import {z} from 'zod'

export type GetApiV1LoopsCheckpointsArgs = {run_id?: (string | null) | undefined, base_model?: (string | null) | undefined, checkpoint_path?: (string | null) | undefined};

export type GetApiV1LoopsCheckpointsOptions = {baseUrl: string, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const trainerCheckpointTarget = z.enum(["sampler", "trainer"]);

export const loopsCheckpointV1 = z.object({checkpoint_id: z.string(), created_at: z.string(), checkpoint_type: z.string(), base_model: z.string().nullable(), lora_adapter_config: z.record(z.string(), z.unknown()).nullable(), size_bytes: z.number().int(), sync_status: z.string().nullable().optional(), id: z.string(), run_id: z.string(), target: trainerCheckpointTarget});

export const listLoopsCheckpointsResponseV1 = z.object({checkpoints: z.array(loopsCheckpointV1)});

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
};

/**
 * Lists Loops checkpoints
 * 
 * GET /v1/loops/checkpoints
 */
export const getApiV1LoopsCheckpoints = async (args: GetApiV1LoopsCheckpointsArgs, options: GetApiV1LoopsCheckpointsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.run_id != null) query.append("run_id", String(args.run_id))
if (args.base_model != null) query.append("base_model", String(args.base_model))
if (args.checkpoint_path != null) query.append("checkpoint_path", String(args.checkpoint_path))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/loops/checkpoints${query.size > 0 ? `?${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(listLoopsCheckpointsResponseV1, await res.json())
};