<?php
/*
Plugin Name: Address Geocoder
Description: Attach location information to posts
Version: 1.0.1
Contributors: martyspellerberg, mgibbs189
Author: Marty Spellerberg
Author URI: http://martyspellerberg.com
License: GPLv2+
*/

class Address_Geocoder
{

    public $available_post_types = array();
    public $options;


    function __construct() {
        add_action( 'admin_init', array( $this, 'admin_init' ) );
        add_action( 'admin_menu', array( $this, 'admin_menu' ) );
    }


    /**
     * Initialize
     */
    function admin_init() {

        // Class properties
        $post_types = get_post_types();
        $excluded = array( 'attachment', 'revision', 'nav_menu_item' );
        $this->available_post_types = array_diff( $post_types, $excluded );
        $this->options = get_option( 'address_geocoder_options' );

        // Set some default options if none are already set
        if( ! $this->options ) {
            $this->options = $this->available_post_types;
        }

        // Actions
        add_action( 'admin_enqueue_scripts', array( $this, 'admin_enqueue_scripts' ) );
        add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ) );
        add_action( 'save_post', array( $this, 'save_post' ), 10, 2 );

        // Settings
        register_setting( 'address_geocoder_options', 'address_geocoder_options', array( $this, 'validate_options' ) );
    }


    /**
     * Register the menu item under "Settings"
     */
    function admin_menu() {
        add_options_page( 'Address Geocoder', 'Address Geocoder', 'manage_options', 'address-geocoder-options', array( $this, 'options_page' ) );
    }


    /**
     * Enqueue admin scripts
     */
    function admin_enqueue_scripts() {

        // Load scripts only when necessary
        if ( $this->is_geocoder_needed() ) {

            $address_geocoder_options = get_option('address_geocoder_options');
            $apikey = $address_geocoder_options['apikey'];

            if ( ! empty( $apikey ) ) {
                $mapsapi = '//maps.googleapis.com/maps/api/js?key=' . $apikey;
                wp_register_script( 'googlemaps', $mapsapi );
                wp_register_script( 'marty_geocode_js', plugins_url( '/address-geocoder.js', __FILE__ ) );

                wp_enqueue_script( 'googlemaps' );
                wp_enqueue_script( 'marty_geocode_js' );
            }
        }
    }


    /**
     * Determine whether the geocoder metabox appears on the current page
     */
    function is_geocoder_needed() {

        $pagenow = isset( $GLOBALS['pagenow'] ) ? $GLOBALS['pagenow'] : '';

        if ( 'post.php' == $pagenow ) {
            $post_type = get_post_type( $_GET['post'] );
        }
        elseif ( 'post-new.php' == $pagenow ) {
            $post_type = isset( $_GET['post_type'] ) ? $_GET['post_type'] : 'post';
        }

        if ( !empty( $post_type ) && ! empty( $this->options ) ) {
            if ( in_array( $post_type, $this->available_post_types ) && 'exclude' != $this->options[ $post_type ] ) {
                return true;
            }
        }

        return false;
    }

    /**
     * Add the "Geocoder" meta box to the appropriate pages
     */
    function add_meta_boxes( $post_type ) {
        if ( in_array( $post_type, $this->available_post_types ) && 'exclude' != $this->options[ $post_type ] ) {
            $current_post_type = get_post_type_object( $post_type );
            $metabox_title = empty( $this->options['meta-box-title'] ) ? $current_post_type->labels->singular_name . ' Location' : $this->options['meta-box-title'];

            add_meta_box( 'martygeocoder', $metabox_title, array( $this, 'meta_box_html' ), $post_type, 'normal', 'high' );
        }
    }


    /**
     * Generate the meta box HTML
     */
    function meta_box_html( $object, $box ) {

        wp_nonce_field( 'save_latlng', 'geocoder_nonce' );
        $address_geocoder_options = get_option('address_geocoder_options');
        $apikey = $address_geocoder_options['apikey'];
        if ( $apikey && $apikey != '' ): ?>
            <div style="overflow:hidden; width:100%">
                <div id="geocodepreview" style="float:right; width:240px; height:240px; border:1px solid #DFDFDF"></div>
                <div style="margin-right:260px">
                    <p>
                        <label for="martygeocoderaddress">Address</label><br />
                        <input class="widefat" type="text" name="martygeocoderaddress" id="martygeocoderaddress" value="<?php echo esc_attr( get_post_meta( $object->ID, 'martygeocoderaddress', true ) ); ?>" />
                    </p>
                    <p>
                        <label for="martygeocoderlatlng">Lat/Lng</label><br />
                        <input class="widefat" type="text" name="martygeocoderlatlng" id="martygeocoderlatlng" value="<?php echo esc_attr( get_post_meta( $object->ID, 'martygeocoderlatlng', true ) ); ?>" />
                    </p>
                    <p>
                        <a id="geocode" class="button">Geocode Address</a>
                    </p>
                </div>
            </div>
        <?php else : ?>
            <p>A Google Maps API Key is required. <a href="options-general.php?page=address-geocoder-options">Go to Settings.</a></p>
        <?php endif;
    }


    /**
     * Generate the options page HTML
     */
    function options_page() {

        if ( ! isset( $_REQUEST['settings-updated'] ) ) {
            $_REQUEST['settings-updated'] = false;
        }

        $apikey = empty( $this->options['apikey'] ) ? '' : $this->options['apikey'];
?>

<div class="wrap">
    <h1><?php _e( 'Address Geocoder' ); ?></h1>
    <form method="post" action="options.php">
        <?php settings_fields( 'address_geocoder_options' ); ?>

        <h3>Google Maps API Key</h3>
        <p>Address Geocoder requires a Google Maps API Key to work. You can get a free API Key here: <a href="https://developers.google.com/maps/documentation/javascript/tutorial#api_key">Instructions for obtaining a key.</a></p>
        <p><input type="input" id="geocoder-apikey" name="address_geocoder_options[apikey]" value="<?php echo esc_attr( $apikey ); ?>" /><br />
        <label class="description" for="geocoder-apikey">Your API Key</label></p>

        <h3>Show Metabox on Post Types</h3>

        <?php foreach ( $this->options as $post_type => $status ) : ?>
            <?php if ( $post_type != 'apikey') : ?>
                <?php $checked = ( 'exclude' != $status ) ? ' checked="checked"' : ''; ?>
                <p>
                    <input type="checkbox" id="geocoder-type-<?php echo $post_type; ?>" name="address_geocoder_options[<?php echo $post_type ?>]" value="enabled" <?php echo $checked; ?> />
                    <label class="description" for="geocoder-type-<?php echo $post_type; ?>"><?php echo $post_type; ?></label>
                </p>
            <?php endif; ?>
        <?php endforeach; ?>

        <h3>Meta Box Title</h3>
        <p><input type="input" id="geocoder-meta-box-title" name="address_geocoder_options[meta-box-title]" value="<?php echo empty( $this->options['meta-box-title'] ) ? '' : esc_attr( $this->options['meta-box-title'] ); ?>" /><br>
        <label class="description" for="geocoder-meta-box-title">Custom Meta Box Title</label></p>

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

<?php
    }


    /**
     * Validate the options
     */
    function validate_options( $input ) {
        foreach ( $this->available_post_types as $post_type ) {
            if ( ! isset( $input[ $post_type ] ) ) {
                $input[ $post_type ] = 'exclude';
            }
        }

        if ( isset( $input['meta-box-title'] ) ) {
            $input['meta-box-title'] = sanitize_text_field( $input['meta-box-title'] );
        }
        
        return $input;
    }


    /**
     * Attach geocode data to posts
     */
    function save_post( $post_id, $post ) {

        // Skip when nonce isn't present
        if ( ! isset( $_POST['geocoder_nonce'] ) || ! wp_verify_nonce( $_POST['geocoder_nonce'], 'save_latlng' ) ) {
            return $post_id;
        }

        // Ensure proper access rights
        if ( ! current_user_can( 'edit_post', $post_id ) ) {
            return $post_id;
        }

        // Save address
        $address_key = 'martygeocoderaddress';
        $address = isset( $_POST[ $address_key ] ) ? sanitize_text_field( $_POST[ $address_key ] ) : '';
        if ( empty( $address ) ) {
            delete_post_meta( $post_id, $address_key );
        }
        else {
            update_post_meta( $post_id, $address_key, $address );
        }

        // Save lat/lng
        $latlng_key = 'martygeocoderlatlng';
        $latlng = isset( $_POST[ $latlng_key ] ) ? sanitize_text_field( $_POST[ $latlng_key ] ) : '';
        if ( empty( $latlng ) ) {
            delete_post_meta( $post_id, $latlng_key );
        }
        else {
            update_post_meta( $post_id, $latlng_key, $latlng );
        }
    }
}


$address_geocoder = new Address_Geocoder();


// Backwards compatibility
function get_geocode_latlng( $post_id ) {
    return get_post_meta( $post_id, 'martygeocoderlatlng', true );
}

function get_geocode_lat( $post_id ) {
    $latlng = get_post_meta( $post_id, 'martygeocoderlatlng', true );
    $latlng = explode( ',', $latlng );
    return substr( $latlng[0], 1 );
}

function get_geocode_lng( $post_id ) {
    $latlng = get_post_meta( $post_id, 'martygeocoderlatlng', true );
    $latlng = explode( ',', $latlng );
    return substr( $latlng[1], 0, -1 );
}

function get_geocode_address( $post_id ) {
    return get_post_meta( $post_id, 'martygeocoderaddress', true );
}