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package net.ulrice.databinding.bufferedbinding.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.ulrice.databinding.bufferedbinding.IFAttributeInfo;
import net.ulrice.databinding.bufferedbinding.IFAttributeModel;
import net.ulrice.databinding.viewadapter.IFViewAdapter;

/**
 * A data group is a set of attribute model gui accessor pairs.
 * 
 * @author christof
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public class BindingGroup extends AbstractBindingGroup {
	
    /** The list of all gui accessors contained in this data group. */
    private final Map> vaMap = new HashMap>();

    /** The list of all attribute models contained in this data group. */
    private final Map amMap = new HashMap();

    /** The set of all changed attribute models. */
    private Set changedSet = new HashSet();

    /** The set of all invalid attribute models. */
    private Set invalidSet = new HashSet();

    protected boolean dirty;
    protected boolean initialized;
    protected boolean valid;

    public BindingGroup() {
        initialized = false;
        valid = true;
        dirty = false;
    }
    

    public void bind(IFAttributeModel attributeModel, IFViewAdapter viewAdapter) {

    	if (!amMap.containsValue(attributeModel)) {
    		addAttributeModel(attributeModel);
    	}
    	
    	if (!vaMap.containsValue(viewAdapter)) {
    		addViewAdapter(attributeModel.getId(), viewAdapter);
    	}    	        
    }
    
    public void unbind(IFAttributeModel attributeModel, IFViewAdapter viewAdapter){
        if (amMap.containsValue(attributeModel)) {
            removeAttributeModel(attributeModel);
        }

        final List viewAdapters = vaMap.get(attributeModel.getId());
        if (viewAdapters != null && viewAdapters.contains(viewAdapter)) {
            removeViewAdapter(attributeModel.getId(), viewAdapter);
        }       
    }
    
    public void unbind(IFAttributeModel attributeModel){
        if (amMap.containsValue(attributeModel)) {
            removeAttributeModel(attributeModel);
        }
        
        final List viewAdapters = new ArrayList(vaMap.get(attributeModel.getId()));
        for (IFViewAdapter viewAdapter : viewAdapters) {
            removeViewAdapter(attributeModel.getId(), viewAdapter);
        }
    }
    
    public void removeAttributeModel(IFAttributeModel am){
        if (am == null) {
            throw new IllegalArgumentException("Could not remove null attribute model.");
        }

        String id = am.getId();
        if (id == null) {
            throw new IllegalStateException("Id of an attribute model must not be null.");
        }
        
        List gaList = vaMap.get(id);
        if (gaList != null) {
            for (IFViewAdapter va : gaList) {
                am.removeViewAdapter(va);
            }
        }
        
        changedSet.remove(id);
        invalidSet.remove(id);
        checkDirtyAndValidStateAndWriteIt();
        
        am.removeAttributeModelEventListener(this);
        amMap.remove(id);
    }
    
    /**
     * Add an attribute model to this data group.
     * 
     * @param am The attribute model.
     */
    public void addAttributeModel(IFAttributeModel am) {
        if (am == null) {
            throw new IllegalArgumentException("Could not add null attribute model.");
        }

        String id = am.getId();
        if (id == null) {
            throw new IllegalStateException("Id of an attribute model must not be null.");
        }

        List gaList = vaMap.get(id);
        if (gaList != null) {
            for (IFViewAdapter va : gaList) {
            	am.addViewAdapter(va);
            }
        }
        
        if(am.isDirty()) {
            changedSet.add(am.getId());
        }
        
        if(!am.isValid()) {
            invalidSet.add(am.getId());
        }
        checkDirtyAndValidStateAndWriteIt();
        
        am.addAttributeModelEventListener(this);
        amMap.put(id, am);
    }

    /**
     * Add a gui accessor to this data group.
     * 
     * @param va The gui accessor.
     */
    public void addViewAdapter(String id, IFViewAdapter va) {
        if (va == null) {
            throw new IllegalArgumentException("Could not add null gui accessor.");
        }

        if (id == null) {
            throw new IllegalStateException("Id of an attribute model must not be null.");
        }

        IFAttributeModel am = amMap.get(id);
        if (am != null) {
        	am.addViewAdapter(va);
        }

        List gaList = vaMap.get(id);
        if (gaList == null) {
            gaList = new LinkedList();
            vaMap.put(id, gaList);
        }
        gaList.add(va);
    }
    
    public void removeViewAdapter(String id, IFViewAdapter va) {
        if (va == null) {
            throw new IllegalArgumentException("Could not add null gui accessor.");
        }

        if (id == null) {
            throw new IllegalStateException("Id of an attribute model must not be null.");
        }

        IFAttributeModel am = amMap.get(id);
        if (am != null) {
            am.removeViewAdapter(va);
        }

        final List viewAdapters = vaMap.get(id);
        if (viewAdapters != null) {
            viewAdapters.remove(va);
        }
    }

    /**
     * Executes read on all attribute models contained in this data group.
     */
    @Override
    public void read() {
        initialized = true;
        valid = true;
        invalidSet.clear();
        dirty = false;
        changedSet.clear();
        
        for (IFAttributeModel am : amMap.values()) {
            am.read();
        }
    }

    /**
     * Executes write on all attribute models contained in this data group.
     */
    @Override
    public void write() {
        for (IFAttributeModel am : amMap.values()) {
            am.write();
        }
    }
    
    @Override
	protected void stateChangedInternal(IFViewAdapter viewAdapter,
			IFAttributeModel amSource) {
    	String id = amSource.getId();
        changedSet.remove(id);
        invalidSet.remove(id);
        
        if(!amSource.isValid()) {
        	invalidSet.add(id);
        }
        
        if(amSource.isDirty()) {
        	changedSet.add(id);
        }

        checkDirtyAndValidStateAndWriteIt();
	}
    
    private void checkDirtyAndValidStateAndWriteIt() {
        dirty = !changedSet.isEmpty();
        valid = invalidSet.isEmpty();		
    }

    @Override
    protected void dataChangedInternal(IFViewAdapter viewAdapter, IFAttributeModel amSource) {
        // ignore
    }

    /**
     * Return the list of all gui accessors contained in this data group.
     * 
     * @return The list of all gui accessors.
     */
    public List getGuiAccessors() {
        List result = new LinkedList();
        if (vaMap != null && !vaMap.isEmpty()) {
            for (List gaList : vaMap.values()) {
                result.addAll(gaList);
            }
        }
        return result;
    }

    /**
     * Return a list of all gui accessors for a specific id.
     * 
     * @param id The identifier.
     * @return The list of all gui accessors.
     */
    public List getGuiAccessors(String id) {
        List result = new LinkedList();
        if (vaMap != null && !vaMap.isEmpty()) {
            List gaList = vaMap.get(id);
            if (null != gaList && !gaList.isEmpty()) {
                result.addAll(gaList);
            }
        }
        return result;
    }

    /**
     * Return the first gui accessor for a specific id.
     * 
     * @param id The identifier.
     * @return The first gui accessor.
     */
    public IFViewAdapter getFirstGuiAccessor(String id) {
        if (vaMap != null && !vaMap.isEmpty()) {
            List gaList = vaMap.get(id);
            return gaList != null && !gaList.isEmpty() ? gaList.get(0) : null;
        }
        return null;
    }

    /**
     * Return a list of all attribute models contained in this data group.
     * 
     * @return The list of all attribute models.
     */
    public List getAttributeModels() {
        List result = new LinkedList();
        if (amMap != null && !amMap.isEmpty()) {
            result.addAll(amMap.values());
        }
        return result;
    }

    /**
     * Return the attribute model for a specific id.
     * 
     * @param id The identifier.
     * @return The attribute model.
     */
    public IFAttributeModel getAttributeModel(String id) {
        return amMap != null ? amMap.get(id) : null;
    }
    
    public IFAttributeInfo getAttributeInfo(String id) {
        IFAttributeModel attributeModel = getAttributeModel(id);
        return attributeModel != null ? attributeModel.getAttributeInfo() : null;
    }
    
    @Override
    public boolean isValid() {
		return valid;
	}
    
    @Override
    public boolean isDirty() {
		return dirty;
	}
    
    public boolean isInitialized() {
		return initialized;
	}

    public void removeAttributeModel(String id) {
        amMap.remove(id);
    }

	public void clear() {
		amMap.clear();
		vaMap.clear();
		changedSet.clear();
		invalidSet.clear();

        initialized = false;
        valid = true;
        dirty = false;
	}
}