import {z} from 'zod'

export type DatasetReference = {name: string, version?: (string | null) | undefined};

export type RLConfig = {max_steps?: (number | null) | undefined, kl_beta?: (number | null) | undefined, group_size?: (number | null) | undefined, sampling_temperature?: (number | null) | undefined, max_completion_length?: (number | null) | undefined, logging_steps?: (number | null) | undefined, dpo_beta?: (number | null) | undefined, loss_type?: (string | null) | undefined, reward_type?: (string | null) | undefined, extras?: {[key: string]: unknown} | undefined};

export type TrainingPipelineStageCreate = {base_model: string, training_type?: ('full' | 'lora' | 'qlora') | undefined, training_algorithm?: ('sft' | 'dpo' | 'grpo') | undefined, datasets: Array<DatasetReference>, parent_stage_index?: (number | null) | undefined, merge_parent_before?: boolean | undefined, rl_config?: (RLConfig | null) | undefined};

export type TrainingPipelineCreate = {model_name: string, project_id?: (string | null) | undefined, stages: Array<TrainingPipelineStageCreate>, auto_deploy_final_stage?: boolean | undefined};

export type CreateApiV1TrainingPipelinesArgs = {body: TrainingPipelineCreate};

export type CreateApiV1TrainingPipelinesOptions = {baseUrl: string, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const trainingPipelineStageCreateResponse = z.object({job_id: z.string(), stage_index: z.number().int(), status: z.string(), job_reference: z.string().nullable().optional(), provider_name: z.string().nullable().optional()});

export const trainingPipelineCreateResponse = z.object({pipeline_id: z.string(), status: z.string(), estimated_total_usd: z.number().nullable().optional(), stages: z.array(trainingPipelineStageCreateResponse)});

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 Training Pipeline
 * 
 * POST /v1/training-pipelines
 * 
 * Also accepts auth: BearerAuth
 */
export const createApiV1TrainingPipelines = async (args: CreateApiV1TrainingPipelinesArgs, options: CreateApiV1TrainingPipelinesOptions) => {
const {baseUrl, fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (ApiKeyAuth !== undefined) headers.set("X-API-Key", ApiKeyAuth)

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