// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// OpenEthereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with OpenEthereum.  If not, see <http://www.gnu.org/licenses/>.

//! Simple VM output.

use super::config::Config;
use bytes::ToPretty;
use ethcore::trace;

use display;
use info as vm;

/// Simple formatting informant.
#[derive(Default)]
pub struct Informant {
    config: Config,
}

impl Informant {
    pub fn new(config: Config) -> Informant {
        Informant { config }
    }
}

impl vm::Informant for Informant {
    type Sink = Config;

    fn before_test(&mut self, name: &str, action: &str) {
        println!("Test: {} ({})", name, action);
    }

    fn clone_sink(&self) -> Self::Sink {
        self.config
    }

    fn finish(result: vm::RunResult<Self::Output>, _sink: &mut Self::Sink) {
        match result {
            Ok(success) => {
                println!("Output: 0x{}", success.output.to_hex());
                println!("Gas used: {:x}", success.gas_used);
                println!("Time: {}", display::format_time(&success.time));
            }
            Err(failure) => {
                println!("Error: {}", failure.error);
                println!("Time: {}", display::format_time(&failure.time));
            }
        }
    }
}

impl trace::VMTracer for Informant {
    type Output = ();

    fn prepare_subtrace(&mut self, _code: &[u8]) {
        Default::default()
    }
    fn done_subtrace(&mut self) {}
    fn drain(self) -> Option<()> {
        None
    }
}