<?php

class Qs_View_Helper_FormTime extends Zend_View_Helper_FormElement
{
    protected $_params = [
        'format'          => 'g:i A',
        'minutesInterval' => 15,
        'minuteOptions'   => [],
        'required'        => false,
        'emptyOptions'    => false,
        'smartOptions'    => true,
    ];

    protected function _getInfo($name, $value = null, $attribs = null,
                                $options = null, $listsep = null)
    {
        $info = parent::_getInfo($name, $value, $attribs, $options, $listsep);
        foreach ($this->_params as $paramName => $paramValue) {
            if (isset($info['attribs'][$paramName])) {
                $info[$paramName] = $info['attribs'][$paramName];
                unset($info['attribs'][$paramName]);
            } else {
                $info[$paramName] = $paramValue;
            }
        }
        foreach (array_keys($info) as $key) {
            if (isset($info['attribs'][$key])) {
                unset($info['attribs'][$key]);
            }
        }
        return $info;
    }

    protected function _getValuePart($part, $value)
    {
        if (false == ($time = strtotime($value))) {
            return null;
        }
        return date($part, $time);
    }

    public function formTime($name, $value = null, $attribs = null)
    {
        $info = $this->_getInfo($name, $value, $attribs);
        $id = null;;
        $required = false;
        $format = null;
        $minutes = 0;
        $minutesInterval = 15;
        $emptyOptions = false;
        $smartOptions = true;
        $options = [];
        extract($info);
        $content = $this->view->formHidden($name, $value);
        $this->_initScript(['id' => $id, 'format' => $format]);
        $formatChars = str_split($format);
        foreach ($formatChars as $char) {
            switch ($char) {
                case 'H':
                    $hours = 0;
                    while ($hours < 24) {
                        $options[sprintf('%02d', $hours)] = sprintf('%02d', $hours);
                        $hours++;
                    }
                    break;
                case 's':
                    $seconds = 0;
                    while ($seconds < 60) {
                        $options[sprintf('%02d', $minutes)] = sprintf('%02d', $seconds);
                        $seconds++;
                    }
                    break;
                case 'g':
                    $options = array_keys(array_fill(1, 12, ''));
                    $options = array_combine($options, $options);
                    break;
                case 'i':
                    if (empty($minuteOptions)) {
                        $options = [];
                        $minutes = 0;
                        while ($minutes < 60) {
                            $options[sprintf('%02d', $minutes)] = sprintf('%02d', $minutes);
                            $minutes += $minutesInterval;
                        }
                    } else {
                        $options = $minuteOptions;
                    }
                    $_value = $this->_getValuePart($char, $value);
                    if ($_value && !array_key_exists($_value, $options) && $smartOptions) {
                        $options[$_value] = $_value;
                        ksort($options);
                    }
                    break;
                case 'a':
                case 'A':
                    if ($char == 'a') {
                        $options = ['am' => 'am', 'pm' => 'pm'];
                    } else {
                        $options = ['AM' => 'AM', 'PM' => 'PM'];
                    }
                    break;
                default:
                    $content .= $char;
                    continue 2;
            }
            $_value = $this->_getValuePart($char, $value);
            $_attribs = ['class' => 'time_' . $char, 'data-part' => $char, 'data-target' => $id];
            if (!$required || $emptyOptions) {
                $options = ['' => ''] + (array) $options;
            }
            $content .= $this->formSelect($_value, $_attribs, $options);
        }
        return $content;
    }

    protected function formSelect($value, $attribs, $options)
    {
        $value = array_map('strval', (array) $value);
        $xhtml = '<select' . $this->_htmlAttribs($attribs) . ">\n    ";
        $list = [];
        foreach ((array) $options as $opt_value => $opt_label) {
            $list[] = $this->_build($opt_value, $opt_label, $value);
        }
        $xhtml .= implode("\n    ", $list) . "\n</select>";
        return $xhtml;
    }

    protected function _initScript($options)
    {
        /** @var Qs_Doc $doc */
        $doc = Zend_Registry::get('doc');
        $doc->addScript('js/lib/form/element/timeSelect.js');
        $doc->addScript('js/moment.js');
        $doc->addInitObject('lib.form.element.TimeSelect', [$options]);
        return $this;
    }

    protected function _build($value, $label, $selected, $disable = [], $optionClasses = [])
    {
        if (is_bool($disable)) {
            $disable = [];
        }
        $class = null;
        if (array_key_exists($value, $optionClasses)) {
            $class = $optionClasses[$value];
        }
        $opt = '<option value="' . $this->view->escape($value) . '"';
        if ($class) {
            $opt .= ' class="' . $class . '"';
        }
        if (in_array((string) $value, $selected)) {
            $opt .= ' selected="selected"';
        }
        if (in_array($value, $disable)) {
            $opt .= ' disabled="disabled"';
        }
        $opt .= '>' . $this->view->escape(empty($label) ? ' ' : $label) . "</option>";
        return $opt;
    }
}