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use std::env;
use std::ops::Add;
use std::process::Command;
use regex::{Regex, Match};

// TODO: openssl binary
pub fn binary_platform_name() -> String {
    let platform = name();

    match platform.as_str() {
        "linux" => {
            match get_linux_distro().as_str() {
                "alpine" => "linux-musl".to_string(),
                distro => panic!("unimplemented distro: {}", distro)
            }
        },
        _ => platform
    }
}

pub fn name() -> String {
    let os = env::consts::OS;

    match os {
        "macos" => "darwin".to_string(),
        os => os.to_string()
    }
}

fn get_linux_distro() -> String {
    let out = Command::new("cat").arg("/etc/os-release").output().unwrap();

    let stdout = String::from_utf8(out.stdout).unwrap();
    let stderr = String::from_utf8(out.stderr).unwrap();

    if stdout != "" {

    } else if stderr != "" {

    }

    "debian".to_string()
}

fn parse_linux_distro(str: String) -> String {

    let id_matches = Regex::new(r#"(?m)^ID="?([^"\n]*)"?"#)
        .unwrap()
        .find_iter(&str)
        .collect::<Vec<Match>>();

    let id = if id_matches.len() > 0 {
        id_matches[0].as_str().to_string()
    } else {
        "".to_string()
    };

    let id_like_matches = Regex::new(r#"(?m)^ID_LIKE="?([^"\n]*)"?"#)
        .unwrap()
        .find_iter(&str)
        .collect::<Vec<Match>>();

    let id_like = if id_like_matches.len() > 0 {
        id_like_matches[0].as_str().to_string()
    } else {
        "".to_string()
    };

    if id == "alpine" {
        return "alpine".to_string();
    };

    if id_like.contains("centos") ||
        id_like.contains("fedora") ||
        id_like.contains("rhel") ||
        id == "fedora" {
        return "rhel".to_string();
    };

    if id_like.contains("debian") ||
        id_like.contains("ubuntu") ||
        id == "debian" {
        return "debian".to_string();
    }

    "debian".to_string()
}

pub fn check_for_extension(platform: String, path: String) -> String {
    if platform == "windows" {
        if path.contains(".gz") {
            return path.replace(".gz", ".exe.gz")
        }
        return path.add(".exe")
    }

    path
}