// Read a Ksudoku's XML save file.

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

use std::error::Error;
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,
}

pub fn load_ksudoku(filename: std::path::PathBuf) -> Result<String, Box<dyn Error>> {
    let fh = File::open(filename)?;
    let puzzle: Ksudoku = from_reader(fh)?;
    Ok(puzzle.game.puzzle.values.clone())
}