1 files changed, 113 insertions, 0 deletions
diff --git a/src/world/mod.rs b/src/world/mod.rs
new file mode 100644
index 0000000..047ca5c
--- /dev/null
+++ b/src/world/mod.rs
@@ -0,0 +1,113 @@
+//! The world contains all items of a session and the ways to manipulate them.
+//! Generally speaking, manipulation will be done on the server side and then
+//! the changes are sent to the client.
+
+pub mod component;
+pub mod icon;
+pub mod room;
+pub mod wall;
+
+pub use component::*;
+pub use icon::*;
+pub use room::*;
+pub use wall::*;
+
+use crate::stable_vec::StableVec;
+use ron::de::from_reader;
+use ron::ser::{to_string_pretty, PrettyConfig};
+use serde::{Deserialize, Serialize};
+use std::fs::File;
+use std::io::{self, Write};
+use std::path::Path;
+
+/// Main structure that contains all information about a world necessary to argue
+/// about structures in it. It can be persistified and loaded from disk, as well
+/// as sent over the network. Everything in it is assigned an id to make it easy
+/// to argue about a specific item. IDs may only be assigned by the server, not
+/// the client, since otherwise multiple clients may try to create the same item.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct World {
+    rooms: StableVec<Room>,
+    walls: StableVec<Wall>,
+    icons: StableVec<Icon>,
+    used_ids: StableVec<()>,
+}
+
+impl World {
+    /// Load the world data from a file. Fails if the file does not exist or
+    /// cannot be correctly parsed.
+    pub fn load_from_file<P: AsRef<Path>>(path: P) -> io::Result<Self> {
+        let file = File::open(&path)?;
+        let data: Self = match from_reader(file) {
+            Ok(data) => data,
+            Err(err) => {
+                return Err(io::Error::new(io::ErrorKind::InvalidData, err));
+            }
+        };
+
+        Ok(data)
+    }
+
+    /// Write the world data to the file located at `path`. If the file already
+    /// exists, it will be overwritten. If the write fails, an IO-Error is returned.
+    pub fn write_to_file<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
+        let mut file = File::create(&path)?;
+
+        let pretty_conf = PrettyConfig::new()
+            .with_depth_limit(4)
+            .with_decimal_floats(true)
+            .with_separate_tuple_members(true)
+            .with_indentor("\t".to_owned());
+        let string = match to_string_pretty(&self, pretty_conf) {
+            Ok(string) => string,
+            Err(err) => {
+                return Err(io::Error::new(io::ErrorKind::InvalidInput, err));
+            }
+        };
+
+        file.write_all(&string.as_bytes())
+    }
+
+    /// Add a room to the world. Currently, holes are not supported in the polygon, but this might
+    /// change later.
+    pub fn push_room(&mut self, room: Room) -> usize {
+        let id = self.used_ids.insert_anywhere(());
+        self.rooms
+            .try_insert(id, room)
+            .expect("Id vecs out of sync");
+        id
+    }
+
+    /// Add a wall to the world.
+    pub fn push_wall(&mut self, wall: Wall) -> usize {
+        let id = self.used_ids.insert_anywhere(());
+        self.walls
+            .try_insert(id, wall)
+            .expect("Id vecs out of sync");
+        id
+    }
+
+    /// Add an icon to the world.
+    pub fn push_icon(&mut self, icon: Icon) -> usize {
+        let id = self.used_ids.insert_anywhere(());
+        self.icons
+            .try_insert(id, icon)
+            .expect("Id vecs out of sync");
+        id
+    }
+
+    /// Get all icons of the world.
+    pub fn icons(&self) -> &StableVec<Icon> {
+        &self.icons
+    }
+
+    /// Get all rooms of the world.
+    pub fn rooms(&self) -> &StableVec<Room> {
+        &self.rooms
+    }
+
+    /// Get all walls of the world.
+    pub fn walls(&self) -> &StableVec<Wall> {
+        &self.walls
+    }
+}