<?php
// If this file is called directly, abort.
if ( ! defined( 'ABSPATH' ) ) {
    die();
}
/**
 * Custom Affiliate Links Metabox For Links Post Type.
 */
class Affiliate_Links_Metabox {

    /**
     * List of custom fields.
     */
    public $fields = array(
        array(
            'name'        => '_affiliate_links_target',
            'title'       => 'Link Target URL',
            'description' => '* Enter your target URL',
            'type'        => 'url',
            'required'    => 'required'
        ),
        array(
            'name'        => '_affiliate_links_description',
            'title'       => 'Link Description',
            'description' => 'Describe your link',
            'type'        => 'text'
        ),
        array(
            'name'        => '_affiliate_links_nofollow',
            'global_name' => 'nofollow',
            'title'       => 'Nofollow Link',
            'type'        => 'checkbox',
            'description' => 'Add "X-Robots-Tag: noindex, nofollow" to HTTP headers'
        ),
        array(
            'name'        => '_affiliate_links_redirect',
            'global_name' => 'redirect',
            'title'       => 'Redirect Type',
            'type'        => 'radio',
            'description' => 'Set redirection HTTP status code',
            'values'      => array(
                '301' => '301 Moved Permanently',
                '302' => '302 Found',
                '307' => '307 Temporary Redirect'
            )
        ),
    );

    public $admin_grid_fields = array(
        '_affiliate_links_target',
        '_affiliate_links_description',
        '_affiliate_links_redirect'
    );

    /**
     * Hook into the appropriate actions when the class is constructed.
     */
    public function __construct() {

        // Add metabox actions.
        add_action( 'load-post.php', array( $this, 'init_metabox' ) );
        add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );

        // Add custom field values to admin grid columns.
        add_filter( 'manage_posts_columns', array( $this, 'columns_head' ) );
        add_action( 'manage_posts_custom_column', array( $this, 'columns_content' ), 10, 2 );
        add_action( 'restrict_manage_posts', array( $this, 'restrict_links_by_cat' ) );

        // Add custom styling.
        add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );

        // Remove the Yoast SEO columns
        add_action( 'manage_edit-' . Affiliate_Links::$post_type . '_columns', array( $this, 'hide_yoast_columns' ) );

    }

    /**
     * Remove unused Yoast columns
     */
    public function hide_yoast_columns( $columns ) {

        unset( $columns['wpseo-score'] );
        unset( $columns['wpseo-title'] );
        unset( $columns['wpseo-metadesc'] );
        unset( $columns['wpseo-focuskw'] );

        return $columns;

    }

    /**
     * Add admin css file.
     */
    public function enqueue_scripts( $hook ) {

        if ( $hook != 'post.php' AND $hook != 'post-new.php' AND $hook != 'affiliate-links_page_affiliate_links' ) {
            return;
        }

        //css
        wp_register_style( 'affiliate-links-css', AFFILIATE_LINKS_PLUGIN_URL . 'admin/css/affiliate-links-admin.css', false, '1.6' );
        wp_enqueue_style( 'affiliate-links-css' );

        //js
        wp_enqueue_script( 'affiliate-links-js', AFFILIATE_LINKS_PLUGIN_URL . 'admin/js/affiliate-links-admin.js', array('jquery'), '1.6', true );

    }

    /**
     * Modify admin grid column headers.
     */
    public function columns_head( $defaults ) {

        global $typenow;

        if ( $typenow == Affiliate_Links::$post_type ) {

            $defaults['permalink'] = __( 'Link URL', Affiliate_Links::$text_domain );

            foreach( $this->fields as $field ) {

                if( in_array( $field['name'], $this->admin_grid_fields ) )
                    $defaults[ $field['name'] ] = $field['title'];

            }

            $defaults['_affiliate_links_stat'] = __( 'Hits', Affiliate_Links::$text_domain );

        }

        return $defaults;

    }

    /**
     * Modify admin grid columns.
     */
    public function columns_content( $column_name, $post_id ) {

        switch ( $column_name ) {
            case 'permalink' :
                echo esc_html( get_the_permalink( $post_id ) );
                break;
            case '_affiliate_links_target' :
                echo esc_html( get_post_meta( $post_id, '_affiliate_links_target', true ) );
                break;
            case '_affiliate_links_stat' :
                echo esc_html( get_post_meta( $post_id, '_affiliate_links_stat', true ) );
                break;
            case '_affiliate_links_description' :
                echo esc_html( get_post_meta( $post_id, '_affiliate_links_description', true ) );
                break;
            case '_affiliate_links_redirect' :
                echo esc_html( get_post_meta( $post_id, '_affiliate_links_redirect', true ) );
                break;
            case '_affiliate_links_nofollow' :
                echo esc_html( get_post_meta( $post_id, '_affiliate_links_nofollow', true ) );
                break;
        }

    }

    /**
     * Add link category filter to admin grid.
     */
    function restrict_links_by_cat() {

        global $typenow;
        global $wp_query;

        if ( $typenow == Affiliate_Links::$post_type ) {

            if( !empty( $wp_query->query[ Affiliate_Links::$taxonomy ] ) ) {
                $selected = $wp_query->query[ Affiliate_Links::$taxonomy ];
            } else {
                $selected = 0;
            }

            wp_dropdown_categories( array(
                'show_option_all' =>  __("All Categories", Affiliate_Links::$text_domain),
                'taxonomy'        =>  Affiliate_Links::$taxonomy,
                'value_field'     => 'slug',
                'name'            =>  Affiliate_Links::$taxonomy,
                'orderby'         =>  'name',
                'selected'        =>  $selected,
                'hierarchical'    =>  true,
                'depth'           =>  3,
                'show_count'      =>  true,
                'hide_empty'      =>  true,
            ) );

        }

    }

    /**
     * Add appropriate actions.
     */
    public function init_metabox() {

        add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ), 0 );
        add_action( 'save_post', array( $this, 'save' ) );

    }

    /**
     * Adds the meta box container.
     */
    public function add_meta_box( $post_type ) {

        $post_types = array( Affiliate_Links::$post_type );

        if ( in_array( $post_type, $post_types ) ) {

            add_meta_box(
                'affiliate_links_settings',
                __( 'Link Settings', Affiliate_Links::$text_domain ),
                array( $this, 'render_metabox_content' ),
                $post_type,
                'normal',
                'high'
            );

            add_meta_box(
                'affiliate_links_embed',
                __( 'Link Embedding', Affiliate_Links::$text_domain ),
                array( $this, 'render_metabox_embed' ),
                $post_type,
                'normal',
                'high'
            );

            add_meta_box(
                'affiliate_links_sidebar',
                __( 'Information', Affiliate_Links::$text_domain ),
                array( $this, 'render_metabox_sidebar' ),
                $post_type,
                'side',
                'default'
            );

        }

    }

    /**
     * Save metabox.
     */
    public function save( $post_id ) {

        // Check if our nonce is set.
        if ( ! isset( $_POST['affiliate_links_custom_box_nonce'] ) )
            return $post_id;

        $nonce = $_POST['affiliate_links_custom_box_nonce'];

        // Verify that the nonce is valid.
        if ( ! wp_verify_nonce( $nonce, 'affiliate_links_custom_box' ) )
            return $post_id;

        // If this is an autosave, our form has not been submitted, so we don't want to do anything.
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
            return $post_id;

        // Check the user's permissions.
        if ( ! current_user_can( 'edit_post', $post_id ) )
            return $post_id;

        foreach( $this->fields as $field ) {

            // Sanitize the user input.
            $custom_field = isset( $_POST[ $field['name'] ] ) ? sanitize_text_field( $_POST[ $field['name'] ] ) : '';

            // Update the meta field.
            update_post_meta( $post_id, $field['name'], $custom_field );

        }

        // reset stat count
        if( isset( $_POST['_affiliate_links_stat'] ) ){
            $count = (int) $_POST['_affiliate_links_stat'];
            // Update the meta field.
            update_post_meta( $post_id, '_affiliate_links_stat', $count );
        }

    }

    /**
     * Render metabox content.
     */
    public function render_metabox_content( $post ) {

        echo '<table class="form-table">';

        // Add an nonce field so we can check for it later.
        wp_nonce_field( 'affiliate_links_custom_box', 'affiliate_links_custom_box_nonce' );

        $this->link_field( $post->ID );

        foreach( $this->fields as $field ){

            // Retrieve an existing value from the database.
            $value = get_post_meta( $post->ID, $field['name'], true );
            $this->render_field( $field, $value );

        }

        $this->stats_field( $post->ID );

        echo '</table>';

    }

    /**
     * Render embed metabox content.
     */
    public function render_metabox_embed( $post ) {

        load_template( dirname( __FILE__ ) . '/partials/metabox-embed.php' );

    }

    /**
     * Render sidebar  metabox content.
     */
    public function render_metabox_sidebar( $post ) {

        load_template( dirname( __FILE__ ) . '/partials/metabox-sidebar.php' );

    }

    /**
     * Generate settings field html.
     */
    public function render_field( $field, $value ) {

        $func_name = 'render_' . $field['type'] . '_field';

        if( method_exists( __CLASS__, $func_name ) ) {

            call_user_func_array( array( $this, $func_name ), array('field' => $field, 'value' => $value ) );

        } else {

            call_user_func_array( array( $this, 'render_text_field' ), array('field' => $field, 'value' => $value ) );

        }

    }

    /**
     * Generate text input field.
     */
    public function render_text_field( $field, $value ) {

        $name  = esc_attr( $field['name'] );
        $title = esc_attr( $field['title'] );
        $desc  = esc_html( $field['description'] );
        $type  = esc_attr( $field['type'] );
        ?>
        <tr>
            <th>
                <label for="<?php echo $name ?>" class="<?php echo $name ?>_label"><?php echo $title ?></label>
            </th>
            <td>
                <input
                    type="<?php echo $type ?>"
                    id="<?php echo $name ?>"
                    name="<?php echo $name ?>"
                    class="<?php echo $name ?>_field"
                    <?php if( !empty($field['required']) ) echo $field['required'] ?>
                    value="<?php echo esc_attr__( $value ) ?>"
                >
                <p class="description"><?php echo $desc ?></p>
            </td>
        </tr>
        <?php

    }

    /**
     * Generate checkbox field.
     */
    public function render_checkbox_field( $field, $value ) {

        $name  = esc_attr( $field['name'] );
        $title = esc_attr( $field['title'] );
        $desc  = esc_html( $field['description'] );
        $type  = esc_attr( $field['type'] );

        if( !empty( Affiliate_Links::$settings[ $field['global_name'] ] ) ) {
            $default_val = Affiliate_Links::$settings[ $field['global_name'] ];
        } else {
            $default_val = 0;
        }

        $checked_value = isset( $value ) ? $value : $default_val;
        ?>
        <tr>
            <th>
                <label for="<?php echo $name ?>" class="<?php echo $name ?>_label"><?php echo $title ?></label>
            </th>
            <td>
                <input
                    type="<?php echo $type ?>"
                    id="<?php echo $name ?>"
                    name="<?php echo $name ?>"
                    class="<?php echo $name ?>_field"
                    value="1"
                    <?php checked( $checked_value, 1 ) ?>
                >
                <label for="<?php echo $name ?>">
                    <?php echo $desc ?>
                </label>
            </td>
        </tr>
        <?php

    }

    /**
     * Generate radio button fields.
     */
    public function render_radio_field( $field, $value ) {

        $title = esc_attr( $field['title'] );
        $desc  = esc_html( $field['description'] );
        $type  = esc_attr( $field['type'] );

        $values = $field['values'];
        reset($values);
        $default_val = key($values);

        if( !empty( Affiliate_Links::$settings[ $field['global_name'] ] ) ) {
            $default_val = Affiliate_Links::$settings[ $field['global_name'] ];
        }

        $checked_value = empty( $value ) ? $default_val : $value;
        ?>
        <tr>
            <th><?php echo $title ?></th>
            <td>
                <?php foreach( $values as $key => $value ) { ?>
                    <input
                        type="<?php echo $type ?>"
                        id="<?php echo esc_attr( $field['name'] . '_' . $key ) ?>"
                        name="<?php echo esc_attr( $field['name'] ) ?>"
                        value="<?php echo esc_attr( $key ) ?>"
                        <?php checked( $checked_value, $key ) ?>
                    >
                    <label for="<?php echo esc_attr( $field['name'] . '_' . $key ) ?>">
                        <?php echo esc_html(  $value ) ?>
                    </label>
                    <br>
                <?php } ?>
                <p class="description"><?php echo $desc ?></p>
            </td>
        </tr>
        <?php

    }

    /**
     * Generate fields for hit stats displaying.
     */
    public function stats_field( $post_id ) {

        $count = esc_html( get_post_meta( $post_id, '_affiliate_links_stat', true ) );
        ?>
        <tr>
            <th><?php _e( 'Total Hits', Affiliate_Links::$text_domain ) ?></th>
            <td>
                <?php if( $count ){ ?>
                    <span class="affiliate_links_total_count"><?php echo $count ?></span>
                    <span class="affiliate_links_reset_button" data-meta="_affiliate_links_stat" data-confirm="<?php _e( 'Are you sure?', Affiliate_Links::$text_domain ) ?>">
                        <button type="button" class="button button-small hide-if-no-js"><?php _e( 'Reset count', Affiliate_Links::$text_domain ) ?></button>
                    </span>
                <?php } else { ?>
                    <span class="affiliate_links_total_count">-</span>
                <?php } ?>
                <p class="description"><?php _e( 'Total count of link redirects', Affiliate_Links::$text_domain ) ?></p>
            </td>
        </tr>
        <?php

    }

    /**
     * Generate fields for permalink displaying.
     */
    public function link_field( $post_id ) {

        ?>
        <tr>
            <th><?php _e( 'Your link', Affiliate_Links::$text_domain ) ?></th>
            <td>
                <span class="affiliate_links_copy_link"><?php the_permalink( $post_id ) ?></span>
                <span class="affiliate_links_copy_button">
                    <button type="button" class="button button-small hide-if-no-js"><?php _e( 'Copy', Affiliate_Links::$text_domain ) ?></button>
                </span>
                <p class="description"><?php _e( 'To change this link you should edit Permalink at the top of screen', Affiliate_Links::$text_domain ) ?></p>
            </td>
        </tr>
        <?php

    }

}

/**
 * Calls the class on the post edit screen.
 */
if ( is_admin() ) {

    new Affiliate_Links_Metabox();

}