import {z} from 'zod'

export type ReferenceGeneration = {generation_request_id?: (string | null) | undefined, index?: number | undefined};

export type MediaType = 'photography' | 'illustration';

export type ReplaceBackgroundRequest = {prompt?: (string | null) | undefined, reference_asset_id?: (string | null) | undefined, reference_generation?: ReferenceGeneration | undefined, product_id?: (number | null) | undefined, media_type?: MediaType | undefined, negative_prompt?: (string | null) | undefined, background_color?: (string | null) | undefined, project_code?: (string | null) | undefined, notes?: (string | null) | undefined};

export type CreateApiV3AiImageGenerationsBackgroundReplacementArgs = {body: ReplaceBackgroundRequest};

export type CreateApiV3AiImageGenerationsBackgroundReplacementOptions = {baseUrl: string, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const pendingImageGenerationResponse = z.object({generation_request_id: 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
};

/**
 * Replace the background of an existing image
 * 
 * POST /v3/ai/image-generations/background-replacement
 * 
 * Also accepts auth: OAuth2
 */
export const createApiV3AiImageGenerationsBackgroundReplacement = async (args: CreateApiV3AiImageGenerationsBackgroundReplacementArgs, options: CreateApiV3AiImageGenerationsBackgroundReplacementOptions) => {
const {baseUrl, fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

if (ApiKey !== undefined) headers.set("Api-Key", ApiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/ai/image-generations/background-replacement${query.size > 0 ? `?${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(pendingImageGenerationResponse, await res.json())
};