import {z} from 'zod'

export type CreateApiV1BatchesArgs = {body: {input_file_id: string, endpoint: '/v1/chat/completions' | '/v1/responses' | '/v1/embeddings', completion_window: '24h', metadata?: ({[key: string]: string} | null) | undefined}};

export type CreateApiV1BatchesOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const batch = z.object({id: z.string(), object: z.literal("batch"), endpoint: z.enum(["/v1/chat/completions", "/v1/responses", "/v1/embeddings"]), errors: z.object({object: z.literal("list"), data: z.array(z.object({code: z.string(), message: z.string(), param: z.string().nullable(), line: z.number().nullable()}))}).nullable(), input_file_id: z.string(), completion_window: z.string(), status: z.enum(["validating", "failed", "in_progress", "finalizing", "completed", "expired", "cancelling", "cancelled"]), output_file_id: z.string().nullable(), error_file_id: z.string().nullable(), created_at: z.number(), in_progress_at: z.number().nullable(), expires_at: z.number().nullable(), finalizing_at: z.number().nullable(), completed_at: z.number().nullable(), failed_at: z.number().nullable(), expired_at: z.number().nullable(), cancelling_at: z.number().nullable(), cancelled_at: z.number().nullable(), request_counts: z.object({total: z.number(), completed: z.number(), failed: z.number()}), metadata: z.record(z.string(), z.string()).nullable()});

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
};

/**
 * Create batch
 * 
 * POST /v1/batches
 */
export const createApiV1Batches = async (args: CreateApiV1BatchesArgs, options?: CreateApiV1BatchesOptions) => {
const {baseUrl = "https://api.llmgateway.io", 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 = `${baseUrl.replace(/\/+$/, '')}/v1/batches${query.size > 0 ? `?${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(batch, await res.json())
};