import {z} from 'zod'

export type Snapshot = {vmId: string, ssId?: string | undefined, snapshot_type?: string | undefined, snapshot_path?: string | undefined, mem_file_path?: string | undefined, version?: string | undefined, record_regions?: boolean | undefined, size_threshold?: number | undefined, interval_threshold?: number | undefined};

export type CreateApiSnapshotsArgs = {body: Snapshot};

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

export const snapshot = z.object({vmId: z.string(), ssId: z.string().optional(), snapshot_type: z.string().optional(), snapshot_path: z.string().optional(), mem_file_path: z.string().optional(), version: z.string().optional(), record_regions: z.boolean().optional(), size_threshold: z.number().int().optional(), interval_threshold: z.number().int().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
};

/**
 * Take a snapshot
 * 
 * POST /snapshots
 */
export const createApiSnapshots = async (args: CreateApiSnapshotsArgs, options?: CreateApiSnapshotsOptions) => {
const {baseUrl = "http://localhost:8080", fetch: fetchFn = fetch} = options ?? {}

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

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