//
//  KMPreferenceSegementControl.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/2/3.
//

import Cocoa

typealias KMPreferenceSegementItemClick = (_ index: Int) -> ()
class KMPreferenceSegementItem: NSView {
    var imageView = NSImageView()
    var label = NSTextField(labelWithString: "")
    
    var itemID: Int = 0
    
    var itemClick: KMPreferenceSegementItemClick?
    
    var selectedImage: NSImage?
    var unSelectedImage: NSImage?
    var selectedTextColor: NSColor?
    var unSelectedTextColor: NSColor?
    
    private var mySelected: Bool = false
    var isSelected: Bool {
        get {
            return self.mySelected
        }
        set {
            self.mySelected = newValue
            
            if (newValue) {
                self.layer?.backgroundColor = NSColor(white: 0, alpha: 0.05).cgColor
                
                self.imageView.image = self.selectedImage
                self.label.textColor = self.selectedTextColor
            } else {
                self.layer?.backgroundColor = NSColor.clear.cgColor
                
                self.imageView.image = self.unSelectedImage
                self.label.textColor = self.unSelectedTextColor
            }
        }
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        initSubViews()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        initSubViews()
    }
    
    override var isFlipped: Bool {
        return true
    }
    
    public func initSubViews() {
        self.addSubview(self.imageView)
        self.addSubview(self.label)
        self.label.alignment = .center
        
        self.wantsLayer = true
        self.layer?.cornerRadius = 7
        
        /// 新增点击手势
        let gesture = NSClickGestureRecognizer(target: self, action: #selector(gestureAction))
        self.addGestureRecognizer(gesture)
    }
    
    override func layout() {
        super.layout()
        
        let width: CGFloat = NSWidth(self.bounds)
        
        let size: CGFloat = 17
        self.imageView.frame = NSMakeRect((width-size)*0.5, 6, size, size)
        
        self.label.frame = NSMakeRect(0, self.imageView.frame.maxY+5, width, 14)
    }
    
    @objc private func gestureAction() {
        guard let callback = self.itemClick else {
            return
        }
        
        callback(self.itemID)
    }
}

class KMPreferenceSegementControl: NSControl {
    
    var items: Array<KMPreferenceSegementItem> = []
    var selectedIndex: Int = 0
    var selectedItem: KMPreferenceSegementItem?
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        initSubViews()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        initSubViews()
    }
    
    override var isFlipped: Bool {
        return true
    }
    
    func initSubViews() {
        for item in self.items {
            item.removeFromSuperview()
        }
        self.items.removeAll()
        
        for i in 0 ... 2 {
            let item = KMPreferenceSegementItem()
            item.itemID = i + 1
            self.addSubview(item)
            self.items.append(item)
            
            item.itemClick = { [weak self] index in
                self?.selectItem(index)
                
                let _ = self?.target?.perform(self?.action, with: self)
            }
        }
    }
    
    override func layout() {
        super.layout()
        
        let width: CGFloat = NSWidth(self.bounds)
        
        let itemSize: NSSize = NSSize(width: 75, height: 45)
        let leftMargin: CGFloat = (width-CGFloat(self.items.count)*itemSize.width)*0.5
        let topMargin: CGFloat = 8
        var preItem: KMPreferenceSegementItem?
        for item in self.items {
            if (preItem != nil) {
                item.frame = NSMakeRect((preItem?.frame.maxX)!, topMargin, itemSize.width, itemSize.height)
            } else {
                item.frame = NSMakeRect(leftMargin, topMargin, itemSize.width, itemSize.height)
            }
            preItem = item
        }
    }
    
    public func selectItem(_ index: Int) {
        self.selectedIndex = index
        for item in items {
            if (item.itemID == index) {
                item.isSelected = true
                self.selectedItem = item
            } else {
                item.isSelected = false
            }
        }
    }
}