//
//  KMNPreView.swift
//  PDF Reader Pro
//
//  Created by User-Tangchao on 2024/10/25.
//

import Cocoa
import KMComponentLibrary

class KMNPreView: NSView, NibLoadable {
    @IBOutlet weak var pdfPreView: KMNPDFPreView!
    @IBOutlet weak var paginationBox: NSBox!
    
    @IBOutlet weak var pdfPreViewLeftConst: NSLayoutConstraint!
    @IBOutlet weak var pdfPreViewTopConst: NSLayoutConstraint!
    @IBOutlet weak var pdfPreViewRightConst: NSLayoutConstraint!
    
    @IBOutlet weak var paginationTopSpaceConst: NSLayoutConstraint!
    @IBOutlet weak var paginationLeftConst: NSLayoutConstraint!
    @IBOutlet weak var paginationRightConst: NSLayoutConstraint!
    @IBOutlet weak var paginationBottomConst: NSLayoutConstraint!
    
    var contentInset: NSEdgeInsets = .init(top: 16, left: 16, bottom: 16, right: 16) {
        didSet {
            pdfPreViewLeftConst.constant = contentInset.left
            pdfPreViewTopConst.constant = contentInset.top
            pdfPreViewRightConst.constant = contentInset.right
            
            paginationBottomConst.constant = contentInset.bottom
        }
    }
    
    private var pagination_ = ComponentPagination()
    
    var pdfView: CPDFView? {
        get {
            return self.pdfPreView.pdfView
        }
    }
    
    var pageCount: Int {
        get {
            return Int(self.pdfPreView.pdfView.document?.pageCount ?? 0)
        }
    }
    
    deinit {
        KMPrint("KMNPreView deinit.")
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        // Drawing code here.
    }
    
    convenience init(fileUrl: URL, password: String?) {
        self.init()
        
        initSubviews()
        initDefaultValue()
        
        setFileUrl(fileUrl, password: password)
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        initSubviews()
        initDefaultValue()
    }
    
    func initSubviews() {
        self.paginationBox.contentView = self.pagination_
        pagination_.properties = ComponentPaginationProperty(doubleArrow_show: false, currentIndex: 0, totalCount: 1)
        pagination_.delegate = self
    }
    
    func initDefaultValue() {
        self.paginationBox.borderWidth = 0
    }
    
    func setFileUrl(_ fileUrl: URL, password: String?) {
        pdfPreView.setFileUrl(fileUrl, password: password)
    }
    
    func reloadUI() {
        pagination_.properties.totalCount = Int(self.pdfPreView.pdfView.document.pageCount)
        pagination_.properties.currentIndex = self.pdfPreView.pdfView.currentPageIndex + 1
        pagination_.reloadData()
    }
    
}

//MARK: - ComponentPaginationDelegate
extension KMNPreView: ComponentPaginationDelegate {
    public func componentPaginationDidValueChanged(pagination: ComponentPagination) {
//        if choosedIndex != pagination.properties.currentIndex {
//            choosedIndex = pagination.properties.currentIndex
//
//            isGo = false
//
//            refreshGoButton()
        
//        }
        let idx = pagination.properties.currentIndex
        self.pdfPreView.pdfView.go(toPageIndex: idx-1, animated: true)
    }
}