From df227607ad539ad0bc209eebed917d0a7b356bed Mon Sep 17 00:00:00 2001
From: Moriz Wahl <moriz.wahl@gmx.de>
Date: Thu, 7 Jul 2022 17:27:50 +0200
Subject: [PATCH] get basic statistics from database

---
 .../graphql/resolver/StatisticsResolver.ts    | 71 ++++++++++++++++---
 1 file changed, 61 insertions(+), 10 deletions(-)

diff --git a/backend/src/graphql/resolver/StatisticsResolver.ts b/backend/src/graphql/resolver/StatisticsResolver.ts
index a90d42f75..4c1500839 100644
--- a/backend/src/graphql/resolver/StatisticsResolver.ts
+++ b/backend/src/graphql/resolver/StatisticsResolver.ts
@@ -1,26 +1,77 @@
-import { Resolver, Query, Arg, Args, Authorized, Ctx, Int } from 'type-graphql'
+import { Resolver, Query, Authorized } from 'type-graphql'
 import { RIGHTS } from '@/auth/RIGHTS'
 import { CommunityStatistics } from '@model/CommunityStatistics'
 import { User as DbUser } from '@entity/User'
+import { Transaction as DbTransaction } from '@entity/Transaction'
 import { getConnection } from '@dbTools/typeorm'
 import Decimal from 'decimal.js-light'
+import { calculateDecay } from '@/util/decay'
 
 @Resolver()
 export class StatisticsResolver {
   @Authorized([RIGHTS.COMMUNITY_STATISTICS])
   @Query(() => CommunityStatistics)
   async communityStatistics(): Promise<CommunityStatistics> {
-    const totalUsers = await DbUser.find({ withDeleted: true })
-    console.log(totalUsers.length)
+    const allUsers = await DbUser.find({ withDeleted: true })
+
+    let totalUsers = 0
+    let activeUsers = 0
+    let deletedUsers = 0
+
+    let totalGradidoAvailable: Decimal = new Decimal(0)
+    let totalGradidoUnbookedDecayed: Decimal = new Decimal(0)
+
+    const receivedCallDate = new Date()
+
+    for (let i = 0; i < allUsers.length; i++) {
+      if (allUsers[i].deletedAt) {
+        deletedUsers++
+      } else {
+        totalUsers++
+        const lastTransaction = await DbTransaction.findOne({
+          where: { userId: allUsers[i].id },
+          order: { balanceDate: 'DESC' },
+        })
+        if (lastTransaction) {
+          activeUsers++
+          const decay = calculateDecay(
+            lastTransaction.balance,
+            lastTransaction.balanceDate,
+            receivedCallDate,
+          )
+          if (decay) {
+            totalGradidoAvailable = totalGradidoAvailable.plus(decay.balance.toString())
+            totalGradidoUnbookedDecayed = totalGradidoUnbookedDecayed.plus(decay.decay.toString())
+          }
+        }
+      }
+    }
+
+    const queryRunner = getConnection().createQueryRunner()
+    await queryRunner.connect()
+
+    const { totalGradidoCreated } = await queryRunner.manager
+      .createQueryBuilder()
+      .select('SUM(transaction.amount) AS totalGradidoCreated')
+      .from(DbTransaction, 'transaction')
+      .where('transaction.typeId = 1')
+      .getRawOne()
+
+    const { totalGradidoDecayed } = await queryRunner.manager
+      .createQueryBuilder()
+      .select('SUM(transaction.decay) AS totalGradidoDecayed')
+      .from(DbTransaction, 'transaction')
+      .where('transaction.decay IS NOT NULL')
+      .getRawOne()
 
     return {
-      totalUsers: 12,
-      activeUsers: 6,
-      deletedUsers: 1,
-      totalGradidoCreated: new Decimal(3000),
-      totalGradidoDecayed: new Decimal(200),
-      totalGradidoAvailable: new Decimal(2800),
-      totalGradidoUnbookedDecayed: new Decimal(200),
+      totalUsers,
+      activeUsers,
+      deletedUsers,
+      totalGradidoCreated,
+      totalGradidoDecayed,
+      totalGradidoAvailable,
+      totalGradidoUnbookedDecayed,
     }
   }
 }