//
//  MainViewController.swift
//  XIONControlPanel
//
//  Created by Charles Magahern on 12/29/15.
//  Copyright © 2015 XION. All rights reserved.
//

import UIKit

class MainViewController: UIViewController, SwitchesViewControllerDelegate, ServerMultiplexDelegate
{
    fileprivate var _serverMultiplex:           ServerMultiplex = ServerMultiplex()
    fileprivate var _visualizationController:   VisualizationViewController = VisualizationViewController()
    fileprivate var _switchesController:        SwitchesViewController = SwitchesViewController()
    fileprivate var _headerView:                HeaderView = HeaderView()
    fileprivate var _updateDevices:             Bool = false
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?)
    {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        
        _serverMultiplex.delegate = self
        _serverMultiplex.addServer(HubitatServer(URL(string: "https://midna.xionsf.com:6000/apps/api/1/")!))
        _serverMultiplex.addServer(WemoServer(URL(string: "http://midna.xionsf.com:5000")!))
    }
    
    required init?(coder aDecoder: NSCoder)
    {
        fatalError("unsupported")
    }
    
    // MARK: Overrides
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        self.view.backgroundColor = UIColor.black
        
        self.addChild(_visualizationController)
        self.view.addSubview(_visualizationController.view)
        
        _switchesController.delegate = self
        self.addChild(_switchesController)
        self.view.addSubview(_switchesController.view)
        
        self.view.addSubview(_headerView)
        
        _updateConnectivityStatus(.disconnected)
    }
    
    override func viewDidLayoutSubviews()
    {
        super.viewDidLayoutSubviews()
        
        let bounds = self.view.bounds
        let headerBounds = CGRect(
            x: 0.0,
            y: 0.0,
            width: bounds.size.width,
            height: rint(bounds.size.height / 8.0)
        )
        let bodyBounds = CGRect(
            x: 0.0,
            y: headerBounds.maxY,
            width: bounds.size.width,
            height: bounds.size.height - headerBounds.size.height
        )
        
        _headerView.frame = headerBounds
        
        let visualizationFrame = CGRect(
            x: bodyBounds.origin.x,
            y: bodyBounds.origin.y,
            width: rint(0.5 * bodyBounds.size.width),
            height: bodyBounds.size.height
        )
        _visualizationController.view.frame = visualizationFrame
        
        var switchesOriginX: CGFloat = 0.0
        var switchesWidth: CGFloat = 0.0
        if (_visualizationShouldBeVisible()) {
            switchesOriginX = visualizationFrame.maxX
            switchesWidth = bodyBounds.size.width - visualizationFrame.size.width
        } else {
            switchesOriginX = 0.0
            switchesWidth = bodyBounds.size.width
        }
        
        let switchesControllerFrame = CGRect(
            x: switchesOriginX,
            y: bodyBounds.origin.y,
            width: switchesWidth,
            height: bodyBounds.size.height
        )
        _switchesController.view.frame = switchesControllerFrame
    }
    
    override func viewDidAppear(_ animated: Bool)
    {
        super.viewDidAppear(animated)
        
        UIApplication.shared.isIdleTimerDisabled = true
        
        _headerView.xionLogoView.beginAnimating()
        
        if _serverMultiplex.devices.count == 0 {
            // Do initial refresh
            _updateConnectivityStatus(.connecting)
            _serverMultiplex.refreshDevices()
            _startUpdatingDevices()
        }
    }
    
    override func viewDidDisappear(_ animated: Bool)
    {
        super.viewDidDisappear(animated)
        UIApplication.shared.isIdleTimerDisabled = false
    }
    
    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)
    {
        super.viewWillTransition(to: size, with: coordinator)
        _updateSizeClassPresentation()
    }
    
    override var prefersStatusBarHidden : Bool
    {
        return true
    }
    
    // MARK: SwitchesViewControllerDelegate
    
    func switchesViewControllerDidToggleDevices(_ controller: SwitchesViewController, devices: [AnyDevice])
    {
        _updateVisualization(true)
        
        for device in devices {
            _serverMultiplex.toggleDeviceState(device, state: device.state, completion: { (error: Error?) -> Void in })
        }
    }
    
    // MARK: Internal
    
    internal func _visualizationShouldBeVisible() -> Bool
    {
        switch self.traitCollection.horizontalSizeClass {
        case .regular:
            return true
            
        case .compact:
            return false
            
        default:
            return false
        }
    }
    
    internal func _updateSizeClassPresentation()
    {
        _visualizationController.view.isHidden = !_visualizationShouldBeVisible()
    }
    
    internal func _updateVisualization(_ animated: Bool)
    {
        let activatedDevicesCount = _serverMultiplex.devices.filter { $0.state == .on }.count
        let totalDeviceCount = _serverMultiplex.devices.count
        
        let percentageActivated = (totalDeviceCount > 0 ? Float(activatedDevicesCount) / Float(totalDeviceCount) : 0.0)
        if (percentageActivated != _visualizationController.percentActivated) {
            _visualizationController.setPercentActivated(percentageActivated, animated: animated)
        }
    }
    
    internal func _updateConnectivityStatus(_ status: ConnectionStatus)
    {
        DispatchQueue.main.async { () -> Void in
            self._headerView.connectionStatusView.connectivityStatus = status
            self._headerView.setNeedsLayout()
            self._visualizationController.connectionStatus = status
        }
    }
    
    internal func _startUpdatingDevices()
    {
        _updateDevices = true
        
        let interval = DispatchTime.now() + Double(Int64(10 * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
        DispatchQueue.main.asyncAfter(deadline: interval) { () -> Void in
            if (self._updateDevices) {
                self._serverMultiplex.refreshDevices()
                self._startUpdatingDevices()
            }
        }
    }
    
    internal func _stopUpdatingDevices()
    {
        _updateDevices = false
    }
    
    // MARK: Server Multiplex Delegate
    
    func serverMultiplex(_ multiplex: ServerMultiplex, didAddDevices devices: [AnyDevice])
    {
        _switchesController.devices = Array(multiplex.devices)
        _updateVisualization(false)
    }
    
    func serverMultiplex(_ multiplex: ServerMultiplex, devicesStateChanged devices: [AnyDevice])
    {
        _switchesController.devicesStateChanged(devices)
    }
    
    func serverMultiplex(_ multiplex: ServerMultiplex, didReceiveAcknowledgementFromServer server: Server)
    {
        // Update connection status too, if applicable
        let groupConnectionStatus = multiplex.groupConnectionStatus()
        _updateConnectivityStatus(groupConnectionStatus)
    }
    
    func serverMultiplex(_ multiplex: ServerMultiplex, didEncounterError error: Error)
    {
        _updateConnectivityStatus(.error)
        
        var stderr = StandardErrorOutputStream()
        print(error.localizedDescription, to: &stderr)
    }
}