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suixinkan/App/State/PermissionContext.swift

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+//
+//  PermissionContext.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/6/22.
+//
+
+import Foundation
+import Observation
+
+@MainActor
+@Observable
+/// 权限上下文状态中心，保存角色权限、当前角色和扁平化权限 URI。
+final class PermissionContext {
+    private(set) var rolePermissions: [RolePermissionResponse] = []
+    private(set) var permissionURIs: Set<String> = []
+    var currentRole: RoleInfo?
+
+    /// 替换角色权限列表，并尽量按缓存角色 ID 保持当前角色。
+    func replaceRolePermissions(_ rolePermissions: [RolePermissionResponse], currentRoleId: Int? = nil) {
+        self.rolePermissions = rolePermissions
+        currentRole = currentRoleId.flatMap { id in
+            rolePermissions.first { $0.role.id == id }?.role
+        } ?? currentRole.flatMap { role in
+            rolePermissions.first { $0.role.id == role.id }?.role
+        } ?? rolePermissions.first?.role
+        permissionURIs = Set(Self.flattenPermissions(currentRole?.permission ?? []))
+    }
+
+    /// 切换当前角色，并同步账号上下文中的景区和门店选择。
+    func selectRole(id roleId: Int, accountContext: AccountContext) {
+        guard let rolePermission = rolePermissions.first(where: { $0.role.id == roleId }) else { return }
+        currentRole = rolePermission.role
+        permissionURIs = Set(Self.flattenPermissions(rolePermission.role.permission))
+
+        let scenicScopes = Self.uniqueScenicScopes(from: rolePermission.scenic)
+        accountContext.replaceScopes(
+            scenic: scenicScopes,
+            stores: accountContext.storeScopes,
+            currentScenicId: accountContext.currentScenic?.id,
+            currentStoreId: accountContext.currentStore?.id
+        )
+    }
+
+    /// 判断当前角色是否拥有指定 URI 权限。
+    func canAccess(_ uri: String) -> Bool {
+        permissionURIs.contains(uri.trimmingCharacters(in: .whitespacesAndNewlines))
+    }
+
+    /// 返回当前角色关联的景区作用域。
+    func currentRoleScenicScopes() -> [BusinessScope] {
+        guard let currentRole else { return [] }
+        guard let rolePermission = rolePermissions.first(where: { $0.role.id == currentRole.id }) else {
+            return []
+        }
+        return Self.uniqueScenicScopes(from: rolePermission.scenic)
+    }
+
+    /// 清空权限上下文，通常在退出登录时调用。
+    func reset() {
+        rolePermissions = []
+        permissionURIs = []
+        currentRole = nil
+    }
+
+    /// 递归提取权限树里的非空 URI。
+    private static func flattenPermissions(_ permissions: [PermissionItem]) -> [String] {
+        permissions.flatMap { item -> [String] in
+            let current = item.uri.trimmingCharacters(in: .whitespacesAndNewlines)
+            let children = flattenPermissions(item.children)
+            return current.isEmpty ? children : [current] + children
+        }
+    }
+
+    /// 将角色关联景区去重并转换为业务作用域。
+    private static func uniqueScenicScopes(from scenics: [ScenicInfo]) -> [BusinessScope] {
+        var seen = Set<Int>()
+        return scenics.compactMap { scenic in
+            guard seen.insert(scenic.id).inserted else { return nil }
+            return BusinessScope(id: scenic.id, name: scenic.name, kind: .scenic)
+        }
+    }
+}