package com.dougkeen.bart.controls;

import org.apache.commons.lang3.StringUtils;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.TextSwitcher;

import com.dougkeen.bart.model.TextProvider;

public class TimedTextSwitcher extends TextSwitcher implements
		Ticker.TickSubscriber {

	public TimedTextSwitcher(Context context, AttributeSet attrs) {
		super(context, attrs);
		setInstanceVarsFromAttrs(attrs);
	}

	public TimedTextSwitcher(Context context) {
		super(context);
	}

	private void setInstanceVarsFromAttrs(AttributeSet attrs) {
		int tickInterval = attrs.getAttributeIntValue(
				"http://schemas.android.com/apk/res/com.dougkeen.bart",
				"tickInterval", 0);
		if (tickInterval > 0) {
			setTickInterval(tickInterval);
		}
	}

	private int mTickInterval;
	private TextProvider mTextProvider;

	@Override
	public int getTickInterval() {
		return mTickInterval;
	}

	public void setTickInterval(int tickInterval) {
		this.mTickInterval = tickInterval;
	}

	public void setTextProvider(TextProvider textProvider) {
		mTextProvider = textProvider;
		Ticker.getInstance().addSubscriber(this, getContext());
	}

	private CharSequence mLastText;

	@Override
	public void setCurrentText(CharSequence text) {
		mLastText = text;
		super.setCurrentText(text);
	}

	@Override
	public void onTick(long tickNumber) {
		String text = mTextProvider.getText(tickNumber);
		if (StringUtils.isNotBlank(text)
				&& !StringUtils.equalsIgnoreCase(text, mLastText)) {
			mLastText = text;
			setText(text);
		}
	}

}