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import { InjectRepository } from '@nestjs/typeorm';
import { Repository, LessThan } from 'typeorm';
import {
Subscription,
SubscriptionStatus,
} from '../entities/subscription.entity';
import { Invoice, InvoiceStatus } from '../entities/invoice.entity';
import { PaymentMethod } from '../entities/payment-method.entity';
import { CreateSubscriptionDto } from '../dto/create-subscription.dto';
import {
UpdateSubscriptionDto,
CancelSubscriptionDto,
} from '../dto/update-subscription.dto';
import { CreatePaymentMethodDto } from '../dto/create-payment-method.dto';
@Injectable()
export class BillingService {
constructor(
@InjectRepository(Subscription)
private readonly subscriptionRepo: Repository<Subscription>,
@InjectRepository(Invoice)
private readonly invoiceRepo: Repository<Invoice>,
@InjectRepository(PaymentMethod)
private readonly paymentMethodRepo: Repository<PaymentMethod>,
) {}
// ==================== Subscriptions ====================
async createSubscription(dto: CreateSubscriptionDto): Promise<Subscription> {
const now = new Date();
const periodEnd = new Date(now);
periodEnd.setMonth(periodEnd.getMonth() + 1);
const subscription = this.subscriptionRepo.create({
tenant_id: dto.tenant_id,
plan_id: dto.plan_id,
status: dto.trial_end ? SubscriptionStatus.TRIAL : SubscriptionStatus.ACTIVE,
current_period_start: now,
current_period_end: periodEnd,
trial_end: dto.trial_end ? new Date(dto.trial_end) : null,
payment_provider: dto.payment_provider,
});
return this.subscriptionRepo.save(subscription);
}
async getSubscription(tenantId: string): Promise<Subscription | null> {
return this.subscriptionRepo.findOne({
where: { tenant_id: tenantId },
order: { created_at: 'DESC' },
});
}
async updateSubscription(
tenantId: string,
dto: UpdateSubscriptionDto,
): Promise<Subscription> {
const subscription = await this.getSubscription(tenantId);
if (!subscription) {
throw new NotFoundException('Subscription not found');
}
Object.assign(subscription, dto);
return this.subscriptionRepo.save(subscription);
}
async cancelSubscription(
tenantId: string,
dto: CancelSubscriptionDto,
): Promise<Subscription> {
const subscription = await this.getSubscription(tenantId);
if (!subscription) {
throw new NotFoundException('Subscription not found');
}
subscription.cancelled_at = new Date();
if (dto.immediately) {
subscription.status = SubscriptionStatus.CANCELLED;
}
if (dto.reason) {
subscription.metadata = {
...subscription.metadata,
cancellation_reason: dto.reason,
};
}
return this.subscriptionRepo.save(subscription);
}
async changePlan(tenantId: string, newPlanId: string): Promise<Subscription> {
const subscription = await this.getSubscription(tenantId);
if (!subscription) {
throw new NotFoundException('Subscription not found');
}
subscription.plan_id = newPlanId;
subscription.metadata = {
...subscription.metadata,
plan_changed_at: new Date().toISOString(),
};
return this.subscriptionRepo.save(subscription);
}
async renewSubscription(tenantId: string): Promise<Subscription> {
const subscription = await this.getSubscription(tenantId);
if (!subscription) {
throw new NotFoundException('Subscription not found');
}
const now = new Date();
const newPeriodEnd = new Date(subscription.current_period_end);
newPeriodEnd.setMonth(newPeriodEnd.getMonth() + 1);
subscription.current_period_start = subscription.current_period_end;
subscription.current_period_end = newPeriodEnd;
subscription.status = SubscriptionStatus.ACTIVE;
return this.subscriptionRepo.save(subscription);
}
// ==================== Invoices ====================
async createInvoice(
tenantId: string,
subscriptionId: string,
lineItems: Array<{
description: string;
quantity: number;
unit_price: number;
}>,
): Promise<Invoice> {
const invoiceNumber = await this.generateInvoiceNumber();
const items = lineItems.map((item) => ({
...item,
amount: item.quantity * item.unit_price,
}));
const subtotal = items.reduce((sum, item) => sum + item.amount, 0);
const tax = subtotal * 0.16; // 16% IVA
const total = subtotal + tax;
const dueDate = new Date();
dueDate.setDate(dueDate.getDate() + 15);
const invoice = this.invoiceRepo.create({
tenant_id: tenantId,
subscription_id: subscriptionId,
invoice_number: invoiceNumber,
status: InvoiceStatus.OPEN,
subtotal,
tax,
total,
due_date: dueDate,
line_items: items,
});
return this.invoiceRepo.save(invoice);
}
async getInvoices(
tenantId: string,
options?: { page?: number; limit?: number },
): Promise<{ data: Invoice[]; total: number; page: number; limit: number }> {
const page = options?.page || 1;
const limit = options?.limit || 10;
const [data, total] = await this.invoiceRepo.findAndCount({
where: { tenant_id: tenantId },
order: { created_at: 'DESC' },
skip: (page - 1) * limit,
take: limit,
});
return { data, total, page, limit };
}
async getInvoice(invoiceId: string, tenantId: string): Promise<Invoice> {
const invoice = await this.invoiceRepo.findOne({
where: { id: invoiceId, tenant_id: tenantId },
});
if (!invoice) {
throw new NotFoundException('Invoice not found');
}
return invoice;
}
async markInvoicePaid(invoiceId: string, tenantId: string): Promise<Invoice> {
const invoice = await this.getInvoice(invoiceId, tenantId);
invoice.status = InvoiceStatus.PAID;
invoice.paid_at = new Date();
return this.invoiceRepo.save(invoice);
}
async voidInvoice(invoiceId: string, tenantId: string): Promise<Invoice> {
const invoice = await this.getInvoice(invoiceId, tenantId);
if (invoice.status === InvoiceStatus.PAID) {
throw new BadRequestException('Cannot void a paid invoice');
}
invoice.status = InvoiceStatus.VOID;
return this.invoiceRepo.save(invoice);
}
private async generateInvoiceNumber(): Promise<string> {
const year = new Date().getFullYear();
const month = String(new Date().getMonth() + 1).padStart(2, '0');
const count = await this.invoiceRepo.count();
const sequence = String(count + 1).padStart(6, '0');
return `INV-${year}${month}-${sequence}`;
}
// ==================== Payment Methods ====================
async addPaymentMethod(
tenantId: string,
dto: CreatePaymentMethodDto,
): Promise<PaymentMethod> {
// If this is set as default, unset other defaults
if (dto.is_default) {
await this.paymentMethodRepo.update(
{ tenant_id: tenantId, is_default: true },
{ is_default: false },
);
}
const paymentMethod = this.paymentMethodRepo.create({
tenant_id: tenantId,
...dto,
});
return this.paymentMethodRepo.save(paymentMethod);
}
async getPaymentMethods(tenantId: string): Promise<PaymentMethod[]> {
return this.paymentMethodRepo.find({
where: { tenant_id: tenantId, is_active: true },
order: { is_default: 'DESC', created_at: 'DESC' },
});
}
async getDefaultPaymentMethod(tenantId: string): Promise<PaymentMethod | null> {
return this.paymentMethodRepo.findOne({
where: { tenant_id: tenantId, is_default: true, is_active: true },
});
}
async setDefaultPaymentMethod(
paymentMethodId: string,
tenantId: string,
): Promise<PaymentMethod> {
const paymentMethod = await this.paymentMethodRepo.findOne({
where: { id: paymentMethodId, tenant_id: tenantId },
});
if (!paymentMethod) {
throw new NotFoundException('Payment method not found');
}
// Unset current default
await this.paymentMethodRepo.update(
{ tenant_id: tenantId, is_default: true },
{ is_default: false },
);
paymentMethod.is_default = true;
return this.paymentMethodRepo.save(paymentMethod);
}
async removePaymentMethod(
paymentMethodId: string,
tenantId: string,
): Promise<void> {
const paymentMethod = await this.paymentMethodRepo.findOne({
where: { id: paymentMethodId, tenant_id: tenantId },
});
if (!paymentMethod) {
throw new NotFoundException('Payment method not found');
}
if (paymentMethod.is_default) {
throw new BadRequestException('Cannot remove default payment method');
}
paymentMethod.is_active = false;
await this.paymentMethodRepo.save(paymentMethod);
}
// ==================== Usage & Billing Summary ====================
async getBillingSummary(tenantId: string): Promise<{
subscription: Subscription | null;
defaultPaymentMethod: PaymentMethod | null;
pendingInvoices: number;
totalDue: number;
}> {
const subscription = await this.getSubscription(tenantId);
const defaultPaymentMethod = await this.getDefaultPaymentMethod(tenantId);
const pendingInvoices = await this.invoiceRepo.find({
where: { tenant_id: tenantId, status: InvoiceStatus.OPEN },
});
const totalDue = pendingInvoices.reduce(
(sum, inv) => sum + Number(inv.total),
0,
);
return {
subscription,
defaultPaymentMethod,
pendingInvoices: pendingInvoices.length,
totalDue,
};
}
async checkSubscriptionStatus(tenantId: string): Promise<{
isActive: boolean;
daysRemaining: number;
status: SubscriptionStatus;
}> {
const subscription = await this.getSubscription(tenantId);
if (!subscription) {
return { isActive: false, daysRemaining: 0, status: SubscriptionStatus.EXPIRED };
}
const now = new Date();
const periodEnd = new Date(subscription.current_period_end);
const daysRemaining = Math.ceil(
(periodEnd.getTime() - now.getTime()) / (1000 * 60 * 60 * 24),
);
const isActive = [
SubscriptionStatus.ACTIVE,
SubscriptionStatus.TRIAL,
].includes(subscription.status);
return {
isActive,
daysRemaining: Math.max(0, daysRemaining),
status: subscription.status,
};
}
}
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