// Copyright 2017 The Grin Developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Public types for config modules

use std::path::PathBuf;
use std::io;
use std::fmt;

use grin::ServerConfig;
use pow::types::MinerConfig;

/// Error type wrapping config errors.
#[derive(Debug)]
pub enum ConfigError {
    /// Error with parsing of config file
    ParseError (String, String),

    /// Error with fileIO while reading config file
    FileIOError (String, String),

    /// No file found
    FileNotFoundError (String),

    /// Error serializing config values
    SerializationError (String),
}

impl fmt::Display for ConfigError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            ConfigError::ParseError(ref file_name, ref message) => {
                write!(f, "Error parsing configuration file at {} - {}",file_name, message)
            }
            ConfigError::FileIOError(ref file_name, ref message) => {
                write!(f, "{} {}", message, file_name)
            }
            ConfigError::FileNotFoundError(ref file_name) => {
                write!(f, "Configuration file not found: {}", file_name)
            }
            ConfigError::SerializationError(ref message) => {
                write!(f, "Error serializing configuration: {}", message)
            }
        }
    }
}

impl From<io::Error> for ConfigError {
    fn from(error: io::Error) -> ConfigError {
        ConfigError::FileIOError(
            String::from(""),
            String::from(format!("Error loading config file: {}",error)),
        )
    }
}

/// Going to hold all of the various configuration types
/// separately for now, then put them together as a single
/// ServerConfig object afterwards. This is to flatten
/// out the configuration file into logical sections,
/// as they tend to be quite nested in the code
/// Most structs optional, as they may or may not
/// be needed depending on what's being run

#[derive(Debug, Serialize, Deserialize)]
pub struct GlobalConfig {
    ///Keep track of the file we've read
    pub config_file_path: Option<PathBuf>,
    /// keep track of whether we're using
    /// a config file or just the defaults
    /// for each member
    pub using_config_file: bool,
    /// Global member config
    pub members: Option<ConfigMembers>,
}

/// Keeping an 'inner' structure here, as the top
/// level GlobalConfigContainer options might want to keep
/// internal state that we don't necessarily
/// want serialised or deserialised

#[derive(Debug, Serialize, Deserialize)]
pub struct ConfigMembers {
    /// Server config
    pub server: ServerConfig,
    /// Mining config
    pub mining: Option<MinerConfig>,
    //removing wallet from here for now,
    //as its concerns are separate from the server's, really
    //given it needs to manage keys. It should probably
    //stay command line only for the time being
    //pub wallet: Option<WalletConfig>
}