//! File: settings.rs
//! Description: Defines a stuct that holds all of the configuration settings passed to the program
//!              by  line.
//! Created On: Tue 04 Jun 2019 10:30:46 pm CEST
//! Last Modified: Tue 01 Oct 2019 09:52:47 pm CEST
//! Author: Jali <jali@orcacentral.de>

use clap::ArgMatches;
use std::str::FromStr;

/**
 * Stores the configuration needed for the server.
 */
pub struct Settings {
    pub foreground: bool,
    pub listen: String,
    pub plugins: Vec<String>,
    pub port: i32
}

impl Settings {
    /**
     * # Description
     *
     * Creates a new instance of a Settings object either from 
     * the command line, or the default configuration.
     *
     * # Returns 
     *
     * A new ```Settings``` object
     *
     * # Exanples
     *
     * ```rust
     * let settings = Settings::create();
     * ```
     */
    pub fn create() -> Settings {
            let matches = Settings::parse_command_line();

            Settings {
                foreground: matches.is_present("FOREGROUND"),
                listen: matches.value_of("LISTEN").unwrap_or("127.0.0.1").to_owned(),
                plugins: matches.value_of("PLUGIN").unwrap_or("filesystem").split(",").map(|s| s.to_string()).collect(),
                port: FromStr::from_str(matches.value_of("PORT").unwrap_or("70")).unwrap()
            }
    }


    /**
     * # Description
     * 
     * Parses the command line and returns all matches that fit the known  
     * options
     *
     * # returns
     * A collection of matches.
     */
     fn parse_command_line<'a>() -> ArgMatches<'a> {
         // Read the configuration from the command line
        clap_app!(myapp => 
            (version: "0.1")
            (author: "jali@orca-central.de")
            (about: "A simple modular gopher server, that pushes converted web-content to a client")
            (@arg FOREGROUND: -f --foreground "Keeps the service in the foreground")
            (@arg LISTEN: -l --listen +takes_value "Specifies the interface to listn on. Is either a hostname or an address-pattern.")
            (@arg PLUGIN: -u --plugins +takes_value +required "A comma separated list of plugins to load.")
            (@arg PORT: -p --port +takes_value "Specifies the port the server listens on. Default is 70")
         )
         .get_matches()
    }
}