package com.zhangmeng.tools.controller;

import com.zhangmeng.tools.components.RecursiveFileList;
import com.zhangmeng.tools.languages.ProcessJava;
import com.zhangmeng.tools.utils.AlertUtils;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.SplitPane;
import javafx.scene.image.Image;
import javafx.stage.DirectoryChooser;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.FilenameUtils;
import org.fxmisc.flowless.VirtualizedScrollPane;
import org.fxmisc.richtext.CodeArea;
import org.fxmisc.richtext.LineNumberFactory;
import org.fxmisc.richtext.model.StyleSpans;
import org.fxmisc.richtext.model.StyleSpansBuilder;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.Collection;
import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author : 芊芊墨客
 * @version : 1.0
 * @date : 2023-06-01 10:44
 *
 * 文本编辑器
 */
@Slf4j
public class FileEditController {


    public SplitPane splitPane;

    private CodeArea codeArea;
    private RecursiveFileList recursiveFileList = null;

    @FXML
    public void initialize() {
        recursiveFileList = new RecursiveFileList(null);
        codeArea = new CodeArea();
        URL resource = this.getClass().getClassLoader().getResource("css/code.css");
        codeArea.setParagraphGraphicFactory(LineNumberFactory.get(codeArea));
        codeArea.textProperty().addListener((obs, oldText, newText) -> {
            codeArea.setStyleSpans(0, computeHighlighting(newText));
        });
        codeArea.getStylesheets().add(resource.toExternalForm());
        splitPane.getItems().add(0,recursiveFileList);
        splitPane.getItems().add(1,new VirtualizedScrollPane<>(codeArea));
        splitPane.setDividerPosition(0,0.20);
        splitPane.setDividerPosition(1,0.80);
    }

    @FXML
    public void open_file_dir(ActionEvent event) {
        open_file_dir();
    }

    public void open_file(File file){
        byte[] bytes = new byte[0];
        try {
            bytes = Files.readAllBytes(file.toPath());
        } catch (IOException e) {
            e.printStackTrace();
        }
        String file_content = new String(bytes, StandardCharsets.UTF_8);
        codeArea.clear();
        codeArea.replaceText(0, 0, file_content);
    }

    public void open_file_dir(){

        Stage stage = new Stage();
        DirectoryChooser dc = new DirectoryChooser();
        dc.setTitle("文件夹选择");
        File file = dc.showDialog(stage);
        if (file != null) {
            if (file.isDirectory()){
                splitPane.getItems().clear();
                recursiveFileList = new RecursiveFileList(file) ;
                recursiveFileList.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
                    if (newValue.getValue().isFile()) {
                        String extension = FilenameUtils.getExtension(newValue.getValue().getName());
                        boolean flag = true;

                        if (extension.equals("mp4")){
                            flag = false;
                        }

                        if (extension.equals("jpg")){
                            flag = false;
                        }

                        if (extension.equals("png")){
                            flag = false;
                        }

                        if (extension.equals("avi")){
                            flag = false;
                        }

                        if (extension.equals("zip")){
                            flag = false;
                        }

                        if (extension.equals("ico")){
                            flag = false;
                        }
//
//                        if (extension.equals("json")){
//                            flag = true;
//                        }
//
//                        if (extension.equals("go")){
//                            flag = true;
//                        }
//
//                        if (extension.equals("js")){
//                            flag = true;
//                        }
//
//                        if (extension.equals("css")){
//                            flag = true;
//                        }
//
//                        if (extension.equals(".xml")){
//                            flag = true;
//                        }
                        if (flag){
                            open_file(newValue.getValue());
                        }else {
                            AlertUtils.alert_warning("该文件不支持!");
                        }
                    }
                });

                splitPane.getItems().add(0,recursiveFileList);
                splitPane.getItems().add(1,new VirtualizedScrollPane<>(codeArea));
                splitPane.setDividerPosition(0,0.20);
                splitPane.setDividerPosition(1,0.80);
            }
        }
    }

    public static StyleSpans<Collection<String>> computeHighlighting(String text) {
        Matcher matcher = ProcessJava.PATTERN.matcher(text);
        int lastKwEnd = 0;
        StyleSpansBuilder<Collection<String>> spansBuilder = new StyleSpansBuilder<>();
        while(matcher.find()) {
            String styleClass =
                    matcher.group("KEYWORD") != null ? "keyword" :
                            matcher.group("PAREN") != null ? "paren" :
                                    matcher.group("BRACE") != null ? "brace" :
                                            matcher.group("BRACKET") != null ? "bracket" :
                                                    matcher.group("SEMICOLON") != null ? "semicolon" :
                                                            matcher.group("STRING") != null ? "string" :
                                                                    matcher.group("COMMENT") != null ? "comment" :
                                                                            matcher.group("ANNOTATION") != null ? "annotation" :
                                                                                    matcher.group("PARAMS") != null ? "parameter" :
                                                                                            null; /* never happens */
            assert styleClass != null;
            spansBuilder.add(Collections.emptyList(), matcher.start() - lastKwEnd);
            spansBuilder.add(Collections.singleton(styleClass), matcher.end() - matcher.start());
            lastKwEnd = matcher.end();
        }
        spansBuilder.add(Collections.emptyList(), text.length() - lastKwEnd);
        return spansBuilder.create();
    }

}