<?php

/* vim: set expandtab tabstop=4 shiftwidth=4: */

/**
 * Contains the Calendar_Validator class.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category  Date and Time
 *
 * @author    Harry Fuecks <hfuecks@phppatterns.com>
 * @copyright 2003-2007 Harry Fuecks
 * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
 *
 * @link      http://pear.php.net/package/Calendar
 */

/**
 * Validation Error Messages.
 */
if (!defined('CALENDAR_VALUE_TOOSMALL')) {
    define('CALENDAR_VALUE_TOOSMALL', 'Too small: min = ');
}
if (!defined('CALENDAR_VALUE_TOOLARGE')) {
    define('CALENDAR_VALUE_TOOLARGE', 'Too large: max = ');
}

/**
 * Used to validate any given Calendar date object. Instances of this class
 * can be obtained from any data object using the getValidator method.
 *
 * @category  Date and Time
 *
 * @author    Harry Fuecks <hfuecks@phppatterns.com>
 * @copyright 2003-2007 Harry Fuecks
 * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
 *
 * @link      http://pear.php.net/package/Calendar
 * @see       Calendar::getValidator()
 */
class Calendar_Validator
{
    /**
     * Instance of the Calendar date object to validate.
     *
     * @var object
     */
    public $calendar;

    /**
     * Instance of the Calendar_Engine.
     *
     * @var object
     */
    public $cE;

    /**
     * Array of errors for validation failures.
     *
     * @var array
     */
    public $errors = [];

    /**
     * Constructs Calendar_Validator.
     *
     * @param object &$calendar subclass of Calendar
     */
    public function __construct(&$calendar)
    {
        $this->calendar = &$calendar;
        $this->cE       = &$calendar->getEngine();
    }

    /**
     * Calls all the other isValidXXX() methods in the validator.
     *
     * @return bool
     */
    public function isValid()
    {
        $checks = [
            'isValidYear',
            'isValidMonth',
            'isValidDay',
            'isValidHour',
            'isValidMinute',
            'isValidSecond',
        ];
        $valid  = true;
        foreach ($checks as $check) {
            if (!$this->{$check}()) {
                $valid = false;
            }
        }

        return $valid;
    }

    /**
     * Check whether this is a valid year.
     *
     * @return bool
     */
    public function isValidYear()
    {
        $y   = $this->calendar->thisYear();
        $min = $this->cE->getMinYears();
        if ($min > $y) {
            $this->errors[] = new Calendar_Validation_Error('Year', $y, CALENDAR_VALUE_TOOSMALL . $min);

            return false;
        }
        $max = $this->cE->getMaxYears();
        if ($y > $max) {
            $this->errors[] = new Calendar_Validation_Error('Year', $y, CALENDAR_VALUE_TOOLARGE . $max);

            return false;
        }

        return true;
    }

    /**
     * Check whether this is a valid month.
     *
     * @return bool
     */
    public function isValidMonth()
    {
        $m   = $this->calendar->thisMonth();
        $min = 1;
        if ($min > $m) {
            $this->errors[] = new Calendar_Validation_Error('Month', $m, CALENDAR_VALUE_TOOSMALL . $min);

            return false;
        }
        $max = $this->cE->getMonthsInYear($this->calendar->thisYear());
        if ($m > $max) {
            $this->errors[] = new Calendar_Validation_Error('Month', $m, CALENDAR_VALUE_TOOLARGE . $max);

            return false;
        }

        return true;
    }

    /**
     * Check whether this is a valid day.
     *
     * @return bool
     */
    public function isValidDay()
    {
        $d   = $this->calendar->thisDay();
        $min = 1;
        if ($min > $d) {
            $this->errors[] = new Calendar_Validation_Error('Day', $d, CALENDAR_VALUE_TOOSMALL . $min);

            return false;
        }
        $max = $this->cE->getDaysInMonth($this->calendar->thisYear(), $this->calendar->thisMonth());
        if ($d > $max) {
            $this->errors[] = new Calendar_Validation_Error('Day', $d, CALENDAR_VALUE_TOOLARGE . $max);

            return false;
        }

        return true;
    }

    /**
     * Check whether this is a valid hour.
     *
     * @return bool
     */
    public function isValidHour()
    {
        $h   = $this->calendar->thisHour();
        $min = 0;
        if ($min > $h) {
            $this->errors[] = new Calendar_Validation_Error('Hour', $h, CALENDAR_VALUE_TOOSMALL . $min);

            return false;
        }
        $max = ($this->cE->getHoursInDay($this->calendar->thisDay()) - 1);
        if ($h > $max) {
            $this->errors[] = new Calendar_Validation_Error('Hour', $h, CALENDAR_VALUE_TOOLARGE . $max);

            return false;
        }

        return true;
    }

    /**
     * Check whether this is a valid minute.
     *
     * @return bool
     */
    public function isValidMinute()
    {
        $i   = $this->calendar->thisMinute();
        $min = 0;
        if ($min > $i) {
            $this->errors[] = new Calendar_Validation_Error('Minute', $i, CALENDAR_VALUE_TOOSMALL . $min);

            return false;
        }
        $max = ($this->cE->getMinutesInHour($this->calendar->thisHour()) - 1);
        if ($i > $max) {
            $this->errors[] = new Calendar_Validation_Error('Minute', $i, CALENDAR_VALUE_TOOLARGE . $max);

            return false;
        }

        return true;
    }

    /**
     * Check whether this is a valid second.
     *
     * @return bool
     */
    public function isValidSecond()
    {
        $s   = $this->calendar->thisSecond();
        $min = 0;
        if ($min > $s) {
            $this->errors[] = new Calendar_Validation_Error('Second', $s, CALENDAR_VALUE_TOOSMALL . $min);

            return false;
        }
        $max = ($this->cE->getSecondsInMinute($this->calendar->thisMinute()) - 1);
        if ($s > $max) {
            $this->errors[] = new Calendar_Validation_Error('Second', $s, CALENDAR_VALUE_TOOLARGE . $max);

            return false;
        }

        return true;
    }

    /**
     * Iterates over any validation errors.
     *
     * @return mixed either Calendar_Validation_Error or false
     */
    public function fetch()
    {
        $error = each($this->errors);
        if ($error) {
            return $error['value'];
        }
        reset($this->errors);

        return false;
    }
}

/**
 * For Validation Error messages.
 *
 * @category  Date and Time
 *
 * @author    Harry Fuecks <hfuecks@phppatterns.com>
 * @copyright 2003-2007 Harry Fuecks
 * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
 *
 * @link      http://pear.php.net/package/Calendar
 * @see       Calendar::fetch()
 */
class Calendar_Validation_Error
{
    /**
     * Date unit (e.g. month,hour,second) which failed test.
     *
     * @var string
     */
    public $unit;

    /**
     * Value of unit which failed test.
     *
     * @var int
     */
    public $value;

    /**
     * Validation error message.
     *
     * @var string
     */
    public $message;

    /**
     * Constructs Calendar_Validation_Error.
     *
     * @param string $unit    Date unit (e.g. month,hour,second)
     * @param int    $value   Value of unit which failed test
     * @param string $message Validation error message
     */
    public function __construct($unit, $value, $message)
    {
        $this->unit    = $unit;
        $this->value   = $value;
        $this->message = $message;
    }

    /**
     * Returns the Date unit.
     *
     * @return string
     */
    public function getUnit()
    {
        return $this->unit;
    }

    /**
     * Returns the value of the unit.
     *
     * @return int
     */
    public function getValue()
    {
        return $this->value;
    }

    /**
     * Returns the validation error message.
     *
     * @return string
     */
    public function getMessage()
    {
        return $this->message;
    }

    /**
     * Returns a string containing the unit, value and error message.
     *
     * @return string
     */
    public function toString()
    {
        return $this->unit . ' = ' . $this->value . ' [' . $this->message . ']';
    }
}
