1 files changed, 111 insertions, 0 deletions
diff --git a/planetwars-rules/src/lib.rs b/planetwars-rules/src/lib.rs
new file mode 100644
index 0000000..29c7b28
--- /dev/null
+++ b/planetwars-rules/src/lib.rs
@@ -0,0 +1,111 @@
+#[macro_use]
+extern crate serde;
+extern crate serde_json;
+
+pub mod config;
+pub mod protocol;
+pub mod rules;
+pub mod serializer;
+
+use std::collections::HashMap;
+pub use rules::{PwState, Dispatch};
+pub use protocol::CommandError;
+pub use config::Config as PwConfig;
+
+pub struct PlanetWars {
+    /// Game state
+    state: rules::PwState,
+    /// Map planet names to their ids
+    planet_map: HashMap<String, usize>
+}
+
+impl PlanetWars {
+    pub fn create(config: PwConfig, num_players: usize) -> Self {
+        let state = config.create_state(num_players);
+
+        let planet_map = state
+            .planets
+            .iter()
+            .map(|p| (p.name.clone(), p.id))
+            .collect();
+        
+        PlanetWars { state, planet_map }
+    }
+
+    /// Proceed to next turn
+    pub fn step(&mut self) {
+        self.state.repopulate();
+        self.state.step();
+    }
+
+    pub fn is_finished(&self) -> bool {
+        self.state.is_finished()
+    }
+
+    pub fn serialize_state(&self) -> protocol::State {
+        serializer::serialize(&self.state)
+    }
+
+    pub fn serialize_player_state(&self, player_id: usize) -> protocol::State {
+        serializer::serialize_rotated(&self.state, player_id - 1)
+    }
+
+    pub fn state<'a>(&'a self) -> &'a PwState {
+        &self.state
+    }
+
+    /// Execute a command
+    pub fn execute_command(
+        &mut self,
+        player_num: usize,
+        cmd: &protocol::Command
+    ) -> Result<(), CommandError>
+    {
+        let dispatch = self.parse_command(player_num, cmd)?;
+        self.state.dispatch(&dispatch);
+        return Ok(());
+    }
+
+    /// Check the given command for validity.
+    /// If it is valid, return an internal representation of the dispatch
+    /// described by the command.
+    pub fn parse_command(&self, player_id: usize, cmd: &protocol::Command)
+        -> Result<Dispatch, CommandError>
+    {
+        let origin_id = *self
+        .planet_map
+        .get(&cmd.origin)
+        .ok_or(CommandError::OriginDoesNotExist)?;
+
+        let target_id = *self
+            .planet_map
+            .get(&cmd.destination)
+            .ok_or(CommandError::DestinationDoesNotExist)?;
+
+        if self.state.planets[origin_id].owner() != Some(player_id - 1) {
+            println!("owner was {:?}", self.state.planets[origin_id].owner());
+            return Err(CommandError::OriginNotOwned);
+        }
+
+        if self.state.planets[origin_id].ship_count() < cmd.ship_count {
+            return Err(CommandError::NotEnoughShips);
+        }
+
+        if cmd.ship_count == 0 {
+            return Err(CommandError::ZeroShipMove);
+        }
+
+        Ok(Dispatch {
+            origin: origin_id,
+            target: target_id,
+            ship_count: cmd.ship_count,
+        })
+    }
+
+    /// Execute a dispatch.
+    /// This assumes the dispatch is valid. You should check this yourself
+    /// or use `parse_command` to obtain a valid dispatch.
+    pub fn execute_dispatch(&mut self, dispatch: &Dispatch) {
+        self.state.dispatch(dispatch);
+    }
+}
+\ No newline at end of file