//
//  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 resultCount = 0
    
    var searchSectionResults: [KMBotaSearchSectionModel] = []
    var searchResults: [KMSearchMode] = []
    
    // 创建一个串行队列
    private let searchQueue = DispatchQueue(label: "com.pdfkit.searchQueue")
    
    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 isEditing() -> Bool {
        return pdfView?.isEditing() ?? false
    }
    
    private var searchTimer: Timer?
    private let debounceInterval: TimeInterval = 1.0 // 0.3秒的延迟
    func search(keyword: String, isCase: Bool, isWholeWord: Bool, isEdit: Bool = false, callback: @escaping (([KMBotaSearchSectionModel]) -> Void)) {
        searchTimer?.invalidate()
        
        searchTimer = Timer.scheduledTimer(withTimeInterval: debounceInterval, repeats: false) { [weak self] _ in
            self?.searchQueue.sync {
                // 在这里执行同步任务
                print("Executing task synchronously in searchQueue")
                self?._search(keyword: keyword, isCase: isCase, isWholeWord: isWholeWord, isEdit: isEdit, callback: callback)
            }
        }
    }
    
    func _search(keyword: String, isCase: Bool, isWholeWord: Bool, isEdit: Bool = false, callback: @escaping (([KMBotaSearchSectionModel]) -> Void)) {
        guard let document = self.pdfView?.document else {
            NSSound.beep()
            self.clear()
            callback([])
            return
        }
        
        if document.isFinding {
            document.cancelFindString()
        }
        
        if keyword.isEmpty {
            self.clear()
            callback([])
            return
        }
        
        let theKeyword = keyword.decomposedStringWithCompatibilityMapping
        
        var opt = CPDFSearchOptions(rawValue: 0)
        if isCase {
            opt.insert(.caseSensitive)
        }
        
        if isWholeWord {
            opt.insert(.matchWholeWord)
        }
        DispatchQueue.global().async {
            var result: [[CPDFSelection]] = []
            if isEdit {
                result = document.findEditAllPageString(theKeyword, with: opt) ?? []
            } else {
                result = document.findString(theKeyword, with: opt) ?? []
            }
            
            self.clear()
            for sels in result {
                let sectionM = KMBotaSearchSectionModel()
                guard let page = sels.first?.page else { continue }
                sectionM.pageIndex = Int(page.pageIndex())
                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(KMNColorTools.colorWarning_base().withAlphaComponent(0.5))
                    
                    self.searchResults.append(mode)
                }
                
                self.searchSectionResults.append(sectionM)
            }
            
            DispatchQueue.main.async {
                self.searchKey = theKeyword
                self.showIdx = 0
                self.resultCount = self.searchResults.count
                callback(self.searchSectionResults)
            }
        }
    }
    
    func clear() {
        self.searchResults.removeAll()
        self.searchSectionResults.removeAll()
        
        self.searchKey = ""
        self.showIdx = 0
        self.resultCount = 0
    }
    
    func startFindEditText(page: CPDFPage, searchString: String, options: CPDFSearchOptions) -> [[CPDFSelection]] {
        let datas = self.pdfView?.document.startFindEditText(from: page, with: searchString, options: options) ?? []
        return datas
    }
    
    func replace(searchS: String, replaceS: String?, sel: CPDFSelection, isEdit: Bool = false, callback: @escaping ((CPDFSelection?)->Void)) {
        self.pdfView?.document.replace(with: sel, search: searchS, toReplace: replaceS, completionHandler: { newSel in
            callback(newSel)
        })
    }

    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
        }

        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()
    }
}

extension KMNSearchHanddler {
    func next() -> Int {
        var index = self.showIdx
        index = index + 1
        index = min(index, self.searchResults.count - 1)
        self.showIdx = index
        return index
    }
    
    func previous() -> Int {
        var index = self.showIdx
        index = index - 1
        index = max(index, 0)
        self.showIdx = index
        return index
    }
}