<?php

namespace dokuwiki\plugin\config\core\Setting;

/**
 * Class setting_multicheckbox
 */
class SettingMulticheckbox extends SettingString
{
    protected $choices = [];
    protected $combine = [];
    protected $other = 'always';

    /** @inheritdoc */
    public function update($input)
    {
        if ($this->isProtected()) return false;

        // split any combined values + convert from array to comma separated string
        $input = $input ?: [];
        $input = $this->array2str($input);

        $value = $this->local ?? $this->default;
        if ($value == $input) return false;

        if ($this->pattern && !preg_match($this->pattern, $input)) {
            $this->error = true;
            $this->input = $input;
            return false;
        }

        $this->local = $input;
        return true;
    }

    /** @inheritdoc */
    public function html(\admin_plugin_config $plugin, $echo = false)
    {

        $disable = '';

        if ($this->isProtected()) {
            $value = $this->protected;
            $disable = 'disabled="disabled"';
        } elseif ($echo && $this->error) {
            $value = $this->input;
        } else {
            $value = $this->local ?? $this->default;
        }

        $key = htmlspecialchars($this->key);

        // convert from comma separated list into array + combine complimentary actions
        $value = $this->str2array($value);
        $default = $this->str2array($this->default);

        $input = '';
        foreach ($this->choices as $choice) {
            $idx = array_search($choice, $value);
            $idx_default = array_search($choice, $default);

            $checked = ($idx !== false) ? 'checked="checked"' : '';

            // @todo ideally this would be handled using a second class of "default"
            $class = (($idx !== false) === (false !== $idx_default)) ? " selectiondefault" : "";

            $prompt = ($plugin->getLang($this->key . '_' . $choice) ?: htmlspecialchars($choice));

            $input .= '<div class="selection' . $class . '">' . "\n";
            $input .= '<label for="config___' . $key . '_' . $choice . '">' . $prompt . "</label>\n";
            $input .= '<input id="config___' . $key . '_' . $choice . '" name="config[' . $key .
                '][]" type="checkbox" class="checkbox" value="' . $choice . '" ' . $disable . ' ' . $checked . "/>\n";
            $input .= "</div>\n";

            // remove this action from the disabledactions array
            if ($idx !== false) unset($value[$idx]);
            if ($idx_default !== false) unset($default[$idx_default]);
        }

        // handle any remaining values
        if ($this->other != 'never') {
            $other = implode(',', $value);
            // test equivalent to ($this->_other == 'always' || ($other && $this->_other == 'exists')
            // use != 'exists' rather than == 'always' to ensure invalid values default to 'always'
            if ($this->other != 'exists' || $other) {
                $class = (
                    (count($default) === count($value)) &&
                    (count($value) === count(array_intersect($value, $default)))
                ) ?
                    " selectiondefault" : "";

                $input .= '<div class="other' . $class . '">' . "\n";
                $input .= '<label for="config___' . $key . '_other">' .
                    $plugin->getLang($key . '_other') .
                    "</label>\n";
                $input .= '<input id="config___' . $key . '_other" name="config[' . $key .
                    '][other]" type="text" class="edit" value="' . htmlspecialchars($other) .
                    '" ' . $disable . " />\n";
                $input .= "</div>\n";
            }
        }
        $label = '<label>' . $this->prompt($plugin) . '</label>';
        return [$label, $input];
    }

    /**
     * convert comma separated list to an array and combine any complimentary values
     *
     * @param string $str
     * @return array
     */
    protected function str2array($str)
    {
        $array = explode(',', $str);

        if (!empty($this->combine)) {
            foreach ($this->combine as $key => $combinators) {
                $idx = [];
                foreach ($combinators as $val) {
                    if (($idx[] = array_search($val, $array)) === false) break;
                }

                if (count($idx) && $idx[count($idx) - 1] !== false) {
                    foreach ($idx as $i) unset($array[$i]);
                    $array[] = $key;
                }
            }
        }

        return $array;
    }

    /**
     * convert array of values + other back to a comma separated list, incl. splitting any combined values
     *
     * @param array $input
     * @return string
     */
    protected function array2str($input)
    {

        // handle other
        $other = trim($input['other']);
        $other = empty($other) ? [] : explode(',', str_replace(' ', '', $input['other']));
        unset($input['other']);

        $array = array_unique(array_merge($input, $other));

        // deconstruct any combinations
        if (!empty($this->combine)) {
            foreach ($this->combine as $key => $combinators) {
                $idx = array_search($key, $array);
                if ($idx !== false) {
                    unset($array[$idx]);
                    $array = array_merge($array, $combinators);
                }
            }
        }

        return implode(',', array_unique($array));
    }
}
