<?php

namespace Plugin\Epay;

use App\Services\Plugin\AbstractPlugin;
use App\Contracts\PaymentInterface;
use App\Models\Order;

class Plugin extends AbstractPlugin implements PaymentInterface
{
    public function boot(): void
    {
        $this->filter('available_payment_methods', function ($methods) {
            if ($this->getConfig('enabled', true)) {
                $methods['EPay'] = [
                    'name' => $this->getConfig('display_name', '易支付'),
                    'icon' => $this->getConfig('icon', '💳'),
                    'plugin_code' => $this->getPluginCode(),
                    'type' => 'plugin'
                ];
            }
            return $methods;
        });
    }

    public function form(): array
    {
        return [
            'url' => [
                'label' => '支付网关地址',
                'type' => 'string',
                'required' => true,
                'description' => '请填写完整的支付网关地址，包括协议（http或https）'
            ],
            'pid' => [
                'label' => '商户ID',
                'type' => 'string',
                'description' => '请填写商户ID',
                'required' => true
            ],
            'key' => [
                'label' => '通信密钥',
                'type' => 'string',
                'required' => true,
                'description' => '请填写通信密钥'
            ],
            'type' => [
                'label' => '支付类型',
                'type' => 'string',
                'description' => '支付类型，如: alipay, wxpay, qqpay 等，可自定义'
            ],
        ];
    }

    public function pay($order): array
    {
        $params = [
            'money' => $order['total_amount'] / 100,
            'name' => $order['trade_no'],
            'notify_url' => $order['notify_url'],
            'return_url' => $order['return_url'],
            'out_trade_no' => $order['trade_no'],
            'pid' => $this->getConfig('pid')
        ];

        if ($paymentType = $this->getConfig('type')) {
            $params['type'] = $paymentType;
        }

        $params['sign'] = $this->signature($params);
        $params['sign_type'] = 'MD5';

        return [
            'type' => 1,
            'data' => rtrim($this->getConfig('url'), '/') . '/submit.php?' . http_build_query($params)
        ];
    }

    public function notify($params): array|bool
    {
        foreach ($params as $value) {
            if (!is_scalar($value) && $value !== null) {
                return false;
            }
        }
        if (!is_string($params['sign'] ?? null)
            || ($params['sign_type'] ?? 'MD5') !== 'MD5'
            || !hash_equals($this->signature($params), $params['sign'])
            || ($params['trade_status'] ?? null) !== 'TRADE_SUCCESS'
            || (string) ($params['pid'] ?? '') !== (string) $this->getConfig('pid')
            || ($this->getConfig('type') && ($params['type'] ?? null) !== $this->getConfig('type'))
            || empty($params['out_trade_no']) || empty($params['trade_no'])) {
            return false;
        }

        $order = $this->findOrder((string) $params['out_trade_no']);
        $amount = $this->amountInCents((string) ($params['money'] ?? ''));
        if (!$order || (int) $order->payment_id !== (int) $this->getConfig('id')
            || $amount === null || $amount !== (int) $order->total_amount + (int) $order->handling_amount
            || !in_array((int) $order->status, [Order::STATUS_PENDING, Order::STATUS_PROCESSING, Order::STATUS_COMPLETED], true)
            || ($order->callback_no && $order->callback_no !== (string) $params['trade_no'])) {
            return false;
        }

        return [
            'trade_no' => $params['out_trade_no'],
            'callback_no' => $params['trade_no']
        ];
    }

    protected function findOrder(string $tradeNo): ?Order
    {
        return Order::where('trade_no', $tradeNo)->first();
    }

    private function signature(array $params): string
    {
        unset($params['sign'], $params['sign_type']);
        $params = array_filter($params, static fn ($value) => $value !== '' && $value !== null);
        ksort($params, SORT_STRING);
        $parts = [];
        foreach ($params as $key => $value) {
            $parts[] = $key . '=' . $value;
        }
        return md5(implode('&', $parts) . $this->getConfig('key'));
    }

    private function amountInCents(string $amount): ?int
    {
        if (!preg_match('/\A([0-9]{1,10})(?:\.([0-9]{1,2}))?\z/', $amount, $matches)) {
            return null;
        }
        return (int) $matches[1] * 100 + (int) str_pad($matches[2] ?? '', 2, '0');
    }
}