import {z} from 'zod'

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

export const gPUResources = z.object({count: z.number().int().gte(0)});

export const hardwareResources = z.object({gpus: z.record(z.string(), gPUResources), vcpu_count: z.number().int().gte(0), ram_gb: z.number().int().gte(0), storage_gb: z.number().int().gte(0)});

export const schemasVirtualMachinesInstantVmLocationInstantDeployPreset = z.object({id: z.string(), resources: hardwareResources, operating_system: z.enum(["Ubuntu 20.04 LTS", "Ubuntu 22.04 LTS", "TensorML 20 TensorFlow", "TensorML 20 PyTorch", "TensorML 20 Everything", "Ubuntu 24.04 LTS", "TensorML 24 TensorFlow", "TensorML 24 PyTorch", "TensorML 24 Everything", "Windows 10"]), compute_rate_hourly: z.string(), storage_rate_hourly: z.string(), available_vms: z.number().int()});

export const instantDeployLocation = z.object({id: z.string(), available_presets: z.array(schemasVirtualMachinesInstantVmLocationInstantDeployPreset)});

export const paginatedResultInstantDeployLocation = z.object({results: z.array(instantDeployLocation), total_result_count: z.number().int().gte(0), has_previous: z.boolean(), has_next: z.boolean()});

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 available locations for instant VMs
 * 
 * GET /virtual-machines/instant/locations
 * 
 * Also accepts auth: APIKeyHeader
 */
export const getApiVirtualMachinesInstantLocations = async (options: GetApiVirtualMachinesInstantLocationsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, apiTokenAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/virtual-machines/instant/locations${query.size > 0 ? `?${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(paginatedResultInstantDeployLocation, await res.json())
};