import {z} from 'zod'

export type GetApiRegionsOptimalArgs = {cdnServerToken?: string | undefined, gpuType?: string | undefined, gpuCount?: number | undefined};

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

export const region = z.object({id: z.string().optional(), name: z.string().optional(), group: z.string().optional(), hasAnycastSupport: z.boolean().optional(), hasCapacity: z.boolean().optional(), gpuTypes: z.array(z.string()).optional()});

export const optimalBaseRegionResponse = z.object({region: region.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
};

/**
 * Get Optimal Base Region
 * 
 * GET /regions/optimal
 */
export const getApiRegionsOptimal = async (args: GetApiRegionsOptimalArgs, options?: GetApiRegionsOptimalOptions) => {
const {baseUrl = "https://api.bunny.net/mc", fetch: fetchFn = fetch, AccessKey} = options ?? {}

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

if (args.cdnServerToken != null) query.append("cdnServerToken", String(args.cdnServerToken))
if (args.gpuType != null) query.append("gpuType", String(args.gpuType))
if (args.gpuCount != null) query.append("gpuCount", String(args.gpuCount))
if (AccessKey !== undefined) headers.set("AccessKey", AccessKey)

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