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<?php

class WP_Widget_Media_Gallery extends WP_Widget_Media
{
    public function __construct()
    {
        parent::__construct('media_gallery', __('Gallery'), array('description' => __('Displays an image gallery.'), 'mime_type' => 'image'));
        $this->l10n = array_merge($this->l10n, array('no_media_selected' => __('No images selected'), 'add_media' => _x('Add Images', 'label for button in the gallery widget; should not be longer than ~13 characters long'), 'replace_media' => '', 'edit_media' => _x('Edit Gallery', 'label for button in the gallery widget; should not be longer than ~13 characters long')));
    }
    public function get_instance_schema()
    {
        $schema = array('title' => array('type' => 'string', 'default' => '', 'sanitize_callback' => 'sanitize_text_field', 'description' => __('Title for the widget'), 'should_preview_update' => false), 'ids' => array('type' => 'array', 'items' => array('type' => 'integer'), 'default' => array(), 'sanitize_callback' => 'wp_parse_id_list'), 'columns' => array('type' => 'integer', 'default' => 3, 'minimum' => 1, 'maximum' => 9), 'size' => array('type' => 'string', 'enum' => array_merge(get_intermediate_image_sizes(), array('full', 'custom')), 'default' => 'thumbnail'), 'link_type' => array('type' => 'string', 'enum' => array('post', 'file', 'none'), 'default' => 'post', 'media_prop' => 'link', 'should_preview_update' => false), 'orderby_random' => array('type' => 'boolean', 'default' => false, 'media_prop' => '_orderbyRandom', 'should_preview_update' => false));
        $schema = apply_filters("widget_{$this->id_base}_instance_schema", $schema, $this);
        return $schema;
    }
    public function render_media($instance)
    {
        $instance = array_merge(wp_list_pluck($this->get_instance_schema(), 'default'), $instance);
        $shortcode_atts = array_merge($instance, array('link' => $instance['link_type']));
        if ($instance['orderby_random']) {
            $shortcode_atts['orderby'] = 'rand';
        }
        echo gallery_shortcode($shortcode_atts);
    }
    public function enqueue_admin_scripts()
    {
        parent::enqueue_admin_scripts();
        $handle = 'media-gallery-widget';
        wp_enqueue_script($handle);
        $exported_schema = array();
        foreach ($this->get_instance_schema() as $field => $field_schema) {
            $exported_schema[$field] = wp_array_slice_assoc($field_schema, array('type', 'default', 'enum', 'minimum', 'format', 'media_prop', 'should_preview_update', 'items'));
        }
        wp_add_inline_script($handle, sprintf('wp.mediaWidgets.modelConstructors[ %s ].prototype.schema = %s;', wp_json_encode($this->id_base), wp_json_encode($exported_schema)));
        wp_add_inline_script($handle, sprintf('
					wp.mediaWidgets.controlConstructors[ %1$s ].prototype.mime_type = %2$s;
					_.extend( wp.mediaWidgets.controlConstructors[ %1$s ].prototype.l10n, %3$s );
				', wp_json_encode($this->id_base), wp_json_encode($this->widget_options['mime_type']), wp_json_encode($this->l10n)));
    }
    public function render_control_template_scripts()
    {
        parent::render_control_template_scripts();
        ?>
		<script type="text/html" id="tmpl-wp-media-widget-gallery-preview">
			<#
			var ids = _.filter( data.ids, function( id ) {
				return ( id in data.attachments );
			} );
			#>
			<# if ( ids.length ) { #>
				<ul class="gallery media-widget-gallery-preview" role="list">
					<# _.each( ids, function( id, index ) { #>
						<# var attachment = data.attachments[ id ]; #>
						<# if ( index < 6 ) { #>
							<li class="gallery-item">
								<div class="gallery-icon">
									<img alt="{{ attachment.alt }}"
										<# if ( index === 5 && data.ids.length > 6 ) { #> aria-hidden="true" <# } #>
										<# if ( attachment.sizes.thumbnail ) { #>
											src="{{ attachment.sizes.thumbnail.url }}" width="{{ attachment.sizes.thumbnail.width }}" height="{{ attachment.sizes.thumbnail.height }}"
										<# } else { #>
											src="{{ attachment.url }}"
										<# } #>
										<# if ( ! attachment.alt && attachment.filename ) { #>
											aria-label="
											<?php 
        echo esc_attr(sprintf(__('The current image has no alternative text. The file name is: %s'), '{{ attachment.filename }}'));
        ?>
											"
										<# } #>
									/>
									<# if ( index === 5 && data.ids.length > 6 ) { #>
									<div class="gallery-icon-placeholder">
										<p class="gallery-icon-placeholder-text" aria-label="
										<?php 
        printf(__('Additional images added to this gallery: %s'), '{{ data.ids.length - 5 }}');
        ?>
										">+{{ data.ids.length - 5 }}</p>
									</div>
									<# } #>
								</div>
							</li>
						<# } #>
					<# } ); #>
				</ul>
			<# } else { #>
				<div class="attachment-media-view">
					<button type="button" class="placeholder button-add-media"><?php 
        echo esc_html($this->l10n['add_media']);
        ?></button>
				</div>
			<# } #>
		</script>
		<?php 
    }
    protected function has_content($instance)
    {
        if (!empty($instance['ids'])) {
            $attachments = wp_parse_id_list($instance['ids']);
            foreach ($attachments as $attachment) {
                if ('attachment' !== get_post_type($attachment)) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }
}