import {z} from 'zod'

export type UsageInterval = 'day' | 'week' | 'month';

export type UsageCreditsGroupBy = 'capability' | 'model' | 'voice' | 'api_key';

export type GetApiUsageCreditsArgs = {'Cartesia-Version': '2026-03-01', start_ts?: (string | null) | undefined, end_ts?: (string | null) | undefined, interval?: UsageInterval | undefined, api_key_id?: (string | null) | undefined, group_by?: UsageCreditsGroupBy | undefined};

export type GetApiUsageCreditsOptions = {baseUrl?: string | undefined, AdminAPIKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const usageCreditsGroupBy = z.enum(["capability", "model", "voice", "api_key"]);

export const usageBucketStartTimestamp = z.string();

export const usageBucketEndTimestamp = z.string();

export const usageCreditsBucket = z.object({start_ts: usageBucketStartTimestamp, end_ts: usageBucketEndTimestamp, credits: z.number().int()});

export const usageCreditsBreakdownSeries = z.object({id: z.string(), label: z.string().nullable().optional(), buckets: z.array(usageCreditsBucket)});

export const usageCreditsResponse = z.object({group_by: usageCreditsGroupBy.optional(), data: z.array(z.union([usageCreditsBucket, usageCreditsBreakdownSeries]))});

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
};

/**
 * Get Credit Usage
 * 
 * GET /usage/credits
 */
export const getApiUsageCredits = async (args: GetApiUsageCreditsArgs, options?: GetApiUsageCreditsOptions) => {
const {baseUrl = "https://api.cartesia.ai", fetch: fetchFn = fetch, AdminAPIKeyAuth} = options ?? {}

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

if (args['Cartesia-Version'] != null) headers.set("Cartesia-Version", String(args['Cartesia-Version']))
if (args.start_ts != null) query.append("start_ts", String(args.start_ts))
if (args.end_ts != null) query.append("end_ts", String(args.end_ts))
if (args.interval != null) query.append("interval", String(args.interval))
if (args.api_key_id != null) query.append("api_key_id", String(args.api_key_id))
if (args.group_by != null) query.append("group_by", String(args.group_by))
if (AdminAPIKeyAuth !== undefined) headers.set('authorization', `Bearer ${AdminAPIKeyAuth}`)

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