import {z} from 'zod'

export type StyleMatch = 'regular' | 'precise' | 'flexible';

export type MixPolicy = 'PaletteMatch' | 'MaxWeight';

export type TransformModel = 'recraftv2' | 'recraftv2_raster' | 'recraftv2_vector' | 'recraftv3' | 'recraftv3_raster' | 'recraftv3_vector' | 'recraftv4' | 'recraftv4_raster' | 'recraftv4_vector' | 'recraftv4_pro' | 'recraftv4_pro_raster' | 'recraftv4_pro_vector' | 'recraftv4_1' | 'recraftv4_1_raster' | 'recraftv4_1_vector' | 'recraftv4_1_pro' | 'recraftv4_1_pro_raster' | 'recraftv4_1_pro_vector' | 'recraftv4_1_utility' | 'recraftv4_1_utility_raster' | 'recraftv4_1_utility_vector' | 'recraftv4_1_utility_pro' | 'recraftv4_1_utility_pro_raster' | 'recraftv4_1_utility_pro_vector' | 'recraftv4_styles' | 'recraftv4_styles_raster' | 'recraftv4_styles_vector' | 'recraftv4_styles_pro' | 'recraftv4_styles_pro_raster' | 'recraftv4_styles_pro_vector' | 'recraftv4_1_flash' | 'recraftv4_1_flash_raster';

export type ImageColor = {rgb?: Array<number> | undefined, std?: Array<number> | undefined, weight?: number | undefined};

export type PaletteSuggest = {background_color?: ImageColor | undefined, colors: Array<ImageColor>};

export type ImageStyle = 'any' | 'digital_illustration' | 'icon' | 'realistic_image' | 'vector_illustration' | 'logo_raster';

export type CreateApiV1StylesArgs = {body: {image_weights?: Array<number> | undefined, match?: StyleMatch | undefined, mix_policy?: MixPolicy | undefined, model?: TransformModel | undefined, palette?: PaletteSuggest | undefined, private?: boolean | undefined, prompt?: string | undefined, source_style_weights?: Array<number> | undefined, source_styles?: Array<string> | undefined, style?: ImageStyle | undefined, image_urls?: Array<string> | undefined}};

export type CreateApiV1StylesOptions = {baseUrl?: string | undefined, auth0?: string | undefined, fetch?: typeof fetch | undefined};

export const imageStyle = z.enum(["any", "digital_illustration", "icon", "realistic_image", "vector_illustration", "logo_raster"]);

export const createStyleResponse = z.object({creation_time: z.string(), id: z.string(), is_private: z.boolean(), style: imageStyle, credits: z.number().int()});

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
};

/**
 * Create Style
 * 
 * POST /v1/styles
 */
export const createApiV1Styles = async (args: CreateApiV1StylesArgs, options?: CreateApiV1StylesOptions) => {
const {baseUrl = "https://external.api.recraft.ai", fetch: fetchFn = fetch, auth0} = options ?? {}

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

if (auth0 !== undefined) headers.set('authorization', `Bearer ${auth0}`)

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