package com.horse.util;
import java.text.DecimalFormat;
import java.util.Vector;

import com.horse.bean.Chapter;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.text.format.Time;

/**
 * 這個類的目的是為在看書翻頁時，需要進(jìn)行的動作提供接口。
 * 包括翻向下一頁，翻向上一頁。在翻到每章最后一頁時，如果后面還有章節(jié)就繼續(xù)翻向下一章節(jié)，沒有就向用戶顯示已讀完。
 * 在翻向上一章節(jié)時，如果前面還有章節(jié)，就翻到上一章節(jié)，沒有就向用戶顯示，這已經(jīng)是第一章節(jié)。
 * 
 * 在直覺上認(rèn)為這個應(yīng)該只設(shè)置成一個接口，因為只需向視圖層提供動作接口，也就是本類應(yīng)屬于模型層。則其設(shè)置為一個借口可能也合適。
 * 但是如果設(shè)置成一個接口，那么接口的實現(xiàn)類，有多個都要保存的數(shù)據(jù)。那么為了代碼重用，抽象類可能比接口更加合適。 上面是個人分析，可能不是很合適。
 * 
 * @author MJZ
 * 
 */
public class BookPage {
 // configuration information
 private int screenWidth; // 屏幕寬度
 private int screenHeight; // 屏幕高度
 private int fontSize; // 字體大小
 private int lineHgight; //每行的高度
 private int marginWidth = 15; // 左右與邊緣的距離
 private int marginHeight = 15; // 上下與邊緣的距離
 private int textColor; // 字體顏色
 private Bitmap bgBitmap; // 背景圖片
 private int bgColor; // 背景顏色

 private Paint paint;
 private Paint paintBottom;
 private int visibleWidth; // 屏幕中可顯示文本的寬度
 private int visibleHeight;
 private Chapter chapter; // 需要處理的章節(jié)對象
 private Vector<String> linesVe; // 將章節(jié)內(nèi)容分成行，并將每頁按行存儲到vector對象中
 private int lineCount; // 一個章節(jié)在當(dāng)前配置下一共有多少行

 private String content;
 private int chapterLen; // 章節(jié)的長度
 // private int curCharPos; // 當(dāng)前字符在章節(jié)中所在位置
 private int charBegin; // 每一頁第一個字符在章節(jié)中的位置
 private int charEnd; // 每一頁最后一個字符在章節(jié)中的位置
 private boolean isfirstPage;
 private boolean islastPage;

 private Vector<Vector<String>> pagesVe;
 int pageNum;

 /**
 * 在新建一個BookPage對象時，需要向其提供數(shù)據(jù)，以支持屏幕翻頁功能。
 * 
 * @param screenWidth
 *      屏幕寬度，用來計算每行顯示多少字
 * @param screenHeight
 *      屏幕高度，用來計算每頁顯示多少行
 * @param chapter
 *      章節(jié)對象
 */
 public BookPage(int screenWidth, int screenHeight, Chapter chapter) {
 this.screenHeight = screenHeight;
 this.screenWidth = screenWidth;
 this.chapter = chapter;
 init();
 }

 /**
 * 初始最好按照定義變量的順序來初始化，統(tǒng)一。在將來需要修改某個變量的時候，容易找到。 對代碼維護(hù)應(yīng)該也很有用吧。
 */
 protected void init() {
 bgBitmap = null;
 bgColor = 0xffff9e85;
 textColor = Color.BLACK;
 content = chapter.getContent();
 chapterLen = content.length();
 // curCharPos = 0;
 charBegin = 0;
 charEnd = 0;
 fontSize = 30;
 lineHgight = fontSize + 8;
 linesVe = new Vector<String>();

 paint = new Paint(Paint.ANTI_ALIAS_FLAG);
 paint.setTextAlign(Align.LEFT);
 paint.setTextSize(fontSize);
 paint.setColor(textColor);
 
 paintBottom = new Paint(Paint.ANTI_ALIAS_FLAG);
 paintBottom.setTextAlign(Align.LEFT);
 paintBottom.setTextSize(fontSize / 2);
 paintBottom.setColor(textColor);

 visibleWidth = screenWidth - marginWidth * 2;
 visibleHeight = screenHeight - marginHeight * 2;
 lineCount = visibleHeight / lineHgight - 2;
 isfirstPage = true;
 islastPage = false;
 pagesVe = new Vector<Vector<String>>();
 pageNum = -1;
 slicePage();
 }

 public Vector<String> getCurPage() {
 return linesVe;
 }

 protected void slicePage() {
 pagesVe.clear();
 int curPos = 0;
 while (curPos < chapterLen) {
  Vector<String> lines = new Vector<String>();
  charBegin = curPos;
  while (lines.size() < lineCount && curPos < chapterLen) {
  int i = content.indexOf("\n", curPos);
  String paragraphStr = content.substring(curPos, i);
  // curCharPos += i;
  if (curPos == i)
   lines.add("");

  while (paragraphStr.length() > 0) {
   int horSize = paint.breakText(paragraphStr, true,
    visibleWidth, null);
   lines.add(paragraphStr.substring(0, horSize));
   paragraphStr = paragraphStr.substring(horSize);
   curPos += horSize;
   if (lines.size() > lineCount)
   break;
  }
  // 如果是把一整段讀取完的話，需要給當(dāng)前位置加1
  if (paragraphStr.length() == 0)
   curPos += "\n".length();
  }
  pagesVe.add(lines);
 }

 }

 /**
 * 翻到下一頁
 */
 public boolean nextPage() {
 if (isLastPage()) {
  if (!nextChapter()) // 如果已經(jīng)到本書末尾，那么不能繼續(xù)執(zhí)行翻頁代碼
  return false;
 }
 /*
  * Vector<String> lines = new Vector<String>(); charBegin = charEnd;
  * while (lines.size() < lineCount && charEnd < chapterLen) { int i =
  * content.indexOf("\n", charEnd); String paragraphStr =
  * content.substring(charEnd, i); // curCharPos += i; if (charEnd == i)
  * lines.add("");
  * 
  * while (paragraphStr.length() > 0) { int horSize =
  * paint.breakText(paragraphStr, true, visibleWidth, null);
  * lines.add(paragraphStr.substring(0, horSize)); paragraphStr =
  * paragraphStr.substring(horSize); charEnd += horSize; if (lines.size()
  * > lineCount) break; } // 如果是把一整段讀取完的話，需要給當(dāng)前位置加1 if
  * (paragraphStr.length() == 0) charEnd += "\n".length(); } linesVe =
  * lines;
  */
 linesVe = pagesVe.get(++pageNum);
 return true;
 }

 /**
 * 翻到上一頁
 */
 public boolean prePage() {
 if (isFirstPage()) {
  if (!preChapter()) // 如果已經(jīng)到本書第一章，就不能繼續(xù)執(zhí)行翻頁代碼
  return false;
 }
 /*
  * Vector<String> lines = new Vector<String>(); String backStr =
  * content.substring(0, charBegin); charEnd = charBegin;
  * 
  * while (lines.size() < lineCount && charBegin > 0) { int i =
  * backStr.lastIndexOf("\n"); if(i == -1) i = 0; String paragraphStr =
  * backStr.substring(i, charBegin); Vector<String> vet = new
  * Vector<String>(lines);
  * 
  * // if(charBegin == i)lines.add("");
  * 
  * while (paragraphStr.length() > 0) { int horSize =
  * paint.breakText(paragraphStr, true, visibleWidth, null);
  * lines.add(paragraphStr.substring(0, horSize)); paragraphStr =
  * paragraphStr.substring(horSize); charBegin -= horSize; if
  * (lines.size() > lineCount) break; }
  * 
  * backStr = content.substring(0, charBegin); int j = -1; for (String
  * line : vet) lines.insertElementAt(line, ++j); } linesVe = lines;
  */
 linesVe = pagesVe.get(--pageNum);
 return true;
 }

 /**
 * 跳到下一章，若返回值為false，則當(dāng)前章節(jié)已經(jīng)為最后一章
 */
 public boolean nextChapter() {
 int order = chapter.getOrder();
 Chapter tempChapter = IOHelper.getChapter(order + 1);
 if (tempChapter == null)
  return false;
 chapter = tempChapter;
 content = chapter.getContent();
 chapterLen = content.length();
 // curCharPos = 0;
 charBegin = 0;
 charEnd = 0;
 slicePage();
 pageNum = -1;
 return true;
 }

 /**
 * 跳到上一章,若返回值為false，則當(dāng)前章節(jié)已經(jīng)為第一章
 */
 public boolean preChapter() {
 int order = chapter.getOrder();
 Chapter tempChapter = IOHelper.getChapter(order - 1);
 if (tempChapter == null)
  return false;
 chapter = tempChapter;
 content = chapter.getContent();
 chapterLen = content.length();
 // curCharPos = chapterLen;
 charBegin = chapterLen;
 charEnd = chapterLen;
 slicePage();
 pageNum = pagesVe.size();
 return true;
 }

 public boolean isFirstPage() {
 if (pageNum <= 0)
  return true;
 return false;
 }

 public boolean isLastPage() {
 if (pageNum >= pagesVe.size() - 1)
  return true;
 return false;
 }

 public void draw(Canvas c) {
 if (linesVe.size() == 0)
  nextPage();
 if (linesVe.size() > 0) {
  if (bgBitmap == null)
  c.drawColor(bgColor);
  else
  c.drawBitmap(bgBitmap, 0, 0, null);

  int y = marginHeight;
  for (String line : linesVe) {
  y += lineHgight;
  c.drawText(line, marginWidth, y, paint);
  }
 }

 // float percent = (float) (charBegin * 1.0 / chapterLen);
 float percent = (float) ((pageNum + 1) * 1.0 / pagesVe.size());
 DecimalFormat df = new DecimalFormat("#0.0");
 String percetStr = df.format(percent * 100) + "%";

 Time time = new Time();
 time.setToNow();
 String timeStr;
 if (time.minute < 10)
  timeStr = "" + time.hour + " : 0" + time.minute;
 else
  timeStr = "" + time.hour + " : " + time.minute;

 int pSWidth = (int) paintBottom.measureText("99.9%") + 2;
 int titWidth = (int) paintBottom.measureText(chapter.getTitle());

 
 c.drawText(timeStr, marginWidth / 2, screenHeight - 5, paintBottom);
 c.drawText(chapter.getTitle(), screenWidth / 2 - titWidth / 2,
  screenHeight - 5, paintBottom);
 c.drawText(percetStr, screenWidth - pSWidth, screenHeight - 5, paintBottom);
 }

 public void setBgBitmap(Bitmap bMap) {
 bgBitmap = Bitmap.createScaledBitmap(bMap, screenWidth, screenHeight,
  true);
 }

}

package com.horse.bean;
/**
 * 章節(jié)信息，包括標(biāo)題和內(nèi)容，及順序
 * @author MJZ
 *
 */
public class Chapter { 
 private String title;
 private String content;
 private int order;
 
 public String getTitle() {
 return title;
 }
 public void setTitle(String title) {
 this.title = title;
 }
 public String getContent() {
 return content;
 }
 public void setContent(String content) {
 this.content = content;
 }
 public int getOrder() {
 return order;
 }
 public void setOrder(int order) {
 this.order = order;
 }
 
 
}