//
//  SettingsViewController.swift
//  Delta
//
//  Created by Riley Testut on 9/4/15.
//  Copyright © 2015 Riley Testut. All rights reserved.
//

import UIKit

import DeltaCore

import Roxas

private extension SettingsViewController
{
    enum Section: Int
    {
        case controllers
        case controllerSkins
        case controllerOpacity
        case threeDTouch
    }
    
    enum Segue: String
    {
        case controllers = "controllersSegue"
        case controllerSkins = "controllerSkinsSegue"
    }
    
    enum ControllerSkinsRow: Int
    {
        case snes
        case gba
        case gbc
    }
}

class SettingsViewController: UITableViewController
{
    @IBOutlet private var controllerOpacityLabel: UILabel!
    @IBOutlet private var controllerOpacitySlider: UISlider!
    @IBOutlet private var versionLabel: UILabel!
    
    private var selectionFeedbackGenerator: UISelectionFeedbackGenerator?
    
    private var previousSelectedRowIndexPath: IndexPath?
    
    required init?(coder aDecoder: NSCoder)
    {
        super.init(coder: aDecoder)
        
        NotificationCenter.default.addObserver(self, selector: #selector(SettingsViewController.externalGameControllerDidConnect(_:)), name: .externalGameControllerDidConnect, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(SettingsViewController.externalGameControllerDidDisconnect(_:)), name: .externalGameControllerDidDisconnect, object: nil)
    }
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        self.controllerOpacitySlider.value = Float(Settings.translucentControllerSkinOpacity)
        self.updateControllerOpacityLabel()
        
        if let version = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
        {
            self.versionLabel.text = NSLocalizedString(String(format: "Delta %@", version), comment: "Delta Version")
        }
        else
        {
            self.versionLabel.text = NSLocalizedString("Delta", comment: "")
        }
    }
    
    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated)
        
        if let indexPath = self.previousSelectedRowIndexPath
        {
            if indexPath.section == Section.controllers.rawValue
            {
                // Update and temporarily re-select selected row.
                self.tableView.reloadSections(IndexSet(integer: Section.controllers.rawValue), with: .none)
                self.tableView.selectRow(at: indexPath, animated: false, scrollPosition: UITableViewScrollPosition.none)
            }
            
            self.tableView.deselectRow(at: indexPath, animated: true)
        }
    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?)
    {
        guard
            let identifier = segue.identifier,
            let segueType = Segue(rawValue: identifier),
            let cell = sender as? UITableViewCell,
            let indexPath = self.tableView.indexPath(for: cell)
        else { return }
        
        self.previousSelectedRowIndexPath = indexPath
        
        switch segueType
        {
        case Segue.controllers:
            let controllersSettingsViewController = segue.destination as! ControllersSettingsViewController
            controllersSettingsViewController.playerIndex = indexPath.row
            
        case Segue.controllerSkins:
            let systemControllerSkinsViewController = segue.destination as! SystemControllerSkinsViewController
            
            let row = ControllerSkinsRow(rawValue: indexPath.row)!
            switch row
            {
            case .snes: systemControllerSkinsViewController.system = .snes
            case .gba: systemControllerSkinsViewController.system = .gba
            case .gbc: systemControllerSkinsViewController.system = .gbc
            }            
        }
    }
}

private extension SettingsViewController
{
    func updateControllerOpacityLabel()
    {
        let percentage = String(format: "%.f", Settings.translucentControllerSkinOpacity * 100) + "%"
        self.controllerOpacityLabel.text = percentage
    }
    
    func isSectionHidden(_ section: Section) -> Bool
    {
        switch section
        {
        case .threeDTouch: return self.view.traitCollection.forceTouchCapability != .available
        default: return false
        }
    }
}

private extension SettingsViewController
{
    @IBAction func beginChangingControllerOpacity(with sender: UISlider)
    {
        self.selectionFeedbackGenerator = UISelectionFeedbackGenerator()
        self.selectionFeedbackGenerator?.prepare()
    }
    
    @IBAction func changeControllerOpacity(with sender: UISlider)
    {
        let roundedValue = CGFloat((sender.value / 0.05).rounded() * 0.05)
        
        if roundedValue != Settings.translucentControllerSkinOpacity
        {
            self.selectionFeedbackGenerator?.selectionChanged()
        }
        
        Settings.translucentControllerSkinOpacity = CGFloat(roundedValue)
        
        self.updateControllerOpacityLabel()
    }
    
    @IBAction func didFinishChangingControllerOpacity(with sender: UISlider)
    {
        sender.value = Float(Settings.translucentControllerSkinOpacity)
        self.selectionFeedbackGenerator = nil
    }
}

private extension SettingsViewController
{
    @objc func externalGameControllerDidConnect(_ notification: Notification)
    {
        self.tableView.reloadSections(IndexSet(integer: Section.controllers.rawValue), with: .none)
    }
    
    @objc func externalGameControllerDidDisconnect(_ notification: Notification)
    {
        self.tableView.reloadSections(IndexSet(integer: Section.controllers.rawValue), with: .none)
    }
}

extension SettingsViewController
{
    override func tableView(_ tableView: UITableView, numberOfRowsInSection sectionIndex: Int) -> Int
    {
        let section = Section(rawValue: sectionIndex)!
        switch section
        {
        case .controllers: return 1 // Temporarily hide other controller indexes until controller logic is finalized
        case .controllerSkins: return System.supportedSystems.count
        default:
            if isSectionHidden(section)
            {
                return 0
            }
            else
            {
                return super.tableView(tableView, numberOfRowsInSection: sectionIndex)
            }
        }
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell = super.tableView(tableView, cellForRowAt: indexPath)

        let section = Section(rawValue: indexPath.section)!
        switch section
        {
        case .controllers:
            if indexPath.row == Settings.localControllerPlayerIndex
            {
                cell.detailTextLabel?.text = UIDevice.current.name
            }
            else if let index = ExternalGameControllerManager.shared.connectedControllers.index(where: { $0.playerIndex == indexPath.row })
            {
                let controller = ExternalGameControllerManager.shared.connectedControllers[index]
                cell.detailTextLabel?.text = controller.name
            }
            else
            {
                cell.detailTextLabel?.text = nil
            }
            
        case .controllerSkins: cell.textLabel?.text = System.supportedSystems[indexPath.row].localizedName
        default: break
        }

        return cell
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
    {
        let cell = tableView.cellForRow(at: indexPath)
        let section = Section(rawValue: indexPath.section)!

        switch section
        {
        case Section.controllers: self.performSegue(withIdentifier: Segue.controllers.rawValue, sender: cell)
        case Section.controllerSkins: self.performSegue(withIdentifier: Segue.controllerSkins.rawValue, sender: cell)
        case Section.controllerOpacity: break
        case Section.threeDTouch: break
        }
    }
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String?
    {
        let section = Section(rawValue: section)!
        
        if isSectionHidden(section)
        {
            return nil
        }
        else
        {
            return super.tableView(tableView, titleForHeaderInSection: section.rawValue)
        }
    }
    
    
    override func tableView(_ tableView: UITableView, titleForFooterInSection section: Int) -> String?
    {
        let section = Section(rawValue: section)!
        
        if isSectionHidden(section)
        {
            return nil
        }
        else
        {
            return super.tableView(tableView, titleForFooterInSection: section.rawValue)
        }
    }
    
    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
    {
        let section = Section(rawValue: section)!
        
        if isSectionHidden(section)
        {
            return 1
        }
        else
        {
            return super.tableView(tableView, heightForHeaderInSection: section.rawValue)
        }
    }
    
    override func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat
    {
        let section = Section(rawValue: section)!
        
        if isSectionHidden(section)
        {
            return 1
        }
        else
        {
            return super.tableView(tableView, heightForFooterInSection: section.rawValue)
        }
    }
}