add: user coins and transactions

crates/core/src/model/auth.rs

@@ -92,6 +92,9 @@ pub struct User {
     /// The time at which the user's ban will automatically expire.
     #[serde(default)]
     pub ban_expire: usize,
+    /// The number of coins the user has.
+    #[serde(default)]
+    pub coins: i32,
 }
 
 pub type UserConnections =
@@ -397,6 +400,7 @@ impl User {
             channel_mutes: Vec::new(),
             is_deactivated: false,
             ban_expire: 0,
+            coins: 0,
         }
     }
 

crates/core/src/model/economy.rs

@@ -0,0 +1,36 @@
+use serde::{Serialize, Deserialize};
+use tetratto_shared::{snow::Snowflake, unix_epoch_timestamp};
+
+use super::auth::User;
+
+#[derive(Serialize, Deserialize)]
+pub struct CoinTransfer {
+    pub id: usize,
+    pub created: usize,
+    pub sender: usize,
+    pub receiver: usize,
+    pub amount: i32,
+}
+
+impl CoinTransfer {
+    /// Create a new [`CoinTransfer`].
+    pub fn new(sender: usize, receiver: usize, amount: i32) -> Self {
+        Self {
+            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
+            created: unix_epoch_timestamp(),
+            sender,
+            receiver,
+            amount,
+        }
+    }
+
+    /// Apply the effects of this transaction onto the sender and receiver balances.
+    ///
+    /// # Returns
+    /// `(sender bankrupt, receiver bankrupt)`
+    pub fn apply(&self, sender: &mut User, receiver: &mut User) -> (bool, bool) {
+        sender.coins -= self.amount;
+        receiver.coins += self.amount;
+        (sender.coins < 0, receiver.coins < 0)
+    }
+}

crates/core/src/model/mod.rs

@@ -5,6 +5,7 @@ pub mod carp;
 pub mod channels;
 pub mod communities;
 pub mod communities_permissions;
+pub mod economy;
 pub mod journals;
 pub mod littleweb;
 pub mod mail;