<?php
require_once __DIR__ . '/config.php';

class SquarePayment {
    private string $baseUrl;
    private string $token;

    public function __construct() {
        $this->token   = SQUARE_ACCESS_TOKEN;
        $this->baseUrl = SQUARE_ENV === 'production'
            ? 'https://connect.squareup.com/v2'
            : 'https://connect.squareupsandbox.com/v2';
    }

    public function charge(
        string $sourceId,
        int    $amountCents,
        string $note          = '',
        string $cardholderName= '',
        array  $billingAddress= [],
        string $buyerEmail    = ''
    ): array {
        $body = [
            'idempotency_key' => uniqid('tg_', true),
            'source_id'       => $sourceId,
            'amount_money'    => ['amount' => $amountCents, 'currency' => 'USD'],
            'location_id'     => SQUARE_LOCATION_ID,
            'note'            => $note ?: 'TomGames Token Purchase',
            'autocomplete'    => true,
        ];

        if ($cardholderName) {
            $body['buyer_email_address'] = $buyerEmail ?: null;
        }
        if (!empty($billingAddress)) {
            $body['billing_address'] = array_filter($billingAddress);
        }
        if ($buyerEmail && filter_var($buyerEmail, FILTER_VALIDATE_EMAIL)) {
            $body['buyer_email_address'] = $buyerEmail;
            $body['receipt_email']       = $buyerEmail;
        }

        $ch = curl_init($this->baseUrl . '/payments');
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT        => 30,
            CURLOPT_HTTPHEADER     => [
                'Content-Type: application/json',
                'Authorization: Bearer ' . $this->token,
                'Square-Version: 2024-01-18',
            ],
            CURLOPT_POSTFIELDS => json_encode(array_filter($body, fn($v) => $v !== null)),
        ]);

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $curlErr  = curl_error($ch);
        curl_close($ch);

        if ($curlErr) return ['success'=>false,'error'=>'Connection error. Please try again.'];

        $data = json_decode($response, true);

        if ($httpCode === 200 && isset($data['payment']['id'])) {
            return [
                'success'    => true,
                'payment_id' => $data['payment']['id'],
                'status'     => $data['payment']['status'],
                'receipt_url'=> $data['payment']['receipt_url'] ?? null,
                'card_brand' => $data['payment']['card_details']['card']['card_brand'] ?? null,
                'last_4'     => $data['payment']['card_details']['card']['last_4'] ?? null,
            ];
        }

        $errorMsg = $data['errors'][0]['detail'] ?? ($data['errors'][0]['code'] ?? 'Payment failed. Please try again.');
        return ['success'=>false,'error'=>$errorMsg];
    }

    public static function sdkUrl(): string {
        return SQUARE_ENV === 'production'
            ? 'https://web.squarecdn.com/v1/square.js'
            : 'https://sandbox.web.squarecdn.com/v1/square.js';
    }

    // Generic POST for Square APIs (gift cards, etc.)
    public static function post(string $path, array $body): array {
        $baseUrl = SQUARE_ENV === 'production'
            ? 'https://connect.squareup.com'
            : 'https://connect.squareupsandbox.com';
        $url = $baseUrl . $path;
        $ch  = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => json_encode($body),
            CURLOPT_HTTPHEADER     => [
                'Content-Type: application/json',
                'Square-Version: 2024-01-18',
                'Authorization: Bearer ' . SQUARE_ACCESS_TOKEN,
            ],
            CURLOPT_TIMEOUT => 30,
        ]);
        $resp    = curl_exec($ch);
        $httpCode= curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $err     = curl_error($ch);
        curl_close($ch);
        if ($err) throw new Exception('Square connection error: ' . $err);
        $data = json_decode($resp, true);
        if (isset($data['errors'])) {
            throw new Exception($data['errors'][0]['detail'] ?? 'Square API error');
        }
        return $data;
    }
}