<?php
/**
 * @author Michael Tänzer
 */

class Default_Model_User {
    protected $db;

    protected $id;
    protected $points = null;

    protected function __construct(Zend_Db_Adapter_Abstract $db, $id) {
        // Not allowed to create new users from within the manager

        $this->db = $db;
        $this->id = $id;
    }

    /**
     * Get an user object for the given ID
     *
     * @param $id int
     * @return Default_Model_User
     */
    public static function findById($id) {
        // Get database connection
        $config = new Zend_Config_Ini(
            APPLICATION_PATH . '/configs/application.ini',
            APPLICATION_ENV);
        $db = Zend_Db::factory($config->ca_mgr->db->auth->pdo,
            $config->ca_mgr->db->auth);

        // Check if the ID is present on the test server
        $query = 'select `id` from `users` where `id` = :user';
        $query_params['user'] = $id;
        $result = $db->query($query, $query_params);
        if ($result->rowCount() !== 1) {
            throw new Exception(
                __METHOD__ . ': user ID not found in the data base');
        }
        $row = $result->fetch();

        return new Default_Model_User($db, $row['id']);
    }

    /**
     * Get an user object for the currently logged in user
     *
     * @return Default_Model_User
     */
    public static function findCurrentUser() {
        $session = Zend_Registry::get('session');
        if ($session->authdata['authed'] !== true) {
            throw new Exception(
                __METHOD__ . ': you need to log in to use this feature');
        }

        return self::findById($session->authdata['authed_id']);
    }

    /**
     * Get the first assurer who didn't already assure the user
     *
     * @return Default_Model_User
     */
    public function findNewAssurer()
    {
        $query = 'select min(`id`) as `assurer` from `users` ' .
            'where `email` like \'john.doe-___@example.com\' and ' .
            '`id` not in (select `from` from `notary` where `to` = :user)';
        $query_params['user'] = $this->id;
        $row = $this->db->query($query, $query_params)->fetch();

        if ($row['assurer'] === NULL) {
            throw new Exception(
                __METHOD__ . ': no more assurers that haven\'t already '.
                'assured this account');
        }

        return new Default_Model_User($this->db, $row['assurer']);
    }

    /**
     * Get the first assuree who hasn't already been assured by this user
     *
     * @return Default_Model_User
     */
    public function findNewAssuree() {
        $query = 'select min(`id`) as `assuree` from `users` ' .
            'where `email` like \'john.doe-___@example.com\' and ' .
            '`id` not in (select `to` from `notary` where `from` = :user)';
        $query_params['user'] = $this->id;
        $row = $this->db->query($query, $query_params)->fetch();

        if ($row['assuree'] === NULL) {
            throw new Exception(
                __METHOD__ . ': no more assurees that haven\'t already '.
                'been assured by this account');
        }

        return new Default_Model_User($this->db, $row['assuree']);
    }

    /**
     * Refresh the current value of points from the test server
     *
     * Needed if operations outside this class are made, that might affect the
     * user's points
     */
    public function refreshPoints() {
        $query = "SELECT SUM(`points`) AS `total` FROM `notary` " .
            "WHERE `to` = :user AND `method` != 'Administrative Increase' AND `from` != `to`";
        $query_params['user'] = $this->id;
        $row = $this->db->query($query, $query_params)->fetch();
        if ($row['total'] === null) $row['total'] = 0;

        $this->points = $row['total'];

        if($this->points < 100) return;

        $this->points = 100;

        $query = "SELECT COUNT(`points`) AS `total` FROM `notary` " .
            "WHERE `from` = :user AND `method` = 'Face to Face Meeting' AND `from` != `to`";
        $query_params['user'] = $this->id;
        $row = $this->db->query($query, $query_params)->fetch();
        if ($row['total'] === null) $row['total'] = 0;

        $this->points += ($row['total'] > 25) ? 50 : $row['total'] * 2;

    }

    /**
     * Get points of the user
     *
     * @return int
     * 		The amount of points the user has
     */
    public function getPoints()
    {
        if ($this->points === null) {
            $this->refreshPoints();
        }

        return $this->points;
    }

    /**
     * Fix the assurer flag for the user
     */
    public function fixAssurerFlag()
    {
        // TODO: unset flag if requirements are not met

        $query = 'UPDATE `users` SET `assurer` = 1 WHERE `users`.`id` = :user AND '.

            'EXISTS(SELECT * FROM `cats_passed` AS `cp`, `cats_variant` AS `cv` '.
            'WHERE `cp`.`variant_id` = `cv`.`id` AND `cv`.`type_id` = 1 AND '.
            '`cp`.`user_id` = :user) AND '.

            '(SELECT SUM(`points`) FROM `notary` WHERE `to` = :user AND '.
            '`expire` < now()) >= 100';
        $query_params['user'] = $this->id;
        $this->db->query($query, $query_params);
    }

    /**
     * @return boolean
     */
    public function getAssurerStatus() {
        $query = 'SELECT 1 FROM `users` WHERE `users`.`id` = :user AND '.
            '`assurer_blocked` = 0 AND '.

            'EXISTS(SELECT * FROM `cats_passed` AS `cp`, `cats_variant` AS `cv` '.
            'WHERE `cp`.`variant_id` = `cv`.`id` AND `cv`.`type_id` = 1 AND '.
            '`cp`.`user_id` = :user) AND '.

            '(SELECT SUM(`points`) FROM `notary` WHERE `to` = :user AND '.
            '`expire` < now()) >= 100';
        $query_params['user'] = $this->id;
        $result = $this->db->query($query, $query_params);
        if ($result->rowCount() === 1) {
            return true;
        }

        return false;
    }

    /**
     * @return Zend_Date
     */
    public function getDob() {
        $query = 'select `dob` from `users` where `id` = :user';
        $query_params['user'] = $this->id;
        $row = $this->db->query($query, $query_params)->fetch();

        return new Zend_Date($row['dob'], Zend_Date::ISO_8601);
    }

    /**
     * @return int
     */
    public function getAge() {
        $now = new Zend_Date();
        $dob = $this->getDob();
        $age = $now->get(Zend_Date::YEAR) - $dob->get(Zend_Date::YEAR);

        // Did we have a happy birthday already this year?
        $dob->setYear($now);
        if ($dob->compare($now) > 0) {
            $age -= 1;
        }

        return $age;
    }

    /**
     * @return string
     */
    public function getPrimEmail() {
        $query = 'select `email` from `users` where `id` = :user';
        $query_params['user'] = $this->id;
        $row = $this->db->query($query, $query_params)->fetch();

        return $row['email'];
    }

    /**
     * Assure another user. Usual restrictions apply
     *
     * @param $assuree Default_Model_User
     * @param $points int
     * @param $location string
     * @param $date string
     * @throws Exception
     *
     * @return int
     * 		The amount of points that have been issued (might be less than
     * 		$points)
     */
    public function assure(Default_Model_User $assuree, $points, $location, $date) {
        // Sanitize inputs
        $points = intval($points);
        $location = stripslashes($location);
        $date = stripslashes($date);

        if (!$this->getAssurerStatus()) {
            throw new Exception(
                __METHOD__ . ': '.$this->id.' needs to be an assurer to do '.
                'assurances');
        }

        if ($this->id === $assuree->id) {
            throw new Exception(
                __METHOD__ . ': '.$this->id.' is not allowed to assure '.
                'himself');
        }

        $query = 'select * from `notary` where `from`= :assurer and '.
            '`to`= :assuree';
        $query_params['assurer'] = $this->id;
        $query_params['assuree'] = $assuree->id;
        $result = $this->db->query($query, $query_params);
        if ($result->rowCount() > 0 && $this->getPoints() < 200) {
            throw new Exception(
                __METHOD__ . ': '.$this->id.' is not allowed to assure '.
                $assuree->id .' more than once');
        }

        // Respect the maximum points
        $max = $this->maxpoints();
        $points = min($points, $max);

        $rounddown = $points;
        if ($max < 100) {
            if ($assuree->getPoints() + $points > 100)
                $rounddown = 100 - $assuree->getPoints();
        } else {
            if ($assuree->getPoints() + $points > $max)
                $rounddown = $max - $assuree->getPoints();
        }
        if ($rounddown < 0) $rounddown = 0;

        $query = 'select * from `notary` where `from` = :assurer and '.
            '`to` = :assuree and `awarded` = :points and '.
            '`location` = :location and `date` = :date';
        $query_params['assurer'] = $this->id;
        $query_params['assuree'] = $assuree->id;
        $query_params['points'] = $points;
        $query_params['location'] = $location;
        $query_params['date'] = $date;
        $result = $this->db->query($query, $query_params);
        if ($result->rowCount() > 0) {
            throw new Exception(
                __METHOD__ . ': '.$this->id.' is not allowed to do the same '.
                'assurance to '.$assuree->id.' more than once');
        }

        // Make sure it is empty
        $assurance = array();
        $assurance['from'] = $this->id;
        $assurance['to'] = $assuree->id;
        $assurance['points'] = $rounddown;
        $assurance['awarded'] = $points;
        $assurance['location'] = $location;
        $assurance['date'] = $date;
        $assurance['when'] = new Zend_Db_Expr('now()');

        $this->db->insert('notary', $assurance);
        $assuree->points += $rounddown;
        $assuree->fixAssurerFlag();
        return $rounddown;
    }

    /**
     * Do an administrative increase
     *
     * @param $points int
     * @param $location string
     * @param $date string
     */
    public function adminIncrease($points, $location, $date) {
        //Sanitize inputs
        $points = intval($points);
        $location = stripslashes($location);
        $date = stripslashes($date);

        $increase = array();
        $increase['from'] = $this->id;
        $increase['to'] = $this->id;
        $increase['points'] = $points;
        $increase['awarded'] = $points;
        $increase['location'] = $location;
        $increase['date'] = $date;
        $increase['method'] = 'Administrative Increase';
        $increase['when'] = new Zend_Db_Expr('now()');

        $this->db->insert('notary', $increase);
        $this->points += $points;

        $this->fixAssurerFlag();
    }

    /**
     * Maximum number of points the user may issue
     *
     * @return int
     */
    public function maxpoints() {
        if (!$this->getAssurerStatus()) return 0;

        if ($this->getAge() < 18) return 10;

        $points = $this->getPoints();
        if ($points >= 300) return 200;
        if ($points >= 200) return 150;
        if ($points >= 150) return 35;
        if ($points >= 140) return 30;
        if ($points >= 130) return 25;
        if ($points >= 120) return 20;
        if ($points >= 110) return 15;
        if ($points >= 100) return 10;

        // Should not get here
        throw new Exception(
            __METHOD__ . ': '.$this->id.' We have reached unreachable code');
    }

    /**
     * Get the challenge types that are available in the database
     *
     * @param $db Zend_Db_Adapter_Abstract
     * 	The database connection to use
     *
     * @return array(int => string)
     */
    public static function getAvailableChallengeTypes(
                Zend_Db_Adapter_Abstract $db) {
        $query = 'select `id`, `type_text` from `cats_type`';
        return $db->fetchPairs($query);
    }

    /**
     * Get the challenge variants for this type that are available in the
     * database
     *
     * @param $db Zend_Db_Adapter_Abstract
     * 	The database connection to use
     * @param $type int
     *  The type of challenge you want to get the variants of
     *
     * @return array(int => string)
     */
    public static function getAvailableChallengeVariants(
                Zend_Db_Adapter_Abstract $db, $type) {
        $query = 'select `id`, `test_text` from `cats_variant`
            where `type_id` = :type';
        $query_params['type'] = $type;
        return $db->fetchPairs($query, $query_params);
    }

    /**
     * Assign the challenge to the user
     *
     * @param $type int
     * 	The type of the challenge, has to be one of the keys returned by
     *  getAvailableChallengeTypes()
     * @param $variant int
     * 	The variant of the challenge, has to be one of the keys returned by
     *  getAvailableChallengeVariants()
     * @param $date Zend_Date
     *  The date the challenge was passed, defaults to current time
     */
    public function assignChallenge($type, $variant, Zend_Date $date = null) {
        $types = self::getAvailableChallengeTypes($this->db);
        if (!isset($types[$type])) {
            throw new Exception(
                __METHOD__ . ': got wrong challenge type '.$type.' when '.
                'assigning challenge to user '.$this->id);
        }

        $variants = self::getAvailableChallengeVariants($this->db, $type);
        if (!isset($variants[$variant])) {
            throw new Exception(
                __METHOD__ . ': got wrong challenge variant '.$variant.' when '.
                'assigning challenge to user '.$this->id);
        }

        $challenge = array();
        $challenge['user_id'] = $this->id;
        $challenge['variant_id'] = $variant;
        if ($date !== null) {
            $challenge['pass_date'] = $date->toString('Y-m-d H:i:s');
            // otherwise default value of the database will be used
        }

        $this->db->insert('cats_passed', $challenge);

        $this->fixAssurerFlag();
    }

    /**
     * Get the flags that are set
     *
     * @return array (string => boolean)
     */
    public function getFlags() {
        $flags = $this->db->select()->from('users', self::flags())
            ->where('`id` = ?', $this->id)->query()->fetch();

        foreach ($flags as $key => $value) {
            if ($value === '0') {
                $flags[$key] = false;
            } else {
                $flags[$key] = true;
            }
        }

        return $flags;
    }

    /**
     * Set the flags - to know which flags exist you might want to call
     * getFlags() first
     *
     * @param $flags array (string => boolean)
     * 	Currently unknown flags are silently ignored
     */
    public function setFlags(array $flags) {
        $newflags = array();

        // filter values
        foreach (self::flags() as $flag) {
            if (isset($flags[$flag])) {
                if ($flags[$flag]) {
                    $newflags[$flag] = 1;
                } else {
                    $newflags[$flag] = 0;
                }
            }
        }

        $where = $this->db->quoteInto('`id` = ?', $this->id, Zend_Db::INT_TYPE);
        $this->db->update('users', $newflags, $where);
    }

    /**
     * The flags from the `users` table that might be set
     */
    private static function flags() {
        return array(
            'verified',
            'listme',
            'codesign',
            '1024bit',
            'admin',
            'orgadmin',
            'ttpadmin',
            'adadmin',
            'board',
            'tverify',
            'locadmin',
            'locked',
            'assurer',
            'assurer_blocked');
    }
}