新增景区排队管理功能

suixinkan/Features/ScenicQueue/ViewModels/ScenicQueueSettingChangeLogViewModel.swift

@@ -0,0 +1,81 @@
+//
+//  ScenicQueueSettingChangeLogViewModel.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 排队设置配置日志 ViewModel。
+final class ScenicQueueSettingChangeLogViewModel {
+    private enum Constants {
+        static let pageSize = 20
+    }
+
+    private(set) var items: [ScenicQueueSettingChangeLogItem] = []
+    private(set) var isRefreshing = false
+    private(set) var isLoadingMore = false
+    private(set) var canLoadMore = false
+
+    var onStateChange: (() -> Void)?
+    var onShowMessage: ((String) -> Void)?
+
+    private let appStore: AppStore
+    private var total = 0
+    private var lastLoadedPage = 0
+
+    init(appStore: AppStore = .shared) {
+        self.appStore = appStore
+    }
+
+    /// 刷新配置日志。
+    func refresh(api: ScenicQueueAPIProtocol) async {
+        await load(api: api, page: 1, append: false)
+    }
+
+    /// 加载更多配置日志。
+    func loadMore(api: ScenicQueueAPIProtocol) async {
+        guard canLoadMore, !isRefreshing, !isLoadingMore else { return }
+        await load(api: api, page: lastLoadedPage + 1, append: true)
+    }
+
+    private func load(api: ScenicQueueAPIProtocol, page: Int, append: Bool) async {
+        guard appStore.currentScenicId > 0 else {
+            onShowMessage?("请先选择景区")
+            return
+        }
+        if append {
+            isLoadingMore = true
+        } else {
+            isRefreshing = true
+        }
+        notifyStateChange()
+        defer {
+            if append { isLoadingMore = false } else { isRefreshing = false }
+            notifyStateChange()
+        }
+        let spotId = Int64(appStore.scenicQueuePunchSpotId)
+        do {
+            let data = try await api.settingChangeLog(
+                scenicId: Int64(appStore.currentScenicId),
+                scenicSpotId: spotId,
+                page: page,
+                pageSize: Constants.pageSize
+            )
+            if append {
+                let seen = Set(items.map(\.id))
+                items += data.list.filter { !seen.contains($0.id) }
+            } else {
+                items = data.list
+            }
+            total = max(0, data.total)
+            lastLoadedPage = max(1, data.page)
+            canLoadMore = items.count < total && !data.list.isEmpty
+        } catch {
+            onShowMessage?(error.localizedDescription)
+        }
+    }
+
+    private func notifyStateChange() {
+        onStateChange?()
+    }
+}