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// Argument parsing
extern crate clap;
// Colors in the terminal
extern crate colored;
// Git stuff
extern crate git2;
// Get this machine's hostname
extern crate hostname;
// Working with JSON
#[macro_use]
extern crate serde_json;

use clap::{App,Arg,ArgGroup,ArgMatches,SubCommand};

use std::path;
use std::env;
use std::process;
use std::ffi;

// Use our error and result classes
pub use self::error::Error;
pub use self::result::Result;

// Include error type
pub mod error;
pub mod result;

// Include commands
mod config;
mod destroy;
mod home;
mod init;
mod link;
mod unlink;

pub fn run(matches : &ArgMatches) -> Result<()> {
    match matches.subcommand() {
        ("config", Some(sub_matches))  => config::run(&sub_matches),
        ("destroy", Some(sub_matches)) => destroy::run(&sub_matches),
        ("home",    Some(sub_matches)) => home::run(&sub_matches),
        ("init",    Some(sub_matches)) => init::run(&sub_matches),
        ("link",    Some(sub_matches)) => link::run(&sub_matches),
        ("unlink",  Some(sub_matches)) => unlink::run(&sub_matches),
        _ => Ok(())
    }
}

pub fn app<'a, 'b>() -> App<'a, 'b> {
    App::new("Ellipsis")
        .author("Andrew Lee <andrewtl@stanford.edu>")
        .about("Manages your dotfiles")
        .subcommand(SubCommand::with_name("config")
                    .about("Manages the configuation file")
                    .arg(Arg::with_name("edit")
                         .long("edit")
                         .short("e")
                         .help("Open the config file for editing")))
        .subcommand(SubCommand::with_name("destroy")
                     .about("Destroy the current installation")
                     .arg(Arg::with_name("force")
                          .long("force")
                          .short("f")
                          .help("Force the deletion of the given files. Without this option,
                       this command will not modify the filesystem."))
                     .arg(Arg::with_name("dry-run")
                          .long("dry-run")
                          .short("n")
                          .help("Don't actually do anything, just show what would happen"))
                     .group(ArgGroup::with_name("effect")
                            .args(&["force", "dry-run"])
                            .required(true)))
        .subcommand(SubCommand::with_name("home")
                    .about("Print the ellipsis home directory"))
        .subcommand(SubCommand::with_name("init")
                    .about("Init the repository")
                    .arg(Arg::with_name("URI")
                         .index(1)
                         .required(true)
                         .help("The repository to fetch")))
        .subcommand(SubCommand::with_name("link")
                    .about("Properly symlink files"))
        .subcommand(SubCommand::with_name("unlink")
                    .about("Delete symlinks"))
}

// Return the "home directory" where the config files will be stored
pub fn home_dir() -> Option<path::PathBuf> {
    if let Ok(str) = env::var("XDG_DATA_HOME") {
        Some(path::PathBuf::from(str).join("ellipsis"))
    } else {

        if let Some(myhome) = env::home_dir() {
            Some(myhome.join(".ellipsis"))
        } else {
            None
        }
    }
}

// Return the location of this device's .dot.json
pub fn config_file() -> Option<path::PathBuf> {
    if let Some(home) = home_dir() {
        if let Some(hname) = hostname::get_hostname() {
            Some(home.join(format!("{}.dot.json", hname)))
        } else {
            None
        }
    } else {
        None
    }
}

pub fn editor<P: AsRef<ffi::OsStr>>(path : P) -> Result<()> {
    process::Command::new(
        env::var("EDITOR").unwrap_or(String::from("vi")))
        .arg(path)
        .status()?;
    Ok(())
}


#[cfg(test)]
mod test;