import {z} from 'zod'

export type Subject = string;

export type Relationship = string;

export type Object = string | number | boolean;

export type Certainty = number;

export type CreateApiSessionIDResponseArgs = {sessionID: string, body: {answers?: (Array<{subject: Subject, relationship: Relationship, object: Object, certainty?: Certainty | undefined, answer?: ('yes' | 'no') | undefined, unanswered?: boolean | undefined}>) | undefined}};

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

export const canAdd = z.boolean();

export const prompt = z.string();

export const knownAnswers = z.array(z.unknown());

export const question = z.object({subject: z.string().optional(), object: z.string().optional(), objectType: z.string().optional(), objectMetadata: z.record(z.string(), z.unknown()).optional(), dataType: z.string().optional(), relationship: z.string().optional(), type: z.string().optional(), plural: z.boolean().optional(), allowCF: z.boolean().optional(), allowUnknown: z.boolean().optional(), canAdd: canAdd.optional(), prompt: prompt.optional(), knownAnswers: knownAnswers.optional(), concepts: z.array(z.object({conceptType: z.string().optional(), name: z.string().optional(), type: z.string().optional(), value: z.string().optional(), invalidResponse: z.boolean().optional()})).optional()});

export const questionResponse = z.object({question: question, extraQuestions: z.array(z.unknown()).optional(), sid: z.string(), stats: z.record(z.string(), z.unknown()).optional()});

export const subject = z.string();

export const object = z.union([z.string(), z.number(), z.boolean()]);

export const certainty = z.number().gte(1).lte(100);

export const relationship = z.string();

export const resultResponse = z.object({result: z.array(z.object({subject: subject.optional(), relationshipType: z.string().optional(), object: object.optional(), certainty: certainty.optional(), factID: z.string().optional(), relationship: relationship.optional(), subjectMetadata: z.record(z.string(), z.unknown()).optional(), objectMetadata: z.record(z.string(), z.unknown()).optional()})), queryProfile: z.array(z.unknown()).optional(), sid: z.string(), stats: z.record(z.string(), z.unknown()).optional()});

export const createApiSessionIDResponseResponse = z.union([questionResponse, resultResponse]);

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
};

/**
 * Response - Respond with an answer to a question
 * 
 * POST /{sessionID}/response
 */
export const createApiSessionIDResponse = async (args: CreateApiSessionIDResponseArgs, options?: CreateApiSessionIDResponseOptions) => {
const {baseUrl = "https://api.rainbird.ai", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/${encodeURIComponent(String(args.sessionID))}/response${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(createApiSessionIDResponseResponse, await res.json())
};