实现权限驱动的首页 Tab 并对齐 Android

suixinkan/Features/Home/Services/HomeLocationStateStore.swift

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+//
+//  HomeLocationStateStore.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 首页在线状态与 2 小时倒计时存储，对齐 Android `LocationStateRepository`。
+final class HomeLocationStateStore {
+
+    static let onlineDurationMillis: Int64 = 2 * 60 * 60 * 1000
+
+    private(set) var isOnline = false
+    private(set) var elapsedSeconds: Int64 = 0
+    private(set) var nextReportCountdownSeconds: Int64 = 0
+    private(set) var reminderMinutes = 0
+
+    var onStateChange: (() -> Void)?
+
+    private let store: AppStore
+    private var countdownTask: Task<Void, Never>?
+    private var anchorTimestamp: Int64?
+
+    init(store: AppStore = .shared) {
+        self.store = store
+        reminderMinutes = store.locationReminderMinutes
+        isOnline = store.onlineStatus
+    }
+
+    /// 启动时恢复在线倒计时。
+    func restoreStateIfNeeded() {
+        guard store.onlineStatus else { return }
+        let lastTime = store.lastLocationReportTime
+        guard lastTime > 0 else { return }
+
+        let now = Int64(Date().timeIntervalSince1970 * 1000)
+        let elapsed = now - lastTime
+        if elapsed >= Self.onlineDurationMillis {
+            updateOnlineStatus(false)
+            store.clearLastLocationReportTime()
+            notifyChange()
+            return
+        }
+
+        anchorTimestamp = lastTime
+        let remaining = Self.onlineDurationMillis - elapsed
+        elapsedSeconds = max(0, elapsed / 1000)
+        nextReportCountdownSeconds = max(0, remaining / 1000)
+        startCountdown(anchorTime: lastTime)
+        notifyChange()
+    }
+
+    /// 更新在线状态并持久化。
+    func updateOnlineStatus(_ online: Bool) {
+        isOnline = online
+        store.onlineStatus = online
+        if !online {
+            stopCountdown()
+            store.clearLastLocationReportTime()
+        }
+        notifyChange()
+    }
+
+    /// 更新提醒分钟数。
+    func updateReminderMinutes(_ minutes: Int) {
+        reminderMinutes = minutes
+        store.locationReminderMinutes = minutes
+        notifyChange()
+    }
+
+    /// 开始新的位置上报会话。
+    func startLocationReport(at timestamp: Int64 = Int64(Date().timeIntervalSince1970 * 1000)) {
+        anchorTimestamp = timestamp
+        store.lastLocationReportTime = timestamp
+        isOnline = true
+        store.onlineStatus = true
+        elapsedSeconds = 0
+        nextReportCountdownSeconds = Self.onlineDurationMillis / 1000
+        startCountdown(anchorTime: timestamp)
+        notifyChange()
+    }
+
+    /// 格式化倒计时文本 `HH:MM:SS`。
+    func formattedCountdown(from seconds: Int64) -> String {
+        let hours = seconds / 3600
+        let minutes = (seconds % 3600) / 60
+        let secs = seconds % 60
+        return String(format: "%02d:%02d:%02d", hours, minutes, secs)
+    }
+
+    var countdownDisplayText: String {
+        formattedCountdown(from: nextReportCountdownSeconds)
+    }
+
+    /// 是否到达提前提醒窗口。
+    func shouldTriggerTimeoutReminder() -> Bool {
+        guard reminderMinutes > 0, isOnline else { return false }
+        let reminderSeconds = Int64(reminderMinutes * 60)
+        return nextReportCountdownSeconds > 0 && nextReportCountdownSeconds <= reminderSeconds
+    }
+
+    private func startCountdown(anchorTime: Int64) {
+        countdownTask?.cancel()
+        countdownTask = Task { [weak self] in
+            while !Task.isCancelled {
+                guard let self else { return }
+                guard self.isOnline else { return }
+
+                let now = Int64(Date().timeIntervalSince1970 * 1000)
+                let elapsed = now - anchorTime
+                let remaining = Self.onlineDurationMillis - elapsed
+                let elapsedSeconds = max(0, elapsed / 1000)
+
+                self.elapsedSeconds = elapsedSeconds
+                if remaining <= 0 {
+                    self.nextReportCountdownSeconds = 0
+                    self.updateOnlineStatus(false)
+                    self.store.clearLastLocationReportTime()
+                    return
+                }
+                self.nextReportCountdownSeconds = max(0, remaining / 1000)
+                self.notifyChange()
+                try? await Task.sleep(nanoseconds: 1_000_000_000)
+            }
+        }
+    }
+
+    private func stopCountdown() {
+        countdownTask?.cancel()
+        countdownTask = nil
+        anchorTimestamp = nil
+        elapsedSeconds = 0
+        nextReportCountdownSeconds = 0
+    }
+
+    private func notifyChange() {
+        onStateChange?()
+    }
+}