//package bushfighting;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;

//Score用于處理場景中的玩家所得到分數
public class Score
{
    protected int mScore = 0;//當前的分數
    protected int[] mRecordScores;//當前記錄了的分數值，用于記錄最高的幾個分數
    protected String[] mNickNames;//用于記錄對應分數獲得者的昵稱
    private RecordStore mStore = null;//用于保存分數的RecordStore
    private static final String DB_NAME = "bushfighting";//用于保存記錄的RecordStor名
    private final int RECORD_COUNT = 3;//需要記錄的分數個數

    public Score()
    {
        mRecordScores = new int[RECORD_COUNT];
        mNickNames = new String[RECORD_COUNT];
        open();
    }

    //打開存儲的數據集
    public void open()
    {
        try{
            //RecordStore.deleteRecordStore(DB_NAME);
            mStore = RecordStore.openRecordStore(DB_NAME,false);//嘗試打開已經存在的數據集
            loadRecords();//加載本地排行榜記錄
        }
        catch(RecordStoreException rse){
            //這是第一次訪問，數據集還沒有建立
            try{
                mStore = RecordStore.openRecordStore(DB_NAME,true);
                for(int i=0;i<RECORD_COUNT;i++){
                    //將當前記錄的分數值設置為默認值
                    mNickNames[i]= "未知";
                    mRecordScores[i] = 0;
                }
                initScores();//初始化數據集的分數記錄
            }
            catch(Exception e){
                System.out.println("Error initial dataset");
            }
        }
        catch(Exception e){
            System.out.println("Error loading dataset");
        }
        finally{
            closeRecordSet();//關閉打開的數據集
        }
    }

    //重置當前的分數
    public void reset()
    {
        mScore = 0;
    }

    //讀取數據集里面記錄的分數記錄
    private void loadRecords() throws Exception
    {
        byte[] mBuffer = new byte[20];
        ByteArrayInputStream bais = new ByteArrayInputStream(mBuffer);
        DataInputStream dis = new DataInputStream(bais);
        for (int i = 0; i < RECORD_COUNT; i++){
            mStore.getRecord(i + 1, mBuffer, 0);
            mNickNames[i] = dis.readUTF(); //讀取nickName
            mRecordScores[i] = dis.readInt(); //讀取對應的分數
            dis.reset(); //重置輸入流
        }
        dis.close();//關閉打開的輸入流
    }

    //用于在沒有任何數據的情況下初始化，數據集里面的數據
    private void initScores() throws Exception
    {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        byte[] data = null;
        dos.writeUTF("未知");
        dos.writeInt(0);
        data = baos.toByteArray();
        for (int i = 0; i < RECORD_COUNT; i++) //將預設的記錄添加到數據集中
            mStore.addRecord(data,0,data.length);
        dos.close();//關閉打開的數據流
    }

    //增加指定的分數
    public void addScore(int point)
    {
        mScore += point;
    }

    //返回當前的分數
    public int getScore()
    {
        return mScore;
    }

    //判斷是否破記錄了
    public boolean isBreakRecord()
    {
        for(int i=0;i<RECORD_COUNT;i++)
            if(mRecordScores[i]<mScore)
                return true;
        return false;
    }
    //保存當前的分數
    public void saveScore(String nickName)
    {
        //先檢查當前的分數是否足夠高，再決定是否保存
        for(int i=0;i<RECORD_COUNT;i++){
            if (mRecordScores[ i ] < mScore){
                //分數需要保存
                for (int j = RECORD_COUNT - 1; j > i; j--){
                    mRecordScores[j] = mRecordScores[j - 1];
                    mNickNames[j] = mNickNames[j-1];
                }
                mRecordScores[i] = mScore;
                mNickNames[i] = nickName;
                updateRecords(); //更新記錄
                return;
            }
        }
    }

    //更新當前的排行榜
    private void updateRecords()
    {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        byte[] data;
        try{
            mStore = RecordStore.openRecordStore(DB_NAME,false);
            for (int i = 0; i < RECORD_COUNT; i++){
                dos.writeUTF(mNickNames[i]);
                dos.writeInt(mRecordScores[i]);
                data = baos.toByteArray();
                mStore.setRecord(i + 1, data, 0, data.length); //更新記錄
                baos.reset();
            }
            dos.close(); //關閉打開的輸入流
        }
        catch(Exception e){
            System.out.println("Error updating records");;
        }
        finally{
            closeRecordSet();//重新關閉打開的數據集
        }
    }

    //關閉打開的數據集
    private void closeRecordSet()
    {
        try{
            if (mStore != null)
                mStore.closeRecordStore();
            mStore = null;
        }
        catch(RecordStoreException rse){
            //System.out.println("Eorror occured when close mStore");
        }
    }
}