use crate::error::CommandError;

use crate::ui::Ui;

use clap::Arg;

use hg::operations::list_rev_tracked_files;

use hg::operations::Dirstate;

use hg::repo::Repo;

use hg::utils::files::{get_bytes_from_path, relativize_path};

use hg::utils::hg_path::{HgPath, HgPathBuf};

pub const HELP_TEXT: &str = "

List tracked files.

Returns 0 on success.

";

pub fn args() -> clap::App<'static, 'static> {

    clap::SubCommand::with_name("files")

        .arg(

            Arg::with_name("rev")

                .help("search the repository as it is in REV")

                .short("-r")

                .long("--revision")

                .value_name("REV")

                .takes_value(true),

        )

        .about(HELP_TEXT)

}

pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {

    let rev = invocation.subcommand_args.value_of("rev");

    let repo = invocation.repo?;

    if let Some(rev) = rev {

        let files = list_rev_tracked_files(repo, rev).map_err(|e| (e, rev))?;

        display_files(invocation.ui, repo, files.iter())

    } else {

        let distate = Dirstate::new(repo)?;

        let files = distate.tracked_files()?;

        display_files(invocation.ui, repo, files)

    }

}

fn display_files<'a>(

    ui: &Ui,

    repo: &Repo,

    files: impl IntoIterator<Item = &'a HgPath>,

) -> Result<(), CommandError> {

    let cwd = HgPathBuf::from(get_bytes_from_path(hg::utils::current_dir()?));

    let working_directory =

        HgPathBuf::from(get_bytes_from_path(repo.working_directory_path()));

    let mut stdout = ui.stdout_buffer();

    for file in files {

        let file = working_directory.join(file);

        stdout.write_all(relativize_path(&file, &cwd).as_ref())?;

        stdout.write_all(b"\n")?;

    }

    stdout.flush()?;

    Ok(())

}