/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * 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 com.android.incallui;

import com.android.services.telephony.common.Call;

import java.util.ArrayList;

/**
 * Presenter for the Incoming call widget.
 */
public class AnswerPresenter extends Presenter<AnswerPresenter.AnswerUi>
        implements CallList.CallUpdateListener, CallList.Listener {

    private static final String TAG = AnswerPresenter.class.getSimpleName();

    private int mCallId = Call.INVALID_CALL_ID;

    @Override
    public void onUiReady(AnswerUi ui) {
        super.onUiReady(ui);

        final CallList calls = CallList.getInstance();
        final Call call = calls.getIncomingCall();
        // TODO: change so that answer presenter never starts up if it's not incoming.
        if (call != null) {
            processIncomingCall(call);
        }

        // Listen for incoming calls.
        calls.addListener(this);
    }

    @Override
    public void onUiUnready(AnswerUi ui) {
        super.onUiUnready(ui);

        CallList.getInstance().removeListener(this);

        // This is necessary because the activity can be destroyed while an incoming call exists.
        // This happens when back button is pressed while incoming call is still being shown.
        if (mCallId != Call.INVALID_CALL_ID) {
            CallList.getInstance().removeCallUpdateListener(mCallId, this);
        }

    }

    @Override
    public void onCallListChange(CallList callList) {
        // no-op
    }

    @Override
    public void onIncomingCall(Call call) {
        // TODO: Ui is being destroyed when the fragment detaches.  Need clean up step to stop
        // getting updates here.
        if (getUi() != null) {
            if (call.getCallId() != mCallId) {
                // A new call is coming in.
                processIncomingCall(call);
            }
        }
    }

    private void processIncomingCall(Call call) {
        mCallId = call.getCallId();

        // Listen for call updates for the current call.
        CallList.getInstance().addCallUpdateListener(mCallId, this);

        Log.d(TAG, "Showing incoming for call id: " + mCallId);
        final ArrayList<String> textMsgs = CallList.getInstance().getTextResponses(
                call.getCallId());
        getUi().showAnswerUi(true);

        if (call.can(Call.Capabilities.RESPOND_VIA_TEXT) && textMsgs != null) {
            getUi().showTextButton(true);
            getUi().configureMessageDialogue(textMsgs);
        } else {
            getUi().showTextButton(false);
        }
    }


    @Override
    public void onCallStateChanged(Call call) {
        Log.d(TAG, "onCallStateChange() " + call);
        if (call.getState() != Call.State.INCOMING && call.getState() != Call.State.CALL_WAITING) {
            // Stop listening for updates.
            CallList.getInstance().removeCallUpdateListener(mCallId, this);

            getUi().showAnswerUi(false);
            mCallId = Call.INVALID_CALL_ID;
        }
    }

    public void onAnswer() {
        if (mCallId == Call.INVALID_CALL_ID) {
            return;
        }

        Log.d(this, "onAnswer " + mCallId);

        CallCommandClient.getInstance().answerCall(mCallId);
    }

    public void onDecline() {
        if (mCallId == Call.INVALID_CALL_ID) {
            return;
        }

        Log.d(this, "onDecline " + mCallId);

        CallCommandClient.getInstance().rejectCall(mCallId, false, null);
    }

    public void onText() {
        if (getUi() != null) {
            getUi().showMessageDialogue();
        }
    }

    public void rejectCallWithMessage(String message) {
        Log.d(this, "sendTextToDefaultActivity()...");
        if (getUi() != null) {
            getUi().dismissPopup();
        }
        CallCommandClient.getInstance().rejectCall(mCallId, true, message);
    }

    interface AnswerUi extends Ui {
        public void showAnswerUi(boolean show);
        public void showTextButton(boolean show);
        public boolean isMessageDialogueShowing();
        public void showMessageDialogue();
        public void dismissPopup();
        public void configureMessageDialogue(ArrayList<String> textResponses);
    }
}