import {z} from 'zod'

export type ConstraintRequest = {description: string, choices?: (Array<string> | null) | undefined, weights?: (Array<number> | null) | undefined, probability?: (number | null) | undefined};

export type ExpandConstraintChoicesRequest = {user_id?: (string | null) | undefined, constraint: ConstraintRequest, task_description: string, max_count?: number | undefined};

export type CreateApiV1ConstraintsExpandArgs = {body: ExpandConstraintChoicesRequest};

export type CreateApiV1ConstraintsExpandOptions = {baseUrl: string, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const constraintRequest = z.object({description: z.string(), choices: z.array(z.string()).nullable().optional(), weights: z.array(z.number()).nullable().optional(), probability: z.number().gte(0).lte(1).nullable().optional()});

export const expandConstraintChoicesResponse = z.object({success: z.boolean(), constraint: constraintRequest, expanded_choices: z.array(z.string()), count: z.number().int(), token_usage: z.number().int().nullable().optional()});

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
};

/**
 * Expand Constraint Choices Endpoint
 * 
 * POST /v1/constraints/expand
 * 
 * Also accepts auth: BearerAuth
 */
export const createApiV1ConstraintsExpand = async (args: CreateApiV1ConstraintsExpandArgs, options: CreateApiV1ConstraintsExpandOptions) => {
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/constraints/expand${query.size > 0 ? `?${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(expandConstraintChoicesResponse, await res.json())
};