/*
 * 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.camera.app;

import android.content.Context;
import android.util.SparseArray;

import com.android.camera.debug.Log;
import com.android.camera.settings.SettingsManager;
import com.android.camera2.R;

import java.util.ArrayList;
import java.util.List;

/**
 * A class which implements {@link com.android.camera.app.ModuleManager}.
 */
public class ModuleManagerImpl implements ModuleManager {
    private static final Log.Tag TAG = new Log.Tag("ModuleManagerImpl");

    private final SparseArray<ModuleAgent> mRegisteredModuleAgents = new
            SparseArray<ModuleAgent>(2);
    private int mDefaultModuleId = MODULE_INDEX_NONE;

    public ModuleManagerImpl() {
    }

    @Override
    public void registerModule(ModuleAgent agent) {
        if (agent == null) {
            throw new NullPointerException("Registering a null ModuleAgent.");
        }
        final int moduleId = agent.getModuleId();
        if (moduleId == MODULE_INDEX_NONE) {
            throw new IllegalArgumentException(
                    "ModuleManager: The module ID can not be " + "MODULE_INDEX_NONE");
        }
        if (mRegisteredModuleAgents.get(moduleId) != null) {
            throw new IllegalArgumentException("Module ID is registered already:" + moduleId);
        }
        mRegisteredModuleAgents.put(moduleId, agent);
    }

    @Override
    public boolean unregisterModule(int moduleId) {
        if (mRegisteredModuleAgents.get(moduleId) == null) {
            return false;
        }
        mRegisteredModuleAgents.delete(moduleId);
        if (moduleId == mDefaultModuleId) {
            mDefaultModuleId = -1;
        }
        return true;
    }

    @Override
    public List<ModuleAgent> getRegisteredModuleAgents() {
        List<ModuleAgent> agents = new ArrayList<ModuleAgent>();
        for (int i = 0; i < mRegisteredModuleAgents.size(); i++) {
            agents.add(mRegisteredModuleAgents.valueAt(i));
        }
        return agents;
    }

    @Override
    public List<Integer> getSupportedModeIndexList() {
        List<Integer> modeIndexList = new ArrayList<Integer>();
        for (int i = 0; i < mRegisteredModuleAgents.size(); i++) {
            modeIndexList.add(mRegisteredModuleAgents.keyAt(i));
        }
        return modeIndexList;
    }

    @Override
    public boolean setDefaultModuleIndex(int moduleId) {
        if (mRegisteredModuleAgents.get(moduleId) != null) {
            mDefaultModuleId = moduleId;
            return true;
        }
        return false;
    }

    @Override
    public int getDefaultModuleIndex() {
        return mDefaultModuleId;
    }

    @Override
    public ModuleAgent getModuleAgent(int moduleId) {
        ModuleAgent agent = mRegisteredModuleAgents.get(moduleId);
        if (agent == null) {
            return mRegisteredModuleAgents.get(mDefaultModuleId);
        }
        return agent;
    }

    @Override
    public int getQuickSwitchToModuleId(int moduleId, SettingsManager settingsManager,
            Context context) {
        final int photoModuleId = context.getResources().getInteger(R.integer.camera_mode_photo);
        final int videoModuleId = context.getResources().getInteger(R.integer.camera_mode_video);

        int quickSwitchTo = moduleId;
        if (moduleId == photoModuleId
            || moduleId == context.getResources().getInteger(R.integer.camera_mode_gcam)) {
            // Quick switch from camera to video.
            quickSwitchTo = videoModuleId;
        } else if (moduleId == videoModuleId) {
            // Quick switch from video to last used camera (i.e. simple camera or hdr+)
            quickSwitchTo = settingsManager.getInt(
                    SettingsManager.SETTING_KEY_CAMERA_MODULE_LAST_USED_INDEX);
        }

        if (mRegisteredModuleAgents.get(quickSwitchTo) != null) {
            return quickSwitchTo;
        } else {
            return moduleId;
        }
    }

}