//
//  KMHomeInsertActionViewController.swift
//  PDF Reader Pro
//
//  Created by wanjun on 2022/11/24.
//

import Cocoa

enum KMInsertScopeType : Int {
    case firstPage = 0
    case lastPage
    case customizePage
}

enum KMPageScopeType : Int {
    case previous = 0
    case next
}

protocol KMHomeInsertActionViewControllerDelegate: NSObjectProtocol {
    func insertActionViewController(_ viewController: KMHomeInsertActionViewController, fromFilePath: URL)
    func insertActionViewController(_ viewController: KMHomeInsertActionViewController, insertScopeType: KMInsertScopeType, currentPage: Int, pageScope: KMPageScopeType)
}

class KMHomeInsertActionViewController: NSViewController {
    
    @IBOutlet weak var insertFileLabel: NSTextField!
    @IBOutlet weak var selectFileBox: NSBox!
    @IBOutlet weak var selectFileTextField: NSTextField!
    @IBOutlet weak var selectBox: KMBox!
    @IBOutlet weak var selectLabel: NSTextField!
    @IBOutlet weak var positionInsertLabel: NSTextField!
    @IBOutlet weak var firstPageBox: KMBox!
    @IBOutlet weak var firstPageImageView: NSImageView!
    @IBOutlet weak var firstPageLabel: NSTextField!
    @IBOutlet weak var lastPageBox: KMBox!
    @IBOutlet weak var lastPageImageView: NSImageView!
    @IBOutlet weak var lastPageLabel: NSTextField!
    @IBOutlet weak var customizePageBox: KMBox!
    @IBOutlet weak var customizePageImageView: NSImageView!
    @IBOutlet weak var customizePageLabel: NSTextField!
    @IBOutlet weak var currentPageNumberBox: NSBox!
    @IBOutlet weak var currentPageNumberTextField: NSTextField!
    @IBOutlet weak var totalPageNumberLabel: NSTextField!
    @IBOutlet weak var pageScopeBox: NSBox!
    @IBOutlet weak var pageScopePopUpButton: NSPopUpButton!
    
    var insertScopeType: KMInsertScopeType! = .firstPage
    var pageScopeType: KMPageScopeType! = .previous
    var fromFilePath: URL!
    var currentPageCount: Int! = 1
    var pdfDocument: CPDFDocument? = nil
    open weak var delete: KMHomeInsertActionViewControllerDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.
        
        initializeUI()
        initLocalization()
        
        selectBox.downCallback = { [weak self] (downEntered: Bool, mouseBox: KMBox, event) -> Void in
            if downEntered {
                if self != nil {
                    self!.selectButtonAction(self!.selectBox)
                }
            }
        }
        firstPageBox.downCallback = { [weak self] (downEntered: Bool, mouseBox: KMBox, event) -> Void in
            if downEntered {
                if self != nil {
                    self!.insertScopeType = .firstPage
                    self!.reloadData()
                }
            }
        }
        lastPageBox.downCallback = { [weak self] (downEntered: Bool, mouseBox: KMBox, event) -> Void in
            if downEntered {
                if self != nil {
                    self!.insertScopeType = .lastPage
                    self!.reloadData()
                }
            }
        }
        customizePageBox.downCallback = { [weak self] (downEntered: Bool, mouseBox: KMBox, event) -> Void in
            if downEntered {
                if self != nil {
                    self!.insertScopeType = .customizePage
                    self!.reloadData()
                }
            }
        }
    }
    
    override func viewDidAppear() {
        super.viewDidAppear()
        
        reloadData()
    }
    
    // MARK: Init
    
    func initializeUI() -> Void {
        pageScopePopUpButton.menu = pageScopeMenu
        let menus = pageScopeMenu.items
        var opIndex = 0
        for item: NSMenuItem in menus {
            item.target = self
            item.tag = opIndex
            item.action = #selector(self.pageScopePopUpButtonAction(_:))
            opIndex += 1
        }
        
        selectFileTextField.textColor = .black
        selectFileTextField.isEnabled = false
    }
    
    func initLocalization() -> Void {
        insertFileLabel.stringValue = NSLocalizedString("插入文件", comment: "")
        selectFileTextField.placeholderString = String(format: " " + NSLocalizedString("选择文件", comment: ""))
        selectBox.toolTip = NSLocalizedString("选择", comment: "")
        selectLabel.stringValue = NSLocalizedString("选择", comment: "")
        positionInsertLabel.stringValue = NSLocalizedString("插入位置", comment: "")
        firstPageBox.toolTip = NSLocalizedString("第一页", comment: "")
        firstPageLabel.stringValue = NSLocalizedString("第一页", comment: "")
        lastPageBox.toolTip = NSLocalizedString("最后一页", comment: "")
        lastPageLabel.stringValue = NSLocalizedString("最后一页", comment: "")
        customizePageBox.toolTip = NSLocalizedString("页面", comment: "")
        customizePageLabel.stringValue = NSLocalizedString("页面", comment: "")
        
    }

    // MARK: private

    func reloadData() -> Void {
        firstPageImageView.image = NSImage(named: "KMImageNameUnSelect")
        lastPageImageView.image = NSImage(named: "KMImageNameUnSelect")
        customizePageImageView.image = NSImage(named: "KMImageNameUnSelect")
        pageScopePopUpButton.isEnabled = false
        pageScopeBox.borderColor = .gray
        
        switch insertScopeType {
        case .firstPage:
            firstPageImageView.image = NSImage(named: "KMImageNameSelect")
        case .lastPage:
            lastPageImageView.image = NSImage(named: "KMImageNameSelect")
        case .customizePage:
            customizePageImageView.image = NSImage(named: "KMImageNameSelect")
            pageScopePopUpButton.isEnabled = true
            pageScopeBox.borderColor = .black
        case .none:
            firstPageImageView.image = NSImage(named: "KMImageNameSelect")
        }
        
        currentPageNumberTextField.stringValue = String(currentPageCount)
        let pageCount = pdfDocument?.pageCount
        totalPageNumberLabel.stringValue = String(format: "/ %ld", pageCount!)
        
        self.delete?.insertActionViewController(self, insertScopeType: insertScopeType, currentPage: currentPageCount, pageScope: pageScopeType)
    }
    
    lazy var pageScopeMenu: NSMenu = {
        let pageScopeMenu = NSMenu()
        var item = NSMenuItem()
        item.title = NSLocalizedString("After", comment: "")
        pageScopeMenu.addItem(item)
        item = NSMenuItem()
        item.title = NSLocalizedString("Before", comment: "")
        pageScopeMenu.addItem(item)
        return pageScopeMenu
    }()
    
    // MARK: Action
    @IBAction func pageScopePopUpButtonAction(_ sender: NSMenuItem) -> Void {
        let item = sender
        let index = item.tag
        if index == 0 {
            pageScopeType = .next
        } else if index == 1 {
            pageScopeType = .previous
        }
        reloadData()
    }
    
    @IBAction func selectButtonAction(_ sender: KMBox) -> Void {
        let openPanel = NSOpenPanel()
        openPanel.allowedFileTypes = ["pdf"]
        
        openPanel.beginSheetModal(for: self.view.window!) { result in
            if result == .OK {
                for fileURL in openPanel.urls {
                    let pdfDoc = CPDFDocument(url: fileURL)!
                    if (pdfDoc.isLocked) {
                        
                    } else {
                        self.fromFilePath = fileURL
                        self.selectFileTextField.stringValue = self.fromFilePath.path
                        
                        self.delete?.insertActionViewController(self, fromFilePath: self.fromFilePath)
                    }
                }
            }
        }
    }
}