//
//  KMBrowser.swift
//  PDF Reader Pro
//
//  Created by wanjun on 2022/12/9.
//

import Cocoa

@objcMembers class KMBrowser: CTBrowser {
    
    var numberOfTabViewItem: Int = 0
    var isCloseAllTabViewItem: Bool = false
    var currentCloseDocument: KMMainDocument?
    var currentDocument: KMMainDocument?

    deinit {
        KMPrint("KMBrowser deinit.")
    }
    
    override func createBlankTabBased(on baseContents: CTTabContents?) -> CTTabContents {
        return KMMainDocument.init(baseTabContents: baseContents)!
    }
    
    func createNewBrowser() -> KMBrowser {
        let browser = KMBrowser.init() as KMBrowser
        let cls = windowController != nil ? type(of: windowController) : CTBrowserWindowController.self
        browser.windowController = cls.init(browser: browser)
        return browser
    }
    
    override func windowDidBeginToClose() {
        self.currentDocument = NSDocumentController.shared.currentDocument as? KMMainDocument
        
        numberOfTabViewItem = Int(tabCount())
        isCloseAllTabViewItem = true
        closeTabViewItem()
    }
    
    func closeTabViewItem() -> Void {
        if numberOfTabViewItem < 1 {
            window.orderOut(nil)
            tabStripModel.closeAllTabs()
            isCloseAllTabViewItem = false
        } else {
            let currentDocument = tabStripModel.tabContents(at: Int32(numberOfTabViewItem-1)) as! KMMainDocument
            if (currentDocument.isHome == false) {
                currentDocument.mainViewController?.savePageNumberIfNeed()
                if let _isEdited = currentDocument.mainViewController?.listView.isEdited(), _isEdited, !currentDocument.isDocumentEdited {
                    currentDocument.updateChangeCount(.changeDone)
                }
            }
            // 清理数据 [主要清空通知]
            currentDocument.mainViewController?.clearData()
            self._trackCloseDocumentEvent()
            
            if (currentDocument.isEqual(to: self.currentDocument)) {
                // 当前文档 不用提醒，在关闭窗口时已提醒过了
                tabStripModel.detachTabContents(at: Int32(self.numberOfTabViewItem - 1))
                currentDocument.close()
                if (self.isCloseAllTabViewItem) {
                    self.numberOfTabViewItem = self.numberOfTabViewItem - 1
                    self.closeTabViewItem()
                }
                return
            }
            
            let isPrompt = KMPreferenceManager.shared.closeFileIsPrompt()
            if currentDocument.isNewCreated {
                let exist = FileManager.default.fileExists(atPath: currentDocument.fileURL!.path)
                if exist {
                    try? FileManager.default.removeItem(atPath: currentDocument.fileURL!.path)
                }
                currentCloseDocument = currentDocument
                currentDocument.runModalSavePanel(for: .saveAsOperation, delegate: self, didSave: #selector(saveSuccess(_:)), contextInfo: nil)
            } else {
                if currentDocument.isDocumentEdited && isPrompt {
                    currentDocument.watermarkSaveDelegate = self
                    currentDocument.canClose(withDelegate: self, shouldClose: #selector(document(_:shouldClose:contextInfo:)), contextInfo: nil)
                } else if currentDocument.isDocumentEdited {
                    currentDocument.save(nil)
                    currentDocument.close()
                    if self.isCloseAllTabViewItem {
                        numberOfTabViewItem = numberOfTabViewItem - 1
                        closeTabViewItem()
                    }
                } else if (currentDocument.mainViewController != nil) {
                    if (currentDocument.mainViewController!.isPDFDocumentEdited || currentDocument.mainViewController!.needSave) {
                        if (isPrompt) {
                            let alert = NSAlert()
                            let message = "Do you want to save the changes made to the document “\(currentDocument.fileURL!.lastPathComponent)”?"
                            alert.messageText = message
                            alert.informativeText = NSLocalizedString("Your changes will be lost if you don’t save them.", comment: "")
                            alert.addButton(withTitle: NSLocalizedString("Save", comment: ""))
                            alert.addButton(withTitle: NSLocalizedString("Don‘t Save", comment: ""))
                            alert.addButton(withTitle: NSLocalizedString("Cancel", comment: ""))
                            let response = alert.runModal()
                            if (response == .alertFirstButtonReturn) { // 保存
                                currentDocument.save(nil)
                                tabStripModel.detachTabContents(at: Int32(numberOfTabViewItem - 1))
                                currentDocument.close()
                            } else if (response == .alertSecondButtonReturn) { // 不保存
                                tabStripModel.detachTabContents(at: Int32(numberOfTabViewItem - 1))
                                currentDocument.close()
                            } else { // 取消
                                self.isCloseAllTabViewItem = false
                            }
                        } else {
                            currentDocument.save(nil)
                            currentDocument.close()
                        }
                        
                        if isCloseAllTabViewItem {
                            numberOfTabViewItem = numberOfTabViewItem - 1
                            closeTabViewItem()
                        }
                    } else {
                        tabStripModel.detachTabContents(at: Int32(numberOfTabViewItem - 1))
                        currentDocument.close()
                        if isCloseAllTabViewItem {
                            numberOfTabViewItem = numberOfTabViewItem - 1
                            closeTabViewItem()
                        }
                    }
                } else {
                    tabStripModel.detachTabContents(at: Int32(numberOfTabViewItem - 1))
                    currentDocument.close()
                    if isCloseAllTabViewItem {
                        numberOfTabViewItem = numberOfTabViewItem - 1
                        closeTabViewItem()
                    }
                }
            }
        }
    }
    
    override func canCloseContents(at index: Int32) -> Bool {
        let isPrompt = KMPreferenceManager.shared.closeFileIsPrompt()
        if tabContents(at: Int32(index)) != nil {
            let currentDocument = tabContents(at: Int32(index)) as! KMMainDocument
            if (currentDocument.isHome == false) {
                currentDocument.mainViewController?.savePageNumberIfNeed()
                if let _isEdited = currentDocument.mainViewController?.listView.isEdited(), _isEdited, !currentDocument.isDocumentEdited {
                    currentDocument.updateChangeCount(.changeDone)
                }
            }
            
            var canClose = false
            if currentDocument.isNewCreated {
                let exist = FileManager.default.fileExists(atPath: currentDocument.fileURL!.path)
                if exist {
                    try? FileManager.default.removeItem(atPath: currentDocument.fileURL!.path)
                }
                currentCloseDocument = currentDocument
                currentDocument.runModalSavePanel(for: .saveToOperation, delegate: self, didSave: #selector(saveSuccess(_:)), contextInfo: nil)
            } else if (currentDocument.cloud) { /// 云文档
                if (currentDocument.isDocumentEdited) {
                    currentCloseDocument = currentDocument
                    currentDocument.save(withDelegate: self, didSave: #selector(saveSuccess(_:)), contextInfo: nil)
                } else {
                    currentDocument.close()
                    canClose = true
                }
            } else {
                if currentDocument.isDocumentEdited && isPrompt {
                    if currentDocument.isKind(of: KMMainDocument.self) {
                        currentDocument.closedByUserGestureFlag = true
                    }
                    currentDocument.watermarkSaveDelegate = self
                    currentDocument.canClose(withDelegate: self, shouldClose: #selector(document(_:shouldClose:contextInfo:)), contextInfo: nil)
                } else if currentDocument.isDocumentEdited {
                    if (!currentDocument.needSaveWatermark()) {
                        currentDocument.save(nil)
                        currentDocument.close()
                        canClose = true
                    } else {
                        currentDocument.watermarkSaveDelegate = self
                        currentDocument.saveForWatermark()
                        canClose = false
                    }
                } else if (currentDocument.mainViewController != nil) {
                    if (currentDocument.mainViewController!.isPDFDocumentEdited || currentDocument.mainViewController!.needSave) {
                        if (isPrompt) {
                            let alert = NSAlert()
                            let message = "Do you want to save the changes made to the document “\(currentDocument.fileURL!.lastPathComponent)”?"
                            alert.messageText = message
                            alert.informativeText = NSLocalizedString("Your changes will be lost if you don’t save them.", comment: "")
                            alert.addButton(withTitle: NSLocalizedString("Save", comment: ""))
                            alert.addButton(withTitle: NSLocalizedString("Don‘t Save", comment: ""))
                            alert.addButton(withTitle: NSLocalizedString("Cancel", comment: ""))
                            let response = alert.runModal()
                            if (response == .alertFirstButtonReturn) { // 保存
                                if let home = self.tabContents(at: 0) as? KMMainDocument, home.isHome { // 标记 home 最近列表需要强制刷新
                                }
                                
                                currentDocument.save(nil)
                                currentDocument.close()
                                canClose = true
                            } else if (response == .alertSecondButtonReturn) { // 不保存
                                currentDocument.close()
                                canClose = true
                            } else { // 取消
                                canClose = false
                            }
                        } else {
                            currentDocument.save(nil)
                            currentDocument.close()
                            canClose = true
                        }
                    } else {
                        currentDocument.close()
                        canClose = true
                    }
                } else {
                    currentDocument.close()
                    canClose = true
                }
            }
            if (canClose) {
                // 清理数据 [主要清空通知]
                currentDocument.mainViewController?.clearData()
                self._trackCloseDocumentEvent()
            }
            return canClose
        }
        return false
    }
    
    func document(_ document: NSDocument?, shouldClose: Bool, contextInfo: UnsafeMutableRawPointer?) {
        if (document is KMMainDocument) {
            let iu: CloseTypes = CLOSE_USER_GESTURE
            if ((document as! KMMainDocument).closedByUserGestureFlag && shouldClose) {
                (document as! KMMainDocument).closedByUserGesture = uint(iu.rawValue)
            }
            (document as! KMMainDocument).closedByUserGestureFlag = false
        }
        
        if (shouldClose) {
            let currentDocument: KMMainDocument = document! as! KMMainDocument
            let index = self.tabStripModel.index(of: currentDocument)
            // 清空数据 [主要清理通知]
            currentDocument.mainViewController?.clearData()
            self._trackCloseDocumentEvent()
            if index != kNoTab {
                self.tabStripModel.detachTabContents(at: index)
            }
            currentDocument.close()
        }
        
    }
    
    func saveSuccess(_ sender: Any) -> Void {
        if (currentCloseDocument != nil) {
            if (currentCloseDocument!.cloud) { /// 云文档
                currentCloseDocument!.uploadToCloud({ [weak self] finished, error in
                    if (finished) {
                        if (self!.currentCloseDocument == nil) {
                            return
                        }
                        
                        let index = self?.tabStripModel.index(of: self!.currentCloseDocument!)
                        self?.tabStripModel.detachTabContents(at: index!)
                        self!.currentCloseDocument = nil
                        
                        if (self!.isCloseAllTabViewItem) {
                            self!.numberOfTabViewItem = self!.numberOfTabViewItem - 1
                            self!.closeTabViewItem()
                        }
                    }
                })
                return
            }
            
            if let isNewCreated = currentCloseDocument?.isNewCreated, isNewCreated {
                if let _url = currentCloseDocument?.saveToURL { // 将新创建的空白文档将入最近列表
                    NSDocumentController.shared.noteNewRecentDocumentURL(_url)
                }
            }
            
            let index = tabStripModel.index(of: currentCloseDocument)
            tabStripModel.detachTabContents(at: index)
            // 清空数据 [主要清理通知]
            currentCloseDocument?.mainViewController?.clearData()
            currentCloseDocument?.close()
            currentCloseDocument = nil
            self._trackCloseDocumentEvent()
        }
        
        if isCloseAllTabViewItem {
            numberOfTabViewItem = numberOfTabViewItem - 1
            closeTabViewItem()
        }
    }
    
    func addNewTabContents() {
        if (self.tabCount() <= 0) {
            KMPrint("New Tab can‘t add first.")
            return
        }
        
        let contents = self.createBlankTabBased(on: nil)
        contents.isHome = true
        contents.isNewTab = true
        
        self.add(contents, at: -1, inForeground: true)
    }
    
    // MARK: - Private Methods
    
    private func _trackCloseDocumentEvent() {
        FMTrackEventManager.defaultManager.trackEvent(event: "Crash", withProperties: ["Crash_Trig" : "Crash_Trig_CloseDocument"])
    }
}

extension KMBrowser {
    @objc public func canSelectNextTab() -> Bool {
        if (self.tabStripModel.count() < 1) {
            return false
        }
        if (self.tabStripModel.activeIndex >= (self.tabStripModel.count()-1)) {
            return false
        }
        return true
    }
    
    @objc public func canSelectPreviousTab() -> Bool {
        if (self.tabStripModel.activeIndex <= 0) {
            return false
        }
        return true
    }
}