//
//  KMWatermarkAdjectiveSegementControl.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2022/12/16.
//

import Cocoa

class KMWatermarkAdjectiveSegementItemControl: NSControl {
    lazy var button: NSButton = {
        let button = NSButton()
        button.isBordered = false
        button.font = NSFont.systemFont(ofSize: 14)
        button.target = self
        button.action = #selector(buttonClick)
        return button
    }()
    
    private lazy var bottomLine: NSView = {
        let line = NSView()
        line.wantsLayer = true
        line.layer?.backgroundColor = NSColor.black.cgColor
        return line
    }()
    
    private var mySelected: Bool!
    var selected: Bool {
        get {
            return mySelected
        }
        set {
            mySelected = newValue
            
            if (newValue) {
                self.bottomLine.isHidden = false
                self.button.attributedTitle = NSAttributedString(string: self.button.title, attributes: [NSAttributedString.Key.foregroundColor : NSColor.black, NSAttributedString.Key.font : NSFont.systemFont(ofSize: 14)])
            } else {
                self.bottomLine.isHidden = true
                self.button.attributedTitle = NSAttributedString(string: self.button.title, attributes: [NSAttributedString.Key.foregroundColor : NSColor(white: 102.0/255.0, alpha: 1.0), NSAttributedString.Key.font : NSFont.systemFont(ofSize: 14)])
            }
        }
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        self.initSubViews()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        self.initSubViews()
    }
    
    func initSubViews() {
        self.addSubview(self.button)
        self.addSubview(self.bottomLine)
    }
    
    override func layout() {
        super.layout()
        
        button.frame = self.bounds
        bottomLine.frame = NSMakeRect(0, 0, NSWidth(self.bounds), 1)
    }
    
    @objc func buttonClick() {
        if ((self.target?.responds(to: self.action))!) {
            self.target?.perform(self.action, with: self)
        }
    }
}

typealias KMWatermarkAdjectiveSegementControlItemClick = (_ index: Int) -> ()
class KMWatermarkAdjectiveSegementControl: NSView {
    
    private var itemControls: Array<KMWatermarkAdjectiveSegementItemControl> = []
    
    private var myItems: Array<String>!
    var items: Array<String> {
        get {
            return myItems
        }
        set {
            myItems = newValue
            
            /// 清理数据
            for itemControl in self.itemControls {
                itemControl.removeFromSuperview()
            }
            self.itemControls.removeAll()
            
            /// 添加数据
            for titleValue in newValue {
                let itemControl = KMWatermarkAdjectiveSegementItemControl()
                itemControl.button.title = titleValue
                itemControl.target = self
                itemControl.action = #selector(itemControlDidSelected)
                self.addSubview(itemControl)
                self.itemControls.append(itemControl)
            }
            
            self.selectItemIndex = mySelectItemIndex
            
            self.layoutSubtreeIfNeeded()
        }
    }
    
    private var mySelectItemIndex: Int = 0
    var selectItemIndex: Int {
        get {
            return mySelectItemIndex
        }
        set {
            mySelectItemIndex = newValue
            
            var i: Int = 0
            for itemControl in itemControls {
                if (i == newValue) {
                    itemControl.selected = true
                } else {
                    itemControl.selected = false
                }
                i += 1
            }
        }
    }
    
    var itemClick: KMWatermarkAdjectiveSegementControlItemClick!
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    override func layout() {
        super.layout()
        
        let width: CGFloat = NSWidth(self.bounds)
        let height: CGFloat = NSHeight(self.bounds)
        
        var i: Int = 0
        var itemW: CGFloat = width * 0.5
        if (self.itemControls.count > 0) {
            itemW = width / CGFloat(self.itemControls.count)
        }
        
        for itemControl in self.itemControls {
            itemControl.frame = NSMakeRect(CGFloat(i) * itemW, 0, itemW, height)
            i += 1
        }
    }
    
    @objc func itemControlDidSelected(sender: KMWatermarkAdjectiveSegementItemControl) {
        var index: Int = 0
        for itemControl in itemControls {
            if (itemControl.isEqual(to: sender)) {
                break
            }
            index += 1
        }
        
        self.selectItemIndex = index;
        
        guard let callback = itemClick else {
            return
        }
        
        callback(self.selectItemIndex)
    }
}