use std::{

    iter, collections::HashMap

};

use crate::server::{

    coretypes::{

        ClientId, RoomId, TeamInfo, GameCfg, GameCfg::*, Voting,

        MAX_HEDGEHOGS_PER_TEAM

    },

    client::{HWClient}

};

use serde::{Serialize, Deserialize};

use serde_yaml;

const MAX_TEAMS_IN_ROOM: u8 = 8;

const MAX_HEDGEHOGS_IN_ROOM: u8 =

    MAX_HEDGEHOGS_PER_TEAM * MAX_HEDGEHOGS_PER_TEAM;

#[derive(Clone, Serialize, Deserialize)]

struct Ammo {

    name: String,

    settings: Option<String>

}

#[derive(Clone, Serialize, Deserialize)]

struct Scheme {

    name: String,

    settings: Vec<String>

}

#[derive(Clone, Serialize, Deserialize)]

struct RoomConfig {

    feature_size: u32,

    map_type: String,

    map_generator: u32,

    maze_size: u32,

    seed: String,

    template: u32,

    ammo: Ammo,

    scheme: Scheme,

    script: String,

    theme: String,

    drawn_map: Option<String>

}

impl RoomConfig {

    fn new() -> RoomConfig {

        RoomConfig {

            feature_size: 12,

            map_type: "+rnd+".to_string(),

            map_generator: 0,

            maze_size: 0,

            seed: "seed".to_string(),

            template: 0,

            ammo: Ammo {name: "Default".to_string(), settings: None },

            scheme: Scheme {name: "Default".to_string(), settings: Vec::new() },

            script: "Normal".to_string(),

            theme: "\u{1f994}".to_string(),

            drawn_map: None

        }

    }

}

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)

}

fn map_config_from(c: &RoomConfig) -> Vec<String> {

    vec![c.feature_size.to_string(), c.map_type.to_string(),

         c.map_generator.to_string(), c.maze_size.to_string(),

         c.seed.to_string(), c.template.to_string()]

}

fn game_config_from(c: &RoomConfig) -> Vec<GameCfg> {

    use crate::server::coretypes::GameCfg::*;

    let mut v = vec![

        Ammo(c.ammo.name.to_string(), c.ammo.settings.clone()),

        Scheme(c.scheme.name.to_string(), c.scheme.settings.clone()),

        Script(c.script.to_string()),

        Theme(c.theme.to_string())];

    if let Some(ref m) = c.drawn_map {

        v.push(DrawnMap(m.to_string()))

    }

    v

}

pub struct GameInfo {

    pub teams_in_game: u8,

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

    pub left_teams: Vec<String>,

    pub msg_log: Vec<String>,

    pub sync_msg: Option<String>,

    pub is_paused: bool,

    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,

            teams_in_game: teams.len() as u8,

            teams_at_start: teams,

            config

        }

    }

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

        client_teams_impl(&self.teams_at_start, client_id)

    }

}

#[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 RESTRICTED_UNREGISTERED_PLAYERS = 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 team_limit: 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,

            team_limit: 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, name: &str) {

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

            self.teams.remove(index);

        }

    }

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

        let mut names = Vec::new();

        let teams = match self.game_info {

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

            None => &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 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().map(|(_, t)| t).find(|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 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) {

        let c = &mut self.config;

        match cfg {

            FeatureSize(s) => c.feature_size = s,

            MapType(t) => c.map_type = t,

            MapGenerator(g) => c.map_generator = g,

            MazeSize(s) => c.maze_size = s,

            Seed(s) => c.seed = s,

            Template(t) => c.template = t,

            Ammo(n, s) => c.ammo = Ammo {name: n, settings: s},

            Scheme(n, s) => c.scheme = Scheme {name: n, settings: s},

            Script(s) => c.script = s,

            Theme(t) => c.theme = t,

            DrawnMap(m) => c.drawn_map = Some(m)

        };

    }

    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 are_unregistered_players_restricted(&self) -> bool {

        self.flags.contains(RoomFlags::RESTRICTED_UNREGISTERED_PLAYERS)

    }

    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::RESTRICTED_UNREGISTERED_PLAYERS, 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.are_unregistered_players_restricted() {

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

        match self.game_info {

            Some(ref info) => map_config_from(&info.config),

            None => map_config_from(&self.config)

        }

    }

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

        match self.game_info {

            Some(ref info) => game_config_from(&info.config),

            None => game_config_from(&self.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;

        })

    }

    pub fn team_info(owner: &HWClient, team: &TeamInfo) -> Vec<String> {

        let mut info = vec![

            team.name.clone(),

            team.grave.clone(),

            team.fort.clone(),

            team.voice_pack.clone(),

            team.flag.clone(),

            owner.nick.clone(),

            team.difficulty.to_string()];

        let hogs = team.hedgehogs.iter().flat_map(|h|

            iter::once(h.name.clone()).chain(iter::once(h.hat.clone())));

        info.extend(hogs);

        info

    }

}