import {z} from 'zod'

export type GetApiV1UsageArgs = {start_time: string, end_time: string, bucket_width?: ('hour' | 'day') | undefined, breakdown_type?: (Array<'voice_id' | 'voice_name' | 'api_key' | 'model'>) | undefined, page_size?: number | undefined, next_page_token?: string | undefined};

export type GetApiV1UsageOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const usageResult = z.object({voice_id: z.string().optional(), voice_name: z.string().optional(), api_key: z.string().optional(), model: z.string().optional(), minutes_used: z.number()});

export const usageBucket = z.object({starting_at: z.string(), ending_at: z.string(), results: z.array(usageResult)});

export const usageAnalyticsResponse = z.object({data: z.array(usageBucket), next_page_token: z.string().optional(), total: z.number()});

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
};

/**
 * Retrieve advanced API usage analytics
 * 
 * GET /v1/usage
 */
export const getApiV1Usage = async (args: GetApiV1UsageArgs, options?: GetApiV1UsageOptions) => {
const {baseUrl = "https://supertoneapi.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.start_time != null) query.append("start_time", String(args.start_time))
if (args.end_time != null) query.append("end_time", String(args.end_time))
if (args.bucket_width != null) query.append("bucket_width", String(args.bucket_width))
for (const item of args.breakdown_type ?? []) query.append("breakdown_type", String(item))
if (args.page_size != null) query.append("page_size", String(args.page_size))
if (args.next_page_token != null) query.append("next_page_token", String(args.next_page_token))
if (apiKey !== undefined) headers.set("x-sup-api-key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/usage${query.size > 0 ? `?${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(usageAnalyticsResponse, await res.json())
};