import {z} from 'zod'

export type Dialog = {skill_id: string, lang: string, event_name: 'NEW_INPUT' | 'NEW_DIALOG_SESSION' | 'END_SESSION', input_type?: ('text' | 'postback' | 'autocomplete' | 'voice' | 'event') | undefined, input: string, platform: 'messenger' | 'rcs' | 'skype' | 'sms' | 'slack' | 'telegram' | 'twitter' | 'viber' | 'whatsapp' | 'maxit' | 'application' | 'api' | 'other', user_id: string, user_data: Record<string, never>, verbose?: boolean | undefined, streaming?: boolean | undefined};

export type CreateApiDialogArgs = {body: Dialog};

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

export const dialogGet = z.object({answer: z.string().optional(), input: z.string().optional(), intent: z.string().optional(), intent_id: z.string().optional(), reprompt: z.string().optional(), confidence: z.string().optional(), confidence_threshold: z.string().optional(), end_session: z.boolean().optional(), payload: z.object({}).optional(), rich_text: z.array(z.object({})).optional(), lang: z.string().optional(), master_bot: z.boolean().optional(), muted: z.boolean().optional(), need_help: z.boolean().optional(), never_trained: z.boolean().optional(), platform: z.string().optional(), skill_id: z.string().optional(), state_id: z.string().optional(), state_name: z.string().optional(), probabilistic_nlu_processing_time: z.number().int().optional(), rule_based_nlu_processing_time: z.number().int().optional(), input_type: z.string().optional(), dialog_management_processing_time: z.number().int().optional(), handover_category_name: z.string().optional(), show_answer_survey: z.boolean().optional(), show_conversation_survey: z.boolean().optional(), understood: z.boolean().optional(), understood_nlu: z.boolean().optional(), client_id: z.string().optional(), client_session_id: z.string().optional(), user_id: z.string().optional(), error: z.object({code: z.string().optional(), message: z.string().optional()}).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
};

/**
 * Dialog
 * 
 * POST /dialog/
 */
export const createApiDialog = async (args: CreateApiDialogArgs, options?: CreateApiDialogOptions) => {
const {baseUrl = "https://apis.smartly.ai", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (Bearer !== undefined) headers.set("Authorization", Bearer)

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