use crate::{

    protocol::messages::server_chat,

    protocol::messages::{

        add_flags, remove_flags,

        HWProtocolMessage::{self, Rnd},

        HWServerMessage::{self, *},

        ProtocolFlags as Flags,

    },

    server::{

        client::HWClient,

        core::HWServer,

        coretypes::{ClientId, GameCfg, RoomId, TeamInfo, Vote, VoteType},

        room::HWRoom,

    },

    utils::to_engine_msg,

};

use super::Response;

use crate::server::coretypes::RoomConfig;

use rand::{self, seq::SliceRandom, thread_rng, Rng};

use std::{iter::once, mem::replace};

pub fn rnd_reply(options: &[String]) -> HWServerMessage {

    let mut rng = thread_rng();

    let reply = if options.is_empty() {

        (*&["heads", "tails"].choose(&mut rng).unwrap()).to_string()

    } else {

        options.choose(&mut rng).unwrap().clone()

    };

    ChatMsg {

        nick: "[random]".to_string(),

        msg: reply,

    }

}

pub fn join_lobby(server: &mut HWServer, response: &mut Response) {

    let client_id = response.client_id();

    let lobby_nicks: Vec<_> = server.collect_nicks(|(_, c)| c.room_id.is_none());

    let joined_msg = LobbyJoined(lobby_nicks);

    let everyone_msg = LobbyJoined(vec![server.clients[client_id].nick.clone()]);

    let flags_msg = ClientFlags(

        add_flags(&[Flags::InRoom]),

        server.collect_nicks(|(_, c)| c.room_id.is_some()),

    );

    let server_msg = ServerMessage(server.get_greetings(client_id).to_string());

    let rooms_msg = Rooms(

        server

            .rooms

            .iter()

            .flat_map(|(_, r)| r.info(r.master_id.map(|id| &server.clients[id])))

            .collect(),

    );

    response.add(everyone_msg.send_all().but_self());

    response.add(joined_msg.send_self());

    response.add(flags_msg.send_self());

    response.add(server_msg.send_self());

    response.add(rooms_msg.send_self());

}

pub fn remove_teams(

    room: &mut HWRoom,

    team_names: Vec<String>,

    is_in_game: bool,

    response: &mut Response,

) {

    if let Some(ref mut info) = room.game_info {

        for team_name in &team_names {

            info.left_teams.push(team_name.clone());

            if is_in_game {

                let msg = once(b'F').chain(team_name.bytes());

                response.add(

                    ForwardEngineMessage(vec![to_engine_msg(msg)])

                        .send_all()

                        .in_room(room.id)

                        .but_self(),

                );

                info.teams_in_game -= 1;

                let remove_msg = to_engine_msg(once(b'F').chain(team_name.bytes()));

                if let Some(m) = &info.sync_msg {

                    info.msg_log.push(m.clone());

                    info.sync_msg = None

                }

                info.msg_log.push(remove_msg.clone());

                response.add(

                    ForwardEngineMessage(vec![remove_msg])

                        .send_all()

                        .in_room(room.id)

                        .but_self(),

                );

            }

        }

    }

    for team_name in team_names {

        room.remove_team(&team_name);

        response.add(TeamRemove(team_name).send_all().in_room(room.id));

    }

}

fn remove_client_from_room(

    client: &mut HWClient,

    room: &mut HWRoom,

    response: &mut Response,

    msg: &str,

) {

    if room.players_number > 1 || room.is_fixed() {

        room.players_number -= 1;

        if client.is_ready() && room.ready_players_number > 0 {

            room.ready_players_number -= 1;

        }

        let team_names: Vec<_> = room

            .client_teams(client.id)

            .map(|t| t.name.clone())

            .collect();

        remove_teams(room, team_names, client.is_in_game(), response);

        if room.players_number > 0 {

            response.add(

                RoomLeft(client.nick.clone(), msg.to_string())

                    .send_all()

                    .in_room(room.id)

                    .but_self(),

            );

        }

        if client.is_master() && !room.is_fixed() {

            client.set_is_master(false);

            response.add(

                ClientFlags(

                    remove_flags(&[Flags::RoomMaster]),

                    vec![client.nick.clone()],

                )

                .send_all()

                .in_room(room.id),

            );

            room.master_id = None;

        }

    }

    client.room_id = None;

    let update_msg = if room.players_number == 0 && !room.is_fixed() {

        RoomRemove(room.name.clone())

    } else {

        RoomUpdated(room.name.clone(), room.info(Some(&client)))

    };

    response.add(update_msg.send_all().with_protocol(room.protocol_number));

    response.add(ClientFlags(remove_flags(&[Flags::InRoom]), vec![client.nick.clone()]).send_all());

}

pub fn change_master(

    server: &mut HWServer,

    from_id: ClientId,

    to_id: ClientId,

    room_id: RoomId,

    response: &mut Response,

) {

    server.clients[from_id].set_is_master(false);

    server.clients[to_id].set_is_master(true);

    server.rooms[room_id].master_id = Some(to_id);

    response.add(

        ClientFlags(

            add_flags(&[Flags::RoomMaster]),

            vec![server.clients[to_id].nick.clone()],

        )

        .send_all()

        .in_room(room_id),

    );

    response.add(

        ClientFlags(

            remove_flags(&[Flags::RoomMaster]),

            vec![server.clients[from_id].nick.clone()],

        )

        .send_all()

        .in_room(room_id),

    );

}

pub fn exit_room(server: &mut HWServer, client_id: ClientId, response: &mut Response, msg: &str) {

    let client = &mut server.clients[client_id];

    if let Some(room_id) = client.room_id {

        let room = &mut server.rooms[room_id];

        remove_client_from_room(client, room, response, msg);

        if !room.is_fixed() && room.master_id == None {

            if let Some(new_master_id) = server.collect_room_clients(room_id).first().cloned() {

                let new_master_nick = server.clients[new_master_id].nick.clone();

                let room = &mut server.rooms[room_id];

                room.master_id = Some(new_master_id);

                server.clients[new_master_id].set_is_master(true);

                if room.protocol_number < 42 {

                    room.name = new_master_nick.clone();

                }

                room.set_join_restriction(false);

                room.set_team_add_restriction(false);

                room.set_unregistered_players_restriction(true);

                response.add(

                    ClientFlags(add_flags(&[Flags::RoomMaster]), vec![new_master_nick])

                        .send_all()

                        .in_room(room.id),

                );

            }

        }

    }

}

pub fn remove_client(server: &mut HWServer, response: &mut Response, msg: String) {

    let client_id = response.client_id();

    let client = &mut server.clients[client_id];

    let nick = client.nick.clone();

    exit_room(server, client_id, response, &msg);

    server.remove_client(client_id);

    response.add(LobbyLeft(nick, msg.to_string()).send_all());

    response.add(Bye("User quit: ".to_string() + &msg).send_self());

    response.remove_client(client_id);

}

pub fn get_room_update(

    room_name: Option<String>,

    room: &HWRoom,

    master: Option<&HWClient>,

    response: &mut Response,

) {

    let update_msg = RoomUpdated(room_name.unwrap_or(room.name.clone()), room.info(master));

    response.add(update_msg.send_all().with_protocol(room.protocol_number));

}

pub fn get_room_config_impl(config: &RoomConfig, to_client: ClientId, response: &mut Response) {

    response.add(ConfigEntry("FULLMAPCONFIG".to_string(), config.to_map_config()).send(to_client));

    for cfg in config.to_game_config() {

        response.add(cfg.to_server_msg().send(to_client));

    }

}

pub fn get_room_config(room: &HWRoom, to_client: ClientId, response: &mut Response) {

    get_room_config_impl(room.active_config(), to_client, response);

}

pub fn get_teams<'a, I>(teams: I, to_client: ClientId, response: &mut Response)

where

    I: Iterator<Item = &'a TeamInfo>,

{

    for team in teams {

        response.add(TeamAdd(team.to_protocol()).send(to_client));

        response.add(TeamColor(team.name.clone(), team.color).send(to_client));

        response.add(HedgehogsNumber(team.name.clone(), team.hedgehogs_number).send(to_client));

    }

}

pub fn get_room_teams(

    server: &HWServer,

    room_id: RoomId,

    to_client: ClientId,

    response: &mut Response,

) {

    let room = &server.rooms[room_id];

    let current_teams = match room.game_info {

        Some(ref info) => &info.teams_at_start,

        None => &room.teams,

    };

    get_teams(current_teams.iter().map(|(_, t)| t), to_client, response);

}

pub fn get_room_flags(

    server: &HWServer,

    room_id: RoomId,

    to_client: ClientId,

    response: &mut Response,

) {

    let room = &server.rooms[room_id];

    if let Some(id) = room.master_id {

        response.add(

            ClientFlags(

                add_flags(&[Flags::RoomMaster]),

                vec![server.clients[id].nick.clone()],

            )

            .send(to_client),

        );

    }

    let nicks: Vec<_> = server

        .clients

        .iter()

        .filter(|(_, c)| c.room_id == Some(room_id) && c.is_ready())

        .map(|(_, c)| c.nick.clone())

        .collect();

    if !nicks.is_empty() {

        response.add(ClientFlags(add_flags(&[Flags::Ready]), nicks).send(to_client));

    }

}

pub fn apply_voting_result(

    server: &mut HWServer,

    room_id: RoomId,

    response: &mut Response,

    kind: VoteType,

) {

    match kind {

        VoteType::Kick(nick) => {

            if let Some(client) = server.find_client(&nick) {

                if client.room_id == Some(room_id) {

                    let id = client.id;

                    response.add(Kicked.send(id));

                    exit_room(server, id, response, "kicked");

                }

            }

        }

        VoteType::Map(None) => (),

        VoteType::Map(Some(name)) => {

            if let Some(location) = server.rooms[room_id].load_config(&name) {

                response.add(

                    server_chat(location.to_string())

                        .send_all()

                        .in_room(room_id),

                );

                let room = &server.rooms[room_id];

                let room_master = if let Some(id) = room.master_id {

                    Some(&server.clients[id])

                } else {

                    None

                };

                get_room_update(None, room, room_master, response);

                for (_, client) in server.clients.iter() {

                    if client.room_id == Some(room_id) {

                        super::common::get_room_config(&server.rooms[room_id], client.id, response);

                    }

                }

            }

        }

        VoteType::Pause => {

            if let Some(ref mut info) = server.rooms[room_id].game_info {

                info.is_paused = !info.is_paused;

                response.add(

                    server_chat("Pause toggled.".to_string())

                        .send_all()

                        .in_room(room_id),

                );

                response.add(

                    ForwardEngineMessage(vec![to_engine_msg(once(b'I'))])

                        .send_all()

                        .in_room(room_id),

                );

            }

        }

        VoteType::NewSeed => {

            let seed = thread_rng().gen_range(0, 1_000_000_000).to_string();

            let cfg = GameCfg::Seed(seed);

            response.add(cfg.to_server_msg().send_all().in_room(room_id));

            server.rooms[room_id].set_config(cfg);

        }

        VoteType::HedgehogsPerTeam(number) => {

            let r = &mut server.rooms[room_id];

            let nicks = r.set_hedgehogs_number(number);

            response.extend(

                nicks

                    .into_iter()

                    .map(|n| HedgehogsNumber(n, number).send_all().in_room(room_id)),

            );

        }

    }

}

fn add_vote(room: &mut HWRoom, response: &mut Response, vote: Vote) -> Option<bool> {

    let client_id = response.client_id;

    let mut result = None;

    if let Some(ref mut voting) = room.voting {

        if vote.is_forced || voting.votes.iter().all(|(id, _)| client_id != *id) {

            response.add(server_chat("Your vote has been counted.".to_string()).send_self());

            voting.votes.push((client_id, vote.is_pro));

            let i = voting.votes.iter();

            let pro = i.clone().filter(|(_, v)| *v).count();

            let contra = i.filter(|(_, v)| !*v).count();

            let success_quota = voting.voters.len() / 2 + 1;

            if vote.is_forced && vote.is_pro || pro >= success_quota {

                result = Some(true);

            } else if vote.is_forced && !vote.is_pro || contra > voting.voters.len() - success_quota

            {

                result = Some(false);

            }

        } else {

            response.add(server_chat("You already have voted.".to_string()).send_self());

        }

    } else {

        response.add(server_chat("There's no voting going on.".to_string()).send_self());

    }

    result

}

pub fn submit_vote(server: &mut HWServer, vote: Vote, response: &mut Response) {

    let client_id = response.client_id;

    let client = &server.clients[client_id];

    if let Some(room_id) = client.room_id {

        let room = &mut server.rooms[room_id];

        if let Some(res) = add_vote(room, response, vote) {

            response.add(

                server_chat("Voting closed.".to_string())

                    .send_all()

                    .in_room(room.id),

            );

            let voting = replace(&mut room.voting, None).unwrap();

            if res {

                apply_voting_result(server, room_id, response, voting.kind);

            }

        }

    }

}

pub fn start_game(server: &mut HWServer, room_id: RoomId, response: &mut Response) {

    let (room_clients, room_nicks): (Vec<_>, Vec<_>) = server

        .clients

        .iter()

        .map(|(id, c)| (id, c.nick.clone()))

        .unzip();

    let room = &mut server.rooms[room_id];

    if !room.has_multiple_clans() {

        response.add(

            Warning("The game can't be started with less than two clans!".to_string()).send_self(),

        );

    } else if room.protocol_number <= 43 && room.players_number != room.ready_players_number {

        response.add(Warning("Not all players are ready".to_string()).send_self());

    } else if room.game_info.is_some() {

        response.add(Warning("The game is already in progress".to_string()).send_self());

    } else {

        room.start_round();

        for id in room_clients {

            let c = &mut server.clients[id];

            c.set_is_in_game(false);

            c.team_indices = room.client_team_indices(c.id);

        }

        response.add(RunGame.send_all().in_room(room.id));