use nom::*;

use std::{

    str, str::FromStr,

    ops::Range

};

use super::{

    messages::{HWProtocolMessage, HWProtocolMessage::*},

    test::gen_proto_msg

};

named!(end_of_message, tag!("\n\n"));

named!(str_line<&[u8],   &str>, map_res!(not_line_ending, str::from_utf8));

named!(  a_line<&[u8], String>, map!(str_line, String::from));

named!( u8_line<&[u8],     u8>, map_res!(str_line, FromStr::from_str));

named!(u32_line<&[u8],    u32>, map_res!(str_line, FromStr::from_str));

named!(opt_param<&[u8], Option<String> >, opt!(map!(flat_map!(preceded!(eol, str_line), non_empty), String::from)));

named!(basic_message<&[u8], HWProtocolMessage>, alt!(

      do_parse!(tag!("PING") >> (Ping))

    | do_parse!(tag!("PONG") >> (Pong))

    | do_parse!(tag!("LIST") >> (List))

    | do_parse!(tag!("BANLIST")        >> (BanList))

    | do_parse!(tag!("GET_SERVER_VAR") >> (GetServerVar))

    | do_parse!(tag!("TOGGLE_READY")   >> (ToggleReady))

    | do_parse!(tag!("START_GAME")     >> (StartGame))

    | do_parse!(tag!("ROUNDFINISHED")  >> (RoundFinished))

    | do_parse!(tag!("TOGGLE_RESTRICT_JOINS")  >> (ToggleRestrictJoin))

    | do_parse!(tag!("TOGGLE_RESTRICT_TEAMS")  >> (ToggleRestrictTeams))

    | do_parse!(tag!("TOGGLE_REGISTERED_ONLY") >> (ToggleRegisteredOnly))

));

named!(one_param_message<&[u8], HWProtocolMessage>, alt!(

      do_parse!(tag!("NICK")    >> eol >> n: a_line >> (Nick(n)))

    | do_parse!(tag!("INFO")    >> eol >> n: a_line >> (Info(n)))

    | do_parse!(tag!("CHAT")    >> eol >> m: a_line >> (Chat(m)))

    | do_parse!(tag!("PART")    >> msg: opt_param   >> (Part(msg)))

    | do_parse!(tag!("FOLLOW")  >> eol >> n: a_line >> (Follow(n)))

    | do_parse!(tag!("KICK")    >> eol >> n: a_line >> (Kick(n)))

    | do_parse!(tag!("UNBAN")   >> eol >> n: a_line >> (Unban(n)))

    | do_parse!(tag!("EM")      >> eol >> m: a_line >> (EngineMessage(m)))

    | do_parse!(tag!("TEAMCHAT")    >> eol >> m: a_line >> (TeamChat(m)))

    | do_parse!(tag!("ROOM_NAME")   >> eol >> n: a_line >> (RoomName(n)))

    | do_parse!(tag!("REMOVE_TEAM") >> eol >> n: a_line >> (RemoveTeam(n)))

    | do_parse!(tag!("PROTO")   >> eol >> d: u32_line >> (Proto(d)))

    | do_parse!(tag!("QUIT")   >> msg: opt_param >> (Quit(msg)))

));

named!(cmd_message<&[u8], HWProtocolMessage>, preceded!(tag!("CMD\n"), alt!(

      do_parse!(tag_no_case!("STATS") >> (Stats))

    | do_parse!(tag_no_case!("FIX")   >> (Fix))

    | do_parse!(tag_no_case!("UNFIX") >> (Unfix))

    | do_parse!(tag_no_case!("RESTART_SERVER") >> eol >> tag!("YES") >> (RestartServer))

    | do_parse!(tag_no_case!("REGISTERED_ONLY") >> (ToggleServerRegisteredOnly))

    | do_parse!(tag_no_case!("SUPER_POWER")     >> (SuperPower))

    | do_parse!(tag_no_case!("PART")     >> m: opt_param >> (Part(m)))

    | do_parse!(tag_no_case!("QUIT")     >> m: opt_param >> (Quit(m)))

    | do_parse!(tag_no_case!("DELEGATE") >> eol >> n: a_line  >> (Delegate(n)))

    | do_parse!(tag_no_case!("SAVEROOM") >> eol >> r: a_line  >> (SaveRoom(r)))

    | do_parse!(tag_no_case!("LOADROOM") >> eol >> r: a_line  >> (LoadRoom(r)))

    | do_parse!(tag_no_case!("DELETE")   >> eol >> r: a_line  >> (Delete(r)))

    | do_parse!(tag_no_case!("GLOBAL")   >> eol >> m: a_line  >> (Global(m)))

    | do_parse!(tag_no_case!("WATCH")    >> eol >> i: a_line  >> (Watch(i)))

    | do_parse!(tag_no_case!("GREETING") >> eol >> m: a_line  >> (Greeting(m)))

    | do_parse!(tag_no_case!("VOTE")     >> eol >> m: a_line  >> (Vote(m)))

    | do_parse!(tag_no_case!("FORCE")    >> eol >> m: a_line  >> (ForceVote(m)))

    | do_parse!(tag_no_case!("INFO")     >> eol >> n: a_line  >> (Info(n)))

    | do_parse!(tag_no_case!("MAXTEAMS") >> eol >> n: u8_line >> (MaxTeams(n)))

)));

named!(complex_message<&[u8], HWProtocolMessage>, alt!(

      do_parse!(tag!("PASSWORD")  >> eol >>

                    p: a_line     >> eol >>

                    s: a_line     >>

                    (Password(p, s)))

    | do_parse!(tag!("CHECKER")   >> eol >>

                    i: u32_line   >> eol >>

                    n: a_line     >> eol >>

                    p: a_line     >>

                    (Checker(i, n, p)))

    | do_parse!(tag!("CREATE_ROOM") >> eol >>

                    n: a_line       >>

                    p: opt_param    >>

                    (CreateRoom(n, p)))

    | do_parse!(tag!("JOIN_ROOM")   >> eol >>

                    n: a_line       >>

                    p: opt_param    >>

                    (JoinRoom(n, p)))

    | do_parse!(tag!("BAN")    >> eol >>

                    n: a_line     >> eol >>

                    r: a_line     >> eol >>

                    t: u32_line   >>

                    (Ban(n, r, t)))

    | do_parse!(tag!("BAN_IP")    >> eol >>

                    n: a_line     >> eol >>

                    r: a_line     >> eol >>

                    t: u32_line   >>

                    (BanIP(n, r, t)))

    | do_parse!(tag!("BAN_NICK")    >> eol >>

                    n: a_line     >> eol >>

                    r: a_line     >> eol >>

                    t: u32_line   >>

                    (BanNick(n, r, t)))

));

named!(malformed_message<&[u8], HWProtocolMessage>,

    do_parse!(separated_list!(eol, a_line) >> (Malformed)));

named!(empty_message<&[u8], HWProtocolMessage>,

    do_parse!(alt!(end_of_message | eol) >> (Empty)));

named!(message<&[u8], HWProtocolMessage>, alt!(terminated!(

    alt!(

          basic_message

        | one_param_message

        | cmd_message

        | complex_message

        ), end_of_message

    )

    | terminated!(malformed_message, end_of_message)

    | empty_message

    )

);

named!(pub extract_messages<&[u8], Vec<HWProtocolMessage> >, many0!(complete!(message)));

proptest! {

    #[test]

    fn is_parser_composition_idempotent(ref msg in gen_proto_msg()) {

        println!("!! Msg: {:?}, Bytes: {:?} !!", msg, msg.to_raw_protocol().as_bytes());

        assert_eq!(message(msg.to_raw_protocol().as_bytes()), IResult::Done(&b""[..], msg.clone()))

    }

}

#[test]

fn parse_test() {

    assert_eq!(message(b"PING\n\n"),          IResult::Done(&b""[..], Ping));

    assert_eq!(message(b"START_GAME\n\n"),    IResult::Done(&b""[..], StartGame));

    assert_eq!(message(b"NICK\nit's me\n\n"), IResult::Done(&b""[..], Nick("it's me".to_string())));

    assert_eq!(message(b"PROTO\n51\n\n"),     IResult::Done(&b""[..], Proto(51)));

    assert_eq!(message(b"QUIT\nbye-bye\n\n"), IResult::Done(&b""[..], Quit(Some("bye-bye".to_string()))));

    assert_eq!(message(b"QUIT\n\n"),          IResult::Done(&b""[..], Quit(None)));

    assert_eq!(message(b"CMD\nwatch\ndemo\n\n"), IResult::Done(&b""[..], Watch("demo".to_string())));

    assert_eq!(message(b"BAN\nme\nbad\n77\n\n"), IResult::Done(&b""[..], Ban("me".to_string(), "bad".to_string(), 77)));

    assert_eq!(message(b"CMD\nPART\n\n"),      IResult::Done(&b""[..], Part(None)));

    assert_eq!(message(b"CMD\nPART\n_msg_\n\n"), IResult::Done(&b""[..], Part(Some("_msg_".to_string()))));

    assert_eq!(extract_messages(b"QUIT\n1\n2\n\n"),    IResult::Done(&b""[..], vec![Malformed]));

    assert_eq!(extract_messages(b"PING\n\nPING\n\nP"), IResult::Done(&b"P"[..], vec![Ping, Ping]));

    assert_eq!(extract_messages(b"SING\n\nPING\n\n"),  IResult::Done(&b""[..],  vec![Malformed, Ping]));

    assert_eq!(extract_messages(b"\n\n\n\nPING\n\n"),  IResult::Done(&b""[..],  vec![Empty, Empty, Ping]));

    assert_eq!(extract_messages(b"\n\n\nPING\n\n"),    IResult::Done(&b""[..],  vec![Empty, Empty, Ping]));

}