import {z} from 'zod'

export type GetApiCpeArgs = {cpe: string, isVulnerable?: string | undefined};

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

export const apiCPE = z.object({edition: z.string().optional(), language: z.string().optional(), other: z.string().optional(), part: z.string().optional(), product: z.string().optional(), sw_edition: z.string().optional(), target_hw: z.string().optional(), target_sw: z.string().optional(), update: z.string().optional(), vendor: z.string().optional(), version: z.string().optional()});

export const v3controllersResponseMetadata = z.object({cpe: z.string().optional(), cpe_struct: apiCPE.optional(), timestamp: z.string().optional(), total_documents: z.number().int().optional()});

export const renderResponseWithMetadataArrayStringV3controllersResponseMetadata = z.object({_benchmark: z.number().optional(), _meta: v3controllersResponseMetadata.optional(), data: z.array(z.string()).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
};

/**
 * Return CVE 's associated with a specific NIST CPE
 * 
 * GET /cpe
 */
export const getApiCpe = async (args: GetApiCpeArgs, options: GetApiCpeOptions) => {
const {baseUrl, fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (args.cpe != null) query.append("cpe", String(args.cpe))
if (args.isVulnerable != null) query.append("isVulnerable", String(args.isVulnerable))
if (Bearer !== undefined) headers.set("Authorization", Bearer)

const url = `${baseUrl.replace(/\/+$/, '')}/cpe${query.size > 0 ? `?${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(renderResponseWithMetadataArrayStringV3controllersResponseMetadata, await res.json())
};