use config::{Config, File};
use serde::{Deserialize, Serialize};
use serenity::prelude::TypeMapKey;
use std::collections::HashMap;
use std::fmt::{Display, Formatter};
use std::path::Path;
use std::path::PathBuf;
use std::sync::Arc;
use structopt::StructOpt;
use tokio::sync::Mutex;

#[derive(Debug, StructOpt)]
#[structopt(name = "WOXlf", about = "WOXlf discord bot")]
pub struct Args {
    pub cfg_path: PathBuf,
}

#[derive(Debug, Deserialize, Serialize, Clone)]
pub struct BotConfig {
    pub token: String,
    pub app_id: u64,
    pub host_channel: u64,
    pub vote_channel: u64,
    pub category: u64,
    pub game_state_dir: PathBuf,
    pub occupation: Vec<String>,
    pub adjective: Vec<String>,
}

impl BotConfig {
    pub fn new(config_path: &Path) -> Result<Self, config::ConfigError> {
        let cfg = Config::builder()
            .add_source(File::from(config_path))
            .build()?;

        cfg.try_deserialize()
    }

    pub fn get_game_state_path(&self) -> PathBuf {
        self.game_state_dir.join("wOxlf_data.toml")
    }
}

#[derive(Debug, Deserialize, Serialize, Clone, Eq, PartialEq)]
pub enum Phase {
    Day,
    Night,
}

impl Default for Phase {
    fn default() -> Self {
        Self::Night
    }
}

impl Display for Phase {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        let phase_name = match self {
            Self::Day => "Day",
            Self::Night => "Night",
        };

        write!(f, "{}", phase_name)
    }
}

#[derive(Debug, Deserialize, Serialize, Clone, Default, Hash)]
pub struct PlayerData {
    pub channel: u64,
    pub discord_id: u64,
    pub codename: String,
    pub vote_target: Option<u64>,
}

#[derive(Debug, Deserialize, Serialize, Clone, Default)]
pub struct GameState {
    pub phase_number: u64,
    pub current_phase: Phase,
    pub phase_end_time: u64,
    pub player_data: Vec<PlayerData>,
}

impl GameState {
    pub fn codename_exists(&self, codename: &str) -> bool {
        self.player_data
            .iter()
            .any(|data| data.codename.to_lowercase() == codename)
    }

    pub fn clear(&mut self) {
        self.player_data.clear();
        self.current_phase = Phase::Night;
        self.phase_end_time = 0;
        self.phase_number = 1;
    }

    pub fn get_player_from_channel(&self, channel_id: u64) -> Option<&PlayerData> {
        self.player_data.iter().find(|p| p.channel == channel_id)
    }

    pub fn get_player_from_discord_id(&self, discord_id: u64) -> Option<&PlayerData> {
        self.player_data.iter().find(|p| p.discord_id == discord_id)
    }

    pub fn get_player_from_channel_mut(&mut self, channel_id: u64) -> Option<&mut PlayerData> {
        self.player_data
            .iter_mut()
            .find(|p| p.channel == channel_id)
    }

    pub fn get_player_by_codename(&self, codename: &str) -> Option<PlayerData> {
        self.player_data
            .iter()
            .find(|p| p.codename.to_lowercase() == codename.to_lowercase())
            .cloned()
    }

    pub fn next_phase(&mut self) {
        if self.current_phase == Phase::Night {
            self.current_phase = Phase::Day
        } else {
            self.phase_number += 1;
            self.current_phase = Phase::Night
        }

        for mut player in &mut self.player_data {
            player.vote_target = None
        }
    }

    pub fn get_phase_end_time(&self) -> String {
        format!("<t:{}:f>", self.phase_end_time)
    }

    pub fn get_phase_countdown(&self) -> String {
        format!("<t:{}:R>", self.phase_end_time)
    }

    pub fn add_time_to_phase(&mut self, hours: u64) {
        self.phase_end_time += hours * 60 * 60;
    }

    pub fn get_vote_tallies(&self) -> HashMap<String, u32> {
        let mut vote_set: HashMap<String, u32> = HashMap::new();

        for player in &self.player_data {
            if let Some(vote_target) = player.vote_target {
                let target = self.get_player_from_discord_id(vote_target);
                if let Some(target) = target {
                    *vote_set.entry(target.codename.clone()).or_insert(0) += 1;
                }
            }
        }

        vote_set
    }
}

#[derive(Debug, Deserialize, Serialize, Clone)]
pub struct GlobalData {
    pub cfg: BotConfig,
    pub game_state: GameState,
}

impl GlobalData {
    pub fn new(cfg: BotConfig) -> Self {
        Self {
            cfg,
            game_state: GameState::default(),
        }
    }
}

impl TypeMapKey for GlobalData {
    type Value = Arc<Mutex<GlobalData>>;
}

#[derive(Debug, Deserialize, Serialize, Clone)]
pub enum MessageSource {
    Player(u64),
    Host,
    Automated,
}