feat: add niuzi bank commands

src/main/kotlin/cn/rtast/fancybot/util/file/NiuziBankManager.kt

@@ -0,0 +1,84 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/9/24
+ */
+
+
+package cn.rtast.fancybot.util.file
+
+import cn.rtast.fancybot.entity.db.NiuziBankAccount
+import cn.rtast.fancybot.entity.db.NiuziBankTable
+import cn.rtast.fancybot.entity.db.NiuziBankTable.balance
+import cn.rtast.fancybot.entity.db.NiuziBankTable.interestRate
+import cn.rtast.fancybot.entity.db.NiuziBankTable.timestamp
+import cn.rtast.fancybot.entity.db.NiuziBankTable.userId
+import cn.rtast.fancybot.entity.db.NiuziTable
+import cn.rtast.fancybot.util.suspendedTransaction
+import org.jetbrains.exposed.sql.insert
+import org.jetbrains.exposed.sql.selectAll
+import org.jetbrains.exposed.sql.update
+import java.time.Instant
+
+class NiuziBankManager {
+
+    suspend fun getUser(id: Long): NiuziBankAccount? {
+        return suspendedTransaction {
+            NiuziBankTable.selectAll().where { userId eq id }.map {
+                NiuziBankAccount(
+                    it[userId],
+                    it[balance],
+                    it[interestRate],
+                    it[timestamp]
+                )
+            }.singleOrNull()
+        }
+    }
+
+    private suspend fun increaseBalance(id: Long, amount: Double) {
+        val current = this.getUser(id)
+        suspendedTransaction {
+            NiuziBankTable.update({ userId eq id }) {
+                it[balance] = current?.balance!! + amount
+                it[NiuziTable.timestamp] = Instant.now().epochSecond
+            }
+        }
+    }
+
+    private suspend fun decreaseBalance(id: Long, amount: Double) {
+        this.increaseBalance(id, -amount)
+    }
+
+    suspend fun createBlankAccount(id: Long) {
+        suspendedTransaction {
+            NiuziBankTable.insert {
+                it[userId] = id
+                it[balance] = 0.0
+                it[timestamp] = Instant.now().epochSecond
+                it[interestRate] = 0.54
+            }
+        }
+    }
+
+    suspend fun withdraw(id: Long, amount: Double): NiuziBankAccount {
+        suspendedTransaction {
+            this.decreaseBalance(id, amount)
+        }
+        return this.getUser(id)!!
+    }
+
+    suspend fun deposit(id: Long, amount: Double): NiuziBankAccount {
+        suspendedTransaction {
+            this.increaseBalance(id, amount)
+        }
+        return this.getUser(id)!!
+    }
+
+    suspend fun transfer(from: Long, target: Long, amount: Double): NiuziBankAccount? {
+        suspendedTransaction {
+            this.decreaseBalance(from, -amount)
+            this.increaseBalance(target, amount)
+        }
+        return this.getUser(from)
+    }
+}

src/main/kotlin/cn/rtast/fancybot/util/file/NiuziManager.kt

@@ -12,7 +12,6 @@ import cn.rtast.fancybot.entity.db.NiuziTable
 import cn.rtast.fancybot.entity.db.NiuziTable.length
 import cn.rtast.fancybot.entity.db.NiuziTable.timestamp
 import cn.rtast.fancybot.entity.db.NiuziTable.userId
-import cn.rtast.fancybot.entity.db.SignTable
 import cn.rtast.fancybot.util.isSameDay
 import cn.rtast.fancybot.util.suspendedTransaction
 import org.jetbrains.exposed.sql.insert
@@ -23,13 +22,14 @@ import kotlin.random.Random
 
 class NiuziManager {
 
-    suspend fun updateLength(id: Long, newLength: Double) {
+    suspend fun updateLength(id: Long, newLength: Double): Niuzi? {
         val current = getUser(id)
         suspendedTransaction {
             NiuziTable.update({ userId eq id }) {
                 it[length] = current?.length!! + newLength
             }
         }
+        return getUser(id)
     }
 
     suspend fun createBlankUser(id: Long) {