<?php
require_once __DIR__ . '/../helpers.php';
require_once __DIR__ . '/../config/stripe.php';
// NO runAuth() — webhook is called by Stripe, not a user

try {
    $payload = file_get_contents('php://input');
    $sigHeader = $_SERVER['HTTP_STRIPE_SIGNATURE'] ?? '';
    $config = getStripeConfig();
    $webhookSecret = $config['webhookSecret'];

    // Verify webhook signature (Stripe HMAC-SHA256)
    if (!empty($webhookSecret) && !empty($sigHeader)) {
        $sigParts = [];
        foreach (explode(',', $sigHeader) as $part) {
            $kv = explode('=', trim($part), 2);
            if (count($kv) === 2) $sigParts[$kv[0]] = $kv[1];
        }

        $sigTimestamp = $sigParts['t'] ?? '';
        $sigV1 = $sigParts['v1'] ?? '';

        if (empty($sigTimestamp) || empty($sigV1)) {
            jsonResponse(['OK' => false, 'ERROR' => 'invalid_signature']);
        }

        // Check timestamp tolerance (5 minutes)
        if (abs(time() - (int) $sigTimestamp) > 300) {
            jsonResponse(['OK' => false, 'ERROR' => 'timestamp_expired']);
        }

        $signedPayload = $sigTimestamp . '.' . $payload;
        $expectedSig = hash_hmac('sha256', $signedPayload, $webhookSecret);

        if (!hash_equals($expectedSig, strtolower($sigV1))) {
            jsonResponse(['OK' => false, 'ERROR' => 'signature_mismatch']);
        }
    }

    $event = json_decode($payload, true);
    $eventType = $event['type'] ?? '';
    $eventData = $event['data']['object'] ?? [];

    switch ($eventType) {

        case 'payment_intent.succeeded':
            $paymentIntentID = $eventData['id'];
            $orderID = (int) ($eventData['metadata']['order_id'] ?? 0);
            $metaType = $eventData['metadata']['type'] ?? '';

            // === TAB CLOSE CAPTURE ===
            if ($metaType === 'tab_close') {
                $tabID = (int) ($eventData['metadata']['tab_id'] ?? 0);
                if ($tabID > 0) {
                    queryTimed("
                        UPDATE Tabs SET StatusID = 3, PaymentStatus = 'captured', CapturedOn = NOW(), ClosedOn = NOW()
                        WHERE ID = ? AND StatusID = 2
                    ", [$tabID]);

                    $qTabOrders = queryTimed("SELECT OrderID FROM TabOrders WHERE TabID = ? AND ApprovalStatus = 'approved'", [$tabID]);
                    foreach ($qTabOrders as $row) {
                        queryTimed("UPDATE Orders SET PaymentStatus = 'paid', PaymentCompletedOn = NOW() WHERE ID = ?", [$row['OrderID']]);
                    }
                }
                break;
            }

            if ($orderID > 0) {
                // Mark order as paid
                queryTimed("
                    UPDATE Orders
                    SET PaymentStatus = 'paid', PaymentCompletedOn = NOW(),
                        SubmittedOn = COALESCE(SubmittedOn, NOW()),
                        StatusID = CASE WHEN StatusID = 0 THEN 1 ELSE StatusID END
                    WHERE ID = ?
                ", [$orderID]);

                // Deduct user balance if applied at checkout
                $qBalOrder = queryOne("SELECT BalanceApplied, UserID FROM Orders WHERE ID = ?", [$orderID]);
                if ($qBalOrder && (float) ($qBalOrder['BalanceApplied'] ?? 0) > 0) {
                    queryTimed("UPDATE Users SET Balance = GREATEST(Balance - ?, 0) WHERE ID = ?",
                        [(float) $qBalOrder['BalanceApplied'], (int) $qBalOrder['UserID']]);
                }

                // Create kitchen task
                $qOrder = queryOne("
                    SELECT o.BusinessID, o.ServicePointID, sp.Name AS ServicePointName
                    FROM Orders o
                    LEFT JOIN ServicePoints sp ON sp.ID = o.ServicePointID
                    WHERE o.ID = ?
                ", [$orderID]);

                if ($qOrder) {
                    $tableName = !empty(trim($qOrder['ServicePointName'] ?? '')) ? $qOrder['ServicePointName'] : 'Table';
                    $taskTitle = "Prepare Order #$orderID for $tableName";

                    queryTimed("
                        INSERT INTO Tasks (BusinessID, OrderID, ServicePointID, Title, CreatedOn, ClaimedByUserID)
                        VALUES (?, ?, ?, ?, NOW(), 0)
                    ", [$qOrder['BusinessID'], $orderID, (int) ($qOrder['ServicePointID'] ?? 0), $taskTitle]);
                }
            }

            // === WORKER PAYOUT TRANSFER ===
            try {
                $qLedger = queryOne("
                    SELECT ID, UserID, TaskID, NetTransferCents, StripeTransferID, Status
                    FROM WorkPayoutLedgers
                    WHERE StripePaymentIntentID = ? LIMIT 1
                ", [$paymentIntentID]);

                if ($qLedger && empty($qLedger['StripeTransferID']) && $qLedger['Status'] === 'pending_charge') {
                    queryTimed("UPDATE WorkPayoutLedgers SET Status = 'charged', UpdatedAt = NOW() WHERE ID = ?",
                        [$qLedger['ID']]);

                    $qWorker = queryOne("SELECT StripeConnectedAccountID FROM Users WHERE ID = ?", [$qLedger['UserID']]);
                    $workerAccountID = $qWorker['StripeConnectedAccountID'] ?? '';

                    if (!empty(trim($workerAccountID)) && (int) $qLedger['NetTransferCents'] > 0) {
                        $transferData = stripeRequest('POST', 'https://api.stripe.com/v1/transfers', [
                            'amount' => $qLedger['NetTransferCents'],
                            'currency' => 'usd',
                            'destination' => $workerAccountID,
                            'metadata[user_id]' => $qLedger['UserID'],
                            'metadata[task_id]' => $qLedger['TaskID'],
                            'metadata[ledger_id]' => $qLedger['ID'],
                            'metadata[activation_withheld_cents]' => 0,
                        ], ['Idempotency-Key' => 'transfer-ledger-' . $qLedger['ID']]);

                        if (isset($transferData['id'])) {
                            queryTimed("UPDATE WorkPayoutLedgers SET StripeTransferID = ?, Status = 'transferred', UpdatedAt = NOW() WHERE ID = ?",
                                [$transferData['id'], $qLedger['ID']]);
                        }
                    } elseif ((int) $qLedger['NetTransferCents'] === 0) {
                        queryTimed("UPDATE WorkPayoutLedgers SET Status = 'transferred', UpdatedAt = NOW() WHERE ID = ?",
                            [$qLedger['ID']]);
                    }
                }
            } catch (Exception $e) {
                // Non-fatal
            }

            // === SP-SM: GRANT OWNER TRANSFER ===
            try {
                $grantOwnerFeeCents = (int) ($eventData['metadata']['grant_owner_fee_cents'] ?? 0);
                $grantOwnerBizID = (int) ($eventData['metadata']['grant_owner_business_id'] ?? 0);
                $grantMetaID = (int) ($eventData['metadata']['grant_id'] ?? 0);

                if ($grantOwnerFeeCents > 0 && $grantOwnerBizID > 0) {
                    $qOwnerBiz = queryOne("SELECT StripeAccountID FROM Businesses WHERE ID = ?", [$grantOwnerBizID]);
                    $ownerStripeAcct = $qOwnerBiz['StripeAccountID'] ?? '';

                    if (!empty(trim($ownerStripeAcct))) {
                        stripeRequest('POST', 'https://api.stripe.com/v1/transfers', [
                            'amount' => $grantOwnerFeeCents,
                            'currency' => 'usd',
                            'destination' => $ownerStripeAcct,
                            'metadata[grant_id]' => $grantMetaID,
                            'metadata[order_id]' => $orderID,
                            'metadata[type]' => 'grant_owner_fee',
                        ], ['Idempotency-Key' => "grant-transfer-$orderID-$grantMetaID"]);
                    }
                }
            } catch (Exception $e) {
                // Non-fatal
            }
            break;

        case 'payment_intent.payment_failed':
            $orderID = (int) ($eventData['metadata']['order_id'] ?? 0);
            $failureMessage = $eventData['last_payment_error']['message'] ?? 'Payment failed';

            if ($orderID > 0) {
                queryTimed("UPDATE Orders SET PaymentStatus = 'failed', PaymentError = ? WHERE ID = ?",
                    [$failureMessage, $orderID]);
            }
            break;

        case 'charge.refunded':
            $paymentIntentID = $eventData['payment_intent'] ?? '';
            $refundAmount = ($eventData['amount_refunded'] ?? 0) / 100;

            if (!empty($paymentIntentID)) {
                queryTimed("
                    UPDATE Orders SET PaymentStatus = 'refunded', RefundAmount = ?, RefundedOn = NOW()
                    WHERE StripePaymentIntentID = ?
                ", [$refundAmount, $paymentIntentID]);
            }
            break;

        case 'charge.dispute.created':
            $paymentIntentID = $eventData['payment_intent'] ?? '';

            if (!empty($paymentIntentID)) {
                $qOrder = queryOne("SELECT ID, BusinessID FROM Orders WHERE StripePaymentIntentID = ?", [$paymentIntentID]);

                if ($qOrder) {
                    queryTimed("UPDATE Orders SET PaymentStatus = 'disputed' WHERE StripePaymentIntentID = ?",
                        [$paymentIntentID]);

                    queryTimed("
                        INSERT INTO Tasks (BusinessID, CategoryID, Title, Details, CreatedOn, StatusID, SourceType, SourceID)
                        VALUES (?, 4, 'Payment Dispute', ?, NOW(), 0, 'dispute', ?)
                    ", [
                        $qOrder['BusinessID'],
                        'Order #' . $qOrder['ID'] . ' has been disputed. Review immediately.',
                        $qOrder['ID'],
                    ]);
                }
            }
            break;

        case 'account.updated':
            $accountID = $eventData['id'];
            $chargesEnabled = $eventData['charges_enabled'] ?? false;
            $payoutsEnabled = $eventData['payouts_enabled'] ?? false;

            // Business accounts
            if ($chargesEnabled && $payoutsEnabled) {
                queryTimed("UPDATE Businesses SET StripeOnboardingComplete = 1 WHERE StripeAccountID = ?", [$accountID]);
            }

            // Worker accounts
            try {
                $qWorkerAcct = queryOne("SELECT ID FROM Users WHERE StripeConnectedAccountID = ? LIMIT 1", [$accountID]);
                if ($qWorkerAcct) {
                    queryTimed("UPDATE Users SET StripePayoutsEnabled = ? WHERE StripeConnectedAccountID = ?",
                        [$payoutsEnabled ? 1 : 0, $accountID]);
                }
            } catch (Exception $e) {
                // Non-fatal
            }
            break;

        case 'checkout.session.completed':
            try {
                $sessionMetadata = $eventData['metadata'] ?? [];
                $metaType = $sessionMetadata['type'] ?? '';
                $metaUserID = (int) ($sessionMetadata['user_id'] ?? 0);

                // Activation early unlock
                if ($metaType === 'activation_unlock' && $metaUserID > 0) {
                    queryTimed("UPDATE Users SET ActivationBalanceCents = ActivationCapCents WHERE ID = ?", [$metaUserID]);
                }

                // Tip payment
                if ($metaType === 'tip') {
                    $metaTipID = (int) ($sessionMetadata['tip_id'] ?? 0);
                    $metaWorkerID = (int) ($sessionMetadata['worker_user_id'] ?? 0);
                    $tipPaymentIntent = $eventData['payment_intent'] ?? '';

                    if ($metaTipID > 0) {
                        queryTimed("UPDATE Tips SET Status = 'paid', PaidOn = NOW(), StripePaymentIntentID = ? WHERE ID = ? AND Status = 'pending'",
                            [$tipPaymentIntent, $metaTipID]);

                        // Transfer tip to worker
                        if ($metaWorkerID > 0) {
                            $qTipWorker = queryOne("SELECT StripeConnectedAccountID FROM Users WHERE ID = ?", [$metaWorkerID]);
                            $tipWorkerAcct = $qTipWorker['StripeConnectedAccountID'] ?? '';

                            if (!empty(trim($tipWorkerAcct))) {
                                $qTipAmt = queryOne("SELECT AmountCents FROM Tips WHERE ID = ?", [$metaTipID]);

                                if ($qTipAmt && (int) $qTipAmt['AmountCents'] > 0) {
                                    $tipTransferData = stripeRequest('POST', 'https://api.stripe.com/v1/transfers', [
                                        'amount' => $qTipAmt['AmountCents'],
                                        'currency' => 'usd',
                                        'destination' => $tipWorkerAcct,
                                        'metadata[type]' => 'tip',
                                        'metadata[tip_id]' => $metaTipID,
                                        'metadata[worker_user_id]' => $metaWorkerID,
                                    ], ['Idempotency-Key' => "tip-transfer-$metaTipID"]);

                                    if (isset($tipTransferData['id'])) {
                                        queryTimed("UPDATE Tips SET Status = 'transferred', StripeTransferID = ? WHERE ID = ?",
                                            [$tipTransferData['id'], $metaTipID]);
                                    }
                                }
                            }
                        }
                    }
                }
            } catch (Exception $e) {
                // Non-fatal
            }
            break;
    }

    jsonResponse(['OK' => true, 'RECEIVED' => true]);

} catch (Exception $e) {
    jsonResponse(['OK' => false, 'ERROR' => $e->getMessage()]);
}