//
//  KMNSearchHanddler.swift
//  PDF Reader Pro
//
//  Created by User-Tangchao on 2024/12/1.
//

import Cocoa

class KMNSearchHanddler: NSObject {
    weak var pdfView: CPDFView?
    
    var type: KMNBotaSearchType = .search
    
    var searchKey: String?
    var replaceKey: String?
    
    var showIdx = 0
    
    var searchSectionResults: [KMBotaSearchSectionModel] = []
    var searchResults: [KMSearchMode] = []
    
    func hideNotes() -> Bool {
        let listView = pdfView as? CPDFListView
        return  listView?.hideNotes ?? false
    }
    
    func allowsNotes() -> Bool {
        let listView = pdfView as? CPDFListView
        return listView?.allowsNotes() ?? false
    }
    
    func pdfDocument() -> CPDFDocument? {
        return pdfView?.document
    }
    
    func scaleFactor() -> CGFloat? {
        return pdfView?.scaleFactor
    }
    
    func search(keyword: String, isCase: Bool, isWholeWord: Bool, callback: @escaping (([KMBotaSearchSectionModel]?) -> Void)) {
        guard let document = self.pdfView?.document else {
            NSSound.beep()
            callback(nil)
            return
        }
        if document.isFinding {
            document.cancelFindString()
        }
        if keyword.isEmpty {
            callback(nil)
            return
        }
        
        let theKeyword = keyword.decomposedStringWithCompatibilityMapping
        searchKey = theKeyword
        
        var opt = CPDFSearchOptions()
        if isCase {
            opt.insert(.caseSensitive)
        }
        if isWholeWord {
            opt.insert(.matchWholeWord)
        }
        DispatchQueue.global().async {
            let result = document.findString(theKeyword, with: opt)
            
            self.searchResults.removeAll()
            self.searchSectionResults.removeAll()
            for sels in result ?? [] {
                let sectionM = KMBotaSearchSectionModel()
                sectionM.pageIndex = Int(sels.first?.page.pageIndex() ?? 0)
                for sel in sels {
                    let mode : KMSearchMode = KMSearchMode()
                    mode.selection = sel
                    mode.attributedString = KMOCToolClass.getAttributedString(selection: sel, keyword: theKeyword)
                    mode.selectionPageIndex = document.index(for: sel.page)
                    sectionM.items.append(mode)

                    sel.setColor(NSColor(red: 236/255.0, green: 241/255.0, blue: 83/255.0, alpha: 0.5))
                    
                    self.searchResults.append(mode)
                }
                
                self.searchSectionResults.append(sectionM)
            }
            
            DispatchQueue.main.async {
                callback(self.searchSectionResults)
            }
        }
    }
    
    func replace(searchS: String, replaceS: String?, sel: CPDFSelection, callback: @escaping ((CPDFSelection?)->Void)) -> Bool {
        return self.pdfView?.document.replace(with: sel, search: searchS, toReplace: replaceS, completionHandler: { newSel in
            callback(newSel)
        }) ?? false
    }

    func showSelection(_ sel: CPDFSelection?) {
        guard let theSel = sel else {
            let isEditing = self.pdfView?.isEditing() ?? false
            if isEditing {
                self.pdfView?.setHighlightedSelection(nil, animated: true)
            } else {
                self.pdfView?.setHighlightedSelections([])
            }
            self.pdfView?.setNeedsDisplayAnnotationViewForVisiblePages()
            return
        }
        guard let document = self.pdfView?.document else {
            return
        }
        
        theSel.setColor(NSColor(red: 236/255.0, green: 241/255.0, blue: 83/255.0, alpha: 0.5))
        
        let pageIdx = document.index(for: theSel.page)
        self.pdfView?.go(toPageIndex: Int(pageIdx), animated: false)
        self.pdfView?.go(to: theSel.bounds, on: theSel.page)
        let isEditing = self.pdfView?.isEditing() ?? false
        if isEditing {
            self.pdfView?.setHighlightedSelection(theSel, animated: true)
        } else {
            self.pdfView?.setHighlightedSelections([theSel])
        }
        self.pdfView?.setNeedsDisplayAnnotationViewForVisiblePages()
    }
    
    func clearData() {
        let isEditing = self.pdfView?.isEditing() ?? false
        if isEditing {
            self.pdfView?.setHighlightedSelection(nil, animated: false)
        } else {
            self.pdfView?.setHighlightedSelections([])
        }
        self.pdfView?.setNeedsDisplayAnnotationViewForVisiblePages()
    }
}