/**
 * Workspace token resolver — server-only helper.
 *
 * Cycle 7 — extracted from `src/actions/smartsheet/workspace.ts` to
 * avoid a `"use server"` leak: every async export of a "use server"
 * file is reachable as a server action RPC, and we don't want this
 * function callable from the client (it returns the plaintext API
 * token). Living in a regular module means it's only importable from
 * other server code (`smartsheet-sync.ts`, `time-tracking-smartsheet-
 * sync.ts`) — the client surface is in the workspace actions file,
 * which gates with `requireManageSettings` and never returns
 * plaintext.
 */
import "server-only";
import { eq } from "drizzle-orm";
import { withBrand } from "@/db/client";
import { smartsheetWorkspace } from "@/db/schema/smartsheet-workspace";
import { decryptToken } from "@/lib/crypto";

export type ResolvedWorkspaceToken =
  | { ok: true; token: string }
  | { ok: false; reason: "no_workspace" }
  | { ok: false; reason: "connection_disabled" }
  | { ok: false; reason: "decryption_failed"; error: string };

export async function resolveWorkspaceToken(
  brandId: string,
): Promise<ResolvedWorkspaceToken> {
  return withBrand(brandId, async (db) => {
    const rows = await db
      .select()
      .from(smartsheetWorkspace)
      .where(eq(smartsheetWorkspace.brandId, brandId))
      .limit(1);
    const ws = rows[0];
    if (!ws) return { ok: false, reason: "no_workspace" };
    if (!ws.connectionEnabled) return { ok: false, reason: "connection_disabled" };
    try {
      const token = decryptToken({
        cipher: ws.encryptedApiToken,
        iv: ws.tokenIv,
        authTag: ws.tokenAuthTag,
      });
      return { ok: true, token };
    } catch (err) {
      return {
        ok: false,
        reason: "decryption_failed",
        error: err instanceof Error ? err.message : String(err),
      };
    }
  });
}