import {z} from 'zod'

export type ApiResolution = '480p' | '720p' | '1080p' | '2k' | '4k';

export type ApiAspectRatio = '16:9' | '9:16' | '1:1';

export type GenerateVideoApiRequest = {prompt: string, model_id: string, resolution?: (ApiResolution | null) | undefined, aspect_ratio?: (ApiAspectRatio | null) | undefined, duration?: (number | null) | undefined, start_frame_image_id?: (string | null) | undefined, end_frame_image_id?: (string | null) | undefined, reference_image_ids?: Array<string> | undefined, reference_video_ids?: Array<string> | undefined, source_video_id?: (string | null) | undefined};

export type CreateApiVideoArgs = {body: GenerateVideoApiRequest};

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

export const createVideoJobResponse = z.object({job_id: z.string(), estimated_credits: z.number()});

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
};

/**
 * Generate a video
 * 
 * POST /video
 */
export const createApiVideo = async (args: CreateApiVideoArgs, options?: CreateApiVideoOptions) => {
const {baseUrl = "https://api.wondercraft.ai/v1", fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (APIKeyHeader !== undefined) headers.set("X-API-KEY", APIKeyHeader)

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