/* Copyright 2017 Andrew Dawson
 *
 * This file is a part of Tusky.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Tusky; if not,
 * see <http://www.gnu.org/licenses>. */

package com.keylesspalace.tusky.fragment;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


import com.keylesspalace.tusky.adapter.ThreadAdapter;
import com.keylesspalace.tusky.BaseActivity;
import com.keylesspalace.tusky.entity.Status;
import com.keylesspalace.tusky.entity.StatusContext;
import com.keylesspalace.tusky.network.MastodonApi;
import com.keylesspalace.tusky.R;
import com.keylesspalace.tusky.interfaces.StatusActionListener;
import com.keylesspalace.tusky.receiver.TimelineReceiver;
import com.keylesspalace.tusky.util.ThemeUtils;
import com.keylesspalace.tusky.view.ConversationLineItemDecoration;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class ViewThreadFragment extends SFragment implements
        SwipeRefreshLayout.OnRefreshListener, StatusActionListener {
    private static final String TAG = "ViewThreadFragment";

    private SwipeRefreshLayout swipeRefreshLayout;
    private RecyclerView recyclerView;
    private ThreadAdapter adapter;
    private MastodonApi mastodonApi;
    private String thisThreadsStatusId;
    private TimelineReceiver timelineReceiver;

    public static ViewThreadFragment newInstance(String id) {
        Bundle arguments = new Bundle();
        ViewThreadFragment fragment = new ViewThreadFragment();
        arguments.putString("id", id);
        fragment.setArguments(arguments);
        return fragment;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_view_thread, container, false);

        Context context = getContext();
        swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout);
        swipeRefreshLayout.setOnRefreshListener(this);

        recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager layoutManager = new LinearLayoutManager(context);
        recyclerView.setLayoutManager(layoutManager);
        DividerItemDecoration divider = new DividerItemDecoration(
                context, layoutManager.getOrientation());
        Drawable drawable = ThemeUtils.getDrawable(context, R.attr.status_divider_drawable,
                R.drawable.status_divider_dark);
        divider.setDrawable(drawable);
        recyclerView.addItemDecoration(divider);
        recyclerView.addItemDecoration(new ConversationLineItemDecoration(context,
                ContextCompat.getDrawable(context, R.drawable.conversation_divider_dark)));
        adapter = new ThreadAdapter(this);
        recyclerView.setAdapter(adapter);

        mastodonApi = null;
        thisThreadsStatusId = null;

        timelineReceiver = new TimelineReceiver(adapter, this);
        LocalBroadcastManager.getInstance(context.getApplicationContext())
                .registerReceiver(timelineReceiver, TimelineReceiver.getFilter(null));

        return rootView;
    }

    @Override
    public void onDestroyView() {
        LocalBroadcastManager.getInstance(getContext())
                .unregisterReceiver(timelineReceiver);
        super.onDestroyView();
    }

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

        /* BaseActivity's MastodonApi object isn't guaranteed to be valid until after its onCreate
         * is run, so all calls that need it can't be done until here. */
        mastodonApi = ((BaseActivity) getActivity()).mastodonApi;

        thisThreadsStatusId = getArguments().getString("id");
        onRefresh();
    }

    private void sendStatusRequest(final String id) {
        Call<Status> call = mastodonApi.status(id);
        call.enqueue(new Callback<Status>() {
            @Override
            public void onResponse(Call<Status> call, Response<Status> response) {
                if (response.isSuccessful()) {
                    int position = adapter.setStatus(response.body());
                    recyclerView.scrollToPosition(position);
                } else {
                    onThreadRequestFailure(id);
                }
            }

            @Override
            public void onFailure(Call<Status> call, Throwable t) {
                onThreadRequestFailure(id);
            }
        });
        callList.add(call);
    }

    private void sendThreadRequest(final String id) {
        Call<StatusContext> call = mastodonApi.statusContext(id);
        call.enqueue(new Callback<StatusContext>() {
            @Override
            public void onResponse(Call<StatusContext> call, Response<StatusContext> response) {
                if (response.isSuccessful()) {
                    swipeRefreshLayout.setRefreshing(false);
                    StatusContext context = response.body();

                    adapter.setContext(context.ancestors, context.descendants);
                } else {
                    onThreadRequestFailure(id);
                }
            }

            @Override
            public void onFailure(Call<StatusContext> call, Throwable t) {
                onThreadRequestFailure(id);
            }
        });
        callList.add(call);
    }

    private void onThreadRequestFailure(final String id) {
        View view = getView();
        swipeRefreshLayout.setRefreshing(false);
        if (view != null) {
            Snackbar.make(view, R.string.error_generic, Snackbar.LENGTH_LONG)
                    .setAction(R.string.action_retry, new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            sendThreadRequest(id);
                            sendStatusRequest(id);
                        }
                    })
                    .show();
        } else {
            Log.e(TAG, "Couldn't display thread fetch error message");
        }
    }

    @Override
    public void onRefresh() {
        sendStatusRequest(thisThreadsStatusId);
        sendThreadRequest(thisThreadsStatusId);
    }

    @Override
    public void onReply(int position) {
        super.reply(adapter.getItem(position));
    }

    @Override
    public void onReblog(boolean reblog, int position) {
        super.reblog(adapter.getItem(position), reblog, adapter, position);
    }

    @Override
    public void onFavourite(boolean favourite, int position) {
        super.favourite(adapter.getItem(position), favourite, adapter, position);
    }

    @Override
    public void onMore(View view, int position) {
        super.more(adapter.getItem(position), view, adapter, position);
    }

    @Override
    public void onViewMedia(String[] urls, int urlIndex, Status.MediaAttachment.Type type) {
        super.viewMedia(urls, urlIndex, type);
    }

    @Override
    public void onViewThread(int position) {
        Status status = adapter.getItem(position);
        if (thisThreadsStatusId.equals(status.id)) {
            // If already viewing this thread, don't reopen it.
            return;
        }
        super.viewThread(status);
    }

    @Override
    public void onViewTag(String tag) {
        super.viewTag(tag);
    }

    @Override
    public void onViewAccount(String id) {
        super.viewAccount(id);
    }
}