import {z} from 'zod'

export type EstimateCostParam = boolean;

export type MaxCreditsParam = number;

export type CreateApiExtractionsArgs = {body: {starting_url: string, goal_description: string, output_record_json_schema: Record<string, never>, name?: string | undefined, required_keys?: Array<string> | undefined, estimate_cost?: EstimateCostParam | undefined, max_credits?: MaxCreditsParam | undefined}};

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

export const creditEstimate = z.object({minimum: z.number(), expected: z.number().optional(), typical: z.object({low: z.number(), high: z.number()}).optional(), maximum: z.number(), upfront: z.number().optional(), charged_upfront: z.boolean()});

export const creditDetail = z.object({estimate: creditEstimate.nullable(), credits_used: z.number(), credits_remaining: z.number().optional(), sufficient_credits: z.boolean().optional()});

export const estimateCostResult = z.object({estimate_cost: z.literal(true), type: z.enum(["enrichment", "dataset_build", "extraction_discovery", "extraction", "monitor", "scrape", "quick_search", "search_agent"]), credit_detail: creditDetail});

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 extraction
 * 
 * POST /extractions
 */
export const createApiExtractions = async (args: CreateApiExtractionsArgs, options?: CreateApiExtractionsOptions) => {
const {baseUrl = "https://api.riveterhq.com/v1", 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('authorization', `Bearer ${ApiKeyAuth}`)

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