import * as git from "../git.ts"
import { die } from "../fmt.ts"
import { requireSession, teardownSession } from "./helpers.ts"

export async function action(branch: string, opts: { force?: boolean } = {}) {
  const { root, session } = await requireSession(branch)

  if (await git.isDirty(session.worktree)) {
    die(`Branch "${branch}" has unsaved changes. Run "sandlot save ${branch}" first.`)
  }

  if (!opts.force && await git.isDirty(root)) {
    die(`Working tree has uncommitted changes that may conflict with checkout. Commit or stash them first, or use -f to force.`)
  }

  await teardownSession(root, branch, session.worktree)

  await git.checkout(branch, root)

  console.log(`✔ Checked out ${branch}`)
}