import {z} from 'zod'

export type BillingSubscriptionItem = {price_id: string, quantity?: number | undefined};

export type BillingSubscriptionUpdate = {items: Array<BillingSubscriptionItem>};

export type CreateApiBillingSubscriptionsSubscriptionIdPreviewArgs = {subscription_id: string, body: BillingSubscriptionUpdate};

export type CreateApiBillingSubscriptionsSubscriptionIdPreviewOptions = {baseUrl: string, JWTAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const paddleBillingSubscriptionStatus = z.enum(["active", "canceled", "past_due", "paused", "trialing"]);

export const billingPeriod = z.object({starts_at: z.string(), ends_at: z.string()});

export const duration = z.object({interval: z.string(), frequency: z.number().int()});

export const moneyAmount = z.object({amount: z.string(), currency_code: z.string()});

export const quantityConstraints = z.object({minimum: z.number().int(), maximum: z.number().int()});

export const paddleBillingPrice = z.object({id: z.string(), product_id: z.string(), name: z.string().optional(), description: z.string().optional(), type: z.string().optional(), billing_cycle: duration.optional(), trial_period: duration.optional(), tax_mode: z.string().optional(), unit_price: moneyAmount, unit_price_overrides: z.array(z.object({})).optional(), quantity: quantityConstraints.optional(), status: z.string(), custom_data: z.object({}).optional(), created_at: z.string().optional(), updated_at: z.string().optional(), import_meta: z.object({}).optional()});

export const paddleBillingProduct = z.object({id: z.string(), name: z.string(), type: z.string().optional(), tax_category: z.string().optional(), description: z.string().optional(), image_url: z.string().optional(), custom_data: z.object({}).optional(), status: z.string(), created_at: z.string().optional(), updated_at: z.string().optional(), import_meta: z.object({}).optional()});

export const paddleBillingSubscriptionItem = z.object({status: z.string(), quantity: z.number().int(), price: paddleBillingPrice, product: paddleBillingProduct, recurring: z.boolean().optional(), trial_dates: z.object({}).optional(), created_at: z.string().optional(), updated_at: z.string().optional(), next_billed_at: z.string().optional(), previously_billed_at: z.string().optional()});

export const paddleBillingTransactionProduct = z.object({id: z.string(), name: z.string(), description: z.string().optional(), custom_data: z.object({}).optional(), image_url: z.string().optional()});

export const transactionItemTotals = z.object({discount: z.number().int(), subtotal: z.number().int(), tax: z.number().int(), total: z.number().int()});

export const paddleBillingTransactionLineItem = z.object({price_id: z.string(), product: paddleBillingTransactionProduct, quantity: z.number().int(), totals: transactionItemTotals, unit_totals: transactionItemTotals, tax_rate: z.string().optional()});

export const transactionTotals = z.object({subtotal: z.string(), tax: z.string(), discount: z.string(), total: z.string(), grand_total: z.string(), fee: z.string().optional(), credit: z.string(), credit_to_balance: z.string(), balance: z.string(), earnings: z.string().optional(), currency_code: z.string()});

export const paddleBillingTransactionDetails = z.object({line_items: z.array(paddleBillingTransactionLineItem), totals: transactionTotals});

export const subscriptionUpdateTransaction = z.object({billing_period: billingPeriod, details: paddleBillingTransactionDetails});

export const billingTransactionPreview = z.object({id: z.string(), status: paddleBillingSubscriptionStatus, customer_id: z.string(), currency_code: z.string(), created_at: z.string(), updated_at: z.string(), started_at: z.string().optional(), first_billed_at: z.string().optional(), next_billed_at: z.string().optional(), paused_at: z.string().optional(), canceled_at: z.string().optional(), collection_mode: z.string().optional(), billing_details: z.object({}).optional(), current_billing_period: billingPeriod.optional(), billing_cycle: duration.optional(), scheduled_change: z.object({}).optional(), items: z.array(paddleBillingSubscriptionItem), custom_data: z.object({}).optional(), immediate_transaction: subscriptionUpdateTransaction.optional(), next_transaction: subscriptionUpdateTransaction.optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Preview a Paddle Billing subscription transaction
 * 
 * POST /billing/subscriptions/{subscription_id}/preview
 * 
 * Also accepts auth: APIKeyAuth
 */
export const createApiBillingSubscriptionsSubscriptionIdPreview = async (args: CreateApiBillingSubscriptionsSubscriptionIdPreviewArgs, options: CreateApiBillingSubscriptionsSubscriptionIdPreviewOptions) => {
const {baseUrl, fetch: fetchFn = fetch, JWTAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (JWTAuth !== undefined) headers.set('authorization', `Bearer ${JWTAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/billing/subscriptions/${encodeURIComponent(String(args.subscription_id))}/preview${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(billingTransactionPreview, await res.json())
};