import { TRPCError } from "@trpc/server";
import { and, eq, or } from "drizzle-orm";
import { workspaces, workspaceMembers } from "@tasks/database/schema";
import { db as defaultDb } from "@tasks/database";

/**
 * Cheap UUID v4-ish detector. We only need to differentiate "this looks like a
 * UUID" from "this looks like a slug" so the resolver can pick the right column.
 */
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

export type WorkspaceContext = {
  id: string;
  slug: string;
  name: string;
  ownerUserId: string;
  /** Caller's role inside the workspace, or "owner" if they own it directly. */
  role: string;
};

/**
 * Resolve a workspace handle (UUID or slug) to a full workspace record AND
 * authorize the caller against it. Throws NOT_FOUND if the handle doesn't
 * resolve, FORBIDDEN if the user isn't a member or owner.
 *
 * Used by the `workspaceProcedure` middleware and by Server Components at the
 * `app/(app)/[workspaceSlug]/...` layout boundary.
 */
export async function resolveWorkspace(args: {
  handle: string;
  userId: string;
  db?: typeof defaultDb;
}): Promise<WorkspaceContext> {
  const db = args.db ?? defaultDb;
  const handle = args.handle.trim();
  if (!handle) {
    throw new TRPCError({ code: "BAD_REQUEST", message: "Workspace handle required" });
  }

  const lookupCondition = UUID_RE.test(handle)
    ? eq(workspaces.id, handle)
    : eq(workspaces.slug, handle);

  const [row] = await db
    .select({
      id: workspaces.id,
      slug: workspaces.slug,
      name: workspaces.name,
      ownerUserId: workspaces.ownerUserId,
      memberRole: workspaceMembers.role,
    })
    .from(workspaces)
    .leftJoin(
      workspaceMembers,
      and(
        eq(workspaceMembers.workspaceId, workspaces.id),
        eq(workspaceMembers.userId, args.userId),
      ),
    )
    .where(lookupCondition)
    .limit(1);

  if (!row) {
    throw new TRPCError({ code: "NOT_FOUND", message: "Workspace not found" });
  }

  const isOwner = row.ownerUserId === args.userId;
  if (!isOwner && !row.memberRole) {
    throw new TRPCError({ code: "FORBIDDEN", message: "Not a member of this workspace" });
  }

  return {
    id: row.id,
    slug: row.slug,
    name: row.name,
    ownerUserId: row.ownerUserId,
    role: isOwner ? "owner" : (row.memberRole ?? "member"),
  };
}

/**
 * Look up a workspace by either UUID or slug WITHOUT authorizing the caller.
 * Used for the public form-fill flow and for routes that explicitly want to
 * peek at workspace existence (e.g. URL backcompat redirects).
 */
export async function findWorkspaceByHandle(
  handle: string,
  db = defaultDb,
): Promise<{ id: string; slug: string; name: string } | null> {
  const cleaned = handle.trim();
  if (!cleaned) return null;
  const cond = UUID_RE.test(cleaned)
    ? eq(workspaces.id, cleaned)
    : eq(workspaces.slug, cleaned);
  const [row] = await db
    .select({ id: workspaces.id, slug: workspaces.slug, name: workspaces.name })
    .from(workspaces)
    .where(cond)
    .limit(1);
  return row ?? null;
}

export { UUID_RE as WORKSPACE_HANDLE_UUID_RE };