/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.sling.feature.extension.apiregions.api.config;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.json.Json;
import javax.json.JsonArrayBuilder;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.json.JsonValue;

import org.apache.felix.cm.json.Configurations;

/** 
 * A configurable entity has properties
 * This class is not thread safe.
 */
public abstract class ConfigurableEntity extends DescribableEntity {
	
    /** The properties */
    @SuppressWarnings({"unchecked", "rawtypes"})
    private final Map<String, PropertyDescription> properties = (Map)Configurations.newConfiguration();

    /** 
     * The validation mode. 
     * @since 1.2
     */
    private Mode mode;
    
    /** 
     * Allow additional properties
     * @since 1.4
     */
    private boolean allowAdditional;
    
    /** 
     * The region
     * @since 1.4
     */
    private Region region;

    /** 
     * 
     * @since 1.4
     */
    private final List<String> internalProperties = new ArrayList<>();

    void setDefaults() {
        super.setDefaults();
        this.setAllowAdditionalProperties(false);
        this.setRegion(Region.GLOBAL);
    }

    /**
     * Clear the object and reset to defaults
     */
    @Override
	public void clear() {
        super.clear();
		this.properties.clear();
        this.setMode(null);
        this.getInternalPropertyNames().clear();
    }

	/**
	 * Extract the metadata from the JSON object.
	 * This method first calls {@link #clear()}
     * 
	 * @param jsonObj The JSON Object
	 * @throws IOException If JSON parsing fails
	 */
    @Override
	public void fromJSONObject(final JsonObject jsonObj) throws IOException {
        super.fromJSONObject(jsonObj);
        try {
            JsonValue val = this.getAttributes().remove(InternalConstants.KEY_PROPERTIES);
            if ( val != null ) {
                for(final Map.Entry<String, JsonValue> innerEntry : val.asJsonObject().entrySet()) {
					final PropertyDescription prop = new PropertyDescription();
					prop.fromJSONObject(innerEntry.getValue().asJsonObject());
                    if ( this.getPropertyDescriptions().put(innerEntry.getKey(), prop) != null )  {
                        throw new IOException("Duplicate key for property description (keys are case-insensitive) : ".concat(innerEntry.getKey()));
                    }
                }
            }            
			final String modeVal = this.getString(InternalConstants.KEY_MODE);
			if ( modeVal != null ) {
                this.setMode(Mode.valueOf(modeVal.toUpperCase()));				
			}
            final String regionVal = this.getString(InternalConstants.KEY_REGION);
            if ( regionVal != null ) {
                this.setRegion(Region.valueOf(regionVal.toUpperCase()));				
            }
			this.setAllowAdditionalProperties(this.getBoolean(InternalConstants.KEY_ALLOW_ADDITIONAL_PROPERTIES, this.isAllowAdditionalProperties()));
            val = this.getAttributes().remove(InternalConstants.KEY_INTERNAL_PROPERTIES);
            if ( val != null ) {
                for(final JsonValue v : val.asJsonArray()) {
                    this.getInternalPropertyNames().add(getString(v));
                }
            }
        } catch (final JsonException | IllegalArgumentException e) {
            throw new IOException(e);
        }
	}

	/**
	 * Get the properties
	 * @return Mutable map of properties by property name
	 */
    public Map<String, PropertyDescription> getPropertyDescriptions() {
        return this.properties;
    }

    /**
     * Get the validation mode.
     * @return The mode or {@code null}
     * @since 1.2
     */
    public Mode getMode() {
        return this.mode;
    }

    /**
     * Set the validation mode
     * @param value The validation mode
     * @since 1.2
     */
    public void setMode(final Mode value) {
        this.mode = value;
    }

    /**
     * Are additional properties allowed?
     * @return {@code true} if additional properties are allowed
     * @since 1.4
     */
    public boolean isAllowAdditionalProperties() {
        return allowAdditional;
    }

    /**
     * Set whether additional properties are allowed
     * @param flag Set to {@code true} to allow additional properties
     * @since 1.4
     */
    public void setAllowAdditionalProperties(final boolean flag) {
        this.allowAdditional = flag;
    }

    /**
     * Which region does this entity apply to?
     * @return the region
     * @since 1.4
     */
    public Region getRegion() {
        return this.region;
    }

    /**
     * Set the region of this entity.
     * @param region The region
     * @since 1.4
     */
    public void setRegion(final Region region) {
        this.region = region == null ? Region.GLOBAL : region;
    }

    /**
     * Get the list of internal property names.
     * @return the mutable list of internal property names
     * @since 1.4
     */
    public List<String> getInternalPropertyNames() {
        return internalProperties;
    }

    /**
     * Convert this object into JSON
     *
     * @return The json object builder
     * @throws IOException If generating the JSON fails
     */
    @Override
	JsonObjectBuilder createJson() throws IOException {
		final JsonObjectBuilder objBuilder = super.createJson();

		if ( !this.getPropertyDescriptions().isEmpty() ) {
			final JsonObjectBuilder propBuilder = Json.createObjectBuilder();
			for(final Map.Entry<String, PropertyDescription> entry : this.getPropertyDescriptions().entrySet()) {
				propBuilder.add(entry.getKey(), entry.getValue().createJson());
			}
			objBuilder.add(InternalConstants.KEY_PROPERTIES, propBuilder);
		}
        if ( this.getMode() != null ) {
            objBuilder.add(InternalConstants.KEY_MODE, this.getMode().name());
        }
        if ( this.getRegion() != Region.GLOBAL ) {
            objBuilder.add(InternalConstants.KEY_REGION, this.getRegion().name());
        }
		if ( this.isAllowAdditionalProperties() ) {
			objBuilder.add(InternalConstants.KEY_ALLOW_ADDITIONAL_PROPERTIES, this.isAllowAdditionalProperties());
		}
        if ( !this.getInternalPropertyNames().isEmpty() ) {
            final JsonArrayBuilder arrayBuilder = Json.createArrayBuilder();
            for(final String name : this.getInternalPropertyNames()) {
                arrayBuilder.add(name);
            }
            objBuilder.add(InternalConstants.KEY_INTERNAL_PROPERTIES, arrayBuilder);
        }
 
		return objBuilder;
   }
}