// Read a Ksudoku's XML save file.

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

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())
}

pub fn save_ksudoku(filename: std::path::PathBuf, puz: &String, sol: &String) -> Result<(), Box<dyn Error>> {
    /*
    let pStr: String = puzzle.save_to_tld(start_ch: 'b', blank: '_');
    let solStr: solution.save_to_tld(start_ch: 'b', blank: '_');
    */
    let ksudoko = Ksudoku {
        game: Game {
            help: 0,
            elapsed: 0,
            puzzle: Puzzle {
                graph: Graph {
                    order: 9,
                    game_type: String::from("sudoku"),
                    specific_type: String::from("Plain"),
                },
                values: puz.to_string(),
                solution: sol.to_string(),
            },
        },
    };
    let fh = File::create(filename)?;
    let _res = to_writer(fh, &ksudoko)?;

    Ok(())
}