/**
 * Copyright (c) 2013, Redsolution LTD. All rights reserved.
 *
 * This file is part of Xabber project; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License, Version 3.
 *
 * Xabber 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 this program. If not, see http://www.gnu.org/licenses/.
 */
package com.xabber.android.ui.adapter;

import android.app.Activity;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.CharacterStyle;
import android.text.style.TextAppearanceSpan;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.xabber.android.data.SettingsManager;
import com.xabber.android.data.SettingsManager.ChatsDivide;
import com.xabber.android.data.account.AccountItem;
import com.xabber.android.data.account.AccountManager;
import com.xabber.android.data.extension.avatar.AvatarManager;
import com.xabber.android.data.extension.muc.MUCManager;
import com.xabber.android.data.extension.muc.RoomContact;
import com.xabber.android.data.message.ChatAction;
import com.xabber.android.data.message.MessageItem;
import com.xabber.android.data.message.MessageManager;
import com.xabber.android.data.roster.AbstractContact;
import com.xabber.android.data.roster.RosterManager;
import com.xabber.android.utils.StringUtils;
import com.xabber.androiddev.R;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;

/**
 * Adapter for the list of messages in the chat.
 *
 * @author alexander.ivanov
 */
public class ChatMessageAdapter extends BaseAdapter implements UpdatableAdapter {

    private static final int VIEW_TYPE_COUNT = 5;

    private static final int VIEW_TYPE_EMPTY = 0;
    private static final int VIEW_TYPE_HINT = 1;
    public static final int VIEW_TYPE_INCOMING_MESSAGE = 2;
    public static final int VIEW_TYPE_OUTGOING_MESSAGE = 3;
    private static final int VIEW_TYPE_ACTION_MESSAGE = 4;

    private final Activity activity;
    private String account;
    private String user;
    private boolean isMUC;
    private List<MessageItem> messages;

    /**
     * Message font appearance.
     */
    private final int appearanceStyle;

    /**
     * Divider between header and body.
     */
    private final String divider;

    /**
     * Text with extra information.
     */
    private String hint;

    public ChatMessageAdapter(Activity activity, String account, String user) {
        this.activity = activity;
        messages = Collections.emptyList();
        this.account = account;
        this.user = user;
        isMUC = MUCManager.getInstance().hasRoom(account, user);
        hint = null;
        appearanceStyle = SettingsManager.chatsAppearanceStyle();
        ChatsDivide chatsDivide = SettingsManager.chatsDivide();
        if (chatsDivide == ChatsDivide.always || (chatsDivide == ChatsDivide.portial
                && !activity.getResources().getBoolean(R.bool.landscape))) {
            divider = "\n";
        } else {
            divider = " ";
        }
    }

    @Override
    public int getCount() {
        return messages.size() + 1;
    }

    @Override
    public Object getItem(int position) {
        if (position < messages.size()) {
            return messages.get(position);
        } else {
            return null;
        }
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        return VIEW_TYPE_COUNT;
    }

    @Override
    public int getItemViewType(int position) {
        if (position >= messages.size()) {
            return hint == null ? VIEW_TYPE_EMPTY : VIEW_TYPE_HINT;
        }

        MessageItem messageItem = (MessageItem) getItem(position);
        if (messageItem.getAction() != null) {
            return VIEW_TYPE_ACTION_MESSAGE;
        }

        return messageItem.isIncoming() ? VIEW_TYPE_INCOMING_MESSAGE : VIEW_TYPE_OUTGOING_MESSAGE;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final int type = getItemViewType(position);

        if (type == VIEW_TYPE_EMPTY) {
            if (convertView == null) {
                return activity.getLayoutInflater().inflate(R.layout.chat_viewer_empty, parent, false);
            } else {
                return convertView;
            }
        }

        if (type == VIEW_TYPE_HINT) {
            View view = convertView;
            if (convertView == null) {
                view = activity.getLayoutInflater().inflate(R.layout.chat_viewer_info, parent, false);
            }

            TextView textView = ((TextView) view.findViewById(R.id.info));
            textView.setText(hint);
            textView.setTextAppearance(activity, R.style.ChatInfo_Warning);
            return view;
        }

        MessageItem messageItem = (MessageItem) getItem(position);

        if (type == VIEW_TYPE_ACTION_MESSAGE) {
            View view = convertView;
            if (convertView == null) {
                view = activity.getLayoutInflater().inflate(R.layout.chat_viewer_action_message, parent, false);
            }

            ChatAction action = messageItem.getAction();

            String time = StringUtils.getSmartTimeText(activity, messageItem.getTimestamp());

            ((TextView)view.findViewById(R.id.action_message_text)).setText(time + ": "
                    + action.getText(activity, messageItem.getResource(), messageItem.getSpannable().toString()));

            return view;
        }

        View view = convertView;

        if (convertView == null) {
            final int layoutId;

            if (type == VIEW_TYPE_INCOMING_MESSAGE) {
                layoutId = R.layout.chat_viewer_incoming_message;
            } else if (type == VIEW_TYPE_OUTGOING_MESSAGE) {
                layoutId = R.layout.chat_viewer_outgoing_message;
            } else {
                throw new IllegalStateException();
            }

            view = activity.getLayoutInflater().inflate(layoutId, parent, false);
        }

        setUpMessageView(messageItem, view);
        return view;
    }

    private void setUpMessageView(MessageItem messageItem, View view) {
        final boolean incoming = messageItem.isIncoming();


        SpannableStringBuilder builder = new SpannableStringBuilder();
        final String resource = messageItem.getResource();

        if (!incoming) {
            setStatusIcon(messageItem, view);
        }

        if (isMUC) {
            append(builder, resource, new TextAppearanceSpan(activity, R.style.ChatHeader_Time));
            append(builder, divider, new TextAppearanceSpan(activity, R.style.ChatHeader));
        }

        Date delayTimestamp = messageItem.getDelayTimestamp();


        if (messageItem.isUnencypted()) {
            append(builder, activity.getString(R.string.otr_unencrypted_message),
                    new TextAppearanceSpan(activity, R.style.ChatHeader_Delay));
            append(builder, divider, new TextAppearanceSpan(activity, R.style.ChatHeader));
        }

        Spannable text = messageItem.getSpannable();
        if (messageItem.getTag() == null) {
            builder.append(text);
        } else {
            append(builder, text, new TextAppearanceSpan(activity, R.style.ChatRead));
        }

        TextView textView = (TextView) view.findViewById(R.id.message_text);
        textView.setTextAppearance(activity, appearanceStyle);
        textView.setText(builder);
        textView.getBackground().setLevel(AccountManager.getInstance().getColorLevel(account));

        String time = StringUtils.getSmartTimeText(activity, messageItem.getTimestamp());

        if (delayTimestamp != null) {
            String delay = activity.getString(incoming ? R.string.chat_delay : R.string.chat_typed,
                    StringUtils.getSmartTimeText(activity, delayTimestamp));
            time += " (" + delay + ")";
        }

        ((TextView)view.findViewById(R.id.message_time)).setText(time);

        if (incoming) {
            setUpAvatar(messageItem, view);
        }
    }

    private void setStatusIcon(MessageItem messageItem, View view) {
        ImageView messageStatusIcon = (ImageView) view.findViewById(R.id.message_status_icon);
        messageStatusIcon.setVisibility(View.VISIBLE);

        int messageIcon = R.drawable.ic_message_delivered_18dp;
        if (messageItem.isError()) {
            messageIcon = R.drawable.ic_message_has_error_18dp;
        } else if (!messageItem.isSent()) {
            messageIcon = R.drawable.ic_message_not_sent_18dp;
        } else if (!messageItem.isDelivered()) {
            messageStatusIcon.setVisibility(View.INVISIBLE);
        }

        messageStatusIcon.setImageResource(messageIcon);
    }

    private void append(SpannableStringBuilder builder, CharSequence text, CharacterStyle span) {
        int start = builder.length();
        builder.append(text);
        builder.setSpan(span, start, start + text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }

    private void setUpAvatar(MessageItem messageItem, View view) {
        ImageView avatarView = (ImageView) view.findViewById(R.id.avatar);

        if (SettingsManager.chatsShowAvatars()) {
            final String account = messageItem.getChat().getAccount();
            final String user = messageItem.getChat().getUser();
            final String resource = messageItem.getResource();

            avatarView.setVisibility(View.VISIBLE);
            if ((isMUC && MUCManager.getInstance().getNickname(account, user).equalsIgnoreCase(resource))) {
                avatarView.setImageDrawable(AvatarManager.getInstance().getAccountAvatar(account));
            } else {
                if (isMUC) {
                    if ("".equals(resource)) {
                        avatarView.setImageDrawable(AvatarManager.getInstance().getRoomAvatar(user));
                    } else {
                        avatarView.setImageDrawable(AvatarManager.getInstance().getOccupantAvatar(user + "/" + resource));
                    }
                } else {
                    avatarView.setImageDrawable(AvatarManager.getInstance().getUserAvatar(user));
                }
            }
        } else {
            avatarView.setVisibility(View.GONE);
        }
    }

    @Override
    public void onChange() {
        messages = new ArrayList<>(MessageManager.getInstance().getMessages(account, user));
        hint = getHint();
        notifyDataSetChanged();
    }

    /**
     * @return New hint.
     */
    private String getHint() {
        AccountItem accountItem = AccountManager.getInstance().getAccount(account);
        boolean online = accountItem != null && accountItem.getState().isConnected();
        final AbstractContact abstractContact = RosterManager.getInstance().getBestContact(account, user);
        if (!online) {
            if (abstractContact instanceof RoomContact) {
                return activity.getString(R.string.muc_is_unavailable);
            } else {
                return activity.getString(R.string.account_is_offline);
            }
        } else if (!abstractContact.getStatusMode().isOnline()) {
            if (abstractContact instanceof RoomContact) {
                return activity.getString(R.string.muc_is_unavailable);
            } else {
                return activity.getString(R.string.contact_is_offline, abstractContact.getName());
            }
        }
        return null;
    }
}
