id);
	$preference_data = db_fetch_object($preference_q);*/
	$query = db_select('textbook_companion_preference');
	$query->fields('textbook_companion_preference');
	$query->condition('proposal_id', $proposal_data->id);
	$query->condition('approval_status', 1);
	$query->range(0, 1);
	$result          = $query->execute();
	$preference_data = $result->fetchObject();
	if (!$preference_data) {
		drupal_set_message(t('Invalid Book Preference status. Please contact site administrator for further information.'), 'error');
		drupal_goto('textbook-companion/code');
		return;
	} //!$preference_data
	/************************ end approve book details **************************/
	$chapter_id = arg(4);
	/*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d AND preference_id = %d", $chapter_id, $preference_data->id);
	$chapter_data = db_fetch_object($chapter_q);*/
	$query      = db_select('textbook_companion_chapter');
	$query->fields('textbook_companion_chapter');
	$query->condition('id', $chapter_id);
	$query->condition('preference_id', $preference_data->id);
	$result       = $query->execute();
	$chapter_data = $result->fetchObject();
	if (!$chapter_data) {
		drupal_set_message(t('Invalid chapter.'), 'error');
		drupal_goto('textbookcompanion/code');
		return;
	} //!$chapter_data
	/*db_query("UPDATE {textbook_companion_chapter} SET name = '%s' WHERE id = %d", $form_state['values']['chapter_title'], $chapter_id);*/
	$query = db_update('textbook_companion_chapter');
	$query->fields(array(
		'name' => $form_state['values']['chapter_title']
	));
	$query->condition('id', $chapter_id);
	$num_updated = $query->execute();
	drupal_set_message(t('Title of the Chapter updated.'), 'status');
}
/******************************************************************************/
/************************** GENERAL FUNCTIONS *********************************/
/******************************************************************************/
function _list_of_book_titles()
{
	$book_titles = array(
		'0' => 'Please select...'
	);
	/*$book_titles_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE approval_status = 1 OR approval_status = 3 ORDER BY book ASC");*/
	$query       = db_select('textbook_companion_preference');
	$query->fields('textbook_companion_preference');
	$or = db_or();
	$or->condition('approval_status', 1);
	$or->condition('approval_status', 3);
	$query->condition($or);
	$query->orderBy('book', 'ASC');
	$book_titles_q = $query->execute();
	while ($book_titles_data = $book_titles_q->fetchObject()) {
		$book_titles[$book_titles_data->id] = $book_titles_data->book . ' (Written by ' . $book_titles_data->author . ')';
	} //$book_titles_data = $book_titles_q->fetchObject()
	return $book_titles;
}