/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.goanna.firstrun;

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.AnimatorSet;
import com.nineoldandroids.animation.ObjectAnimator;
import com.nineoldandroids.view.ViewHelper;
import org.mozilla.goanna.animation.TransitionsTracker;

import java.util.List;

public class FirstrunPager extends ViewPager {
    private Context context;
    protected FirstrunPane.OnFinishListener listener;

    public FirstrunPager(Context context) {
        this(context, null);
    }

    public FirstrunPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
    }

    public void load(FragmentManager fm, FirstrunPane.OnFinishListener listener) {
        setAdapter(new ViewPagerAdapter(fm, FirstrunPagerConfig.getDefault()));
        this.listener = listener;

        animateLoad();
    }

    public void hide() {
        setAdapter(null);
    }

    private void animateLoad() {
        ViewHelper.setTranslationY(this, 500);
        ViewHelper.setAlpha(this, 0);

        final Animator translateAnimator = ObjectAnimator.ofFloat(this, "translationY", 0);
        translateAnimator.setDuration(400);

        final Animator alphaAnimator = ObjectAnimator.ofFloat(this, "alpha", 1);
        alphaAnimator.setStartDelay(200);
        alphaAnimator.setDuration(600);

        final AnimatorSet set = new AnimatorSet();
        set.playTogether(alphaAnimator, translateAnimator);
        set.setStartDelay(400);
        TransitionsTracker.track(set);

        set.start();
    }

    private class ViewPagerAdapter extends FragmentPagerAdapter {
        private List<FirstrunPagerConfig.FirstrunPanel> panels;

        public ViewPagerAdapter(FragmentManager fm, List<FirstrunPagerConfig.FirstrunPanel> panels) {
            super(fm);
            this.panels = panels;
        }

        @Override
        public Fragment getItem(int i) {
            final Fragment fragment = Fragment.instantiate(context, panels.get(i).getClassname());
            ((FirstrunPanel) fragment).setOnFinishListener(listener);
            return fragment;
        }

        @Override
        public int getCount() {
            return panels.size();
        }

        @Override
        public CharSequence getPageTitle(int i) {
            return context.getString(panels.get(i).getTitleRes()).toUpperCase();
        }
    }
}