<?php

add_action( 'admin_init', 'theme_options_init' );
add_action( 'admin_menu', 'theme_options_add_page' );

/**
 * Init plugin options to white list our options
 */
function theme_options_init(){
    register_setting( 'sample_options', 'sample_theme_options', 'theme_options_validate' );
}

/**
 * Load up the menu page
 */
function theme_options_add_page() {
    add_theme_page( __( 'Theme Options' ), __( 'Theme Options' ), 'edit_theme_options', 'theme_options', 'theme_options_do_page' );
}

/**
 * Create arrays for our select and radio options
 */
$select_options = array(
    '0' => array(
        'value' =>  '0',
        'label' => __( 'Zero' )
    ),
    '1' => array(
        'value' =>  '1',
        'label' => __( 'One' )
    ),
    '2' => array(
        'value' => '2',
        'label' => __( 'Two' )
    ),
    '3' => array(
        'value' => '3',
        'label' => __( 'Three' )
    ),
    '4' => array(
        'value' => '4',
        'label' => __( 'Four' )
    ),
    '5' => array(
        'value' => '3',
        'label' => __( 'Five' )
    )
);

$radio_options = array(
    'yes' => array(
        'value' => 'yes',
        'label' => __( 'Yes' )
    ),
    'no' => array(
        'value' => 'no',
        'label' => __( 'No' )
    ),
    'maybe' => array(
        'value' => 'maybe',
        'label' => __( 'Maybe' )
    )
);

/**
 * Create the options page
 */
function theme_options_do_page() {
    global $select_options, $radio_options;

    if ( ! isset( $_REQUEST['updated'] ) )
        $_REQUEST['updated'] = false;

    ?>
    <div class="wrap">
        <?php screen_icon(); echo "<h2>" . get_current_theme() . __( ' Theme Options' ) . "</h2>"; ?>

        <?php if ( false !== $_REQUEST['updated'] ) : ?>
        <div class="updated fade"><p><strong><?php _e( 'Options saved' ); ?></strong></p></div>
        <?php endif; ?>

        <form method="post" action="options.php">
            <?php settings_fields( 'sample_options' ); ?>
            <?php $options = get_option( 'sample_theme_options' ); ?>

            <table class="form-table">

                <?php
                /**
                 * A sample checkbox option
                 */
                ?>
                <tr valign="top"><th scope="row"><?php _e( 'A checkbox' ); ?></th>
                    <td>
                        <input id="sample_theme_options[option1]" name="sample_theme_options[option1]" type="checkbox" value="1" <?php checked( '1', $options['option1'] ); ?> />
                        <label class="description" for="sample_theme_options[option1]"><?php _e( 'Sample checkbox' ); ?></label>
                    </td>
                </tr>

                <?php
                /**
                 * A sample text input option
                 */
                ?>
                <tr valign="top"><th scope="row"><?php _e( 'Some text' ); ?></th>
                    <td>
                        <input id="sample_theme_options[sometext]" class="regular-text" type="text" name="sample_theme_options[sometext]" value="<?php esc_attr_e( $options['sometext'] ); ?>" />
                        <label class="description" for="sample_theme_options[sometext]"><?php _e( 'Sample text input' ); ?></label>
                    </td>
                </tr>

                <?php
                /**
                 * A sample select input option
                 */
                ?>
                <tr valign="top"><th scope="row"><?php _e( 'Select input' ); ?></th>
                    <td>
                        <select name="sample_theme_options[selectinput]">
                            <?php
                                $selected = $options['selectinput'];
                                $p = '';
                                $r = '';

                                foreach ( $select_options as $option ) {
                                    $label = $option['label'];
                                    if ( $selected == $option['value'] ) // Make default first in list
                                        $p = "\n\t<option style=\"padding-right: 10px;\" selected='selected' value='" . esc_attr( $option['value'] ) . "'>$label</option>";
                                    else
                                        $r .= "\n\t<option style=\"padding-right: 10px;\" value='" . esc_attr( $option['value'] ) . "'>$label</option>";
                                }
                                echo $p . $r;
                            ?>
                        </select>
                        <label class="description" for="sample_theme_options[selectinput]"><?php _e( 'Sample select input' ); ?></label>
                    </td>
                </tr>

                <?php
                /**
                 * A sample of radio buttons
                 */
                ?>
                <tr valign="top"><th scope="row"><?php _e( 'Radio buttons' ); ?></th>
                    <td>
                        <fieldset><legend class="screen-reader-text"><span><?php _e( 'Radio buttons' ); ?></span></legend>
                        <?php
                            if ( ! isset( $checked ) )
                                $checked = '';
                            foreach ( $radio_options as $option ) {
                                $radio_setting = $options['radioinput'];

                                if ( '' != $radio_setting ) {
                                    if ( $options['radioinput'] == $option['value'] ) {
                                        $checked = "checked=\"checked\"";
                                    } else {
                                        $checked = '';
                                    }
                                }
                                ?>
                                <label class="description"><input type="radio" name="sample_theme_options[radioinput]" value="<?php esc_attr_e( $option['value'] ); ?>" <?php echo $checked; ?> /> <?php echo $option['label']; ?></label><br />
                                <?php
                            }
                        ?>
                        </fieldset>
                    </td>
                </tr>

                <?php
                /**
                 * A sample textarea option
                 */
                ?>
                <tr valign="top"><th scope="row"><?php _e( 'A textbox' ); ?></th>
                    <td>
                        <textarea id="sample_theme_options[sometextarea]" class="large-text" cols="50" rows="10" name="sample_theme_options[sometextarea]"><?php echo stripslashes( $options['sometextarea'] ); ?></textarea>
                        <label class="description" for="sample_theme_options[sometextarea]"><?php _e( 'Sample text box' ); ?></label>
                    </td>
                </tr>
            </table>

            <p class="submit">
                <input type="submit" class="button-primary" value="<?php _e( 'Save Options' ); ?>" />
            </p>
        </form>
    </div>
    <?php
}

/**
 * Sanitize and validate input. Accepts an array, return a sanitized array.
 */
function theme_options_validate( $input ) {
    global $select_options, $radio_options;

    // Our checkbox value is either 0 or 1
    if ( ! isset( $input['option1'] ) )
        $input['option1'] = null;
    $input['option1'] = ( $input['option1'] == 1 ? 1 : 0 );

    // Say our text option must be safe text with no HTML tags
    $input['sometext'] = wp_filter_nohtml_kses( $input['sometext'] );

    // Our select option must actually be in our array of select options
    if ( ! array_key_exists( $input['selectinput'], $select_options ) )
        $input['selectinput'] = null;

    // Our radio option must actually be in our array of radio options
    if ( ! isset( $input['radioinput'] ) )
        $input['radioinput'] = null;
    if ( ! array_key_exists( $input['radioinput'], $radio_options ) )
        $input['radioinput'] = null;

    // Say our textarea option must be safe text with the allowed tags for posts
    $input['sometextarea'] = wp_filter_post_kses( $input['sometextarea'] );

    return $input;
}

// adapted from http://planetozh.com/blog/2009/05/handling-plugins-options-in-wordpress-28-with-register_setting/