1 files changed, 77 insertions, 0 deletions
diff --git a/src/persistence.rs b/src/persistence.rs
new file mode 100644
index 0000000..fc04378
--- /dev/null
+++ b/src/persistence.rs
@@ -0,0 +1,77 @@
+
+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 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(())
+	}
+}
+