<?php

class Model_Question extends WebApp_Model
{
    protected $id;
    protected $question;
    protected $choices = array();
    protected $asker;
    protected $asked;
    protected $visible = true;

    public function setId($id) {
        $this->id = (int) $id;
    }

    public function setQuestion($question) {
        $question = trim($question);
        if (empty($question)) {
            throw new InvalidArgument("Question cannot be empty");
        }

        if (strlen($question) > 140) {
            throw new InvalidArgument("Question must be shorter than 140 characters");
        }

        $this->question = htmlentities($question);
    }

    public function setChoices(array $choices) {
        foreach ($choices as $choice) {
            if (!$choice instanceof Model_Choice) {
                throw new InvalidArgument("Choices must be instances of Model_Choice");
            }
        }
    }

    public function addChoice($choice) {
        if (!$choice instanceof Model_Choice) {
            if (is_int($choice)) {
                $choice = Model_Choice::fetch($choice);
                if (!$choice) {
                    throw new InvalidArgument("Supply choice as an instance of Model_Choice, a choice id or a string");
                }
            } else {
                $choice = new Model_Choice(array(
                    "label" => $choice,
                    "post" => $this
                ));
            }
        }

        $this->choices[] = $choice;
    }

    public function setAsker($user) {
        if (!$user instanceof Model_User) {
            $user = Model_User::fetch($user);
            if (!$user) {
                throw new InvalidArgument("Supply asker as an instance of Model_User or a user id");
            }
        }

        $this->asker = $user;
    }

    public function setAsked($when) {
        if (!is_int($when)) {
            $when = strtotime($when);
            if (!$when) {
                throw new InvalidArgument("Supply asked as a timestamp or valid date string accepted by strtotime");
            }
        }

        $this->asked = $when;
    }

    public function getAsked() {
        if ($this->asked == null) {
            $this->asked = time();
        }

        return $this->asked;
    }

    public function setVisible($visible) {
        $this->visible = (bool) $visible;
    }

    public function save() {
        $values = array(
            ":id" => $this->id,
            ":question" => $this->question,
            ":asker" => $this->asker->id,
            ":asked" => date("Y-m-d H:i:s", $this->asked),
            ":visible" => $this->visible
        );

        if ($this->id) {
            $sql = "INSERT INTO question (question, asker, asked, visible) " .
            "VALUES (question, :asker, :asked, :visible)";
            unset($values[":id"]);
        } else {
            $sql = "UPDATE question " .
            "SET question = :question, asker = :asker, asked = :asked, visible = :visible " .
            "WHERE id = :id LIMIT 1";
        }

        // @todo Move to WebApp_Model::save() and call parent::save()
        $stmt = parent::getDb()->prepare($sql);
        $success = $stmt->execute($values);
        $stmt->closeCursor();

        // Check for an error
        // @todo Also move, base 'question' off the class name
        if (!$success) {
            $action = isset($id) ? "update" : "insert";
            throw new DataError("Could not $action the question", parent::getDb()->errorInfo());
        }

        // Set the new id
        $this->id = $id;

        // Save any choices that have been added
        foreach ($this->choices as $choice) {
            $choice->save();
        }

        // @todo Depends on whether askers can be anonymous, change later
        //$this->asker->save();
    }
}