use tokio_gemini::{
    certs::{file_sscv::FileBasedCertVerifier, insecure::AllowAllCertVerifier},
    dns::DnsClient,
    Client, LibError,
};

//
// cargo add tokio_gemini -F file-sscv,hickory
// cargo add tokio -F macros,rt-multi-thread,io-util,fs
//

const USAGE: &str = "-k\t\tinsecure mode (trust all certs)
-d <DNS server addr>\tuse custom DNS for resolving & DANE
-h\t\tshow help";

struct Config {
    insecure: bool,
    dns: Option<String>,
    url: String,
}

#[tokio::main]
async fn main() -> Result<(), LibError> {
    let config = parse_args();
    let client = build_client(&config).await?;

    let mut resp = client.request(&config.url).await?;

    {
        let status_code = resp.status().status_code();
        let status_num: u8 = status_code.into();
        eprintln!("{} {:?}", status_num, status_code);
    }

    if resp.status().reply_type() == tokio_gemini::ReplyType::Success {
        let mime = resp.mime()?;
        eprintln!("Mime: {}", mime);

        if mime.type_() == mime::TEXT {
            println!("{}", resp.text().await?);
        } else {
            eprintln!("Downloading into content.bin");
            let mut f = tokio::fs::File::create("content.bin").await?;
            tokio::io::copy(&mut resp.stream(), &mut f).await?;
        }
    } else {
        eprintln!("Message: {}", resp.message());
    }

    Ok(())
}

fn parse_args() -> Config {
    let mut config = Config {
        insecure: false,
        dns: None,
        url: "gemini://geminiprotocol.net/".to_owned(),
    };

    let mut expected_dns = false;

    for arg in std::env::args().skip(1) {
        match arg.as_str() {
            dns if expected_dns => {
                config.dns = Some(dns.to_owned());
                expected_dns = false;
            }
            "-k" => config.insecure = true,
            "-d" => expected_dns = true,
            "-h" => {
                println!("{}", USAGE);
                std::process::exit(0);
            }
            url => {
                println!("URL: {}", url);
                config.url = url.to_owned();
                break;
            }
        }
    }

    if expected_dns {
        println!("{}", USAGE);
        std::process::exit(0);
    }

    config
}

async fn build_client(config: &Config) -> Result<Client, LibError> {
    let dns = if let Some(addr) = &config.dns {
        Some(DnsClient::init(addr).await?)
    } else {
        None
    };

    let client = tokio_gemini::Client::builder();

    let client = if config.insecure {
        client.with_custom_verifier(AllowAllCertVerifier::yes_i_know_what_i_am_doing())
    } else {
        client.with_selfsigned_cert_verifier(
            FileBasedCertVerifier::init("known_hosts", dns.clone()).await?,
        )
    };

    let client = if let Some(dns) = dns {
        client.with_dns_client(dns)
    } else {
        client
    };

    Ok(client.build())
}