//
//  reader.swift
//  Remote
//
//  Created by Serhiy Mytrovtsiy on 20/05/2026.
//  Using Swift 6.0.
//  Running on macOS 26.5.
//
//  Copyright © 2020 Serhiy Mytrovtsiy. All rights reserved.
//

import Kit

public final class DataReader: Reader<RemoteSnapshot> {
    private var task: Task<Void, Never>?
    private let taskLock = NSLock()
    
    public override func setup() {
        self.interval = 60
    }
    
    public override func read() {
        guard SystemStats.shared.isAuthorized else {
            self.callback(nil)
            return
        }
        
        self.taskLock.lock()
        self.task?.cancel()
        self.task = Task { [weak self] in
            async let machines = SystemStats.shared.fetchMachines()
            async let hosts = SystemStats.shared.fetchHosts()
            async let groups = SystemStats.shared.fetchGroups()
            async let order = SystemStats.shared.fetchAccountOrder()
            
            let (m, h, g, o) = await (machines, hosts, groups, order)
            guard !Task.isCancelled else { return }
            
            self?.callback(RemoteSnapshot(machines: m, hosts: h, groups: g, order: o))
        }
        self.taskLock.unlock()
    }
}