/*
 * Copyright 2016 Christian Basler
 *
 * 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 ch.dissem.apps.abit;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AutoCompleteTextView;
import android.widget.EditText;
import android.widget.Toast;

import java.util.List;

import ch.dissem.apps.abit.adapter.ContactAdapter;
import ch.dissem.apps.abit.dialog.SelectEncodingDialogFragment;
import ch.dissem.apps.abit.service.Singleton;
import ch.dissem.bitmessage.BitmessageContext;
import ch.dissem.bitmessage.entity.BitmessageAddress;
import ch.dissem.bitmessage.entity.Plaintext;
import ch.dissem.bitmessage.entity.valueobject.extended.Message;

import static android.app.Activity.RESULT_OK;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_BROADCAST;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_CONTENT;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_ENCODING;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_IDENTITY;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_PARENT;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_RECIPIENT;
import static ch.dissem.apps.abit.ComposeMessageActivity.EXTRA_SUBJECT;
import static ch.dissem.bitmessage.entity.Plaintext.Type.BROADCAST;
import static ch.dissem.bitmessage.entity.Plaintext.Type.MSG;

/**
 * Compose a new message.
 */
public class ComposeMessageFragment extends Fragment {
    private BitmessageAddress identity;
    private BitmessageAddress recipient;
    private String subject;
    private String content;
    private AutoCompleteTextView recipientInput;
    private EditText subjectInput;
    private EditText bodyInput;
    private boolean broadcast;
    private Plaintext.Encoding encoding;
    private Plaintext parent;

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the
     * fragment (e.g. upon screen orientation changes).
     */
    public ComposeMessageFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            if (getArguments().containsKey(EXTRA_IDENTITY)) {
                identity = (BitmessageAddress) getArguments().getSerializable(EXTRA_IDENTITY);
                if (getActivity() != null) {
                    if (identity == null || identity.getPrivateKey() == null) {
                        identity = Singleton.getIdentity(getActivity());
                    }
                }
            } else {
                throw new RuntimeException("No identity set for ComposeMessageFragment");
            }
            broadcast = getArguments().getBoolean(EXTRA_BROADCAST, false);
            if (getArguments().containsKey(EXTRA_RECIPIENT)) {
                recipient = (BitmessageAddress) getArguments().getSerializable(EXTRA_RECIPIENT);
            }
            if (getArguments().containsKey(EXTRA_SUBJECT)) {
                subject = getArguments().getString(EXTRA_SUBJECT);
            }
            if (getArguments().containsKey(EXTRA_CONTENT)) {
                content = getArguments().getString(EXTRA_CONTENT);
            }
            if (getArguments().containsKey(EXTRA_ENCODING)) {
                encoding = (Plaintext.Encoding) getArguments().getSerializable(EXTRA_ENCODING);
            } else {
                encoding = Plaintext.Encoding.SIMPLE;
            }
            if (getArguments().containsKey(EXTRA_PARENT)) {
                parent = (Plaintext) getArguments().getSerializable(EXTRA_PARENT);
            }
        } else {
            throw new RuntimeException("No identity set for ComposeMessageFragment");
        }
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_compose_message, container, false);
        recipientInput = (AutoCompleteTextView) rootView.findViewById(R.id.recipient);
        if (broadcast) {
            recipientInput.setVisibility(View.GONE);
        } else {
            final ContactAdapter adapter = new ContactAdapter(getContext());
            recipientInput.setAdapter(adapter);
            recipientInput.setOnItemClickListener(
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int pos, long id) {
                        adapter.getItem(pos);
                    }
                }
            );
            recipientInput.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int position, long
                    id) {
                    recipient = adapter.getItem(position);
                }

                @Override
                public void onNothingSelected(AdapterView<?> parent) {
                }
            });
            if (recipient != null) {
                recipientInput.setText(recipient.toString());
            }
        }
        subjectInput = (EditText) rootView.findViewById(R.id.subject);
        subjectInput.setText(subject);
        bodyInput = (EditText) rootView.findViewById(R.id.body);
        bodyInput.setText(content);

        if (recipient == null) {
            recipientInput.requestFocus();
        } else if (subject == null || subject.isEmpty()) {
            subjectInput.requestFocus();
        } else {
            bodyInput.requestFocus();
            bodyInput.setSelection(0);
        }

        return rootView;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (identity == null || identity.getPrivateKey() == null) {
            identity = Singleton.getIdentity(context);
        }
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.compose, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.send:
                send();
                return true;
            case R.id.select_encoding:
                SelectEncodingDialogFragment encodingDialog = new SelectEncodingDialogFragment();
                Bundle args = new Bundle();
                args.putSerializable(EXTRA_ENCODING, encoding);
                encodingDialog.setArguments(args);
                encodingDialog.setTargetFragment(this, 0);
                encodingDialog.show(getFragmentManager(), "select encoding dialog");
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 0 && resultCode == RESULT_OK) {
            encoding = (Plaintext.Encoding) data.getSerializableExtra(EXTRA_ENCODING);
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    private void send() {
        Plaintext.Builder builder;
        BitmessageContext bmc = Singleton.getBitmessageContext(getContext());
        if (broadcast) {
            builder = new Plaintext.Builder(BROADCAST)
                .from(identity);
        } else {
            String inputString = recipientInput.getText().toString();
            if (recipient == null || !recipient.toString().equals(inputString)) {
                try {
                    recipient = new BitmessageAddress(inputString);
                } catch (Exception e) {
                    List<BitmessageAddress> contacts = Singleton.getAddressRepository
                        (getContext()).getContacts();
                    for (BitmessageAddress contact : contacts) {
                        if (inputString.equalsIgnoreCase(contact.getAlias())) {
                            recipient = contact;
                            if (inputString.equals(contact.getAlias()))
                                break;
                        }
                    }
                }
            }
            builder = new Plaintext.Builder(MSG)
                .from(identity)
                .to(recipient);
        }
        switch (encoding) {
            case SIMPLE:
                builder.message(
                    subjectInput.getText().toString(),
                    bodyInput.getText().toString()
                );
                break;
            case EXTENDED:
                builder.message(
                    new Message.Builder()
                        .subject(subjectInput.getText().toString())
                        .body(bodyInput.getText().toString())
                        .addParent(parent)
                        .build()
                );
                break;
            default:
                Toast.makeText(
                    getContext(),
                    getContext().getString(R.string.error_unsupported_encoding, encoding),
                    Toast.LENGTH_LONG
                ).show();
                builder.message(
                    subjectInput.getText().toString(),
                    bodyInput.getText().toString()
                );
                break;
        }
        bmc.send(builder.build());
        getActivity().finish();
    }
}