import {z} from 'zod'

export type GetApiServerArgs = {'X-Postmark-Server-Token': string};

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

export const serverConfigurationResponse = z.object({ID: z.number().int().optional(), Name: z.string().optional(), ApiTokens: z.array(z.string()).optional(), ServerLink: z.string().optional(), Color: z.enum(["purple", "blue", "turqoise", "green", "red", "yellow", "grey"]).optional(), InboundAddress: z.string().optional(), RawEmailEnabled: z.boolean().optional(), DeliveryHookUrl: z.string().optional(), SmtpApiActivated: z.boolean().optional(), InboundHookUrl: z.string().optional(), BounceHookUrl: z.string().optional(), OpenHookUrl: z.string().optional(), PostFirstOpenOnly: z.boolean().optional(), TrackOpens: z.boolean().optional(), TrackLinks: z.enum(["None", "HtmlAndText", "HtmlOnly", "TextOnly"]).optional(), ClickHookUrl: z.string().optional(), InboundDomain: z.string().optional(), InboundHash: z.string().optional(), InboundSpamThreshold: 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
};

/**
 * Get Server Configuration
 * 
 * GET /server
 */
export const getApiServer = async (args: GetApiServerArgs, options: GetApiServerOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args['X-Postmark-Server-Token'] != null) headers.set("X-Postmark-Server-Token", String(args['X-Postmark-Server-Token']))

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