import {z} from 'zod'

export type UsageDirectionEnum = 'in' | 'out';

export type UsageTopTopicsReqBody = {tenant_ids?: (Array<string> | string | null) | undefined} | {[key: string]: unknown};

export type GetApiBillingUsageTopTopicsArgs = {start_date: string, end_date: string, direction?: UsageDirectionEnum | undefined, limit?: number | undefined, tenant_ids?: (string | null) | undefined, body: UsageTopTopicsReqBody | null};

export type GetApiBillingUsageTopTopicsOptions = {baseUrl?: string | undefined, FronteggHTTPAuthentication?: string | undefined, fetch?: typeof fetch | undefined};

export const usageDirectionEnum = z.enum(["in", "out"]);

export const usageTopicVolume = z.object({topic: z.string(), topic_display_name: z.string(), producer_id: z.string().nullable().optional(), producer_type: z.string().nullable().optional(), producer_name: z.string().nullable().optional(), volume_bytes: z.number().optional(), volume_gb: z.number().optional(), percentage: z.number().optional()}).and(z.record(z.string(), z.unknown()));

export const usageTopTopicsOthers = z.object({topic_count: z.number().int().optional(), volume_bytes: z.number().optional(), volume_gb: z.number().optional(), percentage: z.number().optional()}).and(z.record(z.string(), z.unknown()));

export const usageTopTopicsRes = z.object({direction: usageDirectionEnum, start_date: z.string(), end_date: z.string(), topics: z.array(usageTopicVolume).optional(), others: usageTopTopicsOthers.optional(), total_volume_bytes: z.number().optional(), total_volume_gb: z.number().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
};

/**
 * Top topics by data volume
 * 
 * GET /billing/usage/top-topics
 */
export const getApiBillingUsageTopTopics = async (args: GetApiBillingUsageTopTopicsArgs, options?: GetApiBillingUsageTopTopicsOptions) => {
const {baseUrl = "https://api.streamkap.com", fetch: fetchFn = fetch, FronteggHTTPAuthentication} = options ?? {}

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

if (args.start_date != null) query.append("start_date", String(args.start_date))
if (args.end_date != null) query.append("end_date", String(args.end_date))
if (args.direction != null) query.append("direction", String(args.direction))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.tenant_ids != null) query.append("tenant_ids", String(args.tenant_ids))
if (FronteggHTTPAuthentication !== undefined) headers.set('authorization', `Bearer ${FronteggHTTPAuthentication}`)

const url = `${baseUrl.replace(/\/+$/, '')}/billing/usage/top-topics${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", 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(usageTopTopicsRes, await res.json())
};