import {z} from 'zod'

export type InferConfigRequest = {use_case_description: string, content_types?: Array<string> | undefined};

export type CreateApiV1OnboardingInferConfigArgs = {body: InferConfigRequest};

export type CreateApiV1OnboardingInferConfigOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const suggestedExtractor = z.object({name: z.string(), version: z.string().optional(), reason: z.string()});

export const suggestedStage = z.object({stage_name: z.string(), stage_type: z.string().optional(), description: z.string()});

export const sampleQuery = z.object({query: z.string(), description: z.string()});

export const inferConfigResponse = z.object({recommended_scaffold_id: z.string(), scaffold_name: z.string(), confidence: z.number().gte(0).lte(1), reasoning: z.string(), extractors: z.array(suggestedExtractor), retriever_stages: z.array(suggestedStage), sample_queries: z.array(sampleQuery), alternate_scaffold_id: z.string().nullable().optional(), alternate_scaffold_name: z.string().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
};

/**
 * Infer onboarding configuration
 * 
 * POST /v1/onboarding/infer-config
 */
export const createApiV1OnboardingInferConfig = async (args: CreateApiV1OnboardingInferConfigArgs, options?: CreateApiV1OnboardingInferConfigOptions) => {
const {baseUrl = "https://api.mixpeek.com", 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/onboarding/infer-config${query.size > 0 ? `?${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(inferConfigResponse, await res.json())
};