use std::env;
use std::path::Path;
use std::process::Command;

use crate::internal::{crash, info};
use crate::repository::create_config;
use clap::{App, AppSettings, Arg, ArgSettings, SubCommand};

use crate::workspace::read_cfg;

#[global_allocator]
static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;

mod internal;
mod operations;
mod repository;
mod workspace;

fn main() {
    extern "C" {
        fn geteuid() -> u32;
    }

    if unsafe { geteuid() } == 0 {
        crash("Running malachite as root is disallowed as it can lead to system breakage. Instead, malachite will prompt you when it needs superuser permissions".to_string(), 1);
    }

    fn build_app() -> App<'static, 'static> {
        let app = App::new("Malachite")
            .version(env!("CARGO_PKG_VERSION"))
            .about(env!("CARGO_PKG_DESCRIPTION"))
            .arg(
                Arg::with_name("verbose")
                    .short("v")
                    .long("verbose")
                    .multiple(true)
                    .set(ArgSettings::Global)
                    .help("Sets the level of verbosity"),
            )
            .subcommand(
                SubCommand::with_name("build")
                    .about("Builds the given packages")
                    .arg(
                        Arg::with_name("package(s)")
                            .help("The packages to operate on")
                            .multiple(true)
                            .index(1),
                    )
                    .arg(
                        Arg::with_name("all")
                            .long("all")
                            .help("Builds all packages in mlc.toml (except if -x is specified)")
                            .conflicts_with("package(s)"),
                    )
                    .arg(
                        Arg::with_name("exclude")
                            .short("x")
                            .long("exclude")
                            .multiple(true)
                            .takes_value(true)
                            .help("Excludes packages from given operation"),
                    )
                    .arg(
                        Arg::with_name("no-regen")
                            .short("n")
                            .long("no-regen")
                            .help("Does not regenerate repository after building given package(s)"),
                    ),
            )
            .subcommand(
                SubCommand::with_name("repo-gen").about("Generates repository from built packages"),
            )
            .subcommand(
                SubCommand::with_name("prune")
                    .about("Prunes duplicate packages from the repository"),
            )
            .subcommand(SubCommand::with_name("init").about(
                "Clones all git repositories from mlc.toml branching from current directory",
            ))
            .subcommand(
                SubCommand::with_name("pull")
                    .alias("update")
                    .about(
                        "Pulls all git repositories from mlc.toml branching from current directory",
                    )
                    .arg(
                        Arg::with_name("package(s)")
                            .help("The packages to operate on")
                            .multiple(true)
                            .index(1),
                    ),
            )
            .subcommand(
                SubCommand::with_name("config").about("Create and/or open local config file"),
            )
            .settings(&[
                AppSettings::GlobalVersion,
                AppSettings::VersionlessSubcommands,
                AppSettings::ArgRequiredElseHelp,
                AppSettings::InferSubcommands,
            ]);
        app
    }

    let matches = build_app().get_matches();

    if Path::exists("mlc.toml".as_ref()) && Path::exists(".git".as_ref()) {
        info(
            "In a git repository, pulling latest mlc.toml. It is advised you run mlc pull/update"
                .to_string(),
        );
        Command::new("git")
            .arg("pull")
            .spawn()
            .unwrap()
            .wait()
            .unwrap();
    }

    if Path::exists("../.git".as_ref()) {
        info("Parent directory is a git directory, pulling latest mlc.toml. It is advised you run mlc pull/update in all malachite directories".to_string());
        let dir = env::current_dir().unwrap();
        env::set_current_dir("../").unwrap();
        Command::new("git")
            .arg("pull")
            .spawn()
            .unwrap()
            .wait()
            .unwrap();
        env::set_current_dir(dir).unwrap();
    }

    if let true = matches.is_present("init") {
        operations::init();
    }

    if let true = matches.is_present("build") {
        operations::build(&matches);
    }

    if let true = matches.is_present("pull") {
        operations::pull(&matches);
    }

    if let true = matches.is_present("repo-gen") {
        let config = read_cfg();
        if config.mode != "repository" {
            panic!("Cannot build packages in workspace mode")
        }
        info(format!("Generating repository: {}", config.name.unwrap()));
        repository::generate();
    }

    if let true = matches.is_present("prune") {
        operations::prune();
    }

    if let true = matches.is_present("config") {
        operations::config();
    }
}