package de.pixart.messenger.ui;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.StringRes;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBar;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import de.pixart.messenger.Config;
import de.pixart.messenger.R;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.Contact;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.ListItem;
import de.pixart.messenger.entities.MucOptions;
import de.pixart.messenger.ui.interfaces.OnBackendConnected;
import de.pixart.messenger.ui.util.ActivityResult;
import de.pixart.messenger.ui.util.PendingItem;
import de.pixart.messenger.utils.XmppUri;
import rocks.xmpp.addr.Jid;

public class ChooseContactActivity extends AbstractSearchableListItemActivity {
    public static final String EXTRA_TITLE_RES_ID = "extra_title_res_id";
    private List<String> mActivatedAccounts = new ArrayList<>();
    private Set<String> selected = new HashSet<>();
    private Set<String> filterContacts;

    private PendingItem<ActivityResult> postponedActivityResult = new PendingItem<>();

    public static Intent create(Activity activity, Conversation conversation) {
        final Intent intent = new Intent(activity, ChooseContactActivity.class);
        List<String> contacts = new ArrayList<>();
        if (conversation.getMode() == Conversation.MODE_MULTI) {
            for (MucOptions.User user : conversation.getMucOptions().getUsers(false)) {
                Jid jid = user.getRealJid();
                if (jid != null) {
                    contacts.add(jid.asBareJid().toString());
                }
            }
        } else {
            contacts.add(conversation.getJid().asBareJid().toString());
        }
        intent.putExtra("filter_contacts", contacts.toArray(new String[contacts.size()]));
        intent.putExtra("conversation", conversation.getUuid());
        intent.putExtra("multiple", true);
        intent.putExtra("show_enter_jid", true);
        intent.putExtra(EXTRA_ACCOUNT, conversation.getAccount().getJid().asBareJid().toString());
        return intent;
    }

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        filterContacts = new HashSet<>();
        if (savedInstanceState != null) {
            String[] selectedContacts = savedInstanceState.getStringArray("selected_contacts");
            if (selectedContacts != null) {
                selected.clear();
                selected.addAll(Arrays.asList(selectedContacts));
            }
        }
        String[] contacts = getIntent().getStringArrayExtra("filter_contacts");
        if (contacts != null) {
            Collections.addAll(filterContacts, contacts);
        }

        if (getIntent().getBooleanExtra("multiple", false)) {
            getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
            getListView().setMultiChoiceModeListener(new MultiChoiceModeListener() {

                @Override
                public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
                    return false;
                }

                @Override
                public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                    binding.fab.setVisibility(View.GONE);
                    final View view = getSearchEditText();
                    final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    if (view != null && imm != null) {
                        imm.hideSoftInputFromWindow(getSearchEditText().getWindowToken(), InputMethodManager.HIDE_IMPLICIT_ONLY);
                    }
                    MenuInflater inflater = getMenuInflater();
                    inflater.inflate(R.menu.select_multiple, menu);
                    MenuItem selectButton = menu.findItem(R.id.selection_submit);
                    String buttonText = getResources().getQuantityString(R.plurals.select_contact, selected.size(), selected.size());
                    selectButton.setTitle(buttonText);
                    return true;
                }

                @Override
                public void onDestroyActionMode(ActionMode mode) {
                    binding.fab.setVisibility(View.VISIBLE);
                    selected.clear();
                }

                @Override
                public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                    switch (item.getItemId()) {
                        case R.id.selection_submit:
                            final Intent request = getIntent();
                            final Intent data = new Intent();
                            data.putExtra("conversation",
                                    request.getStringExtra("conversation"));
                            String[] selection = getSelectedContactJids();
                            data.putExtra("contacts", selection);
                            data.putExtra("multiple", true);
                            data.putExtra(EXTRA_ACCOUNT, request.getStringExtra(EXTRA_ACCOUNT));
                            data.putExtra("subject", request.getStringExtra("subject"));
                            setResult(RESULT_OK, data);
                            finish();
                            return true;
                    }
                    return false;
                }

                @Override
                public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
                    Contact item = (Contact) getListItems().get(position);
                    if (checked) {
                        selected.add(item.getJid().toString());
                    } else {
                        selected.remove(item.getJid().toString());
                    }
                    int numSelected = selected.size();
                    MenuItem selectButton = mode.getMenu().findItem(R.id.selection_submit);
                    String buttonText = getResources().getQuantityString(R.plurals.select_contact,
                            numSelected, numSelected);
                    selectButton.setTitle(buttonText);
                }
            });
        }


        getListView().setOnItemClickListener((parent, view, position, id) -> {
            final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(getSearchEditText().getWindowToken(), InputMethodManager.HIDE_IMPLICIT_ONLY);
            final Intent request = getIntent();
            final Intent data = new Intent();
            final ListItem mListItem = getListItems().get(position);
            data.putExtra("contact", mListItem.getJid().toString());
            String account = request.getStringExtra(EXTRA_ACCOUNT);
            if (account == null && mListItem instanceof Contact) {
                account = ((Contact) mListItem).getAccount().getJid().asBareJid().toString();
            }
            data.putExtra(EXTRA_ACCOUNT, account);
            data.putExtra("conversation", request.getStringExtra("conversation"));
            data.putExtra("multiple", false);
            data.putExtra("subject", request.getStringExtra("subject"));
            setResult(RESULT_OK, data);
            finish();
        });
        final Intent i = getIntent();
        boolean showEnterJid = i != null && i.getBooleanExtra("show_enter_jid", false);
        if (showEnterJid) {
            this.binding.fab.setOnClickListener((v) -> showEnterJidDialog(null));
        } else {
            this.binding.fab.setVisibility(View.GONE);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        Intent intent = getIntent();
        @StringRes
        int res = intent != null ? intent.getIntExtra(EXTRA_TITLE_RES_ID, R.string.title_activity_choose_contact) : R.string.title_activity_choose_contact;
        ActionBar bar = getSupportActionBar();
        if (bar != null) {
            try {
                bar.setTitle(res);
            } catch (Exception e) {
                bar.setTitle(R.string.title_activity_choose_contact);
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        super.onCreateOptionsMenu(menu);
        final Intent i = getIntent();
        boolean showEnterJid = i != null && i.getBooleanExtra("show_enter_jid", false);
        menu.findItem(R.id.action_scan_qr_code).setVisible(isCameraFeatureAvailable() && showEnterJid);
        return true;
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        savedInstanceState.putStringArray("selected_contacts", getSelectedContactJids());
        super.onSaveInstanceState(savedInstanceState);
    }

    protected void filterContacts(final String needle) {
        getListItems().clear();
        if (xmppConnectionService == null) {
            getListItemAdapter().notifyDataSetChanged();
            return;
        }
        for (final Account account : xmppConnectionService.getAccounts()) {
            if (account.getStatus() != Account.State.DISABLED) {
                for (final Contact contact : account.getRoster().getContacts()) {
                    if (contact.showInRoster() &&
                            !filterContacts.contains(contact.getJid().asBareJid().toString())
                            && contact.match(this, needle)) {
                        getListItems().add(contact);
                    }
                }
            }
        }
        Collections.sort(getListItems());
        getListItemAdapter().notifyDataSetChanged();
    }

    private String[] getSelectedContactJids() {
        return selected.toArray(new String[selected.size()]);
    }

    public void refreshUiReal() {
        //nothing to do. This Activity doesn't implement any listeners
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_scan_qr_code:
                ScanActivity.scan(this);
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    protected void showEnterJidDialog(XmppUri uri) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag("dialog");
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);
        Jid jid = uri == null ? null : uri.getJid();
        EnterJidDialog dialog = EnterJidDialog.newInstance(
                mActivatedAccounts,
                getString(R.string.enter_contact),
                getString(R.string.select),
                jid == null ? null : jid.asBareJid().toString(),
                getIntent().getStringExtra(EXTRA_ACCOUNT),
                true,
                xmppConnectionService.multipleAccounts()
        );

        dialog.setOnEnterJidDialogPositiveListener((accountJid, contactJid) -> {
            final Intent request = getIntent();
            final Intent data = new Intent();
            data.putExtra("contact", contactJid.toString());
            data.putExtra(EXTRA_ACCOUNT, accountJid.toString());
            data.putExtra("conversation",
                    request.getStringExtra("conversation"));
            data.putExtra("multiple", false);
            data.putExtra("subject", request.getStringExtra("subject"));
            setResult(RESULT_OK, data);
            finish();

            return true;
        });

        dialog.show(ft, "dialog");
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, requestCode, intent);
        ActivityResult activityResult = ActivityResult.of(requestCode, resultCode, intent);
        if (xmppConnectionService != null) {
            handleActivityResult(activityResult);
        } else {
            this.postponedActivityResult.push(activityResult);
        }
    }

    private void handleActivityResult(ActivityResult activityResult) {
        if (activityResult.resultCode == RESULT_OK && activityResult.requestCode == ScanActivity.REQUEST_SCAN_QR_CODE) {
            String result = activityResult.data.getStringExtra(ScanActivity.INTENT_EXTRA_RESULT);
            XmppUri uri = new XmppUri(result == null ? "" : result);
            if (uri.isJidValid()) {
                showEnterJidDialog(uri);
            }
        }
    }

    @Override
    void onBackendConnected() {
        filterContacts();

        this.mActivatedAccounts.clear();
        for (Account account : xmppConnectionService.getAccounts()) {
            if (account.getStatus() != Account.State.DISABLED) {
                if (Config.DOMAIN_LOCK != null) {
                    this.mActivatedAccounts.add(account.getJid().getLocal());
                } else {
                    this.mActivatedAccounts.add(account.getJid().asBareJid().toString());
                }
            }
        }
        ActivityResult activityResult = this.postponedActivityResult.pop();
        if (activityResult != null) {
            handleActivityResult(activityResult);
        }
        Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG_DIALOG);
        if (fragment != null && fragment instanceof OnBackendConnected) {
            ((OnBackendConnected) fragment).onBackendConnected();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
        ScanActivity.onRequestPermissionResult(this, requestCode, grantResults);
    }
}