/*
 *  Copyright 2018 Anyware Services
 *
 *  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 org.ametys.runtime.model;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.cocoon.ProcessingException;

import org.ametys.runtime.config.DisableCondition;
import org.ametys.runtime.config.DisableConditions;
import org.ametys.runtime.i18n.I18nizableText;
import org.ametys.runtime.model.type.ElementType;
import org.ametys.runtime.model.type.ModelItemType;
import org.ametys.runtime.parameter.Validator;

/**
 * The definition of a single model item (parameter, attribute)
 * @param <T> Type of the element value
 */
public class ElementDefinition<T> extends AbstractModelItem
{
    private String _pluginName;
    private ElementType<T> _type;
    private String _widget;
    private Map<String, I18nizableText> _widgetParams;
    private Enumerator<T> _enumerator;
    private Validator _validator;
    private T _defaultValue;
    private boolean _isMultiple;
    private DisableConditions _disableConditions;
    
    /**
     * Retrieves the name of the plugin declaring this element.
     * @return the plugin name.
     */
    public String getPluginName()
    {
        return _pluginName;
    }

    /**
     * Set the name of the plugin declaring this element.
     * @param pluginName the plugin name.
     */
    public void setPluginName(String pluginName)
    {
        _pluginName = pluginName;
    }

    @Override
    public ElementType<T> getType()
    {
        return _type;
    }

    @SuppressWarnings("unchecked")
    public void setType(ModelItemType type)
    {
        if (type instanceof ElementType)
        {
            _type = (ElementType<T>) type;
        }
        else
        {
            throw new IllegalArgumentException("Unable to set the type '" + type.getClass() + "' on the element type '" + getName() + "'");
        }
    }

    /**
     * Retrieves the widget to use for rendering.
     * @return the widget or <code>null</code> if none is defined.
     */
    public String getWidget()
    {
        return _widget;
    }

    /**
     * Set the widget.
     * @param widget the widget.
     */
    public void setWidget(String widget)
    {
        _widget = widget;
    }
    
    /**
     * Get the widget's parameters
     * @return the widget's parameters
     */
    public Map<String, I18nizableText> getWidgetParameters()
    {
        return _widgetParams;
    }
    
    /**
     * Set the widget's parameters
     * @param params the parameters to set
     */
    public void setWidgetParameters (Map<String, I18nizableText> params)
    {
        _widgetParams = params;
    }
    
    /**
     * Retrieves the enumerator.
     * @return the enumerator or <code>null</code> if none is defined.
     */
    public Enumerator<T> getEnumerator()
    {
        return _enumerator;
    }

    /**
     * Set the enumerator.
     * @param enumerator the enumerator.
     */
    public void setEnumerator(Enumerator<T> enumerator)
    {
        _enumerator = enumerator;
    }

    /**
     * Retrieves the validator.
     * @return the validator or <code>null</code> if none is defined.
     */
    public Validator getValidator()
    {
        return _validator;
    }

    /**
     * Set the validator.
     * @param validator the validator.
     */
    public void setValidator(Validator validator)
    {
        _validator = validator;
    }

    /**
     * Retrieves the default value.
     * @return the default value or <code>null</code> if none is defined.
     */
    public T getDefaultValue()
    {
        return _defaultValue;
    }

    /**
     * Set the default value.
     * @param defaultValue the default value.
     */
    public void setDefaultValue(T defaultValue)
    {
        _defaultValue = defaultValue;
    }

    /**
     * Test if the element is multiple.
     * @return <code>true</code> if the metadata is multiple.
     */
    public boolean isMultiple()
    {
        return _isMultiple;
    }
    
    /**
     * Set the element multiple status.
     * @param isMultiple the element multiple status.
     */
    public void setMultiple(boolean isMultiple)
    {
        _isMultiple = isMultiple;
    }
    
    /**
     * Retrieves the disable condition.
     * @return the disable condition or <code>null</code> if none is defined.
     */
    public DisableConditions getDisableConditions()
    {
        return _disableConditions;
    }

    /**
     * Sets the disable condition.
     * @param disableConditions the disable condition.
     */
    public void setDisableConditions(DisableConditions disableConditions)
    {
        _disableConditions = disableConditions;
    }

    @Override
    public Map<String, Object> toJSON() throws ProcessingException
    {
        Map<String, Object> result = super.toJSON();
        
        result.put("plugin", getPluginName());
        result.put("multiple", isMultiple());
        
        if (getType() != null)
        {
            result.put("type", getType().getId());
            result.put("default-value", getType().valueToJSONForClient(getDefaultValue()));
        }
        
        
        if (getValidator() != null)
        {
            result.put("validation", getValidator().getConfiguration());
        }
        
        if (getEnumerator() != null)
        {
            List<Map<String, Object>> enumeration = new ArrayList<>();
            
            try
            {
                Map<T, I18nizableText> entries = getEnumerator().getTypedEntries();
                for (Map.Entry<T, I18nizableText> entry : entries.entrySet())
                {
                    Map<String, Object> option = new HashMap<>();
                    option.put("value", getType().valueToJSONForClient(entry.getKey()));
                    option.put("label", entry.getValue());
                    enumeration.add(option);
                }
            }
            catch (Exception e)
            {
                throw new ProcessingException("Unable to enumerate entries with enumerator: " + getEnumerator(), e);
            }
            
            result.put("enumeration", enumeration);
            result.put("enumerationConfig", getEnumerator().getConfiguration());
        }
        
        result.put("widget", getWidget());
        
        Map<String, I18nizableText> widgetParameters = getWidgetParameters();
        if (widgetParameters != null && !widgetParameters.isEmpty())
        {
            result.put("widget-params", widgetParameters);
        }
        
        if (getDisableConditions() != null)
        {
            result.put("disableCondition", _disableConditionstoJSON(getDisableConditions()));
        }
        
        return result;
    }
    
    /**
     * Converts the definition's disable conditions in a JSON map
     * @param disableConditions the disable conditions to convert
     * @return The definition's disable conditions as a JSON map
     */
    private Map<String, Object> _disableConditionstoJSON(DisableConditions disableConditions)
    {
        Map<String, Object> map = new HashMap<>();
        
        // Handle simple conditions
        List<Map<String, String>> disableConditionList = new ArrayList<>();
        map.put("condition", disableConditionList);
        for (DisableCondition disableCondition : disableConditions.getConditions())
        {
            Map<String, String> disableConditionAsMap = _disableConditiontoJSON(disableCondition);
            disableConditionList.add(disableConditionAsMap);
        }

        // Handle nested conditions
        List<Map<String, Object>> disableConditionsList = new ArrayList<>();
        map.put("conditions", disableConditionsList);
        for (DisableConditions subDisableConditions : disableConditions.getSubConditions())
        {
            Map<String, Object> disableConditionsAsMap = _disableConditionstoJSON(subDisableConditions);
            disableConditionsList.add(disableConditionsAsMap);
        }
        
        // Handle type
        map.put("type", disableConditions.getAssociationType().toString().toLowerCase());
        
        return map; 
    }

    private static Map<String, String> _disableConditiontoJSON(DisableCondition disableCondition)
    {
        Map<String, String> map = new HashMap<>();
        map.put("id", disableCondition.getId());
        map.put("operator", disableCondition.getOperator().toString().toLowerCase());
        map.put("value", disableCondition.getValue());
        return map;
    }
}