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use std::path::PathBuf;
use std::fs;
use serde_json;
use serde_json::Value;
use crate::{
PlayerId,
savestate::SaveState,
playerstate::PlayerState,
util::Result,
aerr
};
pub trait PersistentStorage {
fn load_room(&self, name: String) -> Result<SaveState>;
fn load_player(&self, id: PlayerId) -> Result<PlayerState>;
fn save_room(&self, name: String, state: SaveState) -> Result<()>;
fn save_player(&self, id: PlayerId, sate: PlayerState) -> Result<()>;
}
pub struct FileStorage {
directory: PathBuf
}
impl FileStorage {
pub fn new(path: &str) -> Self {
Self {
directory: PathBuf::from(path)
}
}
}
impl PersistentStorage for FileStorage {
fn load_room(&self, name: String) -> Result<SaveState> {
let mut path = self.directory.clone();
path.push("rooms");
let fname = name + ".save.json";
path.push(fname);
let text = fs::read_to_string(path)?;
let json: Value = serde_json::from_str(&text)?;
SaveState::from_json(&json).ok_or(aerr!("not a valid save state"))
}
fn load_player(&self, id: PlayerId) -> Result<PlayerState> {
let mut path = self.directory.clone();
path.push("players");
let fname = id.name + ".save.json";
path.push(fname);
let text = fs::read_to_string(path)?;
let json: Value = serde_json::from_str(&text)?;
PlayerState::from_json(&json).ok_or(aerr!("not a valid save state"))
}
fn save_room(&self, name: String, state: SaveState) -> Result<()> {
let mut path = self.directory.clone();
path.push("rooms");
fs::create_dir_all(&path)?;
let fname = name + ".save.json";
path.push(fname);
let text = state.to_json().to_string();
// todo: write to a temp file first
fs::write(path, text)?;
Ok(())
}
fn save_player(&self, id: PlayerId, state: PlayerState) -> Result<()> {
let mut path = self.directory.clone();
path.push("players");
fs::create_dir_all(&path)?;
let fname = id.name + ".save.json";
path.push(fname);
let text = state.to_json().to_string();
// todo: write to a temp file first
fs::write(path, text)?;
Ok(())
}
}
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