use rand::prelude::SliceRandom;
use rand::rngs::SmallRng;
use rand::SeedableRng;
use crate::board::{Board, Letter};
use crate::constants::{standard_tile_pool, TRAY_LENGTH};
use crate::dictionary::{Dictionary, DictionaryImpl};
use crate::player_interaction::ai::Difficulty;
use crate::player_interaction::Tray;

pub enum Player {
    Human(String),
    AI{
        name: String,
        difficulty: Difficulty,
    }
}

impl Player {

    pub fn get_name(&self) -> &str {
        match &self {
            Player::Human(name) => {name}
            Player::AI { name, .. } => {name}
        }
    }
}

pub struct PlayerState {
    pub player: Player,
    pub score: u32,
    pub tray: Tray
}

pub struct Game{
    pub tile_pool: Vec<Letter>,
    board: Board,
    pub player_states: Vec<PlayerState>,
    dictionary: DictionaryImpl,
}

// Problem - I want to provide a UI to the player
// Ideally they would get some kind of 'tray' object with methods to use and run
// However I want the main game state to live in Rust, not in JS.
// Does this mean I provide Rc<RefCell<Tray>>?

// Other option - what if I just have one Game object that exposes all methods.
// At no point do they get a Tray reference that auto-updates, they need to handle that
// I just provide read-only JSON of everything, and they call the methods for updates
// This will later work out well when I build it out as an API for multiplayer.

impl Game {
    pub fn new(seed: u64, dictionary_text: &str, mut player_names: Vec<String>) -> Self {
        let mut rng = SmallRng::seed_from_u64(seed);

        let mut letters = standard_tile_pool(Some(&mut rng));

        player_names.shuffle(&mut rng);
        let player_states: Vec<PlayerState> = player_names.iter()
            .map(|name| {
                let mut tray = Tray::new(TRAY_LENGTH);
                tray.fill(&mut letters);
                PlayerState {
                    player: Player::Human(name.clone()),
                    score: 0,
                    tray,
                }
            })
            .collect();

        Game {
            tile_pool: letters,
            board: Board::new(),
            player_states,
            dictionary: DictionaryImpl::create_from_str(dictionary_text)
        }
    }

    pub fn get_player_state(&self, name: &str) -> Option<&PlayerState> {
        self.player_states.iter()
            .filter(|state| state.player.get_name().eq(name))
            .nth(0)

    }

    pub fn get_player_state_mut(&mut self, name: &str) -> Option<&mut PlayerState> {
        self.player_states.iter_mut()
            .filter(|state| state.player.get_name().eq(name))
            .nth(0)

    }

    pub fn get_tray(&self, name: &str) -> Option<&Tray> {
        let player = self.get_player_state(name)?;

        Some(&player.tray)

    }

    pub fn get_tray_mut(&mut self, name: &str) -> Option<&mut Tray> {
        let player = self.get_player_state_mut(name)?;

        Some(&mut player.tray)

    }

    pub fn get_board(&self) -> &Board {&self.board}

    pub fn set_board(&mut self, new_board: Board) {
        self.board = new_board;
    }

    pub fn fill_trays(&mut self){
        for state in self.player_states.iter_mut() {
            let tray = &mut state.tray;
            tray.fill(&mut self.tile_pool);
        }
    }

    pub fn get_dictionary(&self) -> &DictionaryImpl {
        &self.dictionary
    }


}