import {z} from 'zod'

export type GetApiUsageMetersArgs = {status?: ('ACTIVE' | 'INACTIVE') | undefined, aggregations?: ('COUNT' | 'SUM') | undefined, nextToken?: string | undefined, pageSize?: number | undefined};

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

export const usageMeterFilterEntry = z.object({field: z.string(), value: z.string()});

export const usageMeterAggregation = z.enum(["COUNT", "SUM"]);

export const computation = z.object({id: z.string().max(50).optional(), matcher: z.string().max(1500).optional(), computation: z.string().max(500), order: z.number().int()});

export const usageMeter = z.object({id: z.string().max(20), name: z.string().max(50), billableName: z.string().max(255).optional(), displayName: z.string().max(255), description: z.string().max(255).optional(), filters: z.array(usageMeterFilterEntry).optional(), type: z.literal("COUNTER"), status: z.enum(["DRAFT", "ACTIVE", "INACTIVE", "ARCHIVED"]).optional(), aggregation: usageMeterAggregation, computations: z.array(computation).optional(), createdAt: z.string().optional(), lastActivatedAt: z.string().optional(), updatedAt: z.string().optional()});

export const paginationOptions = z.object({pageSize: z.number().int().optional(), sortOrder: z.enum(["ASC", "DESC"]).optional()});

export const usageMeterPaginatedResponse = z.object({data: z.array(usageMeter).optional(), nextToken: z.string().optional(), context: paginationOptions.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
};

/**
 * List usage meters for event schema
 * 
 * GET /usage_meters
 */
export const getApiUsageMeters = async (args: GetApiUsageMetersArgs, options?: GetApiUsageMetersOptions) => {
const {baseUrl = "https://api.togai.com", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.status != null) query.append("status", String(args.status))
if (args.aggregations != null) query.append("aggregations", String(args.aggregations))
if (args.nextToken != null) query.append("nextToken", String(args.nextToken))
if (args.pageSize != null) query.append("pageSize", String(args.pageSize))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/usage_meters${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

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

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