import {z} from 'zod'

export type IntegrationMode = 'TEXT' | 'AVATAR';

export type ChatMessage = {role: 'user' | 'assistant', content: string};

export type CreateApiSuggestionV2Args = {kb_id?: string | undefined, integration_mode?: IntegrationMode | undefined, avatar_id?: string | undefined, is_live_agent?: boolean | undefined, body: Array<ChatMessage>};

export type CreateApiSuggestionV2Options = {baseUrl: string, fetch?: typeof fetch | undefined};

export const createApiSuggestionV2Response = z.object({});

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
};

/**
 * Get Suggestion V2
 * 
 * POST /suggestion/v2
 */
export const createApiSuggestionV2 = async (args: CreateApiSuggestionV2Args, options: CreateApiSuggestionV2Options) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.kb_id != null) query.append("kb_id", String(args.kb_id))
if (args.integration_mode != null) query.append("integration_mode", String(args.integration_mode))
if (args.avatar_id != null) query.append("avatar_id", String(args.avatar_id))
if (args.is_live_agent != null) query.append("is_live_agent", String(args.is_live_agent))

const url = `${baseUrl.replace(/\/+$/, '')}/suggestion/v2${query.size > 0 ? `?${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(createApiSuggestionV2Response, await res.json())
};