import {z} from 'zod'

export type ImageDataFormat = 'url' | 'base64';

export type ReferType = string;

export type ImageSubjectReference = {type: ReferType, image_file: string};

export type ImageStyleType = '漫画' | '元气' | '中世纪' | '水彩';

export type ImageStyle = {type: ImageStyleType, weight?: number | undefined};

export type ImageGenerationReq = {prompt: string, model: string, prompt_optimizer?: boolean | undefined, seed?: number | undefined, aspect_ratio?: string | undefined, response_format?: ImageDataFormat | undefined, n?: number | undefined, metadata?: {[key: string]: string} | undefined, subject_reference?: Array<ImageSubjectReference> | undefined, style?: ImageStyle | undefined, width?: number | undefined, height?: number | undefined, aigc_watermark?: boolean | undefined};

export type CreateApiV1ImageGenerationArgs = {body: ImageGenerationReq};

export type CreateApiV1ImageGenerationOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const imageObject = z.object({image_urls: z.array(z.string()).optional(), image_base64: z.array(z.string()).optional()});

export const imageGenerationResp = z.object({id: z.string().optional(), data: imageObject.optional(), metadata: z.record(z.string(), 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
};

/**
 * Image Generation
 * 
 * POST /v1/image_generation
 */
export const createApiV1ImageGeneration = async (args: CreateApiV1ImageGenerationArgs, options?: CreateApiV1ImageGenerationOptions) => {
const {baseUrl = "https://api.minimax.io", 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 (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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