// 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/>.

use std::{
    io,
    path::{Path, PathBuf},
};

use ansi_term::Colour::White;
use ethcore_logger::Config as LogConfig;
use parity_rpc;
use path::restrict_permissions_owner;
use rpc;
use rpc_apis;

pub const CODES_FILENAME: &'static str = "authcodes";

pub struct NewToken {
    pub token: String,
    pub message: String,
}

pub fn new_service(
    ws_conf: &rpc::WsConfiguration,
    logger_config: &LogConfig,
) -> rpc_apis::SignerService {
    let logger_config_color = logger_config.color;
    let signer_path = ws_conf.signer_path.clone();
    let signer_enabled = ws_conf.support_token_api;

    rpc_apis::SignerService::new(
        move || {
            generate_new_token(&signer_path, logger_config_color).map_err(|e| format!("{:?}", e))
        },
        signer_enabled,
    )
}

pub fn codes_path(path: &Path) -> PathBuf {
    let mut p = path.to_owned();
    p.push(CODES_FILENAME);
    let _ = restrict_permissions_owner(&p, true, false);
    p
}

pub fn execute(ws_conf: rpc::WsConfiguration, logger_config: LogConfig) -> Result<String, String> {
    Ok(generate_token_and_url(&ws_conf, &logger_config)?.message)
}

pub fn generate_token_and_url(
    ws_conf: &rpc::WsConfiguration,
    logger_config: &LogConfig,
) -> Result<NewToken, String> {
    let code = generate_new_token(&ws_conf.signer_path, logger_config.color)
        .map_err(|err| format!("Error generating token: {:?}", err))?;
    let colored = |s: String| match logger_config.color {
        true => format!("{}", White.bold().paint(s)),
        false => s,
    };

    Ok(NewToken {
        token: code.clone(),
        message: format!(
            r#"
Generated token:
{}
"#,
            colored(code)
        ),
    })
}

fn generate_new_token(path: &Path, logger_config_color: bool) -> io::Result<String> {
    let path = codes_path(path);
    let mut codes = parity_rpc::AuthCodes::from_file(&path)?;
    codes.clear_garbage();
    let code = codes.generate_new()?;
    codes.to_file(&path)?;
    trace!(
        "New key code created: {}",
        match logger_config_color {
            true => format!("{}", White.bold().paint(&code[..])),
            false => format!("{}", &code[..]),
        }
    );
    Ok(code)
}