import {z} from 'zod'

export type SDXLStyles = 'base' | 'cinematic' | 'photographic' | 'Advertising';

export type CreativeGeneratorRequest = {height?: (number | null) | undefined, loras?: ({[key: string]: number} | null) | undefined, negative_prompt?: (string | null) | undefined, num_images?: number | undefined, product_image_b64: string, prompt: string, rotate_deg?: number | undefined, seed?: (number | Array<number | null> | null) | undefined, style_preset?: (SDXLStyles | null) | undefined, target_product_height_px: number, width?: (number | null) | undefined};

export type CreateApiCreativeGeneratorArgs = {body: CreativeGeneratorRequest};

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

export const generatedImage = z.object({image_b64: z.string(), seed: z.number().int()});

export const creativeGeneratorResponse = z.object({images: z.array(generatedImage)});

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
};

/**
 * Creative Generator
 * 
 * POST /creative-generator
 */
export const createApiCreativeGenerator = async (args: CreateApiCreativeGeneratorArgs, options?: CreateApiCreativeGeneratorOptions) => {
const {baseUrl = "https://image.octoai.run", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/creative-generator${query.size > 0 ? `?${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(creativeGeneratorResponse, await res.json())
};