use anyhow::Result;
use rand::prelude::IteratorRandom;
use rand::thread_rng;
use serde::{Deserialize, Serialize};
use std::net::SocketAddr;

/// User
pub struct User {
    pub name: String,
    pub addr: SocketAddr,
}

/// New game request structure
#[derive(Debug, Deserialize)]
pub struct NewGameRequest {
    /// Game name
    pub name: String,
    /// Game host
    pub host: CAHPlayer,
    /// Chosen packs
    pub packs: Vec<u8>,
}

/// Game join request structure
pub struct GameJoinRequest {
    /// Game id
    pub id: u8, // increase later
    /// Game password
    pub password: Option<String>,
    /// Player info
    pub player: CAHPlayer,
}

/// A CAH white card
#[derive(Debug, Serialize, Deserialize)]
pub struct CAHCardWhite {
    /// Card text
    pub text: String,
    /// ID of the pack it came from
    pack: u8,
}

/// A CAH black card
#[derive(Debug, Serialize, Deserialize)]
pub struct CAHCardBlack {
    /// Card text
    pub text: String,
    /// Amount of cards to submit for judging
    pick: u8,
    /// ID of the pack it came from
    pack: u8,
}

/// A CAH pack
#[derive(Debug, Serialize, Deserialize)]
pub struct CAHCardSet {
    /// Name of the pack
    name: String,
    /// Pack Description
    description: Option<String>,
    /// Whether or not this is an official card pack
    official: bool,
    /// White card data
    white: Option<Vec<CAHCardWhite>>,
    /// Black card data
    black: Option<Vec<CAHCardBlack>>,
}

/// Player roles
#[derive(Debug, Deserialize)]
pub enum PlayerRole {
    /// Player is host
    Host,
    /// Player is a player in a game where another player is host
    Player,
    /// Player is just spectating
    Spectator,
}

/// A struct that represents a player
#[derive(Debug, Deserialize)]
pub struct CAHPlayer {
    /// Player's username
    pub name: String,
    /// This player's role
    pub role: PlayerRole,
    /// The player's hand
    pub white: Vec<CAHCardWhite>,
    /// The player's wins
    pub black: Vec<CAHCardBlack>,
}

/// The game master
#[derive(Default)]
pub struct CAHGame {
    /// The name of the game
    pub name: String,
    /// White draw pile
    pub white: Vec<CAHCardWhite>,
    /// Black draw pile
    pub black: Vec<CAHCardBlack>,
    /// White discard pile
    pub white_discard: Vec<CAHCardWhite>,
    /// Black discard pile
    pub black_discard: Vec<CAHCardBlack>,
    /// Indicates game active/game over
    pub game_active: bool,
    /// List of current players
    pub players: Vec<CAHPlayer>,
    // /// Reference to current card czar
    // czar: &CAHPlayer,
    /// Black card for the current round
    pub current_black: Option<CAHCardBlack>,
}

impl CAHGame {
    /// Build game decks from input data for game start.
    /// This should only run once and at startup.
    fn _build_decks(&mut self, cards_json: Vec<CAHCardSet>) -> Result<()> {
        for pack in cards_json {
            if let Some(white) = pack.white {
                self.white.extend(white)
            }
            if let Some(black) = pack.black {
                self.black.extend(black)
            }
        }

        Ok(())
    }

    pub fn new(request: NewGameRequest) -> Result<Self> {
        let mut game = CAHGame {
            ..Default::default()
        };
        tracing::debug!("Creating game {}", &request.name);
        game.name = request.name;

        // game.build_decks(request.packs)?;
        game.create_player(request.host)?;
        game.deal_black()?;

        Ok(game)
    }

    // pub fn join(request:GameJoinRequest)

    /// Log counts of current drawable cards
    /// For testing
    pub fn deck_counts(&self) {
        tracing::debug!(
            "Deck Counts:\n {} White cards\n {} Black cards",
            self.white.len(),
            self.black.len()
        );
    }

    /// Draw one white card at random from play deck.
    fn draw_one_white(&mut self) -> Result<CAHCardWhite> {
        let deck = &mut self.white;

        // this feels sloppy
        if let Some(index) = (0..deck.len()).choose(&mut thread_rng()) {
            Ok(deck.swap_remove(index))
        } else {
            Ok(CAHCardWhite {
                text: "Error.\n\nbtw if you see this tell me I'm lazy :)".to_string(),
                pack: 0,
            })
        }
    }

    /// Draw one black card at random from play deck.
    fn draw_one_black(&mut self) -> Result<CAHCardBlack> {
        let deck = &mut self.black;

        // this feels sloppy
        if let Some(index) = (0..deck.len()).choose(&mut thread_rng()) {
            Ok(deck.swap_remove(index))
        } else {
            Ok(CAHCardBlack {
                text: "Error.\n\nbtw if you see this tell me I'm lazy :)".to_string(),
                pick: 0,
                pack: 0,
            })
        }
    }

    /// Deal a black card and use it for the current round
    fn deal_black(&mut self) -> Result<()> {
        self.current_black = Some(self.draw_one_black()?);

        Ok(())
    }

    /// Create a new player and add them to the game.
    pub fn create_player(&mut self, mut player: CAHPlayer) -> Result<()> {
        tracing::debug!("Creating player {} as {:?}", &player.name, &player.role);

        let mut hand_buf = vec![];
        for _ in 0..10 {
            hand_buf.push(self.draw_one_white()?);
        }
        tracing::debug!("Dealing hand to {}", &player.name);
        player.white.extend(hand_buf);

        self.players.push(player);

        Ok(())
    }

    pub fn game_start(&mut self) -> Result<()> {
        self.game_active = true;
        tracing::debug!("Game Active!");

        if let Some(black) = &self.current_black {
            tracing::debug!("{}", black.text);
        } else {
            tracing::debug!("YOU DONE FUCKED UP (no current black card)");
        }

        Ok(())
    }
}