// git restore-autosave
// - --user and --all-users cannot both be present
// - --branch and --all-branches cannot both be present
// - if --user or -u is not present, the selected user is the repository signature
// - if --branch or -b is not present, the selected branch is the checked out branch
// - if --device or -d is present (UUID or hostname), filter to autosaves from that device
// - filter to autosaves from the current user (name or email) if --all-users is not present
// - filter to autosaves on the current branch
// - filter to autosaves after the head commit
// - if there is more than one option, enter pick mode
// - if there are no options, tell the user to use --all-users or --all-branches or --anytime

use auth_git2::GitAuthenticator;
use git_autosave::{Config, authenticate::Inquirer, inquire::AutosaveFilters};
use git2::{RemoteCallbacks, Repository, build::CheckoutBuilder};

fn main() -> Result<(), anyhow::Error> {
	let all_users = std::env::args().any(|arg| arg == "--all-users");
	let all_branches = std::env::args().any(|arg| arg == "--all-branches");
	let all_devices = std::env::args().any(|arg| arg == "--all-devices");
	let anytime = std::env::args().any(|arg| arg == "--anytime");
	let force = std::env::args().any(|arg| arg == "--force");

	let repository = Repository::discover(".")?;
	let repo_id = git_autosave::repository_id(&repository)?;
	let signature = repository.signature()?;
	let branch = git_autosave::utils::current_branch(&repository)?;
	let earliest_time = repository.head()?.peel_to_commit()?.time();

	let gitconfig = repository.config()?;
	let config: &'static _ = Box::leak(Box::new(Config::load()?));
	let auth = GitAuthenticator::new().set_prompter(Inquirer(config));
	let mut callbacks = RemoteCallbacks::new();
	callbacks.credentials(auth.credentials(&gitconfig));
	git_autosave::fetch_autosaves(&repository, callbacks)?;

	let autosaves = git_autosave::autosaves(&repository)?;
	let autosaves = git_autosave::inquire::filter_autosaves(
		autosaves,
		AutosaveFilters {
			signature: &signature,
			branch: &branch,
			earliest_time,
			repo_id: &repo_id,
			all_users,
			all_branches,
			anytime,
			all_devices,
		},
	)
	.collect::<Vec<_>>();

	if autosaves.is_empty() {
		eprintln!("ERROR: There are no available autosaves for the given filters.");
		if !all_users || !all_branches || !anytime {
			eprintln!(
				"hint: Use --all-users, --all-branches, --all-devices, or --anytime to include more options."
			);
		}
		std::process::exit(1);
	}

	let autosave = git_autosave::inquire::select_autosave(autosaves, all_branches, all_users)?;
	let autosaved_commit = repository.find_commit(autosave.commit_id)?;
	let workdir = repository.find_tree(git_autosave::utils::workdir_to_tree(&repository)?)?;
	let new_tree =
		git_autosave::utils::merge_commit_with_tree(&repository, &autosaved_commit, &workdir)?;
	git_autosave::save_undo_tree(&repository, &workdir)?;
	git_autosave::saved_restored_autosave(&repository, &autosave)?;

	let mut options = CheckoutBuilder::new();
	if force {
		options.force();
	}
	repository.checkout_tree(
		&repository.find_object(new_tree, Some(git2::ObjectType::Tree))?,
		Some(&mut options),
	)?;

	Ok(())
}