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/**

 * Copyright 2010-present Facebook.

 *

 * 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.facebook.internal;

import android.os.Bundle;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import java.util.*;

/**

 * com.facebook.internal is solely for the use of other packages within the Facebook SDK for Android. Use of

 * any of the classes in this package is unsupported, and they may be modified or removed without warning at

 * any time.

 */

/**

 * A helper class that can round trip between JSON and Bundle objects that contains the types:

 *   Boolean, Integer, Long, Double, String

 * If other types are found, an IllegalArgumentException is thrown.

 */

public class BundleJSONConverter {

    private static final Map<Class<?>, Setter> SETTERS = new HashMap<Class<?>, Setter>();

    static {

        SETTERS.put(Boolean.class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                bundle.putBoolean(key, (Boolean) value);

            }

            public void setOnJSON(JSONObject json, String key, Object value)  throws JSONException {

                json.put(key, value);

            }

        });

        SETTERS.put(Integer.class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                bundle.putInt(key, (Integer) value);

            }

            public void setOnJSON(JSONObject json, String key, Object value)  throws JSONException {

                json.put(key, value);

            }

        });

        SETTERS.put(Long.class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                bundle.putLong(key, (Long) value);

            }

            public void setOnJSON(JSONObject json, String key, Object value)  throws JSONException {

                json.put(key, value);

            }

        });

        SETTERS.put(Double.class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                bundle.putDouble(key, (Double) value);

            }

            public void setOnJSON(JSONObject json, String key, Object value)  throws JSONException {

                json.put(key, value);

            }

        });

        SETTERS.put(String.class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                bundle.putString(key, (String) value);

            }

            public void setOnJSON(JSONObject json, String key, Object value)  throws JSONException {

                json.put(key, value);

            }

        });

        SETTERS.put(String[].class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                throw new IllegalArgumentException("Unexpected type from JSON");

            }

            public void setOnJSON(JSONObject json, String key, Object value)  throws JSONException {

                JSONArray jsonArray = new JSONArray();

                for (String stringValue : (String[])value) {

                    jsonArray.put(stringValue);

                }

                json.put(key, jsonArray);

            }

        });

        SETTERS.put(JSONArray.class, new Setter() {

            public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException {

                JSONArray jsonArray = (JSONArray)value;

                ArrayList<String> stringArrayList = new ArrayList<String>();

                // Empty list, can't even figure out the type, assume an ArrayList<String>

                if (jsonArray.length() == 0) {

                    bundle.putStringArrayList(key, stringArrayList);

                    return;

                }

                // Only strings are supported for now

                for (int i = 0; i < jsonArray.length(); i++) {

                    Object current = jsonArray.get(i);

                    if (current instanceof String) {

                        stringArrayList.add((String)current);

                    } else {

                        throw new IllegalArgumentException("Unexpected type in an array: " + current.getClass());

                    }

                }

                bundle.putStringArrayList(key, stringArrayList);

            }

            @Override

            public void setOnJSON(JSONObject json, String key, Object value) throws JSONException {

                throw new IllegalArgumentException("JSONArray's are not supported in bundles.");

            }

        });

    }

    public interface Setter {

        public void setOnBundle(Bundle bundle, String key, Object value) throws JSONException;

        public void setOnJSON(JSONObject json, String key, Object value) throws JSONException;

    }

    public static JSONObject convertToJSON(Bundle bundle) throws JSONException {

        JSONObject json = new JSONObject();

        for(String key : bundle.keySet()) {

            Object value = bundle.get(key);

            if (value == null) {

                // Null is not supported.

                continue;

            }

            // Special case List<String> as getClass would not work, since List is an interface

            if (value instanceof List<?>) {

                JSONArray jsonArray = new JSONArray();

                @SuppressWarnings("unchecked")

                List<String> listValue = (List<String>)value;

                for (String stringValue : listValue) {

                    jsonArray.put(stringValue);

                }

                json.put(key, jsonArray);

                continue;

            }

            // Special case Bundle as it's one way, on the return it will be JSONObject

            if (value instanceof Bundle) {

                json.put(key, convertToJSON((Bundle)value));

                continue;

            }

            Setter setter = SETTERS.get(value.getClass());

            if (setter == null) {

                throw new IllegalArgumentException("Unsupported type: " + value.getClass());

            }

            setter.setOnJSON(json, key, value);

        }

        return json;

    }

    public static Bundle convertToBundle(JSONObject jsonObject) throws JSONException {

        Bundle bundle = new Bundle();

        @SuppressWarnings("unchecked")

        Iterator<String> jsonIterator = jsonObject.keys();

        while (jsonIterator.hasNext()) {

            String key = jsonIterator.next();

            Object value = jsonObject.get(key);

            if (value == null || value == JSONObject.NULL) {

                // Null is not supported.

                continue;

            }

            // Special case JSONObject as it's one way, on the return it would be Bundle.

            if (value instanceof JSONObject) {

                bundle.putBundle(key, convertToBundle((JSONObject)value));

                continue;

            }

            Setter setter = SETTERS.get(value.getClass());

            if (setter == null) {

                throw new IllegalArgumentException("Unsupported type: " + value.getClass());

            }

            setter.setOnBundle(bundle, key, value);

        }

        return bundle;

    }

}