package com.xabber.android.ui;

import java.util.Collection;

import android.os.Bundle;
import android.os.SystemClock;
import android.support.v4.app.Fragment;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

import com.xabber.android.data.Application;
import com.xabber.android.data.SettingsManager;
import com.xabber.android.data.account.AccountManager;
import com.xabber.android.data.account.CommonState;
import com.xabber.android.data.account.OnAccountChangedListener;
import com.xabber.android.data.account.StatusMode;
import com.xabber.android.data.connection.ConnectionManager;
import com.xabber.android.data.entity.BaseEntity;
import com.xabber.android.data.message.OnChatChangedListener;
import com.xabber.android.data.roster.AbstractContact;
import com.xabber.android.data.roster.OnContactChangedListener;
import com.xabber.android.ui.adapter.AccountConfiguration;
import com.xabber.android.ui.adapter.ContactListAdapter;
import com.xabber.android.ui.adapter.ContactListAdapter.OnContactListChangedListener;
import com.xabber.android.ui.adapter.ContactListState;
import com.xabber.android.ui.adapter.GroupConfiguration;
import com.xabber.android.ui.adapter.UpdatableAdapter;
import com.xabber.android.ui.helper.ContextMenuHelper;
import com.xabber.android.ui.preferences.AccountList;
import com.xabber.androiddev.R;

public class ContactListFragment extends Fragment implements
        OnAccountChangedListener, OnContactChangedListener,
        OnChatChangedListener, OnItemClickListener,
        OnContactListChangedListener {

    private ContactListAdapter adapter;

    private ListView listView;

    /**
     * View with information shown on empty contact list.
     */
    private View infoView;

    /**
     * Image view with connected icon.
     */
    private View connectedView;

    /**
     * Image view with disconnected icon.
     */
    private View disconnectedView;

    /**
     * View with help text.
     */
    private TextView textView;

    /**
     * Button to apply help text.
     */
    private Button buttonView;

    /**
     * Animation for disconnected view.
     */
    private Animation animation;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.contact_list_fragment, container,
                false);
        listView = (ListView) view.findViewById(android.R.id.list);
        listView.setOnItemClickListener(this);
        listView.setItemsCanFocus(true);
        registerForContextMenu(listView);
        adapter = new ContactListAdapter(getActivity(), listView, this);
        listView.setAdapter(adapter);
        infoView = view.findViewById(R.id.info);
        connectedView = infoView.findViewById(R.id.connected);
        disconnectedView = infoView.findViewById(R.id.disconnected);
        textView = (TextView) infoView.findViewById(R.id.text);
        buttonView = (Button) infoView.findViewById(R.id.button);
        animation = AnimationUtils.loadAnimation(getActivity(),
                R.anim.connection);
        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        Application.getInstance().addUIListener(OnAccountChangedListener.class,
                this);
        Application.getInstance().addUIListener(OnContactChangedListener.class,
                this);
        Application.getInstance().addUIListener(OnChatChangedListener.class,
                this);
        adapter.onChange();
    }

    @Override
    public void onPause() {
        super.onPause();
        unregisterListeners();
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View view,
                                    ContextMenuInfo menuInfo) {
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
        BaseEntity baseEntity = (BaseEntity) listView
                .getItemAtPosition(info.position);
        if (baseEntity instanceof AbstractContact) {
            ContextMenuHelper.createContactContextMenu(getActivity(), adapter,
                    (AbstractContact) baseEntity, menu);
        } else if (baseEntity instanceof AccountConfiguration) {
            ContextMenuHelper.createAccountContextMenu(getActivity(), adapter,
                    baseEntity.getAccount(), menu);
        } else if (baseEntity instanceof GroupConfiguration) {
            ContextMenuHelper.createGroupContextMenu(getActivity(), adapter,
                    baseEntity.getAccount(), baseEntity.getUser(), menu);
        } else
            throw new IllegalStateException();
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
                            long id) {
        Object object = parent.getAdapter().getItem(position);
        if (object instanceof AbstractContact) {
            ((OnContactClickListener) getActivity())
                    .onContactClick((AbstractContact) object);
        } else if (object instanceof GroupConfiguration) {
            GroupConfiguration groupConfiguration = (GroupConfiguration) object;
            adapter.setExpanded(groupConfiguration.getAccount(),
                    groupConfiguration.getUser(),
                    !groupConfiguration.isExpanded());
        } else
            throw new IllegalStateException();
    }

    @Override
    public void onContactsChanged(Collection<BaseEntity> addresses) {
        adapter.refreshRequest();
    }

    @Override
    public void onAccountsChanged(Collection<String> accounts) {
        adapter.refreshRequest();
    }

    @Override
    public void onChatChanged(String account, String user, boolean incoming) {
        if (incoming)
            adapter.refreshRequest();
    }

    @Override
    public void onContactListChanged(CommonState commonState,
                                     boolean hasContacts, boolean hasVisibleContacts,
                                     boolean isFilterEnabled) {
        if (hasVisibleContacts) {
            infoView.setVisibility(View.GONE);
            disconnectedView.clearAnimation();
            return;
        }
        infoView.setVisibility(View.VISIBLE);
        final int text;
        final int button;
        final ContactListState state;
        final OnClickListener listener;
        if (isFilterEnabled) {
            if (commonState == CommonState.online)
                state = ContactListState.online;
            else if (commonState == CommonState.roster
                    || commonState == CommonState.connecting)
                state = ContactListState.connecting;
            else
                state = ContactListState.offline;
            text = R.string.application_state_no_online;
            button = 0;
            listener = null;
        } else if (hasContacts) {
            state = ContactListState.online;
            text = R.string.application_state_no_online;
            button = R.string.application_action_no_online;
            listener = new OnClickListener() {

                @Override
                public void onClick(View view) {
                    SettingsManager.setContactsShowOffline(true);
                    adapter.onChange();
                }

            };
        } else if (commonState == CommonState.online) {
            state = ContactListState.online;
            text = R.string.application_state_no_contacts;
            button = R.string.application_action_no_contacts;
            listener = new OnClickListener() {

                @Override
                public void onClick(View view) {
                    startActivity(ContactAdd.createIntent(getActivity()));
                }

            };
        } else if (commonState == CommonState.roster) {
            state = ContactListState.connecting;
            text = R.string.application_state_roster;
            button = 0;
            listener = null;
        } else if (commonState == CommonState.connecting) {
            state = ContactListState.connecting;
            text = R.string.application_state_connecting;
            button = 0;
            listener = null;
        } else if (commonState == CommonState.waiting) {
            state = ContactListState.offline;
            text = R.string.application_state_waiting;
            button = R.string.application_action_waiting;
            listener = new OnClickListener() {

                @Override
                public void onClick(View view) {
                    ConnectionManager.getInstance().updateConnections(true);
                }

            };
        } else if (commonState == CommonState.offline) {
            state = ContactListState.offline;
            text = R.string.application_state_offline;
            button = R.string.application_action_offline;
            listener = new OnClickListener() {

                @Override
                public void onClick(View view) {
                    AccountManager.getInstance().setStatus(
                            StatusMode.available, null);
                }

            };
        } else if (commonState == CommonState.disabled) {
            state = ContactListState.offline;
            text = R.string.application_state_disabled;
            button = R.string.application_action_disabled;
            listener = new OnClickListener() {

                @Override
                public void onClick(View view) {
                    startActivity(AccountList.createIntent(getActivity()));
                }

            };
        } else if (commonState == CommonState.empty) {
            state = ContactListState.offline;
            text = R.string.application_state_empty;
            button = R.string.application_action_empty;
            listener = new OnClickListener() {

                @Override
                public void onClick(View view) {
                    startActivity(AccountAdd.createIntent(getActivity()));
                }

            };
        } else {
            throw new IllegalStateException();
        }
        if (state == ContactListState.offline) {
            connectedView.setVisibility(View.INVISIBLE);
            disconnectedView.setVisibility(View.VISIBLE);
            disconnectedView.clearAnimation();
        } else if (state == ContactListState.connecting) {
            connectedView.setVisibility(View.VISIBLE);
            disconnectedView.setVisibility(View.VISIBLE);
            if (disconnectedView.getAnimation() == null)
                disconnectedView.startAnimation(animation);
        } else if (state == ContactListState.online) {
            connectedView.setVisibility(View.VISIBLE);
            disconnectedView.setVisibility(View.INVISIBLE);
            disconnectedView.clearAnimation();
        }
        textView.setText(text);
        if (button == 0) {
            buttonView.setVisibility(View.GONE);
        } else {
            buttonView.setVisibility(View.VISIBLE);
            buttonView.setText(button);
        }
        buttonView.setOnClickListener(listener);
    }

    /**
     * Force stop contact list updates before pause or application close.
     */
    void unregisterListeners() {
        Application.getInstance().removeUIListener(
                OnAccountChangedListener.class, this);
        Application.getInstance().removeUIListener(
                OnContactChangedListener.class, this);
        Application.getInstance().removeUIListener(OnChatChangedListener.class,
                this);
        adapter.removeRefreshRequests();
    }

    UpdatableAdapter getAdapter() {
        return adapter;
    }

    /**
     * Scroll contact list to specified account.
     *
     * @param account
     */
    void scrollTo(String account) {
        long count = listView.getCount();
        for (int position = 0; position < (int) count; position++) {
            BaseEntity baseEntity = (BaseEntity) listView
                    .getItemAtPosition(position);
            if (baseEntity != null
                    && baseEntity instanceof AccountConfiguration
                    && baseEntity.getAccount().equals(account)) {
                stopMovement();
                listView.setSelection(position);
                break;
            }
        }
    }

    /**
     * Filter out contact list for selected account.
     *
     * @param account
     */
    void setSelectedAccount(String account) {
        if (account.equals(AccountManager.getInstance().getSelectedAccount()))
            SettingsManager.setContactsSelectedAccount("");
        else
            SettingsManager.setContactsSelectedAccount(account);
        stopMovement();
        adapter.onChange();
    }

    /**
     * Scroll to the top of contact list.
     */
    void scrollUp() {
        if (listView.getCount() > 0)
            listView.setSelection(0);
        stopMovement();
    }

    /**
     * Stop fling scrolling.
     */
    private void stopMovement() {
        MotionEvent event = MotionEvent.obtain(SystemClock.uptimeMillis(),
                SystemClock.uptimeMillis(), MotionEvent.ACTION_CANCEL, 0, 0, 0);
        listView.onTouchEvent(event);
        event.recycle();
    }

    public interface OnContactClickListener {

        void onContactClick(AbstractContact contact);

    }

}
