<?php

/**
 * Decodes and stores the Afileasy connection key.
 */

namespace Afileasy\WooCommerce;

if (! defined('ABSPATH')) {
    exit;
}

/**
 * The connection key is an opaque `afl_<base64url(json)>` string the merchant
 * copies from the Afileasy dashboard. It bundles everything the plugin needs:
 *
 *   k → integration token (uuid)        : webhook URL path token
 *   s → webhook auth token (secret)     : sent in the X-Afileasy-Token header
 *   o → organization public key         : the tracking script's data-afileasy id
 *   u → Afileasy application URL        : the base older keys build their URLs from
 *   t → tracking script URL             : the afileasy-script.js embedded on the storefront
 *   w → order events endpoint (optional): where order events are POSTed
 *   l → lead endpoint (optional)        : where referred sign-ups are registered
 *   a → API base URL (optional)         : handed to the script as data-api-url
 */
class Connection
{
    /**
     * Decode a raw connection key into its parts, or null when malformed.
     *
     * @return array<string, string>|null
     */
    public static function decode(string $key): ?array
    {
        $key = trim($key);

        if (strpos($key, 'afl_') !== 0) {
            return null;
        }

        $json = base64_decode(strtr(substr($key, 4), '-_', '+/'), true);
        if ($json === false) {
            return null;
        }

        $data = json_decode($json, true);
        if (! is_array($data)) {
            return null;
        }

        foreach (['k', 's', 'o', 'u', 't'] as $field) {
            if (empty($data[$field]) || ! is_string($data[$field])) {
                return null;
            }
        }

        $connection = [
            'k' => $data['k'],
            's' => $data['s'],
            'o' => $data['o'],
            'u' => rtrim($data['u'], '/'),
            't' => $data['t'],
        ];

        foreach (['w', 'l', 'a'] as $field) {
            if (! empty($data[$field]) && is_string($data[$field])) {
                $connection[$field] = rtrim($data[$field], '/');
            }
        }

        return $connection;
    }

    /**
     * Return the stored connection, or null when not connected.
     *
     * @return array<string, string>|null
     */
    public static function get(): ?array
    {
        $stored = get_option(AFILEASY_WC_OPTION);

        return is_array($stored) && ! empty($stored['k']) ? $stored : null;
    }

    /**
     * Persist a decoded connection (or clear it with null).
     *
     * @param  array<string, string>|null  $connection
     */
    public static function store(?array $connection): void
    {
        if ($connection === null) {
            delete_option(AFILEASY_WC_OPTION);

            return;
        }

        update_option(AFILEASY_WC_OPTION, $connection, false);
    }
    public static function webhookUrl(array $connection): string
    {
        if (! empty($connection['w'])) {
            return $connection['w'];
        }

        return $connection['u'].'/webhook/woocommerce/'.rawurlencode($connection['k']);
    }

    public static function leadUrl(array $connection): string
    {
        if (! empty($connection['l'])) {
            return $connection['l'];
        }

        return $connection['u'].'/api/track/lead';
    }
}