package FileOperation;
import Main.MainFrame;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileNameExtensionFilter;
/**
 *@description ��ϣ�ʵ�ֶ��ļ��˵��µ�ȫ������
 * @author С·
 * @date 2013-05-07
 */
public class FileOperation {
    private MainFrame mf;
    public FileOperation(MainFrame mf)
    {
        this.mf = mf;
    }
    //ʵ�ְ�Ŀ���ı����ݶ�����ǰ�ı����еķ�������Ҫ�ѱ��򿪵��ļ���·����������
    public void readTo()
    {
           JFileChooser chooser = new JFileChooser("C:/Documents and Settings/Administrator/����/�¼��±��������ļ���");
           chooser.setSelectedFile(new File("*.txt"));//����Ĭ��ѡ���ļ����
           FileNameExtensionFilter filter = new FileNameExtensionFilter("txt & TXT�ı��ļ�", "txt", "TXT");//���ÿ�ѡ�ļ���׺��
           chooser.setAcceptAllFileFilterUsed(false);//ȡ�������ļ�ѡ��
           chooser.setFileFilter(filter);
           while(chooser.showOpenDialog(mf)==0)
           {
              //��ʱ�ļ��϶���.txt��ʽ����.TXT��ʽ�ģ���˲���Ҫ���жϺ�׺����,ֻ��Ҫ�ж��Ƿ�ѡ�����ĵ��ļ�
              File file = chooser.getSelectedFile();
              mf.set_tempfile(file);//���浱ǰ�򿪵��ļ���·��
              if(file.exists())
               {
                  mf.setTitle(file.getName());
                  try {
                       BufferedReader reader = new BufferedReader(new FileReader(file.getAbsoluteFile()));
                  try {
                      String tmp = reader.readLine();
                      while(tmp!=null)
                       {
                           mf.getMainText().append(tmp+"\n");
                           tmp = reader.readLine();
                       }
                       } catch (IOException ex) {
                                JOptionPane.showMessageDialog(mf, "��ȡ�ļ�ʧ�ܣ�");
                            }
                           
                            //������
                        } catch (FileNotFoundException ex) {
                            JOptionPane.showMessageDialog(mf, "��ȡ�ļ�·��ʧ�ܣ�");
                        }
                    break;
                }
          }
          //�ɹ���ȡ�ļ�֮����changed��ʼֵΪfalse
           mf.set_changed(false);
    }
    //ʵ�ְѵ�ǰ�ı��������д�뵽Ŀ��·���µķ���
    public Boolean writeBack(File file)
    {
        try {
                file.createNewFile();
                FileWriter writer = new FileWriter(file);
                BufferedWriter bufferwriter = new BufferedWriter(writer);
                mf.getMainText().selectAll();
                String [] txt = mf.getMainText().getSelectedText().split("\n");
                for(int i = 0;i<txt.length;i++)
                {
                    bufferwriter.write(txt[i]);
                    bufferwriter.newLine();
                }
                bufferwriter.close();
                writer.close(); 
                mf.set_changed(false);//��дһ��֮�󣬴�ʱ��ǰ�ı�û�б��޸�
                return true;
            } catch (IOException ex) {
            JOptionPane.showMessageDialog(mf, "�����ļ�ʧ�ܣ�");
            return false;
            }
    }
    //ʵ��ɾ���ļ�
    public void deleteFile(File file)
    {
        if(!file.delete())
        {
            JOptionPane.showMessageDialog(mf, "�˳�ʱɾ���ļ�����", "����",JOptionPane.ERROR_MESSAGE);
        }
    }
    //ʵ���½��ļ�
    public void createFile()
    {
        if(mf.get_changed())
        {
            int result = JOptionPane.showConfirmDialog(mf, "�ļ��Ѿ��޸ģ��Ƿ񱣴浱ǰ�ļ���",
                    "ѯ��",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
            if(result==0)
            {
                 //���ñ��淽��
                saveFile();
                mf.setFile();//�½��ĵ�
                mf.getMainText().setText("");
                mf.set_changed(false);
            }
            else if(result==1)
            {
                mf.setFile();
                mf.getMainText().setText("");
                mf.set_changed(false);
            }
        }
        else
        {
            mf.setFile();
            mf.getMainText().setText("");
            mf.set_changed(false);
        }
    }
    //ʵ�ִ��ļ�
    public void openFile()
    {
        if(mf.get_changed())
        {
            int result = JOptionPane.showConfirmDialog(mf, "�ļ��Ѿ��޸ģ��Ƿ񱣴浱ǰ�ļ���",
                    "ѯ��",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
            if(result==0)
            {
                //���ѡ�񱣴棬���ȱ��浱ǰ�ļ����ٰ�Ҫ�򿪵��ļ������ֶ��뵽��ǰ�ı�����
                saveFile();
                mf.getMainText().setText("");
                readTo();
            }
            else if(result==1)
            {
                mf.getMainText().setText("");
                readTo();
            }
        }
        else
        {
            //���ǰ�ļ�û���޸ģ���ֱ�Ӵ�Ŀ���ļ�
            mf.getMainText().setText("");
            readTo();
        }
    }
    //ʵ�ֱ����ļ�
    public void saveFile()
    {
        writeBack(mf.get_tempfile());
        int length = mf.getMainText().getText().length();
        mf.getMainText().setCaretPosition(length);
    }
    //ʵ���ļ����Ϊ
    public void saveasFile()
    {
        JFileChooser chooser = new JFileChooser("C:/Documents and Settings/Administrator/����/�¼��±��������ļ���");
        chooser.setSelectedFile(new File("*.txt"));//����Ĭ��ѡ���ļ����
        FileNameExtensionFilter filter = new FileNameExtensionFilter("txt & TXT�ı��ļ�", "txt", "TXT");//���ÿ�ѡ�ļ���׺��
        chooser.setAcceptAllFileFilterUsed(false);//ȡ�������ļ�ѡ��
        chooser.setFileFilter(filter);
        while( chooser.showSaveDialog(mf)==0)
        {
            File file = chooser.getSelectedFile();
            //��ú�׺���.��ʼ������(lastIndexOf(".")����.���ַ������һ�γ��ֵ����ֵ����subString(int beginIndex))
            String str = file.getName().substring(file.getName().lastIndexOf("."));
            if(str.equals(".txt")||str.equals(".TXT"))
            {
                if(file.exists())
                {
                     int result = JOptionPane.showConfirmDialog(mf, "�ļ��Ѵ��ڣ��Ƿ񸲸��ļ���","ѯ��",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);
                     if(result==0)
                     {
                         //��ɾ���Ŀ¼�µ�ԭ�ļ������½�һ��ͬ����ļ������д������
                         file.delete();
                         if(writeBack(file))
                         {
                             mf.getMainText().setText("");//������
                             break; //�رմ���
                         }
                     }
                }
                else
                {
                    if(writeBack(file))
                    {
                        mf.getMainText().setText("");//������
                        break;
                    }
                }
            }
            else
            {
                JOptionPane.showMessageDialog(mf, "��������ļ����ʽ���ԣ�Ϊ����������ļ������������룡");
            }
        }
        //����֮���޸ı���
        mf.setTitle("�¼��±�");
        //�޸�changedΪfalse
        mf.set_changed(false);
    }
    //ʵ��ҳ�����÷���
    public void pageSetup()
    {
        //���Ҹ�Windows�µļ��±��д˹���һ����Ի�����Ҫ��һ���Ľ�
        JOptionPane.showConfirmDialog(null,"�������ִ�����ӡ����ص���������ҳ�����û��ӡһ��"
                + "�ĵ���֮ǰ��������Ѿ���װ��ӡ���������ڰ�װ��ӡ����", "ѯ��", 
                JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
    }
    //ʵ�ִ�ӡ����
    public void print()
    {
        //�鿴��û�а�װ��ӡ��
        JOptionPane.showConfirmDialog(mf,"�������ִ�����ӡ����ص���������ҳ�����û��ӡһ��"
                   + "�ĵ���֮ǰ��������Ѿ���װ��ӡ���������ڰ�װ��ӡ����", "ѯ��", 
                   JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
    }
    //ʵ���˳�����
    public void exit()
    {
        if(mf.get_changed() == true)
        {
            int result = JOptionPane.showConfirmDialog(null, "�ļ��Ѿ��޸ģ��Ƿ����˳�֮ǰ�����ļ���",
                    "ѯ��",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
            if(result == JOptionPane.OK_OPTION)
            {
                saveFile();
                mf.dispose();
                System.exit(0);
            }
            else if(result==JOptionPane.CANCEL_OPTION)
            {
               //�����棬�����д����ļ�
               mf.dispose();
               System.exit(0);
            }
        }
        else
        {
            int result = JOptionPane.showConfirmDialog(mf, "��ȷ��Ҫ�˳���", "ѯ��", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null);
            if(result==JOptionPane.OK_OPTION)
            {
                mf.dispose();
                System.exit(0);
            }  
        }
    }
}