import {z} from 'zod'

export type Message = {role: string, content: string};

export type AIAdvisorRequest = {message: string, conversationHistory?: Array<Message> | undefined, dateRangeOverride?: ({[key: string]: string} | null) | undefined, userId?: (string | null) | undefined, programId?: (string | null) | undefined, transactionSummary?: ({[key: string]: unknown} | null) | undefined, transactionDetails?: (Array<{[key: string]: unknown}> | null) | undefined, currencyCode?: string | undefined, currencySymbol?: string | undefined};

export type CreateApiApiAiAdvisorArgs = {authorization?: (string | null) | undefined, body: AIAdvisorRequest};

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

export const aIAdvisorResponse = z.object({response: z.string(), transactionCount: z.number().int(), transactionSummary: z.record(z.string(), z.unknown()), dateRange: z.record(z.string(), z.string()), warning: z.string().nullable().optional(), timestamp: z.string()});

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
};

/**
 * Chat With Advisor
 * 
 * POST /api/ai-advisor
 */
export const createApiApiAiAdvisor = async (args: CreateApiApiAiAdvisorArgs, options?: CreateApiApiAiAdvisorOptions) => {
const {baseUrl = "https://api.loyalty.dog", 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 (args.authorization != null) headers.set("authorization", String(args.authorization))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/ai-advisor${query.size > 0 ? `?${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(aIAdvisorResponse, await res.json())
};