import {z} from 'zod'

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

export const zoneName = z.enum(["ch-dk-2", "de-muc-1", "ch-gva-2", "at-vie-1", "de-fra-1", "bg-sof-1", "at-vie-2", "hr-zag-1"]);

export const instanceType = z.object({id: z.string().optional(), size: z.enum(["large", "huge", "jumbo", "medium", "mega", "small", "extra-large", "titan48c", "titan", "micro", "colossus", "tiny"]).optional(), family: z.enum(["gpu3", "gpua30", "gpu3080ti", "gpu2", "gpu", "memory", "gpua5000", "gpub300", "gpurtx6000pro", "storage", "standard", "colossus", "cpu"]).optional(), cpus: z.number().int().gt(0).optional(), gpus: z.number().int().gt(0).optional(), authorized: z.boolean().optional(), memory: z.number().int().gt(0).optional(), zones: z.array(zoneName).optional()});

export const getApiInstanceTypeResponse = z.object({"instance-types": z.array(instanceType).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
};

/**
 * List Compute instance Types
 * 
 * GET /instance-type
 */
export const getApiInstanceType = async (options?: GetApiInstanceTypeOptions) => {
const {baseUrl = "https://api-ch-gva-2.exoscale.com/v2", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/instance-type${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(getApiInstanceTypeResponse, await res.json())
};