/*
 * Copyright 2014 Ankush Sachdeva
 *
 * 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 github.ankushsachdeva.emojicon;

import github.ankushsachdeva.emojicon.EmojiconGridView.OnEmojiconClickedListener;
import github.ankushsachdeva.emojicon.emoji.Emojicon;
import github.ankushsachdeva.emojicon.emoji.Nature;
import github.ankushsachdeva.emojicon.emoji.Objects;
import github.ankushsachdeva.emojicon.emoji.People;
import github.ankushsachdeva.emojicon.emoji.Places;
import github.ankushsachdeva.emojicon.emoji.Symbols;

import java.util.Arrays;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager.LayoutParams;
import android.widget.EditText;
import android.widget.PopupWindow;

import github.ankushsachdeva.emojicon.R;


/**
 * @author Ankush Sachdeva (sankush@yahoo.co.in).
 */

public class EmojiconsPopup extends PopupWindow implements ViewPager.OnPageChangeListener, EmojiconRecents {
	private int mEmojiTabLastSelectedIndex = -1;
	private View[] mEmojiTabs;
	private PagerAdapter mEmojisAdapter;
	private EmojiconRecentsManager mRecentsManager;
	private int keyBoardHeight = 0;
	private Boolean isOpened = false;
	OnEmojiconClickedListener onEmojiconClickedListener;
	OnEmojiconBackspaceClickedListener onEmojiconBackspaceClickedListener; 
	OnSoftKeyboardOpenCloseListener onSoftKeyboardOpenCloseListener;
	View rootView;
	Context mContext;
	
	public ViewPager emojisPager;
	
	public EmojiconsPopup(View rootView, Context mContext){
		super(mContext);
		this.mContext = mContext;
		this.rootView = rootView;
		View customView = createCustomView();
		setContentView(customView);
		
		setSoftInputMode(LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
		//default size 
		setSize((int) mContext.getResources().getDimension(R.dimen.keyboard_height), LayoutParams.MATCH_PARENT);
	}
	
	public void setOnSoftKeyboardOpenCloseListener(OnSoftKeyboardOpenCloseListener listener){
		this.onSoftKeyboardOpenCloseListener = listener; 
	}
	
	public void setOnEmojiconClickedListener(OnEmojiconClickedListener listener){
		this.onEmojiconClickedListener = listener;
	}
	
	public void setOnEmojiconBackspaceClickedListener(OnEmojiconBackspaceClickedListener listener){
		this.onEmojiconBackspaceClickedListener = listener;
	}
	
	public void showAtBottom(){
		showAtLocation(rootView, Gravity.BOTTOM, 0, 0);
	}
	
	public Boolean isKeyBoardOpen(){
		return isOpened;
	}
	
	public void setSizeForSoftKeyboard(){
		rootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
	        @Override
	        public void onGlobalLayout() {
        	     Rect r = new Rect();
        	     rootView.getWindowVisibleDisplayFrame(r);

                 int screenHeight = rootView.getRootView()
                         .getHeight();
                 int heightDifference = screenHeight
                         - (r.bottom - r.top);
                 int resourceId = mContext.getResources()
                         .getIdentifier("status_bar_height",
                                 "dimen", "android");
                 if (resourceId > 0) {
                     heightDifference -= mContext.getResources()
                             .getDimensionPixelSize(resourceId);
                 }
                 if (heightDifference > 100) {
                	 keyBoardHeight = heightDifference;
                	 setSize(LayoutParams.MATCH_PARENT, keyBoardHeight);
                	 if(isOpened == false){
 	                    if(onSoftKeyboardOpenCloseListener!=null)
 	                    	onSoftKeyboardOpenCloseListener.onKeyboardOpen(keyBoardHeight);
 	                }
                	isOpened = true;
                 }
                 else{
                	 isOpened = false;
                	 if(onSoftKeyboardOpenCloseListener!=null)
	                    	onSoftKeyboardOpenCloseListener.onKeyboardClose();
                 }
	         }
	    });
	}
	
	public void setSize(int width, int height){
		setWidth(width);
		setHeight(height);
	}
	
	public View createCustomView() {
		LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
		View view = inflater.inflate(R.layout.emojicons, null, false);
		emojisPager = (ViewPager) view.findViewById(R.id.emojis_pager);
		emojisPager.setOnPageChangeListener(this);
		EmojiconRecents recents = this;
		mEmojisAdapter = new EmojisPagerAdapter(
		Arrays.asList(
				new EmojiconRecentsGridView(mContext, null, null, this),
				new EmojiconGridView(mContext, People.DATA, recents, this),
				new EmojiconGridView(mContext, Nature.DATA, recents, this),
				new EmojiconGridView(mContext, Objects.DATA, recents, this),
				new EmojiconGridView(mContext, Places.DATA, recents, this),
				new EmojiconGridView(mContext, Symbols.DATA, recents, this)
				)
			);
		emojisPager.setAdapter(mEmojisAdapter);
		mEmojiTabs = new View[6];
		mEmojiTabs[0] = view.findViewById(R.id.emojis_tab_0_recents);
		mEmojiTabs[1] = view.findViewById(R.id.emojis_tab_1_people);
		mEmojiTabs[2] = view.findViewById(R.id.emojis_tab_2_nature);
		mEmojiTabs[3] = view.findViewById(R.id.emojis_tab_3_objects);
		mEmojiTabs[4] = view.findViewById(R.id.emojis_tab_4_cars);
		mEmojiTabs[5] = view.findViewById(R.id.emojis_tab_5_punctuation);
		for (int i = 0; i < mEmojiTabs.length; i++) {
			final int position = i;
			mEmojiTabs[i].setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					emojisPager.setCurrentItem(position);
				}
			});
		}
		view.findViewById(R.id.emojis_backspace).setOnTouchListener(new RepeatListener(1000, 50, new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				if(onEmojiconBackspaceClickedListener != null)
					onEmojiconBackspaceClickedListener.onEmojiconBackspaceClicked(v);
			}
		}));

		// get last selected page
		mRecentsManager = EmojiconRecentsManager.getInstance(view.getContext());
		int page = mRecentsManager.getRecentPage();
		// last page was recents, check if there are recents to use
		// if none was found, go to page 1
		if (page == 0 && mRecentsManager.size() == 0) {
			page = 1;
		}

		if (page == 0) {
			onPageSelected(page);
		}
		else {
			emojisPager.setCurrentItem(page, false);
		}
		return view;
	}

	public static void input(EditText editText, Emojicon emojicon) {
		if (editText == null || emojicon == null) {
			return;
		}

		int start = editText.getSelectionStart();
		int end = editText.getSelectionEnd();
		if (start < 0) {
			editText.append(emojicon.getEmoji());
		} else {
			editText.getText().replace(Math.min(start, end), Math.max(start, end), emojicon.getEmoji(), 0, emojicon.getEmoji().length());
		}
	}

	@Override
	public void addRecentEmoji(Context context, Emojicon emojicon) {
		EmojiconRecentsGridView fragment = ((EmojisPagerAdapter)emojisPager.getAdapter()).getRecentFragment();
		fragment.addRecentEmoji(context, emojicon);
	}

	public static void backspace(EditText editText) {
		KeyEvent event = new KeyEvent(0, 0, 0, KeyEvent.KEYCODE_DEL, 0, 0, 0, 0, KeyEvent.KEYCODE_ENDCALL);
		editText.dispatchKeyEvent(event);
	}

	@Override
	public void onPageScrolled(int i, float v, int i2) {
	}

	@Override
	public void onPageSelected(int i) {
		if (mEmojiTabLastSelectedIndex == i) {
			return;
		}
		switch (i) {
		case 0:
		case 1:
		case 2:
		case 3:
		case 4:
		case 5:
			if (mEmojiTabLastSelectedIndex >= 0 && mEmojiTabLastSelectedIndex < mEmojiTabs.length) {
				mEmojiTabs[mEmojiTabLastSelectedIndex].setSelected(false);
			}
			mEmojiTabs[i].setSelected(true);
			mEmojiTabLastSelectedIndex = i;
			mRecentsManager.setRecentPage(i);
			break;
		}
	}

	@Override
	public void onPageScrollStateChanged(int i) {
	}

	private static class EmojisPagerAdapter extends PagerAdapter {
		private List<EmojiconGridView> views;
		public EmojiconRecentsGridView getRecentFragment(){
			for (EmojiconGridView it : views) {
				if(it instanceof EmojiconRecentsGridView)
					return (EmojiconRecentsGridView)it;
			}
			return null;
		}
		public EmojisPagerAdapter(List<EmojiconGridView> views) {
			super();
			this.views = views;
		}

		@Override
		public int getCount() {
			return views.size();
		}
		
		
		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			View v = views.get(position).rootView;
			((ViewPager)container).addView(v, 0);
			return v;
		}
		
		@Override
		public void destroyItem(ViewGroup container, int position, Object view) {
			((ViewPager)container).removeView((View)view);
		}
		
		@Override
		public boolean isViewFromObject(View view, Object key) {
			return key == view;
		}
	}

	/**
	 * A class, that can be used as a TouchListener on any view (e.g. a Button).
	 * It cyclically runs a clickListener, emulating keyboard-like behaviour. First
	 * click is fired immediately, next before initialInterval, and subsequent before
	 * normalInterval.
	 * <p/>
	 * <p>Interval is scheduled before the onClick completes, so it has to run fast.
	 * If it runs slow, it does not generate skipped onClicks.
	 */
	public static class RepeatListener implements View.OnTouchListener {

		private Handler handler = new Handler();

		private int initialInterval;
		private final int normalInterval;
		private final View.OnClickListener clickListener;

		private Runnable handlerRunnable = new Runnable() {
			@Override
			public void run() {
				if (downView == null) {
					return;
				}
				handler.removeCallbacksAndMessages(downView);
				handler.postAtTime(this, downView, SystemClock.uptimeMillis() + normalInterval);
				clickListener.onClick(downView);
			}
		};

		private View downView;

		/**
		 * @param initialInterval The interval before first click event
		 * @param normalInterval  The interval before second and subsequent click
		 *                        events
		 * @param clickListener   The OnClickListener, that will be called
		 *                        periodically
		 */
		public RepeatListener(int initialInterval, int normalInterval, View.OnClickListener clickListener) {
			if (clickListener == null)
				throw new IllegalArgumentException("null runnable");
			if (initialInterval < 0 || normalInterval < 0)
				throw new IllegalArgumentException("negative interval");

			this.initialInterval = initialInterval;
			this.normalInterval = normalInterval;
			this.clickListener = clickListener;
		}

		public boolean onTouch(View view, MotionEvent motionEvent) {
			switch (motionEvent.getAction()) {
			case MotionEvent.ACTION_DOWN:
				downView = view;
				handler.removeCallbacks(handlerRunnable);
				handler.postAtTime(handlerRunnable, downView, SystemClock.uptimeMillis() + initialInterval);
				clickListener.onClick(view);
				return true;
			case MotionEvent.ACTION_UP:
			case MotionEvent.ACTION_CANCEL:
			case MotionEvent.ACTION_OUTSIDE:
				handler.removeCallbacksAndMessages(downView);
				downView = null;
				return true;
			}
			return false;
		}
	}

	public interface OnEmojiconBackspaceClickedListener {
		void onEmojiconBackspaceClicked(View v);
	}
	
	public interface OnSoftKeyboardOpenCloseListener{
		void onKeyboardOpen(int keyBoardHeight);
		void onKeyboardClose();
	}
}