use serde_derive::{Deserialize, Serialize};
use serde_xml_rs::{from_reader, from_str, to_string};

use std::fs::File;

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Graph {
    order: i32,
    #[serde(rename = "type")]
    game_type: String,
    #[serde(rename = "specific-type")]
    specific_type: String,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Puzzle {
    graph: Graph,
    values: String,
    solution: String,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Game {
    #[serde(rename = "had-help")]
    help: i16,
    #[serde(rename = "msecs-elapsed")]
    elapsed: u32,
    puzzle: Puzzle,
}
#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Ksudoku {
    game: Game,
}

const SIZE: u8 = 9;
const MAX_SIZE: u8 = 81;

#[derive(Debug)]
struct Sudoku {
    board: [u8; MAX_SIZE as usize],
}

const fn pos(x: u8, y: u8) -> u8 {
    x + (y * SIZE as u8)
}

impl Sudoku {
    fn new() -> Self {
        let s = Sudoku {
            board: [0; MAX_SIZE as usize],
        };

        s
    }
    fn clear(&mut self) {
        for x in 0..MAX_SIZE {
            self.board[x as usize] = 0;
        }
    }

    fn load_xsudoku(&mut self, s: &str) {
        self.clear();
        let mut x: u8 = 0;
        let mut y: u8 = 0;
        for ch in s.chars() {
            if ch >= 'b' {
                self.board[pos(x, y) as usize] = ch as u8 - 'a' as u8;
            };
            y += 1;
            if y >= SIZE {
                y = 0;
                x += 1;
            }
        }
    }

    fn display(&self) {
        println!("╔═══╦═══╦═══╗");
        for y in 0..SIZE {
            print!("║");
            for x in 0..SIZE {
                let item = self.board[pos(x as u8, y as u8) as usize];
                if item == 0 {
                    print!(" ");
                } else if (item >= 1) && (item <= 9) {
                    print!("{}", item);
                }
                if x % 3 == 2 {
                    print!("║");
                }
            }
            println!("");
            if y % 3 == 2 {
                if (y + 1 == SIZE) {
                    println!("╚═══╩═══╩═══╝");
                } else {
                    println!("╠═══╬═══╬═══╣");
                }
            }
        }
    }
}
/*
const InRow: [u8; 81] = [1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9,
];
 */

// rows, columns, and cells ?  (maybe?)
// With the ability to know what RCC each item belongs?

#[derive(Debug)]
struct OnlyOne {
    positions: [u8; SIZE as usize],
}

const CELLS: [OnlyOne; 3] = [
    OnlyOne {
        positions: [
            pos(1, 1),
            pos(1, 2),
            pos(1, 3),
            pos(1, 4),
            pos(1, 5),
            pos(1, 6),
            pos(1, 7),
            pos(1, 8),
            pos(1, 9),
        ],
    },
    OnlyOne {
        positions: [
            pos(2, 1),
            pos(2, 2),
            pos(2, 3),
            pos(2, 4),
            pos(2, 5),
            pos(2, 6),
            pos(2, 7),
            pos(2, 8),
            pos(2, 9),
        ],
    },
    OnlyOne {
        positions: [
            pos(3, 1),
            pos(3, 2),
            pos(3, 3),
            pos(3, 4),
            pos(3, 5),
            pos(3, 6),
            pos(3, 7),
            pos(3, 8),
            pos(3, 9),
        ],
    },
];

const POS1: OnlyOne = OnlyOne {
    positions: [0, 1, 2, 3, 4, 5, 6, 7, 8],
};

fn main() {
    let filename = "../puzzle1";
    let fh = File::open(filename).unwrap();

    let puzzle: Ksudoku = from_reader(fh).unwrap();

    println!("Puzzle: {:?}", puzzle);
    println!("CELLS: {:?}", CELLS);
    let mut s = Sudoku::new();
    s.load_xsudoku(&puzzle.game.puzzle.values);
    s.display();
}