import {z} from 'zod'

export type IntegrationType = 'github' | 'slack';

export type GetApiIntegrationsArgs = {integration_type?: (IntegrationType | null) | undefined};

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

export const gitHubInstall = z.object({integration_type: z.literal("github").optional(), installation_id: z.number().int(), account_login: z.string().nullable().optional(), status: z.string()});

export const slackInstall = z.object({integration_type: z.literal("slack").optional(), slack_team_id: z.string(), team_name: z.string().nullable().optional(), status: z.string()});

export const listIntegrationsResponse = z.object({items: z.array(z.union([gitHubInstall, slackInstall]))});

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 Integrations
 * 
 * GET /integrations
 */
export const getApiIntegrations = async (args: GetApiIntegrationsArgs, options: GetApiIntegrationsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

if (args.integration_type != null) query.append("integration_type", String(args.integration_type))
if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

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