use crate::error::CommandError;

use clap::Arg;

use clap::ArgGroup;

use hg::operations::debug_data;

use hg::revlog::RevlogType;

pub const HELP_TEXT: &str = "

Dump the contents of a data file revision

";

pub fn args() -> clap::Command {

    clap::command!("debugdata")

        .arg(

            Arg::new("changelog")

                .help("open changelog")

                .short('c')

                .action(clap::ArgAction::SetTrue),

        )

        .arg(

            Arg::new("manifest")

                .help("open manifest")

                .short('m')

                .action(clap::ArgAction::SetTrue),

        )

        .group(

            ArgGroup::new("revlog")

                .args(["changelog", "manifest"])

                .required(true),

        )

        .arg(

            Arg::new("rev")

                .help("revision")

                .required(true)

                .value_name("REV"),

        )

        .about(HELP_TEXT)

}

#[logging_timer::time("trace")]

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

    let args = invocation.subcommand_args;

    let rev = args

        .get_one::<String>("rev")

        .expect("rev should be a required argument");

    let kind = match (

        args.get_one::<bool>("changelog").unwrap(),

        args.get_one::<bool>("manifest").unwrap(),

    ) {

        (true, false) => RevlogType::Changelog,

        (false, true) => RevlogType::Manifestlog,

        (true, true) => {

            unreachable!("Should not happen since options are exclusive")

        }

        (false, false) => {

            unreachable!("Should not happen since options are required")

        }

    };

    let repo = invocation.repo?;

    if repo.has_narrow() {

        return Err(CommandError::unsupported(

            "support for ellipsis nodes is missing and repo has narrow enabled",

        ));

    }

    let data = debug_data(repo, rev, kind)?;

    let mut stdout = invocation.ui.stdout_buffer();

    stdout.write_all(&data)?;

    stdout.flush()?;

    Ok(())

}