<?php

defined('ABSPATH') || exit;

/**
 * @ignore
 * @return null|object
 */
function _mc4wp_400_find_grouping_for_interest_category($groupings, $interest_category)
{
    foreach ($groupings as $grouping) {
        // cast to stdClass because of missing class
        $grouping = (object) (array) $grouping;

        if ($grouping->name === $interest_category->title) {
            return $grouping;
        }
    }

    return null;
}

/**
 * @ignore
 * @return null|object
 */
function _mc4wp_400_find_group_for_interest($groups, $interest)
{
    foreach ($groups as $group_id => $group_name) {
        if ($group_name === $interest->name) {
            return (object) [
                'name' => $group_name,
                'id'   => $group_id,
            ];
        }
    }

    return null;
}

// in case the migration is _very_ late to the party
if (! class_exists('MC4WP_API_V3')) {
    return;
}

$options = get_option('mc4wp', []);
if (empty($options['api_key'])) {
    return;
}

// get current state from transient
$lists = get_transient('mc4wp_mailchimp_lists_fallback');
if (empty($lists)) {
    return;
}

@set_time_limit(600);
$api_v3 = new MC4WP_API_V3($options['api_key']);
$map    = [];

foreach ($lists as $list) {
    // cast to stdClass because of missing classes
    $list = (object) (array) $list;

    // no groupings? easy!
    if (empty($list->groupings)) {
        continue;
    }

    // fetch (new) interest categories for this list
    try {
        $interest_categories = $api_v3->get_list_interest_categories($list->id);
    } catch (MC4WP_API_Exception $e) {
        continue;
    }


    foreach ($interest_categories as $interest_category) {
        // compare interest title with grouping name, if it matches, get new id.
        $grouping = _mc4wp_400_find_grouping_for_interest_category($list->groupings, $interest_category);
        if (! $grouping) {
            continue;
        }

        $groups = [];

        try {
            $interests = $api_v3->get_list_interest_category_interests($list->id, $interest_category->id);
        } catch (MC4WP_API_Exception $e) {
            continue;
        }

        foreach ($interests as $interest) {
            $group = _mc4wp_400_find_group_for_interest($grouping->groups, $interest);

            if ($group) {
                $groups[ $group->id ]   = $interest->id;
                $groups[ $group->name ] = $interest->id;
            }
        }

        $map[ (string) $grouping->id ] = [
            'id'     => $interest_category->id,
            'groups' => $groups,
        ];
    }
}


if (! empty($map)) {
    update_option('mc4wp_groupings_map', $map);
}
