From 5775438039581797f402d53b11447d73b7cf1edd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=A1rallyay=5FM=C3=A1t=C3=A9?=
 <mate.varallyay@edu.bme.hu>
Date: Mon, 15 Jul 2024 21:59:40 +0200
Subject: [PATCH] Fixed the calculation and implemented alcohol elimination

---
 apps/backend/src/users/users.service.ts | 46 ++++++++++++++++---------
 1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/apps/backend/src/users/users.service.ts b/apps/backend/src/users/users.service.ts
index 84e7cab..b4abcbb 100644
--- a/apps/backend/src/users/users.service.ts
+++ b/apps/backend/src/users/users.service.ts
@@ -38,39 +38,53 @@ export class UsersService {
     return await this.prisma.user.findMany({ omit: { weight: true } });
   }
 
-  private calculateHoursSinceDrink(drinkTime: Date, currentTime: Date): number {
-    const timeDifference = currentTime.getTime() - drinkTime.getTime();
-    return timeDifference / (1000 * 60 * 60);
-  }
-
   async calBac(authSchId: string): Promise<UserBac> {
-    const drinkActions = await this.prisma.drinkAction.findMany({
-      // where: { authSchId },
-      include: { drink: { select: { alcoholContent: true } } },
+    const user = await this.prisma.user.findUnique({
+      where: { authSchId },
+      select: { weight: true, gender: true },
     });
 
+    if (!user) {
+      throw new NotFoundException('User not found');
+    }
+
     const currentTime = new Date();
+    const userWeightInGrams = user.weight * 1000;
+    const genderFactor = user.gender === 'Male' ? 0.68 : 0.55;
 
-    const user = await this.prisma.user.findUnique({ where: { authSchId }, select: { weight: true, gender: true } });
+    const drinkActions = await this.prisma.drinkAction.findMany({
+      // where: { authSchId },
+      include: { drink: { select: { alcoholContent: true } } },
+    });
 
     let totalDose = 0;
-    let totalEliminatedAlcohol = 0;
+    const totalEliminatedAlcohol = this.calculateHoursSinceFirstDrink(drinkActions, currentTime) * 0.016;
 
     for (const drinkAction of drinkActions) {
-      const dose = drinkAction.milliliter * drinkAction.drink.alcoholContent * 0.789;
-      const hoursSinceDrink = this.calculateHoursSinceDrink(drinkAction.createdAt, currentTime);
-      const eliminatedAlcohol = hoursSinceDrink * 0.016;
+      const dose = drinkAction.milliliter * (drinkAction.drink.alcoholContent / 100) * 0.789;
       totalDose += dose;
-      totalEliminatedAlcohol += eliminatedAlcohol;
     }
 
-    const userWeightInGrams = user.weight * 1000;
-    const genderFactor = user.gender === 'Male' ? 0.68 : 0.55;
+    totalDose = Math.max(0, totalDose);
     const bac = (totalDose / (userWeightInGrams * genderFactor)) * 100;
 
     return { alcoholContent: Math.max(0, bac - totalEliminatedAlcohol) };
   }
 
+  private calculateHoursSinceFirstDrink(drinkActions: any[], currentTime: Date): number {
+    if (drinkActions.length === 0) {
+      return 0;
+    }
+
+    drinkActions.sort((a, b) => a.createdAt.getTime() - b.createdAt.getTime());
+
+    const firstDrinkTime = drinkActions[0].createdAt;
+    const timeDifferenceMs = currentTime.getTime() - firstDrinkTime.getTime();
+    const hoursDifference = timeDifferenceMs / (1000 * 60 * 60);
+
+    return hoursDifference;
+  }
+
   async remove(authSchId: string): Promise<User> {
     try {
       return await this.prisma.user.delete({ where: { authSchId } });