import {z} from 'zod'

export type GetApiApiCopilotTicketsTicketIdThreadArgs = {ticketId: number, accountId?: number | undefined, departmentId?: number | undefined};

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

export const ticketThreadMessageDto = z.object({author: z.string().nullable().optional(), text: z.string().nullable().optional(), at: z.string().nullable().optional()});

export const ticketThreadDto = z.object({subject: z.string().nullable().optional(), accountName: z.string().nullable().optional(), departmentName: z.string().nullable().optional(), messages: z.array(ticketThreadMessageDto).nullable().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
};

/**
 * Returns the ticket's conversation thread ({subject, messages[]}, oldest-first) for
 * the AI summary-service. Same shared-secret auth as the config endpoint (class-level
 * attribute; the absolute route below only overrides the class route TEMPLATE, not the
 * auth filter). Hard caps enforced by Infoset.Service.Hubs.Ticket.Service.ITicketThreadService: private notes
 * excluded, last 50 logs, 2000 chars per message, 24000 chars total. A ticket that does
 * not exist in the account — including a foreign-tenant ticket id, since every query is
 * ACCOUNT_ID-scoped — yields 404.
 * 
 * GET /api/copilot/tickets/{ticketId}/thread
 * 
 * Also accepts auth: API Key
 */
export const getApiApiCopilotTicketsTicketIdThread = async (args: GetApiApiCopilotTicketsTicketIdThreadArgs, options: GetApiApiCopilotTicketsTicketIdThreadOptions) => {
const {baseUrl, fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (args.accountId != null) query.append("accountId", String(args.accountId))
if (args.departmentId != null) query.append("departmentId", String(args.departmentId))
if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/copilot/tickets/${encodeURIComponent(String(args.ticketId))}/thread${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(ticketThreadDto, await res.json())
};