/*
Plugin: Crypto QR Pay (Complete rewrite per user request)
Structure (single-file bundle for easy install):
- crypto-qr-pay.php (this file) contains all code sections separated by comments

Instructions: save this file as wp-content/plugins/crypto-qr-pay/crypto-qr-pay.php and create folders:
- wp-content/plugins/crypto-qr-pay/assets/js/checkout.js  (content provided below)
- wp-content/plugins/crypto-qr-pay/assets/css/style.css (content provided below)

Activate plugin in WP admin. Then go to WooCommerce -> Crypto QR Pay to configure ETH wallet (backend wallet), USDT contract, Etherscan API key, store logo/title/description/support url.

------ MAIN PLUGIN (this file defines constants and includes) ------

------ assets/js/checkout.js (place in assets/js/checkout.js) ------
// content for assets/js/checkout.js
jQuery(function($){
    // Only run on order-pay page which includes #cryptoqr_checkout
    if (!$('#cryptoqr_checkout').length) return;

    // get order id from URL
    const m = location.href.match(/order-pay\/(\d+)/);
    if (!m || !m[1]) return;
    const orderId = m[1];
    const payUrl = location.href;

    // show logo/title/desc from cryptoqr_vars
    if (cryptoqr_vars.logo) {
        const img = '<img src="'+cryptoqr_vars.logo+'" class="cryptoqr-big-logo" />';
        $('#cryptoqr_checkout .cryptoqr-header').remove();
        $('#cryptoqr_checkout').prepend('<div class="cryptoqr-header">'+img+'<h2>'+cryptoqr_vars.title+'</h2><p>'+cryptoqr_vars.description+'</p></div>');
    }

    // generate QR
    function generateQR(){
        $('#cryptoqr_status').text('生成二维码...');
        $.post(cryptoqr_vars.ajax_url, { action:'cryptoqr_get_qr', order_id:orderId }, function(resp){
            if(!resp || !resp.success){ $('#cryptoqr_status').text('生成失败'); return; }
            $('#cryptoqr_qr_area').html('<img src="'+resp.data.qr+'" style="max-width:320px;"/>');
            $('#cryptoqr_unique_amount').text('请支付: '+resp.data.unique+' USDT');
            $('#cryptoqr_paid_btn').show();
            $('#cryptoqr_status').text('扫码支付后点击我已支付开始验证（最多 3 分钟）');
        });
    }

    generateQR();

    $('#cryptoqr_paid_btn').on('click', function(){
        let attempts = 0; const max = 36;
        $('#cryptoqr_status').text('开始监听支付状态...');
        const iv = setInterval(function(){
            attempts++;
            $('#cryptoqr_status').text('检查支付状态... ('+attempts+'/'+max+')');
            $.post(cryptoqr_vars.ajax_url, { action:'cryptoqr_check_status', order_id:orderId }, function(res){
                if(res && res.success && res.data.paid){
                    clearInterval(iv);
                    $('#cryptoqr_status').html('支付成功，跳转中...');
                    setTimeout(function(){
                        // derive thankyou URL by replacing order-pay with order-received
                        const thank = payUrl.replace('/order-pay/','/order-received/');
                        window.location.href = thank;
                    },1200);
                }
            });
            if(attempts>=max){
                clearInterval(iv);
                // show manual input
                $('#cryptoqr_status').html('<div>3 分钟未检测到交易，请输入交易哈希：<input id="cryptoqr_manual_tx"/> <button id="cryptoqr_manual_submit">再次检测</button> <button id="cryptoqr_support">联系客服</button></div>');
                $('#cryptoqr_support').on('click', function(){ window.open(cryptoqr_vars.support_link || '#','_blank'); });
                $('#cryptoqr_manual_submit').on('click', function(){
                    const tx = $('#cryptoqr_manual_tx').val().trim();
                    if(!tx){ alert('请输入 tx'); return; }
                    $.post(cryptoqr_vars.ajax_url, { action:'cryptoqr_verify_hash', order_id:orderId, tx_hash:tx }, function(r){
                        if(!r || !r.success){ alert('提交失败'); return; }
                        alert('已提交，稍后系统会继续检查');
                    });
                });
            }
        },5000);
    });
});

------ assets/css/style.css (place in assets/css/style.css) ------
.cryptoqr-logo{ max-height:34px; vertical-align:middle; margin-right:8px; }
.cryptoqr-header{ display:flex; align-items:center; gap:12px; margin-bottom:12px; }
.cryptoqr-big-logo{ max-height:64px; margin-right:12px; }

/* minimal layout */
#cryptoqr_qr_area img{ border:1px solid #ddd; padding:6px; background:#fff; }


End of bundle. Follow the installation instructions at top to place files and activate.
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