import {z} from 'zod'

export type UsageEventRequest = {customer_id: number, order_id: number, name: string, qty: number, payload?: ({[key: string]: unknown} | Array<unknown> | string | number | boolean | null) | undefined} | {[key: string]: unknown};

export type CreateApiMeterEventArgs = {body: UsageEventRequest};

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

export const usageThreshold = z.object({level: z.string().optional(), threshold: z.union([z.literal(10), z.literal(25)]).optional(), message: z.string().optional()}).and(z.record(z.string(), z.unknown()));

export const usageStatus = z.object({used: z.number().optional(), remaining_free: z.number().optional(), remaining_free_percent: z.number().nullable().optional(), overage_qty: z.number().optional(), billable_qty: z.number().optional(), current_unbilled_amount: z.string().optional(), threshold: usageThreshold.nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const usageMeter = z.object({id: z.number().int().optional(), name: z.string().optional(), unit_label: z.string().optional(), included_allowance: z.number().optional(), unit_price: z.string().optional(), usage: usageStatus.optional()}).and(z.record(z.string(), z.unknown()));

export const usageEvent = z.object({id: z.number().int().optional(), metric: z.string().optional(), qty: z.number().optional(), unit_price: z.string().optional(), billable_qty: z.number().optional(), free_qty: z.number().optional(), amount: z.number().optional(), usage: usageStatus.nullable().optional(), meter: usageMeter.nullable().optional(), data: z.record(z.string(), z.unknown()).optional()}).and(z.record(z.string(), z.unknown()));

export const usageEventResponse = z.object({success: z.literal(true).optional(), data: usageEvent.optional()}).and(z.record(z.string(), z.unknown()));

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
};

/**
 * Record usage event
 * 
 * POST /meter-event
 */
export const createApiMeterEvent = async (args: CreateApiMeterEventArgs, options?: CreateApiMeterEventOptions) => {
const {baseUrl = "https://demo.onlinebillingform.com/api/v2", 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 = `${baseUrl.replace(/\/+$/, '')}/meter-event${query.size > 0 ? `?${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(usageEventResponse, await res.json())
};