use super::{

    client::HwClient,

};

use bitflags::*;

use serde::{Deserialize, Serialize};

use serde_derive::{Deserialize, Serialize};

use serde_yaml;

use std::{collections::HashMap, iter};

pub const MAX_TEAMS_IN_ROOM: u8 = 8;

pub const MAX_HEDGEHOGS_IN_ROOM: u8 = MAX_TEAMS_IN_ROOM * MAX_HEDGEHOGS_PER_TEAM;

fn client_teams_impl(

    teams: &[(ClientId, TeamInfo)],

    client_id: ClientId,

) -> impl Iterator<Item = &TeamInfo> + Clone {

    teams

        .iter()

        .filter(move |(id, _)| *id == client_id)

        .map(|(_, t)| t)

}

pub struct GameInfo {

    pub original_teams: Vec<(ClientId, TeamInfo)>,

    pub left_teams: Vec<String>,

    pub msg_log: Vec<String>,

    pub sync_msg: Option<String>,

    pub is_paused: bool,

    original_config: RoomConfig,

}

impl GameInfo {

    fn new(teams: Vec<(ClientId, TeamInfo)>, config: RoomConfig) -> GameInfo {

        GameInfo {

            left_teams: Vec::new(),

            msg_log: Vec::new(),

            sync_msg: None,

            is_paused: false,

            original_teams: teams,

            original_config: config,

        }

    }

    pub fn client_teams(&self, client_id: ClientId) -> impl Iterator<Item = &TeamInfo> + Clone {

        client_teams_impl(&self.original_teams, client_id)

    }

    pub fn mark_left_teams<'a, I>(&mut self, team_names: I)

    where

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

    {

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

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

            self.sync_msg = None

        }

        for team_name in team_names {

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

            let remove_msg = crate::utils::to_engine_msg(iter::once(b'F').chain(team_name.bytes()));

            self.msg_log.push(remove_msg);

        }

    }

}

#[derive(Serialize, Deserialize)]

pub struct RoomSave {

    pub location: String,

    config: RoomConfig,

}

bitflags! {

    pub struct RoomFlags: u8 {

        const FIXED = 0b0000_0001;

        const RESTRICTED_JOIN = 0b0000_0010;

        const RESTRICTED_TEAM_ADD = 0b0000_0100;

        const REGISTRATION_REQUIRED = 0b0000_1000;

    }

}

pub struct HwRoom {

    pub id: RoomId,

    pub master_id: Option<ClientId>,

    pub name: String,

    pub password: Option<String>,

    pub greeting: String,

    pub protocol_number: u16,

    pub flags: RoomFlags,

    pub players_number: u8,

    pub default_hedgehog_number: u8,

    pub max_teams: u8,

    pub ready_players_number: u8,

    pub teams: Vec<(ClientId, TeamInfo)>,

    config: RoomConfig,

    pub voting: Option<Voting>,

    pub saves: HashMap<String, RoomSave>,

    pub game_info: Option<GameInfo>,

}

impl HwRoom {

    pub fn new(id: RoomId) -> HwRoom {

        HwRoom {

            id,

            master_id: None,

            name: String::new(),

            password: None,

            greeting: "".to_string(),

            flags: RoomFlags::empty(),

            protocol_number: 0,

            players_number: 0,

            default_hedgehog_number: 4,

            max_teams: MAX_TEAMS_IN_ROOM,

            ready_players_number: 0,

            teams: Vec::new(),

            config: RoomConfig::new(),

            voting: None,

            saves: HashMap::new(),

            game_info: None,

        }

    }

    pub fn hedgehogs_number(&self) -> u8 {

        self.teams.iter().map(|(_, t)| t.hedgehogs_number).sum()

    }

    pub fn addable_hedgehogs(&self) -> u8 {

        MAX_HEDGEHOGS_IN_ROOM - self.hedgehogs_number()

    }

    pub fn add_team(

        &mut self,

        owner_id: ClientId,

        mut team: TeamInfo,

        preserve_color: bool,

    ) -> &TeamInfo {

        if !preserve_color {

            team.color = iter::repeat(())

                .enumerate()

                .map(|(i, _)| i as u8)

                .take(u8::max_value() as usize + 1)

                .find(|i| self.teams.iter().all(|(_, t)| t.color != *i))

                .unwrap_or(0u8)

        };

        team.hedgehogs_number = if self.teams.is_empty() {

            self.default_hedgehog_number

        } else {

            self.teams[0]

                .1

                .hedgehogs_number

                .min(self.addable_hedgehogs())

        };

        self.teams.push((owner_id, team));

        &self.teams.last().unwrap().1

    }

    pub fn remove_team(&mut self, team_name: &str) {

        if let Some(index) = self.teams.iter().position(|(_, t)| t.name == team_name) {

            self.teams.remove(index);

        }

    }

    pub fn set_hedgehogs_number(&mut self, n: u8) -> Vec<String> {

        let mut names = Vec::new();

        let teams = &mut self.teams;

        if teams.len() as u8 * n <= MAX_HEDGEHOGS_IN_ROOM {

            for (_, team) in teams.iter_mut() {

                team.hedgehogs_number = n;

                names.push(team.name.clone())

            }

            self.default_hedgehog_number = n;

        }

        names

    }

    pub fn teams_in_game(&self) -> Option<u8> {

        self.game_info

            .as_ref()

            .map(|info| (info.original_teams.len() - info.left_teams.len()) as u8)

    }

    pub fn find_team_and_owner_mut<F>(&mut self, f: F) -> Option<(ClientId, &mut TeamInfo)>

    where

        F: Fn(&TeamInfo) -> bool,

    {

        self.teams

            .iter_mut()

            .find(|(_, t)| f(t))

            .map(|(id, t)| (*id, t))

    }

    pub fn find_team<F>(&self, f: F) -> Option<&TeamInfo>

    where

        F: Fn(&TeamInfo) -> bool,

    {

        self.teams

            .iter()

            .find_map(|(_, t)| Some(t).filter(|t| f(&t)))

    }

    pub fn client_teams(&self, client_id: ClientId) -> impl Iterator<Item = &TeamInfo> {

        client_teams_impl(&self.teams, client_id)

    }

    pub fn client_team_indices(&self, client_id: ClientId) -> Vec<u8> {

        self.teams

            .iter()

            .enumerate()

            .filter(move |(_, (id, _))| *id == client_id)

            .map(|(i, _)| i as u8)

            .collect()

    }

    pub fn clan_team_owners(&self, color: u8) -> impl Iterator<Item = ClientId> + '_ {

        self.teams

            .iter()

            .filter(move |(_, t)| t.color == color)

            .map(|(id, _)| *id)

    }

    pub fn find_team_owner(&self, team_name: &str) -> Option<(ClientId, &str)> {

        self.teams

            .iter()

            .find(|(_, t)| t.name == team_name)

            .map(|(id, t)| (*id, &t.name[..]))

    }

    pub fn find_team_color(&self, owner_id: ClientId) -> Option<u8> {

        self.client_teams(owner_id).nth(0).map(|t| t.color)

    }

    pub fn has_multiple_clans(&self) -> bool {

        self.teams.iter().min_by_key(|(_, t)| t.color)

            != self.teams.iter().max_by_key(|(_, t)| t.color)

    }

    pub fn set_config(&mut self, cfg: GameCfg) {

        self.config.set_config(cfg);

    }

    pub fn start_round(&mut self) {

        if self.game_info.is_none() {

            self.game_info = Some(GameInfo::new(self.teams.clone(), self.config.clone()));

        }

    }

    pub fn is_fixed(&self) -> bool {

        self.flags.contains(RoomFlags::FIXED)

    }

    pub fn is_join_restricted(&self) -> bool {

        self.flags.contains(RoomFlags::RESTRICTED_JOIN)

    }

    pub fn is_team_add_restricted(&self) -> bool {

        self.flags.contains(RoomFlags::RESTRICTED_TEAM_ADD)

    }

    pub fn is_registration_required(&self) -> bool {

        self.flags.contains(RoomFlags::REGISTRATION_REQUIRED)

    }

    pub fn set_is_fixed(&mut self, value: bool) {

        self.flags.set(RoomFlags::FIXED, value)

    }

    pub fn set_join_restriction(&mut self, value: bool) {

        self.flags.set(RoomFlags::RESTRICTED_JOIN, value)

    }

    pub fn set_team_add_restriction(&mut self, value: bool) {

        self.flags.set(RoomFlags::RESTRICTED_TEAM_ADD, value)

    }

    pub fn set_unregistered_players_restriction(&mut self, value: bool) {

        self.flags.set(RoomFlags::REGISTRATION_REQUIRED, value)

    }

    fn flags_string(&self) -> String {

        let mut result = "-".to_string();

        if self.game_info.is_some() {

            result += "g"

        }

        if self.password.is_some() {

            result += "p"

        }

        if self.is_join_restricted() {

            result += "j"

        }

        if self.is_registration_required() {

            result += "r"

        }

        result

    }

    pub fn info(&self, master: Option<&HwClient>) -> Vec<String> {

        let c = &self.config;

        vec![

            self.flags_string(),

            self.name.clone(),

            self.players_number.to_string(),

            self.teams.len().to_string(),

            master.map_or("[]", |c| &c.nick).to_string(),

            c.map_type.to_string(),

            c.script.to_string(),

            c.scheme.name.to_string(),

            c.ammo.name.to_string(),

        ]

    }

    pub fn config(&self) -> &RoomConfig {

        &self.config

    }

    pub fn active_config(&self) -> &RoomConfig {

        match self.game_info {

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

            None => &self.config,

        }

    }

    pub fn map_config(&self) -> Vec<String> {

        match self.game_info {

            Some(ref info) => info.original_config.to_map_config(),

            None => self.config.to_map_config(),

        }

    }

    pub fn game_config(&self) -> Vec<GameCfg> {

        match self.game_info {

            Some(ref info) => info.original_config.to_game_config(),

            None => self.config.to_game_config(),

        }

    }

    pub fn save_config(&mut self, name: String, location: String) {

        self.saves.insert(

            name,

            RoomSave {

                location,

                config: self.config.clone(),

            },

        );

    }

    pub fn load_config(&mut self, name: &str) -> Option<&str> {

        if let Some(save) = self.saves.get(name) {

            self.config = save.config.clone();

            Some(&save.location[..])

        } else {

            None

        }

    }

    pub fn delete_config(&mut self, name: &str) -> bool {

        self.saves.remove(name).is_some()

    }

    pub fn get_saves(&self) -> Result<String, serde_yaml::Error> {

        serde_yaml::to_string(&(&self.greeting, &self.saves))

    }

    pub fn set_saves(&mut self, text: &str) -> Result<(), serde_yaml::Error> {

        serde_yaml::from_str::<(String, HashMap<String, RoomSave>)>(text).map(

            |(greeting, saves)| {

                self.greeting = greeting;

                self.saves = saves;

            },

        )

    }

}