<?
if ($Message = db_string($_POST['message'])) {
	if ($Subject = db_string($_POST['subject'])) {
		// New staff PM conversation
		assert_numbers($_POST, array('level'), 'Invalid recipient');
		$DB->query("
			INSERT INTO staff_pm_conversations
				(Subject, Status, Level, UserID, Date)
			VALUES
				('$Subject', 'Unanswered', $_POST[level], $LoggedUser[ID], '".sqltime()."')"
		);

		// New message
		$ConvID = $DB->inserted_id();
		$DB->query("
			INSERT INTO staff_pm_messages
				(UserID, SentDate, Message, ConvID)
			VALUES
				($LoggedUser[ID], '".sqltime()."', '$Message', $ConvID)"
		);

		header('Location: staffpm.php');

	} elseif ($ConvID = (int)$_POST['convid']) {
		// Check if conversation belongs to user
		$DB->query("
			SELECT UserID, AssignedToUser
			FROM staff_pm_conversations
			WHERE ID = $ConvID");
		list($UserID, $AssignedToUser) = $DB->next_record();

		if ($UserID == $LoggedUser['ID'] || $IsFLS || $UserID == $AssignedToUser) {
			// Response to existing conversation
			$DB->query("
				INSERT INTO staff_pm_messages
					(UserID, SentDate, Message, ConvID)
				VALUES
					(".$LoggedUser['ID'].", '".sqltime()."', '$Message', $ConvID)"
			);

			// Update conversation
			if ($IsFLS) {
				// FLS/Staff
				$DB->query("
					UPDATE staff_pm_conversations
					SET Date = '".sqltime()."',
						Unread = true,
						Status = 'Open'
					WHERE ID = $ConvID");
				$Cache->delete_value("num_staff_pms_$LoggedUser[ID]");
			} else {
				// User
				$DB->query("
					UPDATE staff_pm_conversations
					SET Date = '".sqltime()."',
						Unread = true,
						Status = 'Unanswered'
					WHERE ID = $ConvID");
			}

			// Clear cache for user
			$Cache->delete_value("staff_pm_new_$UserID");
			$Cache->delete_value("staff_pm_new_$LoggedUser[ID]");

			header("Location: staffpm.php?action=viewconv&id=$ConvID");
		} else {
			// User is trying to respond to conversation that does no belong to them
			error(403);
		}
	} else {
		// Message but no subject or conversation ID
		header("Location: staffpm.php?action=viewconv&id=$ConvID");

	}
} elseif ($ConvID = (int)$_POST['convid']) {
	// No message, but conversation ID
	header("Location: staffpm.php?action=viewconv&id=$ConvID");
} else {
	// No message or conversation ID
	header('Location: staffpm.php');
}
?>