import {z} from 'zod'

export type EventInputObject = {transaction_id: string, external_subscription_id: string, code: string, timestamp?: (number | string) | undefined, precise_total_amount_cents?: (string | null) | undefined, properties?: ({target_wallet_code?: (string | null) | undefined} | {[key: string]: string | number | number} | null) | undefined};

export type EventInput = {event: EventInputObject};

export type CreateApiEventsArgs = {body: EventInput};

export type CreateApiEventsOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const eventCreated = z.object({event: z.object({lago_id: z.string().nullable().optional(), transaction_id: z.string(), lago_customer_id: z.string().nullable(), code: z.string(), timestamp: z.string(), precise_total_amount_cents: z.string().nullable().optional(), properties: z.object({operation_type: z.enum(["add", "remove"]).nullable().optional()}).and(z.record(z.string(), z.union([z.string(), z.number().int(), z.number()]))).optional(), lago_subscription_id: z.string().nullable(), external_subscription_id: z.string(), created_at: z.string().nullable().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
};

/**
 * Send a usage event
 * 
 * POST /events
 */
export const createApiEvents = async (args: CreateApiEventsArgs, options?: CreateApiEventsOptions) => {
const {baseUrl = "https://api.getlago.com/api/v1", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/events${query.size > 0 ? `?${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(eventCreated, await res.json())
};