//
//  ServiceTableViewController.swift
//  I2PLauncher
//
//  Created by Mikal Villa on 20/04/2019.
//  Copyright © 2019 The I2P Project. All rights reserved.
//

import Cocoa
import SnapKit
import MBPopup

class ServiceTableViewController: NSObject, SwitchableTableViewController {
  let contentView = NSStackView(frame: CGRect(x: 0, y: 0, width: 220, height: 400))
  let scrollView = CustomScrollView()
  let tableView = NSTableView()
  let bottomBar = BottomBar()
  let addServicesNoticeField = NSTextField()
  
  var editorTableViewController: EditorTableViewController
  
  var services: [BaseService] = [I2PRouterService(),HttpTunnelService(),IrcTunnelService()] {
    didSet {
      addServicesNoticeField.isHidden = services.count > 0
    }
  }
  
  var servicesBeingUpdated = [BaseService]()
  var generalStatus: ServiceStatus {
    let hasBadServices = services.first { $0.status > .stopped } != nil
    
    return hasBadServices ? .killed : .started
  }
  
  var hidden: Bool = false
  
  var updateCallback: (() -> Void)?
  
  override init() {
    self.editorTableViewController = EditorTableViewController(contentView: contentView, scrollView: scrollView)
    super.init()
  }
  
  func setup() {
    //bottomBar.reloadServicesCallback = (NSApp.delegate as? SwiftApplicationDelegate)!.updateServices
    
    bottomBar.openSettingsCallback = { [weak self] in
      self?.hide()
      self?.editorTableViewController.show()
    }
    
    bottomBar.closeSettingsCallback = { [weak self] in
      self?.editorTableViewController.hide()
      self?.show()
    }
    
    contentView.snp.makeConstraints { make in
      make.left.right.bottom.equalTo(0)
      make.width.greaterThanOrEqualTo(220)
      make.height.greaterThanOrEqualTo(40 + 30 + 2) // tableView.rowHeight + bottomBar.frame.size.height + 2
    }
    
    contentView.addSubview(scrollView)
    contentView.addSubview(bottomBar)
    
    scrollView.snp.makeConstraints { make in
      scrollView.topConstraint = make.top.equalToSuperview().constraint
      make.left.right.equalTo(0)
    }
    
    bottomBar.snp.makeConstraints { make in
      make.width.equalToSuperview()
      make.top.equalTo(scrollView.snp.bottom)
      make.height.equalTo(30)
      make.left.right.equalTo(0)
      make.bottom.equalTo(0)
    }
    
    contentView.addSubview(addServicesNoticeField)
    addServicesNoticeField.snp.makeConstraints { make in
      make.height.equalTo(22)
      make.left.right.equalTo(0)
      make.centerY.equalToSuperview().offset(-14)
    }
    
    scrollView.borderType = .noBorder
    scrollView.hasVerticalScroller = true
    scrollView.hasHorizontalScroller = false
    scrollView.autoresizesSubviews = true
    scrollView.documentView = tableView
    scrollView.drawsBackground = false
    scrollView.wantsLayer = true
    scrollView.layer?.cornerRadius = 6
    
    tableView.frame = scrollView.bounds
    let column = NSTableColumn(identifier: NSUserInterfaceItemIdentifier(rawValue: "serviceColumnIdentifier"))
    column.width = tableView.frame.size.width
    tableView.addTableColumn(column)
    tableView.autoresizesSubviews = true
    tableView.wantsLayer = true
    tableView.layer?.cornerRadius = 6
    tableView.headerView = nil
    tableView.rowHeight = 40
    tableView.gridStyleMask = NSTableView.GridLineStyle.init(rawValue: 0)
    tableView.dataSource = self
    tableView.delegate = self
    tableView.selectionHighlightStyle = .none
    tableView.backgroundColor = NSColor.clear
    
    addServicesNoticeField.isEditable = false
    addServicesNoticeField.isBordered = false
    addServicesNoticeField.isSelectable = false
    
    let italicFont = NSFontManager.shared.font(
      withFamily: NSFont.systemFont(ofSize: 13).fontName,
      traits: NSFontTraitMask.italicFontMask,
      weight: 5,
      size: 13
    )
    
    addServicesNoticeField.font = italicFont
    addServicesNoticeField.textColor = NSColor.textColor
    addServicesNoticeField.maximumNumberOfLines = 1
    addServicesNoticeField.cell!.truncatesLastVisibleLine = true
    addServicesNoticeField.alignment = .center
    addServicesNoticeField.stringValue = "Oh, maybe too empty? :)"
    addServicesNoticeField.backgroundColor = .clear
  }
  
  func willOpenPopup() {
    resizeViews()
    reloadData()
    
    if case let .updated(date) = bottomBar.status {
      if Date().timeIntervalSince1970 - date.timeIntervalSince1970 > 60 {
        //(NSApp.delegate as? SwiftApplicationDelegate)?.updateServices()
      }
    }
  }
  
  func willShow() {
    scrollView.topConstraint?.update(offset: 0)
    scrollView.documentView = tableView
    
    if editorTableViewController.selectionChanged {
      //self.services = ["I2PRouter","HttpTunnel"]//Preferences.shared.selectedServices
      reloadData()
      
      //(NSApp.delegate as? SwiftApplicationDelegate)?.updateServices()
    } else {
      addServicesNoticeField.isHidden = services.count > 0
    }
    
    resizeViews()
  }
  
  func willHide() {
    addServicesNoticeField.isHidden = true
  }
  
  func resizeViews() {
    var frame = scrollView.frame
    frame.size.height = min(tableView.intrinsicContentSize.height, 490)
    scrollView.frame = frame
    
    //(NSApp.delegate as? SwiftApplicationDelegate)?.popupController.resizePopup(height: scrollView.frame.size.height + bottomBar.frame.size.height)
  }
  
  func reloadData(at index: Int? = nil) {
    services.sort()
    
    bottomBar.updateStatusText()
    
    guard index != nil else {
      tableView.reloadData()
      return
    }
    
    tableView.reloadData(forRowIndexes: IndexSet(integer: index!), columnIndexes: IndexSet(integer: 0))
  }
  
  func updateServices(updateCallback: @escaping () -> Void) {
    self.servicesBeingUpdated = [Service]()
    
    guard services.count > 0 else {
      reloadData()
      bottomBar.status = .updated(Date())
      
      self.updateCallback?()
      self.updateCallback = nil
      
      return
    }
    
    self.updateCallback = updateCallback
    let serviceCallback: ((BaseService) -> Void) = { [weak self] service in self?.updatedStatus(for: service) }
    
    bottomBar.status = .updating
    
    services.forEach {
      servicesBeingUpdated.append($0)
      $0.updateStatus(callback: serviceCallback)
    }
  }
  
  func updatedStatus(for service: BaseService) {
    if let index = servicesBeingUpdated.index(of: service) {
      servicesBeingUpdated.remove(at: index)
    }
    
    DispatchQueue.main.async { [weak self] in
      self?.reloadData()
      
      if self?.servicesBeingUpdated.count == 0 {
        self?.bottomBar.status = .updated(Date())
        
        self?.updateCallback?()
        self?.updateCallback = nil
      }
    }
  }
}

extension ServiceTableViewController: NSTableViewDataSource {
  func numberOfRows(in tableView: NSTableView) -> Int {
    return services.count
  }
  
  func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any? {
    return nil
  }
}

extension ServiceTableViewController: NSTableViewDelegate {
  func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
    let identifier = tableColumn?.identifier ?? NSUserInterfaceItemIdentifier(rawValue: "identifier")
    let cell = tableView.makeView(withIdentifier: identifier, owner: self) ?? StatusTableCell()
    
    guard let view = cell as? StatusTableCell else { return nil }
    guard let service = services[row] as? Service else { return nil }
    
    view.textField?.stringValue = service.name
    view.statusField.stringValue = service.message
    view.statusIndicator.status = service.status
    
    return view
  }
  
  func tableView(_ tableView: NSTableView, rowViewForRow row: Int) -> NSTableRowView? {
    let cellIdentifier = NSUserInterfaceItemIdentifier(rawValue: "rowView")
    let cell = tableView.makeView(withIdentifier: cellIdentifier, owner: self) ?? ServiceTableRowView()
    
    guard let view = cell as? ServiceTableRowView else { return nil }
    
    view.showSeparator = row + 1 < services.count
    
    return view
  }
  
  func tableView(_ tableView: NSTableView, shouldSelectRow row: Int) -> Bool {
    guard let _ = services[row] as? Service else { return false }
    
    //NSWorkspace.shared.open(service.url)
    return false
  }
}