import {z} from 'zod'

export type PartialImages = number | null;

export type CreateImageRequest = {prompt: string, model?: (string | 'gpt-image-1.5' | 'dall-e-2' | 'dall-e-3' | 'gpt-image-1' | 'gpt-image-1-mini' | null) | undefined, n?: (number | null) | undefined, quality?: ('standard' | 'hd' | 'low' | 'medium' | 'high' | 'auto' | null) | undefined, response_format?: ('url' | 'b64_json' | null) | undefined, output_format?: ('png' | 'jpeg' | 'webp' | null) | undefined, output_compression?: (number | null) | undefined, stream?: (boolean | null) | undefined, partial_images?: PartialImages | undefined, size?: (string | 'auto' | '1024x1024' | '1536x1024' | '1024x1536' | '256x256' | '512x512' | '1792x1024' | '1024x1792' | null) | undefined, moderation?: ('low' | 'auto' | null) | undefined, background?: ('transparent' | 'opaque' | 'auto' | null) | undefined, style?: ('vivid' | 'natural' | null) | undefined, user?: string | undefined};

export type CreateApiV1ImagesGenerationsArgs = {body: CreateImageRequest};

export type CreateApiV1ImagesGenerationsOptions = {baseUrl?: string | undefined, gatewayBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const image = z.object({b64_json: z.string().optional(), url: z.string().optional(), revised_prompt: z.string().optional()});

export const imageGenOutputTokensDetails = z.object({image_tokens: z.number().int(), text_tokens: z.number().int()});

export const imageGenInputUsageDetails = z.object({text_tokens: z.number().int(), image_tokens: z.number().int()});

export const imageGenUsage = z.object({input_tokens: z.number().int(), total_tokens: z.number().int(), output_tokens: z.number().int(), output_tokens_details: imageGenOutputTokensDetails.optional(), input_tokens_details: imageGenInputUsageDetails});

export const imagesResponse = z.object({created: z.number().int(), data: z.array(image).optional(), background: z.enum(["transparent", "opaque"]).optional(), output_format: z.enum(["png", "webp", "jpeg"]).optional(), size: z.enum(["1024x1024", "1024x1536", "1536x1024"]).optional(), quality: z.enum(["low", "medium", "high"]).optional(), usage: imageGenUsage.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
};

/**
 * /v1/images/generations
 * 
 * POST /v1/images/generations
 */
export const createApiV1ImagesGenerations = async (args: CreateApiV1ImagesGenerationsArgs, options?: CreateApiV1ImagesGenerationsOptions) => {
const {baseUrl = "https://aihubmix.com", fetch: fetchFn = fetch, gatewayBearer} = options ?? {}

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

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

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