//
//  KMNBookmarkHanddler.swift
//  PDF Reader Pro
//
//  Created by User-Tangchao on 2024/11/8.
//

import Cocoa

@objc protocol KMNBookmarkHanddlerDelegate: NSObjectProtocol {
    @objc optional func handdler(_ handdler: KMNBookmarkHanddler, didAdd bookmark: CPDFBookmark?, info: [String : Any]?)
    @objc optional func handdler(_ handdler: KMNBookmarkHanddler, didRemove bookmark: CPDFBookmark?, info: [String : Any]?)
    
    @objc optional func handdler(_ handdler: KMNBookmarkHanddler, didRemoveAll info: [String : Any]?)
    
    @objc optional func handdler(_ handdler: KMNBookmarkHanddler, didRename bookmark: CPDFBookmark?, info: [String : Any]?)
}

class KMNBookmarkHanddler: NSObject {
    weak var pdfView: CPDFView?
    weak var delegate: KMNBookmarkHanddlerDelegate?
    
    var isSearchMode = false
    var wholeWords = false
    var caseSensitive = false
    var searchKey = ""
    
    func isValidSearchMode() -> Bool {
        if isSearchMode == false {
            return false
        }
        if searchKey.isEmpty {
            return false
        }
        return true
    }
    
    var document: CPDFDocument? {
        get {
            return pdfView?.document
        }
    }
    
    var currentPageIndex: Int {
        get {
            return pdfView?.currentPageIndex ?? 0
        }
    }
    
    func canUndo() -> Bool {
        return pdfView?.undoManager?.canUndo ?? false
    }
    
    func canRedo() -> Bool {
        return pdfView?.undoManager?.canRedo ?? false
    }
    
    func undo() {
        if canUndo() {
            pdfView?.undoManager?.undo()
        }
    }
    
    func redo() {
        if canRedo() {
            pdfView?.undoManager?.redo()
        }
    }
    
    func addCurrentBookmark(callback: ((CPDFBookmark?)->Void)?) {
        let currentPageIndex = self.currentPageIndex
        if let _ = bookmark(for: currentPageIndex) {

        } else {
            let label = "\(NSLocalizedString("Page", comment:"")) \(currentPageIndex + 1)"
            let bookMark = KMBookMarkItem()
            bookMark.label = label
            bookMark.index = UInt(currentPageIndex)
            self._undo_add(label: label, index: currentPageIndex)
            callback?(self.bookmark(for: currentPageIndex))
        }
    }
    
    func removeBookmark(for index: Int) -> Bool {
        guard let bk = self.bookmark(for: index) else {
            return false
        }
        self._undo_remove(label: bk.label, index: bk.pageIndex)
        return true
    }
    
    func removeBookmarks(for indexs: IndexSet) -> Bool {
        var bks: [CPDFBookmark] = []
        for i in indexs {
            if let bk = self.bookmark(for: i) {
                bks.append(bk)
            }
        }
        if bks.isEmpty {
            return false
        }
        _undo_removeAll(bookmarks: bks)
        return true
    }
    
    func removeAllBookmarks() -> Bool {
        guard let bks = document?.bookmarks(), bks.isEmpty == false else {
            return false
        }
        _undo_removeAll(bookmarks: bks)
        return true
    }
    
    @objc func rename(bookmark: CPDFBookmark, label: String) {
        guard let theLabel = bookmark.label, theLabel != label else {
            return
        }
        
        _undo_rename(bookmark: bookmark, label: label)
    }
    
    func bookmark(for pageIndex: Int) -> CPDFBookmark? {
        return document?.bookmark(forPageIndex: UInt(pageIndex))
    }
    
    // MARK: - Private Methods
    
    // MARK: - Undo & Redo
    
    @objc private func _undo_remove(label: String, index: Int) {
        let bookmark = self.bookmark(for: index)
        
        document?.removeBookmark(forPageIndex: UInt(index))
        pdfView?.setNeedsDisplayForVisiblePages()
        
        delegate?.handdler?(self, didRemove: bookmark, info: nil)
        
        (pdfView?.undoManager?.prepare(withInvocationTarget: self) as AnyObject)._undo_add(label: label, index: index)
    }
    
    @objc private func _undo_add(label: String, index: Int) {
        document?.addBookmark(label, forPageIndex: UInt(index))
        pdfView?.setNeedsDisplayForVisiblePages()
        
        delegate?.handdler?(self, didAdd: self.bookmark(for: index), info: nil)
        
        (pdfView?.undoManager?.prepare(withInvocationTarget: self) as AnyObject)._undo_remove(label: label, index: index)
    }
    
    @objc private func _undo_removeAll(bookmarks: [CPDFBookmark]) {
        for bookmark in bookmarks {
            document?.removeBookmark(forPageIndex: UInt(bookmark.pageIndex))
        }
        pdfView?.setNeedsDisplayForVisiblePages()
        
        delegate?.handdler?(self, didRemoveAll: nil)
        
        (pdfView?.undoManager?.prepare(withInvocationTarget: self) as AnyObject)._undo_removeAll_back(bookmarks: bookmarks)
    }
    
    @objc private func _undo_removeAll_back(bookmarks: [CPDFBookmark]) {
        for bookmark in bookmarks {
            document?.addBookmark(bookmark.label, forPageIndex: UInt(bookmark.pageIndex))
        }
        pdfView?.setNeedsDisplayForVisiblePages()
        
        delegate?.handdler?(self, didRemoveAll: nil)
        
        (pdfView?.undoManager?.prepare(withInvocationTarget: self) as AnyObject)._undo_removeAll(bookmarks: bookmarks)
    }
    
    @objc private func _undo_rename(bookmark: CPDFBookmark, label: String) {
        let theLabel = bookmark.label ?? ""
        bookmark.label = label
        
        delegate?.handdler?(self, didRename: bookmark, info: nil)
        
        (pdfView?.undoManager?.prepare(withInvocationTarget: self) as AnyObject)._undo_rename(bookmark: bookmark, label: theLabel)
    }
}