//
//  SideMenuController.swift
//  PrivadoVPN
//
//  Created by Murad Shabanov on 14.03.2022.
//  Copyright © 2022 Privado LLC. All rights reserved.
//

import Foundation

protocol SideMenuControllerOutput: AnyObject {
    func sideMenuBottomItem(at index: Int) -> SideMenuItem
    func bottomItemscount() -> Int
    func itemSelectedAt(index: Int)
}

protocol SideMenuControllerInput: AnyObject {
    func reloadBottomItems()
}

final class SideMenuController: NSViewController, SideMenuControllerInput {
    
    enum Constants {
        static let columnIdentifier = NSUserInterfaceItemIdentifier("SideMenuItemList")
        static let cellIdentifier = NSUserInterfaceItemIdentifier("SideMenuItemCell")
        
        enum Image {
            static let privado: String = "sidemenu-privado"
        }
    }
    
    private var privadoLogoView: ImageView
    private let privadoLogoSeparator: View
    private let bottomItemsView: NSTableView
    private let ouput: SideMenuControllerOutput
    
    init(output: SideMenuControllerOutput) {
        self.ouput = output
        self.bottomItemsView = NSTableView()
        self.privadoLogoView = ImageView(frame: .zero)
        self.privadoLogoSeparator = View(frame: .zero)
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func loadView() {
        let view = NSView(frame: .zero)
        view.wantsLayer = true
        view.translatesAutoresizingMaskIntoConstraints = false
        view.layer?.backgroundColor = NSColor(red: 29, green: 33, blue: 91).cgColor
        self.view = view
    }
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.configureUI()
        self.layoutView()
    }
    
    override func viewDidAppear() {
        if let superview = self.view.superview {
            NSLayoutConstraint.activate([
                self.view.leadingAnchor.constraint(equalTo: superview.leadingAnchor),
                self.view.bottomAnchor.constraint(equalTo: superview.bottomAnchor),
                self.view.heightAnchor.constraint(equalToConstant: 550),
                self.view.widthAnchor.constraint(equalToConstant: 60)
            ])
        }
    }
    
    private func configureUI() {
        
        if let logoImage = NSImage(named: Constants.Image.privado) {
            let logoView = ImageView(image: logoImage)
            logoView.translatesAutoresizingMaskIntoConstraints = false
            self.view.addSubview(logoView)
            self.privadoLogoView = logoView
        }
        
        self.privadoLogoSeparator.translatesAutoresizingMaskIntoConstraints = false
        self.privadoLogoSeparator.viewBackgroundColor = NSColor(red: 130, green: 136, blue: 216)
        self.view.addSubview(self.privadoLogoSeparator)
        
        let column = NSTableColumn(identifier: Constants.columnIdentifier)
        column.isEditable = false
        self.bottomItemsView.addTableColumn(column)

        self.bottomItemsView.translatesAutoresizingMaskIntoConstraints = false
        self.bottomItemsView.selectionHighlightStyle = .none
        self.bottomItemsView.backgroundColor = .clear
        self.bottomItemsView.focusRingType = .none
        self.bottomItemsView.rowSizeStyle = .custom
        self.bottomItemsView.cornerView = NSView()
        self.bottomItemsView.allowsMultipleSelection = false
        
        self.bottomItemsView.delegate = self
        self.bottomItemsView.dataSource = self
        
        self.view.addSubview(self.bottomItemsView)
    }
    
    private func layoutView() {
        NSLayoutConstraint.activate([
            self.bottomItemsView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: -15),
            self.bottomItemsView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
            self.bottomItemsView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
            
            self.privadoLogoView.widthAnchor.constraint(equalToConstant: 30),
            self.privadoLogoView.heightAnchor.constraint(equalToConstant: 30),
            self.privadoLogoView.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 20),
            self.privadoLogoView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 15),
            
            self.privadoLogoSeparator.topAnchor.constraint(equalTo: self.privadoLogoView.bottomAnchor, constant: 20),
            self.privadoLogoSeparator.heightAnchor.constraint(equalToConstant: 1),
            self.privadoLogoSeparator.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 10),
            self.privadoLogoSeparator.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -10)
        ])
    }
    
    func reloadBottomItems() {
        self.bottomItemsView.reloadData()
    }
    
}

extension SideMenuController: NSTableViewDelegate {
    
    func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {

        guard tableView.tableColumns[safe: 0] == tableColumn
              , tableColumn.isExist else {
            return nil
        }
        
        tableView.makeView(withIdentifier: Constants.cellIdentifier, owner: nil)
        let item = self.ouput.sideMenuBottomItem(at: row)
        let cell = BottomItemCell(frame: .zero)
        cell.isHoverEnabled = true
        cell.update(with: item.image, lineIsVisible: row != 0, type: item.type)
        return cell
    }
    
    func tableViewSelectionDidChange(_ notification: Notification) {
        let selectedRow = self.bottomItemsView.selectedRow
        self.ouput.itemSelectedAt(index: selectedRow)
        self.bottomItemsView.deselectRow(selectedRow)
    }
    
    func tableView(_ tableView: NSTableView, heightOfRow row: Int) -> CGFloat {
        return 60
    }
}

extension SideMenuController: NSTableViewDataSource {
    func numberOfRows(in tableView: NSTableView) -> Int {
        return self.ouput.bottomItemscount()
    }
}