use crate::error::CommandError;

use clap::Arg;

use clap::ArgGroup;

use hg::operations::{debug_data, DebugDataKind};

use micro_timer::timed;

pub const HELP_TEXT: &str = "

Dump the contents of a data file revision

";

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

    clap::SubCommand::with_name("debugdata")

        .arg(

            Arg::with_name("changelog")

                .help("open changelog")

                .short("-c")

                .long("--changelog"),

        )

        .arg(

            Arg::with_name("manifest")

                .help("open manifest")

                .short("-m")

                .long("--manifest"),

        )

        .group(

            ArgGroup::with_name("")

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

                .required(true),

        )

        .arg(

            Arg::with_name("rev")

                .help("revision")

                .required(true)

                .value_name("REV"),

        )

        .about(HELP_TEXT)

}

#[timed]

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

    let args = invocation.subcommand_args;

    let rev = args

        .value_of("rev")

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

    let kind =

        match (args.is_present("changelog"), args.is_present("manifest")) {

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

            (false, true) => DebugDataKind::Manifest,

            (true, true) => {

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

            }

            (false, false) => {

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

            }

        };

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

    stdout.write_all(&data)?;

    stdout.flush()?;

    Ok(())

}