<?php
defined('ABSPATH') || exit;

trait AKSRT_DB_Migrator_Part_1 {

    private static function migrate_resource_pay_meta_post(int $post_id): void {
        $post = get_post($post_id);
        if (!($post instanceof WP_Post)) {
            return;
        }

        $all_meta = get_post_meta($post_id);
        if (!is_array($all_meta)) {
            $all_meta = [];
        }

        $canonical_meta = self::meta_value($all_meta, AKSRT_Domain_Model::PAY_META_KEY);
        if (!is_array($canonical_meta)) {
            $canonical_meta = [];
        }

        $legacy_downloads = self::meta_value($all_meta, '_aksrt_res_downloads');
        if (!is_array($legacy_downloads)) {
            $legacy_downloads = [];
        }

        $raw_pay_type = self::first_non_empty_string([
            $canonical_meta['pay_type'] ?? '',
            self::meta_value($all_meta, AKSRT_Domain_Model::PAY_TYPE_KEY),
            self::meta_value($all_meta, '_aksrt_res_pay_type'),
        ]);

        $has_resource_marker = self::first_boolean([
            self::meta_value($all_meta, AKSRT_Domain_Model::RESOURCE_MARKER_KEY),
            $post->post_type === 'aksrt_resource',
            !empty($legacy_downloads),
        ]);

        if ($raw_pay_type === '' && $has_resource_marker) {
            $raw_pay_type = AKSRT_Domain_Model::PAY_TYPE_DOWNLOAD;
        }

        $pay_meta = AKSRT_Domain_Model::sanitize_pay_meta([
            'pay_type'        => $raw_pay_type,
            'price'           => self::first_numeric([
                $canonical_meta['price'] ?? null,
                self::meta_value($all_meta, AKSRT_Domain_Model::PAY_PRICE_KEY),
                self::meta_value($all_meta, '_aksrt_res_price'),
            ]),
            'original_price'  => self::first_numeric([
                $canonical_meta['original_price'] ?? null,
                self::meta_value($all_meta, '_aksrt_res_original_price'),
            ]),
            'vip1_price'      => self::first_numeric([
                $canonical_meta['vip1_price'] ?? null,
                self::meta_value($all_meta, '_aksrt_res_vip1_price'),
            ]),
            'vip2_price'      => self::first_numeric([
                $canonical_meta['vip2_price'] ?? null,
                self::meta_value($all_meta, '_aksrt_res_vip2_price'),
            ]),
            'version'         => self::first_non_empty_string([
                $canonical_meta['version'] ?? '',
                self::meta_value($all_meta, '_aksrt_res_version'),
            ]),
            'size'            => self::first_non_empty_string([
                $canonical_meta['size'] ?? '',
                self::meta_value($all_meta, '_aksrt_res_size'),
            ]),
            'license'         => self::first_non_empty_string([
                $canonical_meta['license'] ?? '',
                self::meta_value($all_meta, '_aksrt_res_license'),
            ]),
            'compat'          => self::first_non_empty_string([
                $canonical_meta['compat'] ?? '',
                self::meta_value($all_meta, '_aksrt_res_compat'),
            ]),
            'demo_url'        => self::first_non_empty_string([
                $canonical_meta['demo_url'] ?? '',
                self::meta_value($all_meta, '_aksrt_res_demo_url'),
            ]),
            'video_url'       => self::first_non_empty_string([
                $canonical_meta['video_url'] ?? '',
            ]),
            'downloads'       => self::first_array([
                $canonical_meta['downloads'] ?? [],
                $legacy_downloads,
            ]),
            'attributes'      => self::first_array([
                $canonical_meta['attributes'] ?? [],
            ]),
            'gallery'         => self::first_array([
                $canonical_meta['gallery'] ?? [],
            ]),
            'require_login'   => self::first_boolean([
                $canonical_meta['require_login'] ?? null,
                self::meta_value($all_meta, '_aksrt_res_require_login'),
            ]),
            'require_captcha' => self::first_boolean([
                $canonical_meta['require_captcha'] ?? null,
                self::meta_value($all_meta, '_aksrt_res_require_captcha'),
            ]),
        ]);

        if ($pay_meta['pay_type'] === AKSRT_Domain_Model::PAY_TYPE_NO && $has_resource_marker) {
            $pay_meta['pay_type'] = AKSRT_Domain_Model::PAY_TYPE_DOWNLOAD;
        }

        $pay_meta = AKSRT_Domain_Model::sanitize_pay_meta($pay_meta);

        update_post_meta($post_id, AKSRT_Domain_Model::PAY_META_KEY, $pay_meta);
        update_post_meta($post_id, AKSRT_Domain_Model::PAY_TYPE_KEY, (string) $pay_meta['pay_type']);
        update_post_meta($post_id, AKSRT_Domain_Model::PAY_PRICE_KEY, (float) $pay_meta['price']);
        update_post_meta(
            $post_id,
            AKSRT_Domain_Model::RESOURCE_MARKER_KEY,
            AKSRT_Domain_Model::is_resource_pay_type((string) $pay_meta['pay_type']) ? 1 : 0
        );

        clean_post_cache($post_id);
    }

    /**
     * @param array<string, array<int, mixed>> $all_meta
     * @return mixed
     */
    private static function meta_value(array $all_meta, string $key) {
        if (!isset($all_meta[$key][0])) {
            return null;
        }

        return maybe_unserialize($all_meta[$key][0]);
    }

    /**
     * @param array<int, mixed> $candidates
     */
    private static function first_non_empty_string(array $candidates): string {
        foreach ($candidates as $candidate) {
            if (is_array($candidate)) {
                continue;
            }

            $value = trim((string) $candidate);
            if ($value !== '') {
                return $value;
            }
        }

        return '';
    }

    /**
     * @param array<int, mixed> $candidates
     */
    private static function first_numeric(array $candidates): float {
        foreach ($candidates as $candidate) {
            if ($candidate === null || $candidate === '') {
                continue;
            }

            if (is_numeric($candidate)) {
                return (float) $candidate;
            }
        }

        return 0.0;
    }

    /**
     * @param array<int, mixed> $candidates
     */
    private static function first_boolean(array $candidates): bool {
        foreach ($candidates as $candidate) {
            if ($candidate === null || $candidate === '') {
                continue;
            }

            return !empty($candidate);
        }

        return false;
    }

    /**
     * @param array<int, mixed> $candidates
     * @return array<int|string, mixed>
     */
    private static function first_array(array $candidates): array {
        foreach ($candidates as $candidate) {
            if (is_array($candidate) && !empty($candidate)) {
                return $candidate;
            }
        }

        return [];
    }
}