import {z} from 'zod'

export type BackgroundMode = 'white_background' | 'transparent_background' | 'custom_background' | 'generative_background';

export type BackgroundRemovalRequest = {image_url?: string | undefined, image_base64?: string | undefined, background?: BackgroundMode | undefined, background_url?: string | undefined, layout?: ('center' | 'crop' | 'none') | undefined, effect?: ('shadow' | 'none') | undefined, background_prompt?: string | undefined, background_negative_prompt?: string | undefined, plate_replacement?: ('image' | 'none') | undefined, plate_base64?: string | undefined};

export type CreateApiV2RemoveBackgroundArgs = {body: BackgroundRemovalRequest};

export type CreateApiV2RemoveBackgroundOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiV2RemoveBackgroundResponse = z.object({output_url: z.string().optional(), error: z.string().optional(), error_description: z.string().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
};

/**
 * Vehicle Background Removal API (upload / base64 / custom background)
 * 
 * POST /v2/remove-background
 */
export const createApiV2RemoveBackground = async (args: CreateApiV2RemoveBackgroundArgs, options?: CreateApiV2RemoveBackgroundOptions) => {
const {baseUrl = "https://api.vinaudit.com", 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) query.set("key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/remove-background${query.size > 0 ? `?${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(createApiV2RemoveBackgroundResponse, await res.json())
};