<?php

//--------------------------------------------------------------------

if (! function_exists('form_open'))
{
    /**
     * Form Declaration
     *
     * Creates the opening portion of the form.
     *
     * @param    string    the URI segments of the form destination
     * @param    array     a key/value pair of attributes
     * @param    array     a key/value pair hidden data
     *
     * @return    string
     */
    function form_open(string $action = '', array $attributes = [], array $hidden = []): string
    {
        // If no action is provided then set to the current url
        if (! $action)
        {
            helper('url');
            $action = current_url(true);
        } // If an action is not a full URL then turn it into one
        elseif (strpos($action, '://') === false)
        {
            $action = site_url($action);
        }

        $attributes = stringify_attributes($attributes);

        if (stripos($attributes, 'method=') === false)
        {
            $attributes .= ' method="post"';
        }
        if (stripos($attributes, 'accept-charset=') === false)
        {
            $config = new \Config\App();
            $attributes .= ' accept-charset="'.strtolower($config->charset).'"';
        }

        $form = '<form action="'.$action.'"'.$attributes.">\n";

        // Add CSRF field if enabled, but leave it out for GET requests and requests to external websites
        $before  = (new \Config\Filters())->globals['before'];

        if ((in_array('csrf', $before) || array_key_exists('csrf', $before))
            && strpos($action, base_url()) !== false
            && ! stripos($form, 'method="get"')
        )
        {
            $hidden[csrf_token()] = csrf_hash();
        }

        if (is_array($hidden))
        {
            foreach ($hidden as $name => $value)
            {
                $form .= '<input type="hidden" name="'.$name.'" value="'.$value.'" style="display: none;" />'."\n";
            }
        }

        return $form;
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_open_multipart'))
{
    /**
     * Form Declaration - Multipart type
     *
     * Creates the opening portion of the form, but with "multipart/form-data".
     *
     * @param    string    the URI segments of the form destination
     * @param    array     a key/value pair of attributes
     * @param    array     a key/value pair hidden data
     *
     * @return    string
     */
    function form_open_multipart(string $action = '', array $attributes = [], array $hidden = []): string
    {
        if (is_string($attributes))
        {
            $attributes .= ' enctype="multipart/form-data"';
        } else
        {
            $attributes['enctype'] = 'multipart/form-data';
        }

        return form_open($action, $attributes, $hidden);
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_hidden'))
{
    /**
     * Hidden Input Field
     *
     * Generates hidden fields. You can pass a simple key/value string or
     * an associative array with multiple values.
     *
     * @param    mixed        $name  Field name
     * @param    string|array $value Field value
     * @param    bool         $recursing
     *
     * @return    string
     */
    function form_hidden($name, $value, bool $recursing = false): string
    {
        static $form;

        if ($recursing === false)
        {
            $form = "\n";
        }

        if (is_array($name))
        {
            foreach ($name as $key => $val)
            {
                form_hidden($key, $val, true);
            }

            return $form;
        }

        if (! is_array($value))
        {
            $form .= '<input type="hidden" name="'.$name.'" value="'.$value."\" />\n";
        } else
        {
            foreach ($value as $k => $v)
            {
                $k = is_int($k) ? '' : $k;
                form_hidden($name.'['.$k.']', $v, true);
            }
        }

        return $form;
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_input'))
{
    /**
     * Text Input Field. If 'type' is passed in the $type field, it will be
     * used as the input type, for making 'email', 'phone', etc input fields.
     *
     * @param    mixed  $data
     * @param    string $value
     * @param    mixed  $extra
     * @param   string  $type
     *
     * @return    string
     */
    function form_input($data = '', string $value = '', $extra = '', string $type = 'text'): string
    {
        $defaults = [
            'type'  => $type,
            'name'  => is_array($data) ? '' : $data,
            'value' => $value,
        ];

        return '<input '.parse_form_attributes($data, $defaults).stringify_attributes($extra)." />\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_password'))
{
    /**
     * Password Field
     *
     * Identical to the input function but adds the "password" type
     *
     * @param    mixed
     * @param    string
     * @param    mixed
     *
     * @return    string
     */
    function form_password($data = '', string $value = '', $extra = ''): string
    {
        is_array($data) OR $data = ['name' => $data];
        $data['type'] = 'password';

        return form_input($data, $value, $extra);
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_upload'))
{
    /**
     * Upload Field
     *
     * Identical to the input function but adds the "file" type
     *
     * @param    mixed
     * @param    string
     * @param    mixed
     *
     * @return    string
     */
    function form_upload($data = '', string $value = '', $extra = ''): string
    {
        $defaults = ['type' => 'file', 'name' => ''];
        is_array($data) OR $data = ['name' => $data];
        $data['type'] = 'file';

        return '<input '.parse_form_attributes($data, $defaults).stringify_attributes($extra)." />\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_textarea'))
{
    /**
     * Textarea field
     *
     * @param    mixed  $data
     * @param    string $value
     * @param    mixed  $extra
     *
     * @return    string
     */
    function form_textarea($data = '', string $value = '', $extra = ''): string
    {
        $defaults = [
            'name' => is_array($data) ? '' : $data,
            'cols' => '40',
            'rows' => '10',
        ];
        if (! is_array($data) OR ! isset($data['value']))
        {
            $val = $value;
        } else
        {
            $val = $data['value'];
            unset($data['value']); // textareas don't use the value attribute
        }

        return '<textarea '.parse_form_attributes($data, $defaults).stringify_attributes($extra).'>'
               .htmlspecialchars($val)
               ."</textarea>\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_multiselect'))
{
    /**
     * Multi-select menu
     *
     * @param    string
     * @param    array
     * @param    mixed
     * @param    mixed
     *
     * @return    string
     */
    function form_multiselect(string $name = '', array $options = [], array $selected = [], $extra = ''): string
    {
        $extra = stringify_attributes($extra);

        if (stripos($extra, 'multiple') === false)
        {
            $extra .= ' multiple="multiple"';
        }

        return form_dropdown($name, $options, $selected, $extra);
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_dropdown'))
{
    /**
     * Drop-down Menu
     *
     * @param    mixed $data
     * @param    mixed $options
     * @param    mixed $selected
     * @param    mixed $extra
     *
     * @return    string
     */
    function form_dropdown($data = '', $options = [], $selected = [], $extra = ''): string
    {
        $defaults = [];
        if (is_array($data))
        {
            if (isset($data['selected']))
            {
                $selected = $data['selected'];
                unset($data['selected']); // select tags don't have a selected attribute
            }
            if (isset($data['options']))
            {
                $options = $data['options'];
                unset($data['options']); // select tags don't use an options attribute
            }
        } else
        {
            $defaults = ['name' => $data];
        }

        is_array($selected) OR $selected = [$selected];
        is_array($options) OR $options = [$options];

        // If no selected state was submitted we will attempt to set it automatically
        if (empty($selected))
        {
            if (is_array($data))
            {
                if (isset($data['name'], $_POST[$data['name']]))
                {
                    $selected = [$_POST[$data['name']]];
                }
            } elseif (isset($_POST[$data]))
            {
                $selected = [$_POST[$data]];
            }
        }

        $extra    = stringify_attributes($extra);
        $multiple = (count($selected) > 1 && stripos($extra, 'multiple') === false) ? ' multiple="multiple"' : '';
        $form     = '<select '.rtrim(parse_form_attributes($data, $defaults)).$extra.$multiple.">\n";
        foreach ($options as $key => $val)
        {
            $key = (string)$key;
            if (is_array($val))
            {
                if (empty($val))
                {
                    continue;
                }
                $form .= '<optgroup label="'.$key."\">\n";
                foreach ($val as $optgroup_key => $optgroup_val)
                {
                    $sel = in_array($optgroup_key, $selected) ? ' selected="selected"' : '';
                    $form .= '<option value="'.htmlspecialchars($optgroup_key).'"'.$sel.'>'
                             .(string)$optgroup_val."</option>\n";
                }
                $form .= "</optgroup>\n";
            } else
            {
                $form .= '<option value="'.htmlspecialchars($key).'"'
                         .(in_array($key, $selected) ? ' selected="selected"' : '').'>'
                         .(string)$val."</option>\n";
            }
        }

        return $form."</select>\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_checkbox'))
{
    /**
     * Checkbox Field
     *
     * @param    mixed
     * @param    string
     * @param    bool
     * @param    mixed
     *
     * @return    string
     */
    function form_checkbox($data = '', string $value = '', bool $checked = false, $extra = ''): string
    {
        $defaults = ['type' => 'checkbox', 'name' => (! is_array($data) ? $data : ''), 'value' => $value];

        if (is_array($data) && array_key_exists('checked', $data))
        {
            $checked = $data['checked'];
            if ($checked == false)
            {
                unset($data['checked']);
            } else
            {
                $data['checked'] = 'checked';
            }
        }

        if ($checked == true)
        {
            $defaults['checked'] = 'checked';
        } else
        {
            unset($defaults['checked']);
        }

        return '<input '.parse_form_attributes($data, $defaults).stringify_attributes($extra)." />\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_radio'))
{
    /**
     * Radio Button
     *
     * @param    mixed
     * @param    string
     * @param    bool
     * @param    mixed
     *
     * @return    string
     */
    function form_radio($data = '', string $value = '', bool $checked = false, $extra = ''): string
    {
        is_array($data) OR $data = ['name' => $data];
        $data['type'] = 'radio';

        return form_checkbox($data, $value, $checked, $extra);
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_submit'))
{
    /**
     * Submit Button
     *
     * @param    mixed
     * @param    string
     * @param    mixed
     *
     * @return    string
     */
    function form_submit($data = '', string $value = '', $extra = ''): string
    {
        $defaults = [
            'type'  => 'submit',
            'name'  => is_array($data) ? '' : $data,
            'value' => $value,
        ];

        return '<input '.parse_form_attributes($data, $defaults).stringify_attributes($extra)." />\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_reset'))
{
    /**
     * Reset Button
     *
     * @param    mixed
     * @param    string
     * @param    mixed
     *
     * @return    string
     */
    function form_reset($data = '', string $value = '', $extra = ''): string
    {
        $defaults = [
            'type'  => 'reset',
            'name'  => is_array($data) ? '' : $data,
            'value' => $value,
        ];

        return '<input '.parse_form_attributes($data, $defaults).stringify_attributes($extra)." />\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_button'))
{
    /**
     * Form Button
     *
     * @param    mixed
     * @param    string
     * @param    mixed
     *
     * @return    string
     */
    function form_button($data = '', string $content = '', $extra = ''): string
    {
        $defaults = [
            'name' => is_array($data) ? '' : $data,
            'type' => 'button',
        ];

        if (is_array($data) && isset($data['content']))
        {
            $content = $data['content'];
            unset($data['content']); // content is not an attribute
        }

        return '<button '.parse_form_attributes($data, $defaults).stringify_attributes($extra).'>'
               .$content
               ."</button>\n";
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_label'))
{
    /**
     * Form Label Tag
     *
     * @param    string    The text to appear onscreen
     * @param    string    The id the label applies to
     * @param    array     Additional attributes
     *
     * @return    string
     */
    function form_label(string $label_text = '', string $id = '', array $attributes = []): string
    {
        $label = '<label';

        if ($id !== '')
        {
            $label .= ' for="'.$id.'"';
        }

        if (is_array($attributes) && count($attributes) > 0)
        {
            foreach ($attributes as $key => $val)
            {
                $label .= ' '.$key.'="'.$val.'"';
            }
        }

        return $label.'>'.$label_text.'</label>';
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_datalist'))
{
    /**
     * Datalist
     *
     * The <datalist> element specifies a list of pre-defined options for an <input> element.
     * Users will see a drop-down list of pre-defined options as they input data.
     * The list attribute of the <input> element, must refer to the id attribute of the <datalist> element.
     */
    function form_datalist($name, $value, $options)
    {
        $data = [
            'type'  => 'text',
            'name'  => $name,
            'list'  => $name.'_list',
            'value' => $value,
        ];

        $out = form_input($data)."\n";
        $out .= "<datalist id='".$name.'_list'."'>";

        foreach ($options as $option)
        {
            $out .= "<option value='$option'>"."\n";
        }

        $out .= "</datalist>"."\n";

        return $out;
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_fieldset'))
{
    /**
     * Fieldset Tag
     *
     * Used to produce <fieldset><legend>text</legend>.  To close fieldset
     * use form_fieldset_close()
     *
     * @param    string    The legend text
     * @param    array     Additional attributes
     *
     * @return    string
     */
    function form_fieldset(string $legend_text = '', array $attributes = []): string
    {
        $fieldset = '<fieldset'.stringify_attributes($attributes).">\n";

        if ($legend_text !== '')
        {
            return $fieldset.'<legend>'.$legend_text."</legend>\n";
        }

        return $fieldset;
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_fieldset_close'))
{
    /**
     * Fieldset Close Tag
     *
     * @param    string
     *
     * @return    string
     */
    function form_fieldset_close(string $extra = ''): string
    {
        return '</fieldset>'.$extra;
    }
}

//--------------------------------------------------------------------

if (! function_exists('form_close'))
{
    /**
     * Form Close Tag
     *
     * @param    string
     *
     * @return    string
     */
    function form_close(string $extra = ''): string
    {
        return '</form>'.$extra;
    }
}

//--------------------------------------------------------------------

if (! function_exists('set_value'))
{
    /**
     * Form Value
     *
     * Grabs a value from the POST array for the specified field so you can
     * re-populate an input field or textarea
     *
     * @param    string $field       Field name
     * @param    string $default     Default value
     * @param    bool   $html_escape Whether to escape HTML special characters or not
     *
     * @return    string
     */
    function set_value(string $field, string $default = '', bool $html_escape = true): string
    {
        $value = $_POST[$field] ?? $default;

        return ($html_escape) ? esc($value, 'html') : $value;
    }
}

//--------------------------------------------------------------------

if (! function_exists('set_select'))
{
    /**
     * Set Select
     *
     * Let's you set the selected value of a <select> menu via data in the POST array.
     * If Form Validation is active it retrieves the info from the validation class
     *
     * @param    string
     * @param    string
     * @param    bool
     *
     * @return    string
     */
    function set_select(string $field, string $value = '', bool $default = false): string
    {
        if (($input = $_POST[$field]) === null)
        {
            return ($default === true) ? ' selected="selected"' : '';
        }

        if (($input = $_POST[$field]) !== null)
        {
            if (is_array($input))
            {
                $value = (string)$value;

                // Note: in_array('', array(0)) returns TRUE, do not use it
                foreach ($input as &$v)
                {
                    if ($value === $v)
                    {
                        return ' selected="selected"';
                    }
                }

                return '';
            }
        }

        return ($input === $value) ? ' selected="selected"' : '';
    }
}

//--------------------------------------------------------------------

if (! function_exists('set_checkbox'))
{
    /**
     * Set Checkbox
     *
     * Let's you set the selected value of a checkbox via the value in the POST array.
     * If Form Validation is active it retrieves the info from the validation class
     *
     * @param    string
     * @param    string
     * @param    bool
     *
     * @return    string
     */
    function set_checkbox(string $field, string $value = '', bool $default = false): string
    {
        // Form inputs are always strings ...
        $value = (string)$value;

        $input = $_POST[$field];

        if (is_array($input))
        {
            // Note: in_array('', array(0)) returns TRUE, do not use it
            foreach ($input as &$v)
            {
                if ($value === $v)
                {
                    return ' checked="checked"';
                }
            }

            return '';
        }

        // Unchecked checkbox and radio inputs are not even submitted by browsers ...
        if ($_POST)
        {
            return ($input === $value) ? ' checked="checked"' : '';
        }

        return ($default === true) ? ' checked="checked"' : '';
    }
}

//--------------------------------------------------------------------

if (! function_exists('set_radio'))
{
    /**
     * Set Radio
     *
     * Let's you set the selected value of a radio field via info in the POST array.
     * If Form Validation is active it retrieves the info from the validation class
     *
     * @param    string $field
     * @param    string $value
     * @param    bool   $default
     *
     * @return    string
     */
    function set_radio(string $field, string $value = '', bool $default = false): string
    {
        // Form inputs are always strings ...
        $value = (string)$value;

        $input = $_POST[$field];

        if (is_array($input))
        {
            // Note: in_array('', array(0)) returns TRUE, do not use it
            foreach ($input as &$v)
            {
                if ($value === $v)
                {
                    return ' checked="checked"';
                }
            }

            return '';
        }

        // Unchecked checkbox and radio inputs are not even submitted by browsers ...
        if ($_POST)
        {
            return ($input === $value) ? ' checked="checked"' : '';
        }

        return ($default === true) ? ' checked="checked"' : '';
    }
}

//--------------------------------------------------------------------

if (! function_exists('parse_form_attributes'))
{
    /**
     * Parse the form attributes
     *
     * Helper function used by some of the form helpers
     *
     * @param    array $attributes List of attributes
     * @param    array $default    Default values
     *
     * @return    string
     */
    function parse_form_attributes($attributes, $default): string
    {
        if (is_array($attributes))
        {
            foreach ($default as $key => $val)
            {
                if (isset($attributes[$key]))
                {
                    $default[$key] = $attributes[$key];
                    unset($attributes[$key]);
                }
            }
            if (count($attributes) > 0)
            {
                $default = array_merge($default, $attributes);
            }
        }

        $att = '';

        foreach ($default as $key => $val)
        {
            if ($key === 'value')
            {
                $val = esc($val, 'html');
            }
            elseif ($key === 'name' && ! strlen($default['name']))
            {
                continue;
            }
            $att .= $key.'="'.$val.'" ';
        }

        return $att;
    }

    //--------------------------------------------------------------------
}

