import {z} from 'zod'

export type GetApiChannelChatAiSummaryArgs = {wabaNumber: string, customerNumber: string, startDate: string, endDate: string};

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

export const chatAiSummaryResponseDto = z.object({startDate: z.string().optional(), endDate: z.string().optional(), chatType: z.string().optional(), chatMessagesCount: z.number().int().optional(), callsCount: z.number().int().optional(), summaries: z.array(z.object({title: z.string().optional(), description: 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
};

/**
 * Get AI Summary of a 1:1 Chat
 * 
 * GET /channel/chat/ai-summary
 */
export const getApiChannelChatAiSummary = async (args: GetApiChannelChatAiSummaryArgs, options?: GetApiChannelChatAiSummaryOptions) => {
const {baseUrl = "https://public.doubletick.io", fetch: fetchFn = fetch, basic} = options ?? {}

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

if (args.wabaNumber != null) query.append("wabaNumber", String(args.wabaNumber))
if (args.customerNumber != null) query.append("customerNumber", String(args.customerNumber))
if (args.startDate != null) query.append("startDate", String(args.startDate))
if (args.endDate != null) query.append("endDate", String(args.endDate))
if (basic !== undefined) headers.set("Authorization", basic)

const url = `${baseUrl.replace(/\/+$/, '')}/channel/chat/ai-summary${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(chatAiSummaryResponseDto, await res.json())
};