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/*
rss2tg
Copyright (C) 2017  ejiek

This program 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.

This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/
extern crate toml;

use std::fs::File;
use std::io::prelude::*;
use std::error;
use std::fmt;

/// Not enough arguments error
#[derive(Debug, Clone)]
struct NotEnoughArguments;

impl fmt::Display for NotEnoughArguments {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "not enough arguments")
    }
}

impl error::Error for NotEnoughArguments {
    fn description(&self) -> &str {
        "not enough arguments "
    }

    fn cause(&self) -> Option<&error::Error> {
        // Generic error, underlying cause isn't tracked.
        None
    }
}

pub use subscription::Subscription;

/// Represent arguments from command line and global values from config file
#[derive(Debug, Deserialize)]
pub struct Config {
    /// Path to file which holds last recieved item's guid in case its not
    /// specified in subscription.
    global_last_guid_file: Option<String>,
    /// Vector for storing subscriptions.
    subscriptions: Vec<Subscription>,
}

impl Config {
    pub fn new(args: &[String]) -> Result<Config, Box<error::Error>> {
        if args.len() < 2 {
            return Err(NotEnoughArguments.into());
        }
        let mut f = File::open(&args[1])?;
        let mut toml_str = String::new();
        f.read_to_string(&mut toml_str)?;
        Ok(toml::from_str(toml_str.as_str()).unwrap())
    }

    pub fn subscriptions(&self) -> &Vec<Subscription> {
        &self.subscriptions
    }
}