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//! This module contains the configuration of the application.
//!
//! All options are passed individually to each function and are not bundled together.
//!
//! # Examples
//!
//! ```no_run
//! # use dishub::options::Options;
//! let options = Options::parse();
//! println!("Config directory: {}", options.config_dir.0);
//! ```


use clap::{self, App, SubCommand, Arg, AppSettings};
use std::time::Duration;
use std::path::PathBuf;
use std::env::home_dir;
use std::str::FromStr;
use regex::Regex;
use std::fs;


lazy_static! {
    static ref SLEEP_RGX: Regex = Regex::new(r"(\d+)s").unwrap();
}


/// All possible subsystems, think `cargo`'s or `git`'s.
#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
pub enum Subsystem {
    /// Initialise global app data
    Init {
        /// Whether to override current app configuration. Default: `false`
        force: bool,
    },
    /// Add feeds to post to servers
    AddFeeds,
    /// Unsubscribe from selected followed feeds
    UnfollowFeeds,
    /// Run the activity-posting daemon
    StartDaemon {
        /// How long to sleep between each iteration. Default: 1 minute
        sleep: Duration,
    },
}


/// Representation of the application's all configurable values.
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Options {
    /// Directory containing configuration. Default: `"$HOME/.dishub"`
    pub config_dir: (String, PathBuf),
    /// The specified subsystem.
    pub subsystem: Subsystem,
}

impl Options {
    /// Parse `env`-wide command-line arguments into an `Options` instance
    pub fn parse() -> Options {
        let matches = App::new("dishub")
            .version(crate_version!())
            .author(crate_authors!())
            .setting(AppSettings::ColoredHelp)
            .setting(AppSettings::VersionlessSubcommands)
            .setting(AppSettings::SubcommandRequiredElseHelp)
            .about("Rust app for posting GitHub activity on Discord")
            .arg(Arg::from_usage("-c --config-dir=[CONFIG_DIR] 'Directory containing configuration. Default: $HOME/.dishub'")
                .validator(Options::config_dir_validator))
            .subcommand(SubCommand::with_name("init")
                .about("Initialise global app data")
                .arg(Arg::from_usage("-f --force 'Override current app configuration'")))
            .subcommand(SubCommand::with_name("add-feeds").about("Add feeds to post to servers"))
            .subcommand(SubCommand::with_name("unfollow-feeds").about("Unsubscribe from selected followed feeds"))
            .subcommand(SubCommand::with_name("start-daemon")
                .about("Run the activity-posting daemon")
                .arg(Arg::from_usage("-s --sleep=[SLEEP_TIME] 'Time to sleep between each iteration'")
                    .default_value("60s")
                    .validator(Options::sleep_validator)))
            .get_matches();

        Options {
            config_dir: match matches.value_of("config-dir") {
                Some(dirs) => (dirs.to_string(), fs::canonicalize(dirs).unwrap()),
                None => {
                    match home_dir() {
                        Some(mut hd) => {
                            hd = hd.canonicalize().unwrap();
                            hd.push(".dishub");

                            fs::create_dir_all(&hd).unwrap();
                            ("$HOME/.dishub".to_string(), hd)
                        }
                        None => {
                            clap::Error {
                                    message: "Couldn't automatically get home directory, please specify configuration directory with the -c option".to_string(),
                                    kind: clap::ErrorKind::MissingRequiredArgument,
                                    info: None,
                                }
                                .exit()
                        }
                    }
                }
            },
            subsystem: match matches.subcommand() {
                ("init", Some(init_matches)) => Subsystem::Init { force: init_matches.is_present("force") },
                ("add-feeds", _) => Subsystem::AddFeeds,
                ("unfollow-feeds", _) => Subsystem::UnfollowFeeds,
                ("start-daemon", Some(start_daemon_matches)) => {
                    Subsystem::StartDaemon { sleep: Duration::from_secs(Options::parse_sleep(start_daemon_matches.value_of("sleep").unwrap()).unwrap()) }
                }
                _ => panic!("No subcommand passed"),
            },
        }
    }

    fn parse_sleep(s: &str) -> Option<u64> {
        SLEEP_RGX.captures(s).map(|c| u64::from_str(c.at(1).unwrap()).unwrap())
    }

    fn config_dir_validator(s: String) -> Result<(), String> {
        fs::canonicalize(&s).map(|_| ()).map_err(|_| format!("Configuration directory \"{}\" not found", s))
    }

    fn sleep_validator(s: String) -> Result<(), String> {
        match Options::parse_sleep(&s) {
            None => Err(format!("\"{}\" is not a valid sleep duration (in format \"NNNs\")", s)),
            Some(_) => Ok(()),
        }
    }
}