<?php
class User {
    public $type = NULL;
	public $id = NULL;
	public $email = NULL;
	public $level = NULL;
	public $username = NULL;
	public $firstname = NULL;
	public $lastname = NULL;
    public $fullname = NULL;

	public function __construct($identifier = NULL) {
		if ($identifier) {
			if (is_numeric($identifier)) {
				$this->id = $identifier;
			} else {
				$this->email = $identifier;
			}
		}
    }

    /**
     * Checks if provided string is a valid email address.
     * Used FILTER_VALIDATE_EMAIL filter for most part.
     * Additional regular expression check is used to make sure
     * that email structure is acceptable.
     * 1 or more characters before @ sign
     * 1 or more characters after @ sign
     * dot after 1 or more characters after @ sign
     * 2 or more characters after last dot
     *
     * @param sting $email Email address
     *
     * @return bool
     */
    public static function isEmailAddressValid($email) {
        return filter_var($email, FILTER_VALIDATE_EMAIL) && preg_match('/^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,})$/', $email);
    }

    /**
     * Check if password is at least 6 characters long.
     *
     * @param string $password A trimmed password string.
     *
     * @return bool
     */ 
    public static function isPasswordValid($password) {
        if (empty($password)) {
            return false;
        }
        if (is_callable('mb_strlen')) {
            $length = mb_strlen($password);
        } else {
            $length = strlen($password);
        }
        if ($length >= 6) {
            return true;
        }
        return false;
    }
    
    public function load($loader = NULL) {
        global $Dippler;
        if (!is_object($loader)) {
            $loader = $Dippler->backoffice->loadUser($this->idXML());
        }
		if ($loader) {
			$this->type = "user";
			$this->id = $loader->id[0][0];
			$this->email = $loader->email[0][0];
			$this->level = $loader->level[0][0];
			$this->username = $loader->username[0][0];
			$this->firstname = $loader->firstname[0][0];
            $this->lastname = $loader->lastname[0][0];
            $this->fullname = $this->firstname ." ". $this->lastname;
        }
    }

    public function changePassword($new_password) {
        global $Dippler;
        $this->new_password = $new_password;
        return $Dippler->backoffice->changePassword($this->dataXML());
    }

    public function changeEmail() {
        global $Dippler;
        return $Dippler->backoffice->changeEmail($this->dataXML());
    }
    
    public function approve() {
        global $Dippler;
        return $Dippler->backoffice->approveUser($this->dataXML());
    }
    
    public function unapprove() {
        global $Dippler;
        return $Dippler->backoffice->unApproveUser($this->dataXML());
    }

    public function changeRole() {
        global $Dippler;
        return $Dippler->backoffice->changeUserRole($this->dataXML());
    }

    /**
     * Permanently removes a user from the system.
     * Administrator privileges are required.
     *
     * @return bool
     */
    public function deleteUser() {
        global $Dippler;
        if ($Dippler->is_admin())  {
            return $Dippler->backoffice->deleteUser($this->dataXML());
        }
        return false;
    }
    
    public function getURL() {
        return WWW_ROOT."profile/view/".$this->id;
	}

    public function getAvatarURL($size=20) {
        $default = WWW_ROOT."views/graphics/user.png";
        return "http://www.gravatar.com/avatar/".md5(strtolower(trim($this->email)))."?d=".urlencode($default)."&s={$size}";
    }

    /**
     * Returns edit URL. Uses cancel action to clear input_values
     * cache from session, just in case something is stuck there.
     *
     * @return string
     */
    public function getEditURL() {
        return WWW_ROOT."actions/cancel.php?href=profile/view/{$this->id}/edit";
    }

    public function getType() {
        return $this->type;
	}

	public function getId() {
		return $this->id;
	}
	
	public function getEmail() {
        return $this->email;    
	}

	public function getLevel() {
		return $this->level;
	}
    
	public function getUsername() {
		return $this->username;
	}

    public function getFirstname() {
        return $this->firstname;    
    }
    
    public function getLastname() {
        return $this->lastname;    
    }
    
    public function getFullname() {
        return $this->fullname; 
	}

    function idXML() {
        $data = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>";
		$data .= "<user>";
		if ($this->id) {
			$data .= "<id>{$this->id}</id>";
		} else {
			$data .= "<email>{$this->email}</email>";
		}
		$data .= "</user>";
		return $data;
    }
    
    function dataXML() {
        $data = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>";
		$data .= "<user>";
	    $data .= "<id>{$this->id}</id>";
        $data .= "<email><![CDATA[{$this->email}]]></email>";
	    $data .= "<level>{$this->level}</level>";
        if (isset($this->new_password) && $this->new_password) {
            $data .= "<new_password><![CDATA[{$this->new_password}]]></new_password>";
        }
		$data .= "</user>";
		return $data;
    }
}
?>