1 files changed, 82 insertions, 0 deletions
diff --git a/src/app/game/game.stat.ts b/src/app/game/game.stat.ts
new file mode 100644
index 0000000..43136e6
--- /dev/null
+++ b/src/app/game/game.stat.ts
@@ -0,0 +1,82 @@
+export interface GState {
+  displayedLineIdx: number;
+  typedCount: number;
+  lineCompleted: boolean;
+  combo: number;
+  maxCombo: number;
+  score: number;
+  totalCorrect: number;
+  totalMiss: number;
+  linesCleared: number;
+  wpm: number;
+}
+
+export type GAction =
+  | { type: "ADVANCE"; newIdx: number; prevCompleted: boolean }
+  | { type: "CORRECT"; willComplete: boolean }
+  | { type: "WRONG" }
+  | { type: "RESET" };
+
+export const initialGState: GState = {
+  displayedLineIdx: -1,
+  typedCount: 0,
+  lineCompleted: false,
+  combo: 0,
+  maxCombo: 0,
+  score: 0,
+  totalCorrect: 0,
+  totalMiss: 0,
+  linesCleared: 0,
+  wpm: 0,
+};
+
+export function gReducer(state: GState, action: GAction): GState {
+  switch (action.type) {
+    case "ADVANCE": {
+      const prevIdx = state.displayedLineIdx;
+      const comboReset = !action.prevCompleted && prevIdx >= 0;
+      return {
+        ...state,
+        displayedLineIdx: action.newIdx,
+        typedCount: 0,
+        lineCompleted: false,
+        combo: comboReset ? 0 : state.combo,
+      };
+    }
+
+    case "CORRECT": {
+      const newTypedCount = state.typedCount + 1;
+      const newCombo = state.combo + 1;
+      const newMaxCombo = Math.max(state.maxCombo, newCombo);
+      const comboBonus = Math.min(50, Math.floor(newCombo / 10) * 5);
+      const newScore = state.score + 10 + comboBonus;
+      const newTotalCorrect = state.totalCorrect + 1;
+      if (action.willComplete) {
+        return {
+          ...state,
+          typedCount: newTypedCount,
+          lineCompleted: true,
+          combo: newCombo,
+          maxCombo: newMaxCombo,
+          score: newScore,
+          totalCorrect: newTotalCorrect,
+          linesCleared: state.linesCleared + 1,
+        };
+      }
+      return {
+        ...state,
+        typedCount: newTypedCount,
+        combo: newCombo,
+        maxCombo: newMaxCombo,
+        score: newScore,
+        totalCorrect: newTotalCorrect,
+      };
+    }
+    case "WRONG":
+      return { ...state, totalMiss: state.totalMiss + 1, combo: 0 };
+    case "RESET":
+      return { ...initialGState };
+    default:
+      return state;
+  }
+}
+\ No newline at end of file