<?php
/*
Plugin Name: Auto Create Wallets for Users
Description: Automatically creates Wallet CPTs (wallets) for new users and existing users in batches, with unique alphanumeric titles.
Version: 1.0
Author: Your Name
*/

// -------------------------------
// 1. Create wallet for new users
// -------------------------------
add_action('user_register', 'auto_create_wallet_for_user', 20, 1);
function auto_create_wallet_for_user($user_id) {
    create_wallet_if_not_exists($user_id);
}

// ---------------------------------------------------
// 2. Batch-create wallets for existing users safely
// ---------------------------------------------------
// Run only on admin init
add_action('admin_init', 'create_wallets_for_existing_users_batch');
function create_wallets_for_existing_users_batch() {

    // Run once per site load
    if (get_option('wallets_batch_done')) {
        return;
    }

    $batch_size = 50; // Number of users to process at once
    $offset = 0;

    do {
        $users = get_users([
            'number' => $batch_size,
            'offset' => $offset,
            'fields' => ['ID'],
        ]);

        if (empty($users)) {
            break;
        }

        foreach ($users as $user) {
            create_wallet_if_not_exists($user->ID);
        }

        $offset += $batch_size;
    } while (!empty($users));

    // Mark batch as done
    update_option('wallets_batch_done', 1);
}

// -----------------------------------------
// 3. Helper function to create wallet
// -----------------------------------------
function create_wallet_if_not_exists($user_id) {

    // Check if wallet exists
    $existing = get_posts([
        'post_type'  => 'wallets',
        'meta_key'   => 'user_id',
        'meta_value' => $user_id,
        'post_status'=> 'any',
        'numberposts'=> 1,
    ]);

    if (!empty($existing)) {
        return; // Wallet already exists
    }

    // Get user
    $user = get_userdata($user_id);
    $username = $user->display_name ?: $user->user_login;

    // Generate unique alphanumeric suffix (4 chars)
    $suffix = strtoupper(substr(md5(uniqid('', true)), 0, 4));

    // Create wallet CPT
    $wallet_id = wp_insert_post([
        'post_type'   => 'wallets',
        'post_status' => 'publish',
        'post_title'  => $username . ' Wallet-' . $suffix,
    ]);

    // Set default wallet values
    if ($wallet_id) {
        update_post_meta($wallet_id, 'user_id', $user_id);
        update_post_meta($wallet_id, 'available_balance', 0);
        update_post_meta($wallet_id, 'pending_balance', 0);
        update_post_meta($wallet_id, 'total_withdrawn', 0);
        update_post_meta($wallet_id, 'total_earned', 0);
        update_post_meta($wallet_id, 'created_at', current_time('mysql'));
        update_post_meta($wallet_id, 'updated_at', current_time('mysql'));
    }
}