//
//  EditorTableViewController.swift
//  I2PLauncher
//
//  Created by Mikal Villa on 08/04/2019.
//  Copyright © 2019 The I2P Project. All rights reserved.
//

import Cocoa
import SnapKit

class EditorTableViewController: NSObject, SwitchableTableViewController {
  let contentView: NSStackView
  let scrollView: CustomScrollView
  let tableView = NSTableView()
  
  let allServices: [BaseService] = BaseService.all().sorted()
  var filteredServices: [BaseService]
  var selectedServices: [BaseService] = []//Preferences.shared().selectedServices
  
  var selectionChanged = false
  
  let settingsView = SettingsView()
  
  var hidden: Bool = true
  
  init(contentView: NSStackView, scrollView: CustomScrollView) {
    self.contentView = contentView
    self.scrollView = scrollView
    self.filteredServices = allServices
    
    print(allServices)
    
    super.init()
    setup()
  }
  
  func setup() {
    tableView.frame = scrollView.bounds
    let column = NSTableColumn(identifier: NSUserInterfaceItemIdentifier(rawValue: "editorColumnIdentifier"))
    column.width = 200
    tableView.addTableColumn(column)
    tableView.autoresizesSubviews = true
    tableView.wantsLayer = true
    tableView.layer?.cornerRadius = 6
    tableView.headerView = nil
    tableView.rowHeight = 30
    tableView.gridStyleMask = NSTableView.GridLineStyle.init(rawValue: 0)
    tableView.dataSource = self
    tableView.delegate = self
    tableView.selectionHighlightStyle = .none
    tableView.backgroundColor = NSColor.clear
    
    settingsView.isHidden = true
    settingsView.searchCallback = { [weak self] searchString in
      guard
        let strongSelf = self,
        let allServices = strongSelf.allServices as? [Service]
        else { return }
      
      if searchString.trimmingCharacters(in: .whitespacesAndNewlines) == "" {
        strongSelf.filteredServices = allServices
      } else {
        // Can't filter array with NSPredicate without making Service inherit KVO from NSObject, therefore we create
        // an array of service names that we can run the predicate on
        let allServiceNames = allServices.compactMap { $0.name } as NSArray
        let predicate = NSPredicate(format: "SELF LIKE[cd] %@", argumentArray: ["*\(searchString)*"])
        guard let filteredServiceNames = allServiceNames.filtered(using: predicate) as? [String] else { return }
        
        strongSelf.filteredServices = allServices.filter { filteredServiceNames.contains($0.name) }
      }
      
      strongSelf.tableView.reloadData()
    }
    
    contentView.addSubview(settingsView)
    settingsView.snp.makeConstraints { make in
      make.top.left.right.equalTo(0)
      make.height.equalTo(130)
    }
  }
  
  func willShow() {
    self.selectionChanged = false
    
    scrollView.topConstraint?.update(offset: settingsView.frame.size.height)
    scrollView.documentView = tableView
    
    settingsView.isHidden = false
    
    // We should be using NSWindow's makeFirstResponder: instead of the search field's selectText:, but in this case, makeFirstResponder
    // is causing a bug where the search field "gets focused" twice (focus ring animation) the first time it's drawn.
    settingsView.searchField.selectText(nil)
    
    resizeViews()
  }
  
  func resizeViews() {
    tableView.frame = scrollView.bounds
    tableView.tableColumns.first?.width = tableView.frame.size.width
    
    scrollView.frame.size.height = 400
    
    (NSApp.delegate as? SwiftApplicationDelegate)?.popupController.resizePopup(
      height: scrollView.frame.size.height + 30 // bottomBar.frame.size.height
    )
  }
  
  func willOpenPopup() {
    resizeViews()
  }
  
  func didOpenPopup() {
    settingsView.searchField.window?.makeFirstResponder(settingsView.searchField)
  }
  
  func willHide() {
    settingsView.isHidden = true
  }
}

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

extension EditorTableViewController: 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) ?? EditorTableCell()
    
    guard let view = cell as? EditorTableCell else { return nil }
    guard let service = filteredServices[row] as? Service else { return nil }
    
    view.textField?.stringValue = service.name
    view.selected = selectedServices.contains(service)
    view.toggleCallback = { [weak self] in
      guard let strongSelf = self else { return }
      
      strongSelf.selectionChanged = true
      
      if view.selected {
        self?.selectedServices.append(service)
      } else {
        if let index = self?.selectedServices.index(of: service) {
          self?.selectedServices.remove(at: index)
        }
      }
      
      //Preferences.shared().selectedServices = strongSelf.selectedServices
    }
    
    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 < filteredServices.count
    
    return view
  }
}