//
//  KMToolbarPreviousNextItemView.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/12/15.
//

import Cocoa

private func _KMPreviousNextString() -> String {
    return "\(NSLocalizedString("Previous", comment: ""))/\(NSLocalizedString("Next", comment: ""))"
}

private let _minWidth: CGFloat = 24 * 2

class KMToolbarPreviousNextItemView: NSView {
    
    var callback: KMCommonClickBlock?
    
    lazy var previousButton: KMCoverButton = {
        let button = KMCoverButton()
        button.wantsLayer = true
        button.isBordered = false
        button.layer?.cornerRadius = 6
        button.image = NSImage(named: "KMImageNameToolbarPagepreviousNor")
        button.toolTip = NSLocalizedString("Go To Previous Page", comment: "")
        button.imagePosition = .imageOnly
        button.target = self
        button.action = #selector(buttonClicked)
        button.coverAction = { cbtn, caction in
            if caction == .enter {
                cbtn.layer?.backgroundColor = KMToolbarItemView.selectedBackgroundColor.cgColor
            } else if caction == .exit {
                cbtn.layer?.backgroundColor = KMToolbarItemView.normalBackgroundColor.cgColor
            }
        }
        return button
    }()
    
    lazy var nextButton: KMCoverButton = {
        let button = KMCoverButton()
        button.wantsLayer = true
        button.isBordered = false
        button.layer?.cornerRadius = 6
        button.image = NSImage(named: "KMImageNameToolbarPagenextNor")
        button.toolTip = NSLocalizedString("Go To Next Page", comment: "")
        button.imagePosition = .imageOnly
        button.target = self
        button.action = #selector(buttonClicked)
        
        button.coverAction = { cbtn, caction in
            if caction == .enter {
                cbtn.layer?.backgroundColor = KMToolbarItemView.selectedBackgroundColor.cgColor
            } else if caction == .exit {
                cbtn.layer?.backgroundColor = KMToolbarItemView.normalBackgroundColor.cgColor
            }
        }
        
        return button
    }()
    
    lazy var titleLabel: NSTextField = {
        let label = NSTextField(labelWithString: _KMPreviousNextString())
        label.font = KMToolbarMainItemView.textFont
        label.textColor = KMToolbarMainItemView.fetchTextNormalColor()
        return label
    }()
    
    convenience init() {
        self.init(frame: NSMakeRect(0, 0, Self.itemWidth, 40))
    }

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        self.initSubview()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        self.initSubview()
    }
    
    func initSubview() {
        self.addSubview(self.previousButton)
        self.addSubview(self.nextButton)
        self.addSubview(self.titleLabel)
        
        self.previousButton.km_add_left_constraint()
        self.previousButton.km_add_right_constraint(equalTo: self.nextButton, attribute: .left)
        self.previousButton.km_add_top_constraint()
        self.previousButton.km_add_height_constraint(constant: 24)
        
        self.nextButton.km_add_right_constraint()
        self.nextButton.km_add_width_constraint(equalTo: self.previousButton, attribute: .width)
        self.nextButton.km_add_top_constraint()
        self.nextButton.km_add_height_constraint(constant: 24)
        
        
        self.titleLabel.km_add_bottom_constraint()
        self.titleLabel.km_add_height_constraint(constant: 14)
        self.titleLabel.km_add_left_constraint()
        self.titleLabel.km_add_right_constraint()
        self.titleLabel.km_add_width_constraint(constant: Self.itemWidth)
//        self.titleLabel.km_add_top_constraint(equalTo: self.previousButton, attribute: .bottom)
    }
    
    class var itemWidth: CGFloat {
        get {
            let string = _KMPreviousNextString()
            let width = string.boundingRect(with: NSSize(width: CGFLOAT_MAX, height: 20), options: [.usesLineFragmentOrigin, .truncatesLastVisibleLine], attributes: [.font : KMToolbarMainItemView.textFont]).size.width + 5 * 2
            if width < _minWidth {
                return _minWidth
            }
            return width
        }
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        // Drawing code here.
    }
    
    @objc func buttonClicked(_ sender: NSButton) {
        guard let block = self.callback else {
            return
        }
        if self.previousButton.isEqual(to: sender) {
            block(1)
        } else if self.nextButton.isEqual(to: sender) {
            block(2)
        }
    }
}