1 files changed, 54 insertions, 0 deletions

diff --git a/src/history.rs b/src/history.rs
new file mode 100644
index 0000000..5ef375b
--- /dev/null
+++ b/src/history.rs
@@ -0,0 +1,54 @@
+//! Play history as sent to the client.
+
+use serde::{Deserialize, Serialize};
+
+pub const DEFAULT_HISTORY: u32 = 20;
+pub const MAX_HISTORY: u32 = 50;
+
+/// One settled play. `details` is the game's own audit blob.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct PlayRecord {
+    pub game: String,
+    pub bet: i64,
+    pub winnings: i64,
+    pub balance_after: i64,
+    /// Timestamp as stored in SQLite (`YYYY-MM-DD HH:MM:SS`, UTC).
+    pub at: String,
+    #[serde(default)]
+    pub details: serde_json::Value,
+}
+
+impl PlayRecord {
+    /// Short human summary of the game-specific details.
+    pub fn summary(&self) -> String {
+        let field = |name: &str| -> Option<String> {
+            self.details.get(name).map(|value| match value.as_str() {
+                Some(text) => text.to_string(),
+                None => value.to_string(),
+            })
+        };
+
+        match self.game.as_str() {
+            "slots" => field("win_type").unwrap_or_else(|| "spin".to_string()),
+            "roulette" => match (field("number"), field("color")) {
+                (Some(number), Some(color)) => format!("{number} {color}"),
+                (Some(number), None) => number,
+                _ => String::new(),
+            },
+            "blackjack" => field("result").unwrap_or_default(),
+            "crash" => {
+                let result = field("result").unwrap_or_default();
+                match self.details.get("multiplier").and_then(|value| value.as_f64()) {
+                    Some(multiplier) => format!("{result} {multiplier:.2}x"),
+                    None => result,
+                }
+            }
+            _ => String::new(),
+        }
+    }
+
+    /// `YYYY-MM-DD HH:MM`, dropping the seconds.
+    pub fn short_time(&self) -> &str {
+        self.at.get(..16).unwrap_or(&self.at)
+    }
+}