import {z} from 'zod'

export type EnautilusStepRequest = {problem_id: number, session_id?: (number | null) | undefined, parent_state_id?: (number | null) | undefined, representative_solutions_id?: (number | null) | undefined, current_iteration: number, iterations_left: number, selected_point: {[key: string]: number}, reachable_point_indices: Array<number>, number_of_intermediate_points: number};

export type CreateApiMethodEnautilusStepArgs = {body: EnautilusStepRequest};

export type CreateApiMethodEnautilusStepOptions = {baseUrl: string, OAuth2PasswordBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const eNautilusResult = z.object({current_iteration: z.number().int(), iterations_left: z.number().int(), intermediate_points: z.array(z.record(z.string(), z.number())), reachable_best_bounds: z.array(z.record(z.string(), z.number())), reachable_worst_bounds: z.array(z.record(z.string(), z.number())), closeness_measures: z.array(z.number()), reachable_point_indices: z.array(z.array(z.number().int()))});

export const eNautilusState = z.object({id: z.number().int().nullable().optional(), non_dominated_solutions_id: z.number().int().nullable().optional(), current_iteration: z.number().int(), iterations_left: z.number().int(), selected_point: z.record(z.string(), z.number()).nullable().optional(), reachable_point_indices: z.array(z.number().int()).optional(), number_of_intermediate_points: z.number().int(), enautilus_results: eNautilusResult});

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
};

/**
 * Step
 * 
 * POST /method/enautilus/step
 * 
 * Also accepts auth: APIKeyCookie
 */
export const createApiMethodEnautilusStep = async (args: CreateApiMethodEnautilusStepArgs, options: CreateApiMethodEnautilusStepOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2PasswordBearer} = options ?? {}

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

if (OAuth2PasswordBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2PasswordBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/method/enautilus/step${query.size > 0 ? `?${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(eNautilusState, await res.json())
};