use anyhow::Result;

use crate::git;

use super::helpers::{require_session, teardown_session};

pub async fn action(branch: &str, force: bool) -> Result<()> {
    let (root, session) = require_session(branch).await;

    if git::is_dirty(&session.worktree).await {
        crate::fmt::die(&format!(
            "Branch \"{branch}\" has unsaved changes. Run \"sandlot save {branch}\" first."
        ));
    }

    if !force && git::is_dirty(&root).await {
        crate::fmt::die(
            "Working tree has uncommitted changes that may conflict with checkout. Commit or stash them first, or use -f to force.",
        );
    }

    teardown_session(&root, branch, &session.worktree).await;

    git::checkout(branch, &root).await?;

    println!("\u{2714} Checked out {branch}");
    Ok(())
}