/*
 * Copyright (C) 2011 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.camera.ui;

import com.android.camera.CameraPreference.OnPreferenceChangedListener;
import com.android.camera.IconListPreference;
import com.android.camera.ListPreference;
import com.android.camera.PreferenceGroup;
import com.android.camera.CameraSettings;
import com.android.camera.R;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;

import java.util.ArrayList;

/**
 * A view that contains camera setting indicators. The indicators are spreaded
 * differently based on the screen resolution.
 */
public abstract class IndicatorControl extends RelativeLayout implements
        IndicatorButton.Listener, OtherSettingsPopup.Listener {
    private static final String TAG = "IndicatorControl";

    private Context mContext;
    private OnPreferenceChangedListener mListener;
    protected OnIndicatorEventListener mOnIndicatorEventListener;
    protected CameraPicker mCameraPicker;

    private PreferenceGroup mPreferenceGroup;
    private int mDegree = 0;

    ArrayList<AbstractIndicatorButton> mIndicators =
            new ArrayList<AbstractIndicatorButton>();

    public void setListener(OnPreferenceChangedListener listener) {
        mListener = listener;
        if (mCameraPicker != null) mCameraPicker.setListener(listener);
    }

    public IndicatorControl(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
    }

    public void setDegree(int degree) {
        mDegree = degree;
        int count = getChildCount();
        for (int i = 0 ; i < count ; ++i) {
            View view = getChildAt(i);
            if (view instanceof RotateImageView) {
                ((RotateImageView) view).setDegree(degree);
            }
        }
    }

    public void setOnIndicatorEventListener(OnIndicatorEventListener listener) {
        mOnIndicatorEventListener = listener;
    }

    // For the initialization of first-level indicator control.
    public void initialize(Context context, PreferenceGroup group,
            String flashSetting, String[] keys, String[] otherSettingKeys) {
        initialize(context, group, keys, otherSettingKeys);
    }

    public void initialize(Context context, PreferenceGroup group,
            String[] keys, String[] otherSettingKeys) {
        // Reset the variables and states.
        dismissSettingPopup();
        removeIndicators();

        // Initialize all variables and icons.
        mPreferenceGroup = group;
        // Add other settings indicator.
        if (otherSettingKeys != null) {
            addOtherSettingIndicator(context, R.drawable.ic_settings_holo_light, otherSettingKeys);
        }

        for (int i = 0; i < keys.length; i++) {
            IconListPreference pref = (IconListPreference) group.findPreference(keys[i]);
            if (pref != null) {
                addIndicator(context, pref);
            }
        }
        requestLayout();
    }

    public void initializeCameraPicker(Context context, PreferenceGroup group) {
        ListPreference pref = group.findPreference(
                CameraSettings.KEY_CAMERA_ID);
        if (pref == null) return;
        mCameraPicker = new CameraPicker(context);
        mCameraPicker.initialize(pref);
        addView(mCameraPicker);
    }

    private void removeIndicators() {
        for (View v: mIndicators) {
            removeView(v);
        }
        mIndicators.clear();
    }

    @Override
    public boolean shouldDelayChildPressedState() {
        // Return false so the pressed feedback of the back/front camera switch
        // can be showed right away.
        return false;
    }

    public void addIndicator(Context context, IconListPreference pref) {
        IndicatorButton b = new IndicatorButton(context, pref);
        b.setSettingChangedListener(this);
        addView(b);
        mIndicators.add(b);
    }

    public void addOtherSettingIndicator(Context context, int resId, String[] keys) {
        OtherSettingIndicatorButton b = new OtherSettingIndicatorButton(context, resId,
                mPreferenceGroup, keys);
        b.setSettingChangedListener(this);
        addView(b);
        mIndicators.add(b);
    }

    @Override
    public void onRestorePreferencesClicked() {
        if (mListener != null) {
            mListener.onRestorePreferencesClicked();
        }
    }

    @Override
    public void onSettingChanged() {
        if (mListener != null) {
            mListener.onSharedPreferenceChanged();
        }
    }

    public boolean dismissSettingPopup() {
        for (AbstractIndicatorButton v: mIndicators) {
            if (v.dismissPopup()) {
                invalidate();
                return true;
            }
        }
        return false;
    }

    public View getActiveSettingPopup() {
        for (AbstractIndicatorButton v: mIndicators) {
            View result = v.getPopupWindow();
            if (result != null) return result;
        }
        return null;
    }

    // Scene mode may override other camera settings (ex: flash mode).
    public void overrideSettings(final String ... keyvalues) {
        if (keyvalues.length % 2 != 0) {
            throw new IllegalArgumentException();
        }

        for (AbstractIndicatorButton b: mIndicators) {
            b.overrideSettings(keyvalues);
        }
    }

    public void reloadPreferences() {
        mPreferenceGroup.reloadValue();
        for (AbstractIndicatorButton b: mIndicators) {
            b.reloadPreferences();
        }
    }

    @Override
    public void setEnabled(boolean enabled) {
        super.setEnabled(enabled);
        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            View v = getChildAt(i);
            // Zoom buttons and shutter button are controlled by the activity.
            if (v instanceof AbstractIndicatorButton) {
                v.setEnabled(enabled);
            }
        }
        if (mCameraPicker != null) mCameraPicker.setEnabled(enabled);
    }
}