const crypto=require("crypto"),db=require("../../models"),money=require("../pricing/money"),inventory=require("../inventory/inventory.service"),state=require("./orderState.service"),{nextSequence,pad}=require("../../utils/referenceNumber.util"),payhere=require("./providers/payhere.provider");const fault=(m,c,s=400)=>Object.assign(new Error(m),{code:c,status:s});const adapters={PAYHERE:payhere};
async function create({orderId,userId,provider="PAYHERE",method="ONLINE"}){if(!adapters[provider])throw fault("Payment provider is unavailable","PROVIDER_NOT_CONFIGURED",503);return db.sequelize.transaction(async transaction=>{const order=await db.Order.findOne({where:{id:orderId,user_id:userId,status:"PENDING_PAYMENT"},transaction,lock:transaction.LOCK.UPDATE});if(!order)throw fault("Payable order not found","NOT_FOUND",404);let payment=await db.Payment.findOne({where:{order_id:order.id,status:["PENDING","REQUIRES_ACTION"]},transaction,lock:transaction.LOCK.UPDATE});if(payment)return payment;payment=await db.Payment.create({id:crypto.randomUUID(),order_id:order.id,payment_reference:order.order_number,provider,method,status:"PENDING",currency:order.currency,amount:order.grand_total},{transaction});await db.PaymentAttempt.create({id:crypto.randomUUID(),payment_id:payment.id,attempt_number:1,provider_request_id:crypto.randomUUID(),status:"STARTED",amount:payment.amount,started_at:new Date(),metadata:{provider}},{transaction});return payment;});}
async function redeemCoupon(order,transaction){if(!order.coupon_code)return;const coupon=await db.Coupon.findOne({where:{code:order.coupon_code},transaction,lock:transaction.LOCK.UPDATE});if(!coupon)return;const used=await db.CouponRedemption.count({where:{coupon_id:coupon.id},transaction});if(coupon.max_uses&&used>=coupon.max_uses)throw fault("Coupon usage limit reached","COUPON_LIMIT_REACHED",409);await db.CouponRedemption.findOrCreate({where:{coupon_id:coupon.id,order_id:order.id},defaults:{id:crypto.randomUUID(),user_id:order.user_id,redeemed_at:new Date()},transaction});}
async function issueInvoice(order,transaction){const existing=await db.Invoice.findOne({where:{order_id:order.id},transaction,lock:transaction.LOCK.UPDATE});if(existing)return existing;const n=await nextSequence("invoices",transaction);return db.Invoice.create({id:crypto.randomUUID(),invoice_number:`INV-${new Date().getUTCFullYear()}-${pad(n,6)}`,order_id:order.id,status:"ISSUED",currency:order.currency,subtotal:order.subtotal,discount_total:order.discount_total,shipping_amount:order.shipping_amount,tax_amount:order.tax_amount,duty_amount:order.duty_amount,grand_total:order.grand_total,issued_at:new Date(),paid_at:new Date()},{transaction});}
async function handleWebhook(provider,payload){const adapter=adapters[provider];if(!adapter||!adapter.verifyWebhook(payload))throw fault("Invalid webhook signature","INVALID_WEBHOOK_SIGNATURE",401);const event=adapter.parseWebhook(payload),hash=crypto.createHash("sha256").update(JSON.stringify(payload)).digest("hex");return db.sequelize.transaction(async transaction=>{let record=await db.PaymentWebhookEvent.findOne({where:{provider,provider_event_id:event.eventId},transaction,lock:transaction.LOCK.UPDATE});if(record?.processing_status==="PROCESSED")return{idempotent:true,status:"PROCESSED"};if(!record)record=await db.PaymentWebhookEvent.create({id:crypto.randomUUID(),provider,provider_event_id:event.eventId,event_type:event.eventType,payload_hash:hash,processing_status:"RECEIVED",received_at:new Date()},{transaction});const payment=await db.Payment.findOne({where:{payment_reference:event.paymentReference,provider},transaction,lock:transaction.LOCK.UPDATE});if(!payment)throw fault("Payment not found","PAYMENT_NOT_FOUND",404);if(payment.currency!==event.currency||money.parse(payment.amount)!==money.parse(event.amount))throw fault("Payment amount or currency mismatch","PAYMENT_MISMATCH",409);const order=await db.Order.findByPk(payment.order_id,{include:[{model:db.OrderItem,as:"items"}],transaction,lock:transaction.LOCK.UPDATE});if(event.status==="PAID"&&payment.status!=="PAID"){state.assertTransition(order.status,"PAID");for(const item of [...order.items].sort((a,b)=>a.variant_id.localeCompare(b.variant_id)))await inventory.consumeReservation({reservationKey:item.reservation_key,requestId:`webhook:${record.id}`,transaction});await redeemCoupon(order,transaction);await payment.update({status:"PAID",provider_transaction_id:event.providerTransactionId,paid_at:new Date()},{transaction});await order.update({status:"PAID",payment_status:"PAID"},{transaction});await issueInvoice(order,transaction);}else if(event.status==="FAILED"&&payment.status!=="PAID"){await payment.update({status:"FAILED",failed_at:new Date(),failure_code:event.eventType},{transaction});await order.update({payment_status:"FAILED"},{transaction});}await record.update({processing_status:"PROCESSED",processed_at:new Date()},{transaction});return{idempotent:false,status:event.status,paymentId:payment.id};});}
module.exports={create,handleWebhook,redeemCoupon,issueInvoice,adapters};