import {z} from 'zod'

export type RelaySelection = {type?: ('header' | 'json' | 'form') | undefined, role?: string | undefined, selector: string};

export type RelayAction = {action: 'encrypt' | 'decrypt', selections: Array<RelaySelection>};

export type RelayRoute = {method?: ('GET' | 'HEAD' | 'POST' | 'PUT' | 'DELETE' | 'PATCH') | undefined, path: string, request: Array<RelayAction>, response: Array<RelayAction>};

export type CreateApiRelaysArgs = {body: {destinationDomain: string, routes: Array<RelayRoute>, encryptEmptyStrings?: boolean | undefined, authentication?: ('api-key' | 'null' | null) | undefined}};

export type CreateApiRelaysOptions = {baseUrl?: string | undefined, ApiKey?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const relaySelection = z.object({type: z.enum(["header", "json", "form"]).optional(), role: z.string().optional(), selector: z.string()});

export const relayAction = z.object({action: z.enum(["encrypt", "decrypt"]), selections: z.array(relaySelection)});

export const relayRoute = z.object({method: z.enum(["GET", "HEAD", "POST", "PUT", "DELETE", "PATCH"]).optional(), path: z.string(), request: z.array(relayAction), response: z.array(relayAction)});

export const relay = z.object({id: z.string(), destinationDomain: z.string(), evervaultDomain: z.string(), routes: z.array(relayRoute), authentication: z.enum(["api-key", "null"]).nullable(), encryptEmptyStrings: z.boolean(), app: z.string(), createdAt: z.number().int(), updatedAt: z.number().int()});

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
};

/**
 * Create a Relay
 * 
 * POST /relays
 */
export const createApiRelays = async (args: CreateApiRelaysArgs, options?: CreateApiRelaysOptions) => {
const {baseUrl = "https://api.evervault.com", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

if (ApiKey !== undefined) headers.set('authorization', `Basic ${btoa(`${ApiKey.username}:${ApiKey.password}`)}`)

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