use std::io::Read;
use std::path::{Path, PathBuf};

use serde::Serialize;

pub mod rom;

#[derive(Serialize)]
pub struct Patch {
    pub address: usize,
    pub patch_data: Vec<u8>,
}

#[derive(Serialize)]
pub struct PatchSet {
    filename: PathBuf,
    patches: Vec<Patch>
}

impl PatchSet {
    pub fn load(filename: Path) -> Result<PatchSet, anyhow::Error> {
        let patches = {
            let mut file = File::open(filename)?;
            let mut buffer = std::io::BufReader::new(file);
            serde_json::from_reader(buffer)?
        };
        PatchSet {
            filename: filename.into(),
            patches: patches
        }
    }

    pub fn filename(&self) -> Path {
        self.filename.as_path()
    }

    pub fn patchRom(&self, &mut rom: RomData) {
        for patch in self.patches {
            rom.patch_data(patch);
        }
    }
}