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//! Module for ruling in the game of go.

use crate::pieces::stones::{Color, Stone};
use crate::pieces::util::coord::Coord;
use crate::rules::game::Game;
use std::ops::Not;

pub mod game;
mod sgf_bridge;

#[derive(Debug, Clone, PartialEq, Eq, Copy)]
pub enum Player {
    White,
    Black,
}

impl Not for Player {
    type Output = Player;

    fn not(self) -> Self::Output {
        match self {
            Player::Black => Player::White,
            Player::White => Player::Black,
        }
    }
}

impl Player {
    pub fn get_stone_color(self) -> Color {
        match self {
            Player::Black => Color::Black,
            Player::White => Color::White,
        }
    }
}

#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum GobanSizes {
    Nineteen,
    Nine,
    Thirteen,
}

impl Into<usize> for GobanSizes {
    fn into(self) -> usize {
        match self {
            GobanSizes::Nine => 9,
            GobanSizes::Thirteen => 13,
            GobanSizes::Nineteen => 19,
        }
    }
}

impl From<usize> for GobanSizes {
    fn from(x: usize) -> Self {
        match x {
            9 => GobanSizes::Nine,
            13 => GobanSizes::Thirteen,
            19 => GobanSizes::Nineteen,
            _ => panic!("Not implemented for others size than 9,13,19"),
        }
    }
}

/// Enum for playing in the Goban.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Move {
    Pass,
    Resign(Player),
    Play(usize, usize),
}

impl From<Coord> for Move {
    fn from(x: (usize, usize)) -> Self {
        Move::Play(x.0, x.1)
    }
}

#[derive(Debug, Clone, PartialEq, Copy)]
pub enum EndGame {
    WinnerByScore(Player, f32),
    WinnerByResign(Player),
    WinnerByTime(Player),
    WinnerByForfeit(Player),
    Draw,
}

impl EndGame {
    ///
    /// Return the winner of the game, if none the game is draw.
    ///
    pub fn get_winner(self) -> Option<Player> {
        match self {
            EndGame::WinnerByScore(p, _) => Some(p),
            EndGame::WinnerByResign(p) => Some(p),
            EndGame::WinnerByTime(p) => Some(p),
            EndGame::WinnerByForfeit(p) => Some(p),
            EndGame::Draw => None,
        }
    }
}

#[derive(Clone, Eq, PartialEq, Debug)]
pub enum PlayError {
    Ko,
    Suicide,
    GamePaused,
}

///
/// This enum describes the rules for the game.
/// for example in chinese rules we don't count prisoners.
///
#[derive(Clone, Eq, PartialEq, Debug, Copy)]
pub enum Rule {
    Japanese,
    Chinese,
}

impl Rule {
    ///
    /// Count the points of the game
    ///
    pub fn count_points(self, game: &Game) -> (f32, f32) {
        match self {
            Rule::Japanese => {
                let mut scores = game.goban().calculate_territories();
                scores.0 += game.prisoners().0 as f32;
                scores.1 += game.prisoners().1 as f32;
                scores.1 += game.komi();

                scores
            }
            Rule::Chinese => {
                // Territories in seki are not counted
                let mut scores = game.goban().calculate_territories();
                let ns = game.goban().number_of_stones();
                scores.0 += ns.0 as f32;
                scores.1 += ns.1 as f32;
                scores.1 += game.komi();
                scores
            }
        }
    }
    ///
    /// Specify the constraints in the move validation by rule.
    ///
    pub fn move_validation(self, game: &Game, stone: Stone) -> Option<PlayError> {
        match self {
            Rule::Japanese | Rule::Chinese => {
                if game.is_suicide(stone) {
                    Some(PlayError::Suicide)
                } else if game.ko(stone) {
                    Some(PlayError::Ko)
                } else {
                    None
                }
            }
        }
    }

    pub fn is_suicide_valid(self) -> bool {
        false
    }

    pub fn from_sgf_code(s: &str) -> Result<Rule, String> {
        match s {
            "JAP" => Ok(Rule::Japanese),
            "CHI" => Ok(Rule::Chinese),
            _ => Err("The rule is not implemented yet.".to_string()),
        }
    }
}