import {z} from 'zod'

export type GetApiApiGenaiConfigArgs = {accountId?: number | undefined, departmentId?: number | undefined, roomId?: number | undefined};

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

export const genAiConfigDto = z.object({accountId: z.number().int().optional(), departmentId: z.number().int().optional(), enabled: z.boolean().optional(), aiBotId: z.number().int().nullable().optional(), maxResponseTokens: z.number().int().optional(), idleWarningMinutes: z.number().int().optional(), idleCloseMinutes: z.number().int().optional(), selectedDeskIds: z.array(z.string()).nullable().optional(), botDisplayName: z.string().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 resolved configuration for one `(accountId, departmentId)` pair.
 *             
 * 404 when the brand has no row — deliberately not a 200 carrying `enabled: false`. The
 * caller treats 404 as "disabled, cache the negative", which is cheaper and unambiguous. A row
 * that was explicitly switched off does return 200 with `enabled: false`.
 * 
 * GET /api/genai/config
 * 
 * Also accepts auth: API Key
 */
export const getApiApiGenaiConfig = async (args: GetApiApiGenaiConfigArgs, options: GetApiApiGenaiConfigOptions) => {
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 (args.roomId != null) query.append("roomId", String(args.roomId))
if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

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