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use std::path::{PathBuf};
use std::fs;
use std::env;
use std::io::ErrorKind;
use serde_json;
use serde_json::{Value, json};
use crate::{
PlayerId,
RoomId,
savestate::SaveState,
playerstate::PlayerState,
Timestamp,
aerr,
errors::AnyError,
util::write_file_safe
};
pub enum LoaderError {
MissingResource(AnyError),
InvalidResource(AnyError)
}
macro_rules! inv {
($code:expr) => {($code).map_err(|err| LoaderError::InvalidResource(Box::new(err)))}
}
pub trait PersistentStorage {
fn load_room(&self, id: RoomId) -> Result<SaveState, LoaderError>;
fn load_player(&self, id: PlayerId) -> Result<PlayerState, LoaderError>;
fn load_world_meta(&self) -> Result<Timestamp, LoaderError>;
fn save_room(&self, id: RoomId, state: SaveState) -> Result<(), AnyError>;
fn save_player(&self, id: PlayerId, sate: PlayerState) -> Result<(), AnyError>;
fn save_world_meta(&self, time: Timestamp) -> Result<(), AnyError>;
}
pub struct FileStorage {
directory: PathBuf
}
impl FileStorage {
pub fn new(path: PathBuf) -> Self {
Self {
directory: path
}
}
pub fn default_save_dir() -> Option<PathBuf> {
if let Some(pathname) = env::var_os("XDG_DATA_HOME") {
let mut path = PathBuf::from(pathname);
path.push("asciifarm");
path.push("saves");
Some(path)
} else if let Some(pathname) = env::var_os("HOME") {
let mut path = PathBuf::from(pathname);
path.push(".asciifarm");
path.push("saves");
Some(path)
} else {
None
}
}
}
impl PersistentStorage for FileStorage {
fn load_room(&self, id: RoomId) -> Result<SaveState, LoaderError> {
let mut path = self.directory.clone();
path.push("rooms");
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = fs::read_to_string(path).map_err(|err| {
if err.kind() == ErrorKind::NotFound {
LoaderError::MissingResource(Box::new(err))
} else {
LoaderError::InvalidResource(Box::new(err))
}
})?;
let state = inv!(serde_json::from_str(&text))?;
Ok(state)
}
fn load_player(&self, id: PlayerId) -> Result<PlayerState, LoaderError> {
let mut path = self.directory.clone();
path.push("players");
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = fs::read_to_string(path).map_err(|err| {
if err.kind() == ErrorKind::NotFound {
LoaderError::MissingResource(Box::new(err))
} else {
LoaderError::InvalidResource(Box::new(err))
}
})?;
let state = inv!(serde_json::from_str(&text))?;
Ok(state)
}
fn load_world_meta(&self) -> Result<Timestamp, LoaderError> {
let mut path = self.directory.clone();
path.push("world.save.json");
let text = fs::read_to_string(path).map_err(|err| {
if err.kind() == ErrorKind::NotFound {
LoaderError::MissingResource(Box::new(err))
} else {
LoaderError::InvalidResource(Box::new(err))
}
})?;
let json: Value = inv!(serde_json::from_str(&text))?;
Ok(
Timestamp(
inv!(inv!(json
.get("steps").ok_or(aerr!("world data does not have steps")))?
.as_i64().ok_or(aerr!("timestamp not an int")))?
)
)
}
fn save_room(&self, id: RoomId, state: SaveState) -> Result<(), AnyError> {
let mut path = self.directory.clone();
path.push("rooms");
fs::create_dir_all(&path)?;
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = serde_json::to_string(&state).unwrap();
write_file_safe(path, text)?;
Ok(())
}
fn save_player(&self, id: PlayerId, state: PlayerState) -> Result<(), AnyError> {
let mut path = self.directory.clone();
path.push("players");
fs::create_dir_all(&path)?;
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = serde_json::to_string(&state).unwrap();
write_file_safe(path, text)?;
Ok(())
}
fn save_world_meta(&self, time: Timestamp) -> Result<(), AnyError> {
let mut path = self.directory.clone();
fs::create_dir_all(&path)?;
path.push("world.save.json");
write_file_safe(path, json!({"steps": time.0}).to_string())?;
Ok(())
}
}
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