feat: add player system

backend/dojo_examples/combat_game/src/models/player.cairo

@@ -11,8 +11,8 @@ pub struct Player {
     pub current_beast_id: u16,
     pub battles_won: u16,
     pub battles_lost: u16,
-    pub last_active_day: u32,
-    pub creation_day: u32,
+    pub last_active_day: u64,
+    pub creation_day: u64,
 }
 
 #[generate_trait]

backend/dojo_examples/combat_game/src/systems/player.cairo

@@ -1 +1,59 @@
+#[starknet::interface]
+pub trait IPlayer<T> {
+    fn spawn_player(ref self: T, initial_beast_id: u16);
+    fn update_profile(ref self: T, won: bool, current_beast_id: u16);
+}
 
+#[dojo::contract]
+pub mod player_system {
+    use super::IPlayer;
+
+    use combat_game::models::player::{Player, PlayerAssert};
+    use combat_game::store::{StoreTrait};
+
+    use starknet::{get_caller_address, get_block_timestamp};
+
+    #[storage]
+    struct Storage {
+        player_counter: u256,
+    }
+
+     // Constructor
+    fn dojo_init(ref self: ContractState) {
+        self.player_counter.write(1);
+    }
+
+    #[abi(embed_v0)]
+    impl PlayerImpl of IPlayer<ContractState> {
+        fn spawn_player(ref self: ContractState, initial_beast_id: u16) {
+            let mut world = self.world(@"combat_game");
+            let mut store = StoreTrait::new(world);
+
+            let found = store.read_player();
+            found.assert_not_exists();
+
+            let player = Player {
+                address: get_caller_address(),
+                current_beast_id: initial_beast_id,
+                battles_won: 0,
+                battles_lost: 0,
+                last_active_day: get_block_timestamp(),
+                creation_day: get_block_timestamp(),
+            };
+
+            store.write_player(player);
+        }
+
+        fn update_profile(ref self: ContractState, won: bool, current_beast_id: u16) {
+            let mut world = self.world(@"combat_game");
+            let mut store = StoreTrait::new(world);
+
+            let mut player = store.read_player();
+            player.assert_exists();
+
+            store.update_player_battle_result(won);
+            player.current_beast_id = current_beast_id;
+            store.write_player(player);
+        }
+    }
+}