package frame.object.data;

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

import chat.server.call.IJSONWriter;
import chat.server.call.IJsonProvider;
import frame.object.meta.EntityMeta;


public class EntitySet implements Iterable<Entity>, IJsonProvider {

	protected EntityMeta entityMeta;
	protected List<Entity> entityList;
	protected int maxSize;
	protected Indexes indexes;

	
	public EntitySet(EntityMeta tableMeta) {
		this(tableMeta, -1);
	}

	public EntitySet(EntityMeta entityMeta, int maxSize) {
		this.entityMeta = entityMeta;
		
		if (maxSize > 0) {
			this.maxSize = maxSize;
			entityList = new ArrayList<Entity>(maxSize);
		}
		else {
			entityList = new ArrayList<Entity>(15);
		}
		
		indexes = new Indexes(this);
	}

	public Entity newEntity() {
		Entity entity = new Entity(entityMeta);
		return entity;
	}
	
	public Entity append() {
		Entity entity = new Entity(entityMeta);
		entityList.add(entity);

		return entity;
	}
	
	public Entity append(Entity entity) {
		entityList.add(entity);
		indexes.setDirty();
		
		return entity;
	}

	public Entity getEntity(int idx) {
		Entity entity = entityList.get(idx);
		
		if (entity == null || entity.isDeleted()) {
			return null;
		}
		
		return entity;
	}
	
	public Entity getEntity(ID id) throws DataException {
		if (id == null) {
			return null;
		}
		
		Entity entity = indexes.getEntity("id", id.getValue());
		
		if (entity == null || entity.isDeleted()) {
			return null;
		}
		
		return entity;
	}
	
	public Entity getEntity(String field, Object value) throws DataException {
		if (field == null) {
			return null;
		}
		
		Entity entity =  indexes.getEntity(field, value);
		
		if (entity == null || entity.isDeleted()) {
			return null;
		}
		
		return entity;
	}
	
	public void delete(ID id) throws DataException {
		if (id == null) {
			return;
		}
		
		Entity entity = indexes.getEntity("id", id.getValue());
		
		if (entity == null) {
			return;
		}
		
		entity.setDeleted();
	}
	
	public void clear() {
		entityList.clear();
	}

	public boolean isEmpty() {
		return entityList.isEmpty();
	}
	
	public boolean isFull() {
		return entityList.size() >= maxSize;
	}
	
	public String getTableName() {
		return entityMeta.getTableName();
	}

	public int getFieldCount() {
		return entityMeta.getFieldCount();
	}

	public EntityMeta getEntityMeta() {
		return entityMeta;
	}

	public List<Entity> getEntityList() {
		return entityList;
	}



	@Override
	public Iterator<Entity> iterator() {
		return new EntitySetIterator(this);
	}

	public int size() {
		return entityList.size();
	}

	public String[] getLowerNames() {
		return entityMeta.getLowerNames();
	}

	@Override
	public void writeJSONObject(IJSONWriter writer) {
		writer.beginArray();
		writeJSONData(writer);
		writer.endArray();		
	}

	@Override
	public void writeJSONData(IJSONWriter writer) {
		int lineIndex = 0; int lineNo = 1;
		
		for (Entity entity : this) {
			writer.beginObject();
			
			writer.write("lineIndex", lineIndex++);
			writer.write("lineNo", lineNo++);
			
			entity.writeJSONData(writer);
			
			writer.endObject();
		}		
	}

}