use std::fs::File;
use std::path::Path;
use std::io::Read;
use std::result::Result;

use reqwest::IntoUrl;
use reqwest::Client;
use reqwest::header::ETAG;

use smush::decode;

fn main() -> Result<(), std::io::Error> {
    let client = Client::new();

    let args: Vec<_> = std::env::args().collect();
    if args.len() < 2 {
        println!("[PACK]: Please enter a package name...");
        std::process::exit(1);
    }

    let split = args[1].as_str().split("::");
    let vec: Vec<&str> = split.collect();
    
    println!("[PACK]: Downloading {}", vec[0]);

    if !Path::new(format!("/usr/pack/repo/{}", vec[1]).as_str()).exists() {
        println!("[PACK]: Path /usr/pack/repo/{} does not exist. Please setup your environment.", vec[1]);
        std::process::exit(1);
    }

    let full_path: Vec<&str> = vec[0].split("/").collect();
    let pkgname = full_path[full_path.len() - 1];
    let repo = match vec[1] {
        "arch" => "http://mirrors.advancedhosters.com/archlinux/core/os/x86_64/",
        _ => {
            println!("Repo {} is not supported...", vec[1]);
            std::process::exit(0);
        },
    };

    print!("Making request...");
    let url = reqwest::Url::parse(&(repo.to_string() + pkgname)).expect("Failed to parse URL");
    let mut resp = client.get(url)
        .send().expect("Failed to make request");
    
    if resp.status().is_success() {
        println!("OK");
        if let Some(etag) = resp.headers().get(ETAG) {
            std::fs::write("etag", etag.as_bytes()).expect("Failed to write ETAG...");
        }

        let mut file = match File::create(format!("/usr/pack/repo/{}/tarballs/{}", vec[1], pkgname)) {
            Ok(res) => res,
            Err(e) => {
                println!("Failed to create file...did you setup you environment? Do you have permission to create files?");
                println!("\nError: {}", e);
                std::process::exit(1);
            }
        };

        resp.copy_to(&mut file).expect("failed to write file");
    } else {
        println!("FAIL!");
        std::process::exit(1);
    }

    let mut archive = File::open(format!("/usr/pack/repo/{}/tarballs/{}", vec[1], pkgname)).expect("Failed to open tar...");
    let mut tar = Vec::new();
    archive.read_to_end(&mut tar).expect("Failed to read tar...");

    Ok(())
}