<?php
namespace WPCOM\Member\Payments;

defined('ABSPATH') || exit;

class Wallet_Woo extends \WC_Payment_Gateway {
    public function __construct() {
        $this->id = 'wallet';
        $this->has_fields = false;

        $this->form_fields = [
            'enabled' => array(
                'title' => '启用/禁用',
                'type' => 'checkbox',
                'label' => '启用余额付款',
                'default' => 'no'
            ),
            'title' => array(
                'title' => '标题',
                'type' => 'text',
                'description' => '顾客支付的时候会看到关于该支付方式的说明',
                'default' => '余额支付',
                'css' => 'width:400px'
            ),
            'description' => array(
                'title' => '描述',
                'type' => 'textarea',
                'description' => '顾客在你网站上看到的付款方式描述',
                'css' => 'width:400px'
            ),
        ];

        $this->init_settings();

        $this->method_title = '钱包余额支付';
        $this->method_description = '使用钱包余额进行支付';

        $this->title = $this->get_option('title');
        $this->description = $this->get_option('description');
        $this->order_button_text = '余额支付下单';
        array_push($this->supports, 'refunds');

        add_action('woocommerce_receipt_' . $this->id, array($this, 'receipt_page'));
        add_action('wp_ajax_wpcom_wallet_woo_pay', array($this, 'paynow'));
        add_action('wp_ajax_nopriv_wpcom_wallet_woo_pay', array($this, 'paynow'));
        add_action('woocommerce_update_options_payment_gateways_' . $this->id, array($this, 'process_admin_options'));
        add_action('woocommerce_update_options_payment_gateways', array($this, 'process_admin_options'));
        add_filter('woocommerce_payment_gateways', array($this, 'add_gateway'));
    }

    function log($log, $level = 'debug') {
        $logger = wc_get_logger();
        $context = array('source' => $this->id);
        $logger->log($level, $log, $context);
    }

    function add_gateway($methods) {
        $methods[] = $this;
        return $methods;
    }

    public function process_payment($order_id) {
        $order = new \WC_Order($order_id);
        return array(
            'result' => 'success',
            'redirect' => $order->get_checkout_payment_url(true)
        );
    }

    public function process_refund($order_id, $amount = null, $reason = '') {
        $order = new \WC_Order($order_id);
        if (!$order) return new \WP_Error('invalid_order', '错误的订单');

        $trade_no = $order->get_transaction_id();
        $order_no = $order->get_order_number();
        if (empty($trade_no)) {
            return new \WP_Error('invalid_order', '未找到支付交易号或订单未支付');
        }

        $this->log('#' . $order_id . ' 余额发起退款，订单号：' . $order_no . '；退款金额：' . $amount);

        $total = $order->get_total();

        if ($amount <= 0 || $amount > $total) {
            return new \WP_Error('invalid_order', '退款金额错误');
        }

        $title = '[退款]#' . $order_no . '：' . ($reason ? $reason : '余额支付退款');

        if (\WPCOM\Member\Wallet::use_balance($amount, $order->get_user_id(), $title)) {
            $this->log('#' . $order_id . ' 余额退款成功；退款金额：' . $amount);
        } else {
            $this->log('#' . $order_id . ' 余额退款失败');
            throw new \Exception("余额退款失败");
        }

        return true;
    }

    public function receipt_page($order_id) {
        $order = new \WC_Order($order_id);
        if (!$order || $order->is_paid()) return;
        $user = wp_get_current_user();
        if ($user && isset($user->ID) && $user->ID) {
            $balance = $this->get_balance();
            if (is_numeric($balance)) {
                $price = $order->get_total();
                if (is_numeric($price) && $price > 0) {
                    if ($balance >= $price) { ?>
                        <div class="text-center" style="color: #666;font-size: 16px;line-height: 1;">可用余额<span style="display: block;margin-top: 6px;font-size: 28px;font-weight:600;color: #f76142;">￥<?php echo $balance; ?></span></div>
                        <div class="text-center" style="margin-top: 1em;"><button type="button" class="btn btn-primary btn-view btn-pay">立即支付</button></div>
                        <script>
                            _ajax_url = "<?php echo admin_url('admin-ajax.php'); ?>";
                            _nonce = "<?php echo wp_create_nonce('wpcom_wallet_receipt_page'); ?>";
                            jQuery(function($) {
                                $(document.body).on('click', '.btn-view.btn-pay', function() {
                                    var $btn = $(this);
                                    if ($btn.hasClass('loading')) return false;
                                    $btn.addClass('loading').html('支付中，请稍候...');
                                    jQuery.ajax({
                                        type: 'POST',
                                        url: _ajax_url,
                                        dataType: 'json',
                                        data: {
                                            order_id: <?php echo $order_id; ?>,
                                            action: 'wpcom_wallet_woo_pay',
                                            nonce: _nonce
                                        }
                                    }).done(function(data) {
                                        if (data && data.redirect) {
                                            location.href = data.redirect;
                                        } else {
                                            $btn.removeClass('loading').html('立即支付');
                                            wpcom_notice('支付异常，请稍候再试或者联系管理员获取帮助', 'error');
                                        }
                                    });
                                });
                            })
                        </script>
<?php } else {
                        $wallet_url = wpcom_subpage_url('wallet');
                        echo '<div class="text-center" style="color:#f66;"><p style="margin-bottom: .2em;">钱包余额不足！</p>请先充值或者使用用其他支付方式进行支付。</div><div class="text-center" style="margin-top:1em;"><a class="btn btn-primary btn-view" target="_blank" href="' . esc_url($wallet_url) . '">进入我的钱包充值 <i class="wi wpcom-icon"><svg class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5742" width="128" height="128"><path d="M690.005333 469.333333l-228.864-228.864 60.330667-60.330666L853.333333 512l-331.861333 331.861333-60.330667-60.330666L690.005333 554.666667H170.666667v-85.333334z" p-id="5743"></path></svg></i></a></div>';
                    }
                } else {
                    echo '<div class="text-center" style="color:#f66;">订单价格异常</div>';
                }
            } else {
                echo '<div class="text-center" style="color:#f66;">余额获取失败</div>';
            }
        } else {
            echo '<div class="text-center" style="color:#f66;">请登录后再试</div>';
        }
    }

    public function get_order_title($order) {
        $id = $order->get_order_number();
        $title = get_option('blogname');
        $order_items = $order->get_items();
        if ($order_items && count($order_items) > 0) {
            $title = "#{$id} ";
            $index = 0;
            foreach ($order_items as $item_id => $item) {
                if ($index > 0) $title .= '; ';
                $title .= $item['name'];
                $index++;
            }
        }
        /**
         * 用于自定义商品支付订单标题
         * @param string $title 标题
         * @param object $order 订单信息
         * @param string $this->id 使用的支付接口标识
         */
        $title = apply_filters('wpcom_woo_payment_title', $title, $order, $this->id);
        if (strlen($title) >= 127) {
            if (function_exists('mb_strcut')) {
                $title = mb_strcut($title, 0, 123, 'UTF-8') . '…';
            } else {
                // 降级方案：使用正则粗略处理 UTF-8 字符
                $truncated = preg_replace('/^(.{0,123})[\s\S]*/u', '$1', $title);
                $title = $truncated . '…';
            }
        }
        return $title;
    }

    function get_balance() {
        $user = wp_get_current_user();
        if ($user && isset($user->ID) && $user->ID) {
            $balance = get_user_option('_wpcom_balance', $user->ID);
            if ($balance === '' || $balance === false) $balance = '0.00';
            return $balance;
        }
    }

    function paynow() {
        $res = array('result' => -1);
        $order_id = isset($_POST['order_id']) && $_POST['order_id'] ? $_POST['order_id'] : '';
        $nonce = isset($_POST['nonce']) && $_POST['nonce'] ? $_POST['nonce'] : '';
        if ($nonce && wp_verify_nonce($nonce, 'wpcom_wallet_receipt_page')) {
            $order = $order_id ? new \WC_Order($order_id) : '';
            $user_id = get_current_user_id();
            if ($order && $order->get_id()) {
                $res['redirect'] = $order->get_checkout_order_received_url();
                self::log('#' . $order->get_id() . ' 提交余额支付请求', $this->id);
            }
            if ($user_id && $order && $order->get_id() && (int) $order->get_user_id() === $user_id) {
                $order_number = $order->get_order_number();
                $balance = $this->get_balance();
                if (is_numeric($balance)) {
                    $price = $order->get_total();
                    if (is_numeric($price) && $price > 0 && $balance >= $price && $order->needs_payment()) {
                        $title = $this->get_order_title($order);
                        $use_balance = \WPCOM\Member\Wallet::use_balance(- ($price), $user_id, $title);
                        if ($use_balance) {
                            $res['result'] = 0;
                            $order->payment_complete($order_number);
                            self::log('#' . $order_number . ' 订单支付完成！', $this->id);
                        }
                    }
                }
            }
        }
        wp_send_json($res);
    }
}