//
//  KMLanguageViewController.swift
//  PDF Reader Pro
//
//  Created by liujiajie on 2023/11/16.
//

import Cocoa

@objc(KMLanguageTableCellViewDelegate)
protocol KMLanguageTableCellViewDelegate: AnyObject {
    @objc optional func tableCellViewCheckButtonDidChange(_ cell: KMLanguageTableCellView)
}

class KMLanguageTableCellView: NSTableCellView{
    var delegate: KMLanguageTableCellViewDelegate?
    var language: [String: String] = [:]
    @IBOutlet var checkButton: NSButton!

    @IBAction func checkButtonAction(_ sender: NSButton) {
        self.delegate?.tableCellViewCheckButtonDidChange?(self)
    }
}

class KMLanguageViewController: NSViewController,KMLanguageTableCellViewDelegate,NSOutlineViewDelegate,NSOutlineViewDataSource,NSTokenFieldDelegate{
    @IBOutlet var tokenField: NSTokenField!
    @IBOutlet var outlineView: NSOutlineView!

    var languages: NSArray?
    lazy var selectedLanguages: NSMutableArray = {
        if KMGOCRManager.default().selectedLanguages == nil {
            KMGOCRManager.default().selectedLanguages = NSMutableArray()
        }
        return KMGOCRManager.default().selectedLanguages!
    }()

    var builtInKeywords: Array<Any>?
    
    override init(nibName nibNameOrNil: NSNib.Name?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        self.languages = KMGOCRManager.languages() as NSArray
        self.outlineView.reloadData()
        self.builtInKeywords = self.languages?.value(forKeyPath: KMGOCRLanguageStringKey) as? [String]
        self.tokenField.cell?.lineBreakMode = .byTruncatingTail
        self.updateTokenField()
    }
    func updateTokenField() {
        self.tokenField.objectValue = self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey)
        // commit the edit change
        let fieldEditor = self.tokenField.currentEditor()
        fieldEditor?.selectedRange = NSRange(location: fieldEditor?.string.count ?? 0, length: 0)
    }
    func outlineView(_ outlineView: NSOutlineView, numberOfChildrenOfItem item: Any?) -> Int {
        return self.languages?.count ?? 0
    }
    func outlineView(_ outlineView: NSOutlineView, child index: Int, ofItem item: Any?) -> Any {
        return self.languages?[index] as Any
    }
    func outlineView(_ outlineView: NSOutlineView, isItemExpandable item: Any) -> Bool {
        return false
    }
    func outlineView(_ outlineView: NSOutlineView, viewFor tableColumn: NSTableColumn?, item: Any) -> NSView? { 
        if let itemDictionary = item as? NSDictionary {
            let result = outlineView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "DataCell"), owner: self) as? KMLanguageTableCellView
            result?.textField?.stringValue = itemDictionary[KMGOCRLanguageStringKey] as? String ?? ""
            result?.checkButton.state =  self.selectedLanguages.contains(itemDictionary) ? .on : .off
            result?.language = itemDictionary as! [String : String]
            result?.delegate = self
            return result
        }
        return nil
    }
    func outlineView(_ outlineView: NSOutlineView, shouldSelectItem item: Any) -> Bool { 
        return false
    }
    func tableCellViewCheckButtonDidChange(_ cell: KMLanguageTableCellView) {
        if cell.checkButton.state == .on {
            if !self.selectedLanguages.contains(cell.language) {
                self.selectedLanguages.add(cell.language)
            }
        } else {
            if self.selectedLanguages.contains(cell.language) {
                self.selectedLanguages.remove(cell.language)
            }
        }
        self.updateTokenField()
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "KMOCRSelectedLanguagesChangeNotification"), object: self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey))
    }
    //MARK: NSTokenFieldDelegate
    func tokenField(_ tokenField: NSTokenField, shouldAdd tokens: [Any], at index: Int) -> [Any] {
        let newTokens = NSMutableArray()
        for string in tokens {
            let arr: NSArray = self.builtInKeywords! as NSArray
            if arr.contains(string) {
                newTokens.add(string as! String)
            } else {
                continue
            }
            let ar: NSArray = self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey) as! NSArray
            if !ar.contains(string) {
                let index = (self.languages?.value(forKeyPath: KMGOCRLanguageStringKey) as AnyObject).index(of: string)
                
                if let OCRLanguage = self.languages?[index] as? NSDictionary {
                    self.selectedLanguages.add(OCRLanguage)
                }
            }
        }
        self.outlineView.reloadData()
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "KMOCRSelectedLanguagesChangeNotification"), object: self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey))
        return newTokens as! [String]
    }
    func tokenField(_ tokenField: NSTokenField, completionsForSubstring substring: String, indexOfToken tokenIndex: Int, indexOfSelectedItem selectedIndex: UnsafeMutablePointer<Int>?) -> [Any]? {
        let arrayFilter = self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey) as? NSArray
//        let str = String(format: "NOT (SELF in %@)", arrayFilter ?? "{}")
        let thePredicate = NSPredicate(format: "NOT (SELF in %@)", arrayFilter ?? [])
        let arr: NSArray = self.builtInKeywords! as NSArray
        
        let newBuiltInKeywords: NSArray = arr.filtered(using: thePredicate) as NSArray
//        let str1 = String(format: "SELF beginswith[cd] %@", substring)
        let matches = newBuiltInKeywords.filtered(using: NSPredicate(format: "SELF beginswith[cd] %@", substring))
        return matches
    }
    
    func controlTextDidEndEditing(_ obj: Notification) {
        let array: NSArray = self.tokenField.objectValue as! NSArray
        let string = array.lastObject
        let newArray = NSMutableArray.init(array: array)
        let arr: NSArray = self.builtInKeywords! as NSArray
        if !arr.contains(string ?? "") {
            newArray.remove(string ?? "")
        }
        
        self.tokenField.objectValue = newArray
        
        self.selectedLanguages.removeAllObjects()
       
        for string in self.tokenField.objectValue as? [String] ?? [] {
            if !(self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey) as? [String] ?? []).contains(string) {
                let index = (self.languages?.value(forKeyPath: KMGOCRLanguageStringKey) as AnyObject).index(of: string)
                if let OCRLanguage = self.languages?[index] as? NSDictionary {
                    self.selectedLanguages.add(OCRLanguage)
                }
            }
        }
        
        self.outlineView.reloadData()
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "KMOCRSelectedLanguagesChangeNotification"),
                                        object: self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey))
    }
    func controlTextDidChange(_ obj: Notification) {
        if selectedLanguages.count > (self.tokenField.objectValue as? [Any] ?? []).count {
            self.selectedLanguages.removeAllObjects()
            for string in self.tokenField.objectValue as? [String] ?? [] {
                if !(self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey) as? [String] ?? []).contains(string) {
                    let index = (self.languages?.value(forKeyPath: KMGOCRLanguageStringKey) as AnyObject).index(of: string)
                    if let OCRLanguage = self.languages?[index] as? NSDictionary {
                        self.selectedLanguages.add(OCRLanguage)
                    }
                }
            }
            self.outlineView.reloadData()
            
            NotificationCenter.default.post(name: NSNotification.Name(rawValue: "KMOCRSelectedLanguagesChangeNotification"),
                                            object: self.selectedLanguages.value(forKeyPath: KMGOCRLanguageStringKey))
        }
    }
}