Merge pull request #5 from SkyNet1748/MrXiaoM-patch-2

添加经济接口

src/main/kotlin/io/github/skynet1748/mirai/economy/IEconomyService.kt

@@ -0,0 +1,73 @@
+package io.github.skynet1748.mirai.economy
+
+/**
+ * 经济服务，用于存取数据和获取经济上下文
+ */
+public interface IEconomyService {
+    public fun getGlobalContext(): IEconomyContextGlobal
+    public fun getGroupContext(groupId: Long): IEconomyContextGroup
+}
+
+/**
+ * 经济上下文，用于区分当前环境分开存取用户数据
+ */
+public interface IEconomyContext {
+    /**
+     * 该上下文的显示名称
+     */
+    public val name: String
+    public val service: IEconomyService
+
+    /**
+     * 创建账户
+     */
+    public fun createAccount(userId: Long, money: Double = 0.0)
+
+    /**
+     * 查询是否有该账户
+     */
+    public fun hasAccount(userId: Long): Boolean
+
+    /**
+     * 列出账户列表
+     * @param count 列出的数量，0为无限制
+     */
+    public fun listAccounts(count: Int = 0): List<Long>
+
+    /**
+     * 查询账户是否有足够的钱 (余额 >= money)
+     */
+    public fun has(userId: Long, money: Double): Boolean
+
+    /**
+     * 获取账户余额
+     */
+    public fun get(userId: Long): Double
+
+    /**
+     * 设置账户余额
+     */
+    public fun set(userId: Long, money: Double)
+
+    /**
+     * 将钱存入账户
+     */
+    public fun increase(userId: Long, money: Double): Double
+
+    /**
+     * 从账户中取钱
+     */
+    public fun decrease(userId: Long, money: Double): Double
+}
+
+/**
+ * 全局上下文，适用于好友等非群聊环境
+ */
+public interface IEconomyContextGlobal : IEconomyContext
+
+/**
+ * 群聊上下文，适用于群聊环境
+ */
+public interface IEconomyContextGroup : IEconomyContext {
+    public val groupId: Long
+}