use anyhow::{bail, Result};

use argparse::{ArgumentParser, Store};

use hedgewars_network_protocol::{

    messages::HwProtocolMessage as ClientMessage, messages::HwServerMessage::*, parser,

};

use ini::Ini;

use log::{debug, info, warn};

use netbuf::Buf;

use std::{io::Write, net::TcpStream, process::Command, str::FromStr};

fn check(executable: &str, data_prefix: &str, buffer: &[String]) -> Result<Vec<String>> {

    let mut replay = tempfile::NamedTempFile::new()?;

    for line in buffer.into_iter() {

        replay.write(&base64::decode(line)?)?;

    }

    let temp_file_path = replay.path();

    let mut home_dir = dirs::home_dir().unwrap();

    home_dir.push(".hedgewars");

    debug!("Checking replay in {}", temp_file_path.to_string_lossy());

    let output = Command::new(executable)

        .arg("--user-prefix")

        .arg(&home_dir)

        .arg("--prefix")

        .arg(data_prefix)

        .arg("--nomusic")

        .arg("--nosound")

        .arg("--stats-only")

        .arg(temp_file_path)

        .output()?;

    let mut result = Vec::new();

    let mut engine_lines = output

        .stderr

        .split(|b| *b == '\n' as u8)

        .skip_while(|l| *l != b"WINNERS" && *l != b"DRAW");

    loop {

        match engine_lines.next() {

            Some(b"DRAW") => result.push("DRAW".to_owned()),

            Some(b"WINNERS") => {

                result.push("WINNERS".to_owned());

                let winners = engine_lines.next().unwrap();

                let winners_num = u32::from_str(&String::from_utf8(winners.to_vec())?)?;

                result.push(String::from_utf8(winners.to_vec())?);

                for _i in 0..winners_num {

                    result.push(String::from_utf8(engine_lines.next().unwrap().to_vec())?);

                }

            }

            Some(b"GHOST_POINTS") => {

                result.push("GHOST_POINTS".to_owned());

                let points = engine_lines.next().unwrap();

                let points_num = u32::from_str(&String::from_utf8(points.to_vec())?)? * 2;

                result.push(String::from_utf8(points.to_vec())?);

                for _i in 0..points_num {

                    result.push(String::from_utf8(engine_lines.next().unwrap().to_vec())?);

                }

            }

            Some(b"ACHIEVEMENT") => {

                result.push("ACHIEVEMENT".to_owned());

                for _i in 0..4 {

                    result.push(String::from_utf8(engine_lines.next().unwrap().to_vec())?);

                }

            }

            _ => break,

        }

    }

    if result.len() > 0 {

        Ok(result)

    } else {

        bail!("no data from engine")

    }

}

fn connect_and_run(

    username: &str,

    password: &str,

    protocol_number: u16,

    executable: &str,

    data_prefix: &str,

) -> Result<()> {

    info!("Connecting...");

    let mut stream = TcpStream::connect("hedgewars.org:46631")?;

    stream.set_nonblocking(false)?;

    let mut buf = Buf::new();

    loop {

        buf.read_from(&mut stream)?;

        while let Ok((tail, msg)) = parser::server_message(buf.as_ref()) {

            match msg {

                Connected(_, _) => {

                    info!("Connected");

                    stream.write(

                        ClientMessage::Checker(

                            protocol_number,

                            username.to_owned(),

                            password.to_owned(),

                        )

                        .to_raw_protocol()

                        .as_bytes(),

                    )?;

                }

                Ping => {

                    stream.write(ClientMessage::Pong.to_raw_protocol().as_bytes())?;

                }

                LogonPassed => {

                    stream.write(ClientMessage::CheckerReady.to_raw_protocol().as_bytes())?;

                }

                Replay(lines) => {

                    info!("Got a replay");

                    match check(executable, data_prefix, &lines) {

                        Ok(result) => {

                            info!("Checked");

                            debug!("Check result: [{:?}]", result);

                            stream.write(

                                ClientMessage::CheckedOk(result)

                                    .to_raw_protocol()

                                    .as_bytes(),

                            )?;

                            stream

                                .write(ClientMessage::CheckerReady.to_raw_protocol().as_bytes())?;

                        }

                        Err(e) => {

                            info!("Check failed: {:?}", e);

                            stream.write(

                                ClientMessage::CheckedFail("error".to_owned())

                                    .to_raw_protocol()

                                    .as_bytes(),

                            )?;

                            stream

                                .write(ClientMessage::CheckerReady.to_raw_protocol().as_bytes())?;

                        }

                    }

                }

                Bye(message) => {

                    warn!("Received BYE: {}", message);

                    return Ok(());

                }

                ChatMsg { nick, msg } => {

                    info!("Chat [{}]: {}", nick, msg);

                }

                RoomAdd(fields) => {

                    info!("Room added: {}", l.skip(1).next().unwrap());

                }

                RoomUpdated(name, fields) => {

                    let new_name = l.skip(1).next().unwrap();

                        info!("Room renamed: {}", new_name);

                    }

                }

                RoomRemove(_) => {

                    // ignore

                }

                Error(message) => {

                    warn!("Received ERROR: {}", message);

                    return Ok(());

                }

                something => {

                    warn!("Unexpected protocol command: {:?}", something)

                }

            }

        }

    }

}

fn get_protocol_number(executable: &str) -> std::io::Result<u16> {

    let output = Command::new(executable).arg("--protocol").output()?;

    Ok(u16::from_str(&String::from_utf8(output.stdout).unwrap().trim()).unwrap_or(55))

}

fn main() {

    stderrlog::new()

        .verbosity(3)

        .timestamp(stderrlog::Timestamp::Second)

        .module(module_path!())

        .init()

        .unwrap();

    let mut frontend_settings = dirs::home_dir().unwrap();

    frontend_settings.push(".hedgewars/settings.ini");

    let i = Ini::load_from_file(frontend_settings.to_str().unwrap()).unwrap();

    let username = i.get_from(Some("net"), "nick").unwrap();

    let password = i.get_from(Some("net"), "passwordhash").unwrap();

    let mut exe = "/usr/local/bin/hwengine".to_string();

    let mut prefix = "/usr/local/share/hedgewars/Data".to_string();

    {

        let mut ap = ArgumentParser::new();

        ap.set_description("Game replay checker for hedgewars.");

        ap.refer(&mut exe)

            .add_option(&["--exe"], Store, "Path to hwengine executable");

        ap.refer(&mut prefix)

            .add_option(&["--prefix"], Store, "Path main Data dir");

        ap.parse_args_or_exit();

    }

    info!("Executable: {}", exe);

    info!("Data dir: {}", prefix);

    let protocol_number = get_protocol_number(&exe.as_str()).unwrap_or_default();

    info!("Using protocol number {}", protocol_number);

    connect_and_run(&username, &password, protocol_number, &exe, &prefix).unwrap();

}