import { ok, type CommandContext, type Result } from "@tailor-platform/erp-kit/core";
import type { Transaction } from "../generated/kysely-tailordb";
import { createStateToken } from "../lib/slackState";

export interface BeginSlackWorkspaceInstallInput {
  redirectUri?: string;
  clientId: string;
  /** Shared secret used to HMAC-sign the state token; the same value must be supplied to completeSlackWorkspaceInstall. */
  signingSecret: string;
}

type RunResult = Result<{ state: string; authorizeUrl: string }, never>;

export async function run(
  db: Transaction,
  input: BeginSlackWorkspaceInstallInput,
  ctx: CommandContext,
): Promise<RunResult> {
  void db;
  const state = await createStateToken(
    {
      userId: ctx.actorId,
      redirectUri: input.redirectUri,
    },
    input.signingSecret,
  );
  const params = new URLSearchParams({
    client_id: input.clientId,
    scope: "chat:write,channels:read",
    state,
  });
  if (input.redirectUri) {
    params.set("redirect_uri", input.redirectUri);
  }
  const authorizeUrl = `https://slack.com/oauth/v2/authorize?${params.toString()}`;
  return ok({ state, authorizeUrl });
}