// Tenant self-service billing helpers — wraps /api/v1/billing/* on arcadia-core.
//
// The provider is resolved server-side (mock in dev, a real PSP in prod), so
// these helpers are provider-agnostic: `createCheckoutSession` returns a hosted
// URL to redirect the browser to, whatever the backend provider is.
// Shapes mirror `ArcadiaWeb.API.BillingJSON`.

import type { ArcadiaClient } from "@crema/arcadia-client"

// ============================================================================
// Wire types
// ============================================================================

export interface BillingOverview {
  billing_model: string | null
  plan: string
  subscription_status: string
  current_period_start: string | null
  current_period_end: string | null
  trial_ends_at: string | null
  billing_email: string | null
  plan_limits: Record<string, unknown>
  tenant_limits: Record<string, unknown>
}

export interface PlanPricing {
  period: string
  price_cents: number
  currency: string
  discount_label: string | null
}

export interface PlanMeter {
  meter_key: string
  included_units: number | null
  overage_price_cents: number | null
}

export interface CatalogPlan {
  slug: string
  name: string
  description: string | null
  billing_track: string
  trial_days: number
  metadata: Record<string, unknown>
  pricing: PlanPricing[]
  meters: PlanMeter[]
}

export interface Invoice {
  id: string | null
  amount: number | null
  currency: string | null
  status: string | null
  due_date: string | null
  paid_at: string | null
  invoice_url: string | null
  pdf_url: string | null
}

export interface CheckoutSession {
  url: string
}

export interface PortalSession {
  url: string
}

// ============================================================================
// Reads
// ============================================================================

export async function getBillingOverview(
  arcadia: ArcadiaClient,
): Promise<BillingOverview> {
  const res = await arcadia.GET<{ data: BillingOverview }>(
    "/api/v1/billing/overview",
  )
  return res.data
}

export async function listBillingPlans(
  arcadia: ArcadiaClient,
): Promise<CatalogPlan[]> {
  const res = await arcadia.GET<{ data: CatalogPlan[] }>(
    "/api/v1/billing/plans",
  )
  return res.data
}

export async function listInvoices(
  arcadia: ArcadiaClient,
  opts: { limit?: number } = {},
): Promise<Invoice[]> {
  const qs = opts.limit ? `?limit=${opts.limit}` : ""
  const res = await arcadia.GET<{ data: Invoice[] }>(
    `/api/v1/billing/invoices${qs}`,
  )
  return res.data
}

// ============================================================================
// Actions
// ============================================================================

/**
 * Create a hosted checkout session for `plan` and return the URL to redirect
 * the browser to. `successUrl`/`cancelUrl` are where the provider returns the
 * user (default: back to this page).
 */
export async function createCheckoutSession(
  arcadia: ArcadiaClient,
  input: { plan: string; successUrl?: string; cancelUrl?: string },
): Promise<CheckoutSession> {
  const res = await arcadia.POST<{ data: CheckoutSession }>(
    "/api/v1/billing/checkout",
    {
      body: {
        plan: input.plan,
        success_url: input.successUrl,
        cancel_url: input.cancelUrl,
      },
    },
  )
  return res.data
}

/** Create a billing-portal session for self-service payment management. */
export async function createPortalSession(
  arcadia: ArcadiaClient,
  input: { returnUrl?: string } = {},
): Promise<PortalSession> {
  const res = await arcadia.POST<{ data: PortalSession }>(
    "/api/v1/billing/portal",
    { body: { return_url: input.returnUrl } },
  )
  return res.data
}

/** Cancel the active subscription (at period end). */
export async function cancelSubscription(
  arcadia: ArcadiaClient,
): Promise<void> {
  await arcadia.POST("/api/v1/billing/cancel", { body: {} })
}