import {z} from 'zod'

export type GenerateAiHookRequest = {leadId: string, locale?: string | undefined, mode?: ('native' | 'translate') | undefined};

export type CreateApiV1AiHookArgs = {'Idempotency-Key'?: string | undefined, body: GenerateAiHookRequest};

export type CreateApiV1AiHookOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiCost = z.object({credits: z.number().int().optional(), pence: z.number().int().optional()});

export const aiHookGenerateResponse = z.object({success: z.boolean().optional(), data: z.object({leadId: z.string().optional(), hook: z.string().optional(), locale: z.string().optional(), mode: z.enum(["native", "translate"]).optional(), model: z.string().optional(), cached: z.boolean().optional(), cost: aiCost.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
};

/**
 * Generate an AI hook for one lead (synchronous)
 * 
 * POST /v1/ai/hook
 * 
 * Also accepts auth: apiKeyAuth
 */
export const createApiV1AiHook = async (args: CreateApiV1AiHookArgs, options?: CreateApiV1AiHookOptions) => {
const {baseUrl = "https://api.meirra.com", 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['Idempotency-Key'] != null) headers.set("Idempotency-Key", String(args['Idempotency-Key']))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/ai/hook${query.size > 0 ? `?${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(aiHookGenerateResponse, await res.json())
};