feat: 添加获客员分成记录并重构列表

suixinkan/Features/CooperationOrder/ViewModels/CommissionRateLogViewModel.swift

@@ -0,0 +1,94 @@
+//
+//  CommissionRateLogViewModel.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 获客员分成比例修改记录 ViewModel，负责刷新、分页与重复项合并。
+final class CommissionRateLogViewModel {
+    private enum Constants {
+        static let pageSize = 10
+    }
+
+    private(set) var items: [CommissionRateLogEntity] = []
+    private(set) var isRefreshing = false
+    private(set) var isLoadingMore = false
+    private(set) var initialLoading = true
+    private(set) var canLoadMore = false
+
+    var onStateChange: (() -> Void)?
+    var onShowMessage: ((String) -> Void)?
+
+    private let saleUserId: Int
+    private var total = 0
+    private var lastLoadedPage = 0
+    private var isLoading = false
+
+    init(saleUserId: Int) {
+        self.saleUserId = saleUserId
+    }
+
+    /// 重新加载第一页修改记录。
+    func refresh(api: OrderAPI) async {
+        await load(api: api, page: 1, append: false)
+    }
+
+    /// 在存在下一页时加载更多修改记录。
+    func loadMore(api: OrderAPI) async {
+        guard canLoadMore, !isRefreshing, !isLoadingMore else { return }
+        await load(api: api, page: lastLoadedPage + 1, append: true)
+    }
+
+    private func load(api: OrderAPI, page: Int, append: Bool) async {
+        guard saleUserId > 0 else {
+            initialLoading = false
+            onShowMessage?("获客员信息无效")
+            notifyStateChange()
+            return
+        }
+        guard !isLoading else { return }
+        isLoading = true
+        if append {
+            isLoadingMore = true
+        } else {
+            isRefreshing = true
+        }
+        notifyStateChange()
+
+        defer {
+            isLoading = false
+            initialLoading = false
+            if append {
+                isLoadingMore = false
+            } else {
+                isRefreshing = false
+            }
+            notifyStateChange()
+        }
+
+        do {
+            let response = try await api.saleUserCommissionRateLogs(
+                saleUserId: saleUserId,
+                page: page,
+                pageSize: Constants.pageSize
+            )
+            if append {
+                let existingIDs = Set(items.map(\.id))
+                items.append(contentsOf: response.list.filter { !existingIDs.contains($0.id) })
+            } else {
+                var seenIDs = Set<Int>()
+                items = response.list.filter { seenIDs.insert($0.id).inserted }
+            }
+            total = max(0, response.total)
+            lastLoadedPage = page
+            canLoadMore = items.count < total && !response.list.isEmpty
+        } catch {
+            onShowMessage?(error.localizedDescription)
+        }
+    }
+
+    private func notifyStateChange() {
+        onStateChange?()
+    }
+}