/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.replica.replicaisland;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.os.SystemClock;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.replica.replicaisland.ConversationUtils.Conversation;
import com.replica.replicaisland.ConversationUtils.ConversationPage;

public class ConversationDialogActivity extends Activity {

    private final static float TEXT_CHARACTER_DELAY = 0.1f;
    private final static int TEXT_CHARACTER_DELAY_MS = (int)(TEXT_CHARACTER_DELAY * 1000);
    private ConversationUtils.Conversation mConversation;
    private ArrayList<ConversationUtils.ConversationPage> mPages;
    private int mCurrentPage;
    
    private ImageView mOkArrow;
    private AnimationDrawable mOkAnimation;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.conversation_dialog);
        
        mOkArrow = (ImageView)findViewById(R.id.ok);
        mOkArrow.setBackgroundResource(R.anim.ui_button);
		mOkAnimation = (AnimationDrawable) mOkArrow.getBackground();
		mOkArrow.setVisibility(View.INVISIBLE);
        
        final Intent callingIntent = getIntent();
        final int levelRow = callingIntent.getIntExtra("levelRow", -1);
        final int levelIndex = callingIntent.getIntExtra("levelIndex", -1);
        final int index = callingIntent.getIntExtra("index", -1);
        final int character = callingIntent.getIntExtra("character", 1);
        
        mPages = null;
        
        // LevelTree.get(mLevelRow, mLevelIndex).dialogResources.character2Entry.get(index)
        if (levelRow != -1 && levelIndex != -1 && index != -1) {
        	if (character == 1) {
        		mConversation = LevelTree.get(levelRow, levelIndex).dialogResources.character1Conversations.get(index);
        	} else {
        		mConversation = LevelTree.get(levelRow, levelIndex).dialogResources.character2Conversations.get(index);
        	}
        	TypewriterTextView tv = (TypewriterTextView)findViewById(R.id.typewritertext);   
        	tv.setParentActivity(this);
        	
        } else {
        	// bail
        	finish();
        }
    }
    
    private void formatPages(Conversation conversation, TextView textView) {
		Paint paint = new Paint();
        final int maxWidth = textView.getWidth();
        final int maxHeight = textView.getHeight();
        paint.setTextSize(textView.getTextSize());
        paint.setTypeface(textView.getTypeface());
        
        for (int page = conversation.pages.size() - 1; page >= 0 ; page--) {
        	ConversationUtils.ConversationPage currentPage = conversation.pages.get(page);
        	CharSequence text = currentPage.text;
        	// Iterate line by line through the text.  Add \n if it gets too wide,
        	// and split into a new page if it gets too long.
        	int currentOffset = 0;
        	int textLength = text.length();
        	SpannableStringBuilder spannedText = new SpannableStringBuilder(text);
        	int lineCount = 0;
        	final float fontHeight = -paint.ascent() + paint.descent();
        	final int maxLinesPerPage = (int)(maxHeight / fontHeight);
        	CharSequence newline = "\n";
        	int addedPages = 0;
        	int lastPageStart = 0;
        	do {
	        	int fittingChars = paint.breakText(text, currentOffset, textLength, true, maxWidth, null);
	        	
	        	if (currentOffset + fittingChars < textLength) {
	        		fittingChars -= 2;
	        		// Text doesn't fit on the line.  Insert a return after the last space.
	        		int lastSpace = TextUtils.lastIndexOf(text, ' ', currentOffset + fittingChars - 1);
	        		if (lastSpace == -1) {
	        			// No spaces, just split at the last character.
	        			lastSpace = currentOffset + fittingChars - 1;
	        		}
	        		spannedText.replace(lastSpace, lastSpace + 1, newline, 0, 1);
	        		lineCount++;
	        		currentOffset = lastSpace + 1;
	        	} else {
	        		lineCount++;
	        		currentOffset = textLength;
	        	}
	        	
	        	if (lineCount >= maxLinesPerPage || currentOffset >= textLength) {
        			lineCount = 0;
        			if (addedPages == 0) {
        				// overwrite the original page
        				currentPage.text = spannedText.subSequence(lastPageStart, currentOffset);
        			} else {
        				// split into a new page
	        			ConversationPage newPage = new ConversationPage();
		                newPage.imageResource = currentPage.imageResource;
		                newPage.text = spannedText.subSequence(lastPageStart, currentOffset);
		                newPage.title = currentPage.title;
		                conversation.pages.add(page + addedPages, newPage);
        			}
        			lastPageStart = currentOffset;
        			addedPages++;
        		}
        	} while (currentOffset < textLength);
        	
        	
        }
        
        // Holy crap we did a lot of allocation there.
        Runtime.getRuntime().gc();
	}

	@Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            TypewriterTextView tv = (TypewriterTextView)findViewById(R.id.typewritertext);        
            
            if (tv.getRemainingTime() > 0) {
                tv.snapToEnd();
            } else {
                mCurrentPage++;
                if (mCurrentPage < mPages.size()) {
                    showPage(mPages.get(mCurrentPage));
                } else {
                    finish();
                }
            }
        }
        // Sleep so that the main thread doesn't get flooded with UI events.
        try {
            Thread.sleep(32);
        } catch (InterruptedException e) {
            // No big deal if this sleep is interrupted.
        }
        return true;
    }
    
    protected void showPage(ConversationUtils.ConversationPage page) {
        TypewriterTextView tv = (TypewriterTextView)findViewById(R.id.typewritertext);        
        tv.setTypewriterText(page.text);
        
		mOkArrow.setVisibility(View.INVISIBLE);
		mOkAnimation.start();

		tv.setOkArrow(mOkArrow);
		
        ImageView image = (ImageView)findViewById(R.id.speaker);
        if (page.imageResource != 0) {
        	image.setImageResource(page.imageResource);
        	image.setVisibility(View.VISIBLE);
        } else {
        	image.setVisibility(View.GONE);
        }
        
        TextView title = (TextView)findViewById(R.id.speakername);
        if (page.title != null) {
            title.setText(page.title);
            title.setVisibility(View.VISIBLE);
        } else {
        	title.setVisibility(View.GONE);
        }
        
    }
    
    public void processText() {
    	if (!mConversation.splittingComplete) {
    		TextView textView = (TextView)findViewById(R.id.typewritertext);
    		formatPages(mConversation, textView);
    		mConversation.splittingComplete = true;
    	}
    	
    	if (mPages == null) {
	    	mPages = mConversation.pages;
	        showPage(mPages.get(0));
	        
	        mCurrentPage = 0;
    	}
    }
    
    
    public static class TypewriterTextView extends TextView {
        private int mCurrentCharacter;
        private long mLastTime;
        private CharSequence mText;
        private View mOkArrow;
        private ConversationDialogActivity mParentActivity;  // This really sucks.
        
        public TypewriterTextView(Context context) {
            super(context);
        }
        
        public TypewriterTextView(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
        
        public TypewriterTextView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
        }
        
        public void setParentActivity(ConversationDialogActivity parent) {
        	mParentActivity = parent;
        }
        
        public void setTypewriterText(CharSequence text) {
            mText = text;
            mCurrentCharacter = 0;
            mLastTime = 0;
            postInvalidate();
        }
        
        public long getRemainingTime() {
            return (mText.length() - mCurrentCharacter) * TEXT_CHARACTER_DELAY_MS;
        }
        
        public void snapToEnd() {
            mCurrentCharacter = mText.length() - 1; 
        }
        
        public void setOkArrow(View arrow) {
        	mOkArrow = arrow;
        }
        
        
		@Override
		protected void onSizeChanged(int w, int h, int oldw, int oldh) {
			// We need to wait until layout has occurred before we can setup the
			// text page.  Ugh.  Bidirectional dependency!  
			if (mParentActivity != null) {
				mParentActivity.processText();
			}
			super.onSizeChanged(w, h, oldw, oldh);
		}

		@Override
        public void onDraw(Canvas canvas) {
            final long time = SystemClock.uptimeMillis();
            final long delta = time - mLastTime;
            if (delta > TEXT_CHARACTER_DELAY_MS) {
                if (mText != null) {
                    if (mCurrentCharacter <= mText.length()) {
                        CharSequence subtext = mText.subSequence(0, mCurrentCharacter);
                        setText(subtext, TextView.BufferType.SPANNABLE);
                        mCurrentCharacter++;
                        postInvalidateDelayed(TEXT_CHARACTER_DELAY_MS);
                    } else {
                    	if (mOkArrow != null) {
                    		mOkArrow.setVisibility(View.VISIBLE);
                    	}
                    }
                }
            }
            super.onDraw(canvas);
        }
    }
    
    

}