<?php
// Details: https://wordpress.stackexchange.com/questions/316454/copy-attachments-to-another-post-type-and-change-attachment-url/316669#316669
// File: import-pics.php

require_once $_SERVER['DOCUMENT_ROOT'] . '/wp-load.php';

global $current_user, $imic_options; // Use global
wp_get_current_user(); // Make sure global is set, if not set it.

$yourID = $current_user->ID;
$propertyID = $_POST['propertyID'];
$vidID = $_POST['videoID'];

$path = WP_CONTENT_DIR . '/uploads/' . $yourID . '/' . $vidID;
$path2 = $yourID . '/' . $vidID; // relative to wp-content/uploads
$prop_att_ids = (array) get_post_meta( $propertyID, 'imic_property_sights', false );

// Check copied attachments and don't include already copied ones.
$copied_atts = (array) get_post_meta( $vidID, '_copied_imic_property_sights', true );
$copied_atts = array_unique( array_filter( $copied_atts ) );
$to_copy = array_diff( array_unique( array_filter( $prop_att_ids ) ), $copied_atts );
// These two are for testing:
echo 'Old $copied_atts: ' . implode( ', ', $copied_atts ) . '<br>';
echo '$prop_att_ids: ' . implode( ', ', $prop_att_ids ) . '<br>';

foreach ( $to_copy as $att_id ) {
    // Check if we have a valid image/attachment.
    if ( $att_id && $file = get_attached_file( $att_id ) ) {
        $filename = basename( $file );
        $file2 = $path . '/' . wp_unique_filename( $path, $filename );

        // Copy the image file to $path.
        if ( @copy( $file, $file2 ) ) {
            // Copy the attachment (post) data.
            $att = get_post( $att_id, ARRAY_A );
            unset( $att['ID'] );
            $att_id2 = wp_insert_attachment( $att, $file2 );

            // Then add the meta data `vid_pix`.
            add_post_meta( $vidID, 'vid_pix', $att_id2 );

            // Copy the attachment's meta data. (no thumbnails)
            $data = wp_get_attachment_metadata( $att_id );
            $data['file'] = $path2 . '/' . basename( $file2 );
            $data['sizes'] = [];
            wp_update_attachment_metadata( $att_id2, $data );

            // Add to copied attachments list.
            $copied_atts[ $att_id2 ] = $att_id;

            $url = wp_get_attachment_image_url( $att_id2, 'full' );   // test
            echo 'File copied! ' . make_clickable( $url ) . '<br>';   // test
        } else {
            echo "Could not copy <i>$file</i> to <b>$file2</b>!<br>"; // test
        }
    } else {
        echo 'Invalid attachment ID or missing attached file.<br>';   // test
    }
}

// Updates copied attachments.
update_post_meta( $vidID, '_copied_imic_property_sights', $copied_atts );

// These two are for testing:
echo 'New $copied_atts: ' . implode( ', ', $copied_atts ) . '<br>';
echo 'vid_pix: ' . implode( ', ', get_post_meta( $vidID, 'vid_pix', false ) ) . '<br>';

?>