import {z} from 'zod'

export type GetApiPurlArgs = {purl: string};

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

export const purlQualifierJSON = z.object({key: z.string().optional(), value: z.string().optional()});

export const purlPackageURLJSON = z.object({name: z.string().optional(), namespace: z.string().optional(), qualifiers: z.array(purlQualifierJSON).optional(), subpath: z.string().optional(), type: z.string().optional(), version: z.string().optional()});

export const v3controllersPurlResponseMetadata = z.object({purl_struct: purlPackageURLJSON.optional(), timestamp: z.string().optional(), total_documents: z.number().int().optional()});

export const apiOSSPackageVulnerability = z.object({detection: z.string().optional(), fixed_version: z.string().optional()});

export const v3controllersPurlResponseData = z.object({cves: z.array(z.string()).optional(), vulnerabilities: z.array(apiOSSPackageVulnerability).optional()});

export const renderResponseWithMetadataV3controllersPurlResponseDataV3controllersPurlResponseMetadata = z.object({_benchmark: z.number().optional(), _meta: v3controllersPurlResponseMetadata.optional(), data: v3controllersPurlResponseData.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
};

/**
 * Request vulnerabilities related to a PURL
 * 
 * GET /purl
 */
export const getApiPurl = async (args: GetApiPurlArgs, options: GetApiPurlOptions) => {
const {baseUrl, fetch: fetchFn = fetch, Bearer} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/purl${query.size > 0 ? `?${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(renderResponseWithMetadataV3controllersPurlResponseDataV3controllersPurlResponseMetadata, await res.json())
};