// Copyright (C) 2016 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.google.reviewit;

import android.os.Bundle;
import android.support.annotation.LayoutRes;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;

import com.google.reviewit.app.Change;
import com.google.reviewit.widget.ChangeEntry;
import com.google.reviewit.widget.SlidingTabLayout;

import java.util.ArrayList;
import java.util.List;

import static com.google.common.base.Preconditions.checkArgument;

public class PagedChangeDetailsFragment extends BaseFragment {

  @Override
  protected @LayoutRes
  int getLayout() {
    return R.layout.content_paged_change_details;
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    ((MainActivity) getActivity()).getSupportActionBar().hide();

    init();
  }

  private void init() {
    Change change = getApp().getQueryHandler().getCurrentChange();
    checkArgument(change != null, "No change to display");

    ChangeEntry changeEntry = new ChangeEntry(getContext());
    changeEntry.init(getApp(), change);
    vg(R.id.changeHeader).addView(changeEntry);

    final List<PageFragment> fragments = new ArrayList<>();

    CommitMessageFragment commitMessageFragment = new CommitMessageFragment();
    commitMessageFragment.setChange(change);
    fragments.add(commitMessageFragment);

    FileListFragment fileListFragment = new FileListFragment();
    fileListFragment.setChange(change);
    fragments.add(fileListFragment);

    // TODO add more tabs, e.g. for change messages, approvals and post review

    ViewPager pager = ((ViewPager) v(R.id.pager));
    pager.setAdapter(
        new FragmentPagerAdapter(getChildFragmentManager()) {
          @Override
          public Fragment getItem(int position) {
            return fragments.get(position);
          }

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

          @Override
          public CharSequence getPageTitle(int position) {
            return getString(fragments.get(position).getTitle());
          }
        });

    SlidingTabLayout tabs = ((SlidingTabLayout) v(R.id.tabs));
    tabs.setSelectedIndicatorColors(widgetUtil.color(R.color.tab));
    tabs.setDividerColors(widgetUtil.color(R.color.tabDivider));
    tabs.setViewPager(pager);
  }
}