package foundation.version;

import foundation.data.meta.field.Field;
import foundation.data.meta.field.FieldsRuntime;
import foundation.util.MapList;
import foundation.util.Util;

public class FieldMappingCreator {
	private MapList<String, Field> fromFields;
	private MapList<String, Field> toFields;
	
	public FieldMappingCreator(MapList<String, Field> fromFields, MapList<String, Field> toFields) {
		this.fromFields = fromFields;
		this.toFields = toFields;
	}

	public static FieldMappingCreator createMapping(FieldsRuntime fromFields, String direction, String versionCode) {
		MapList<String, Field> fromFieldList = new MapList<String, Field>();
		MapList<String, Field> toFieldList = new MapList<String, Field>();
		
		if("HistoryToPreparatory".equalsIgnoreCase(direction)) {
			for (Field field : fromFields) {
				if ("version_data_id".equalsIgnoreCase(field.getName()) || "version_code".equalsIgnoreCase(field.getName())) {
					continue;
				}
				else {
					fromFieldList.add(field.getName(), field);
					toFieldList.add(field.getName(), field);
				}
			}
		}
		else if("PreparatoryToActive".equalsIgnoreCase(direction)) {
			for (Field field : fromFields) {
				fromFieldList.add(field.getName(), field);
				toFieldList.add(field.getName(), field);
			}
		}
		else if("ActiveToHistory".equalsIgnoreCase(direction)) {
			toFieldList.add("version_data_id", new Field("version_data_id"));
			fromFieldList.add("MD5(UUID_SHORT())", new Field("MD5(UUID_SHORT())"));
			
			for (Field field : fromFields) {
				fromFieldList.add(field.getName(), field);
				toFieldList.add(field.getName(), field);
			}
			
			toFieldList.add("version_code", new Field("version_code"));
			fromFieldList.add(Util.quotedStr(versionCode), new Field(Util.quotedStr(versionCode)));
		}
		
		return new FieldMappingCreator(fromFieldList, toFieldList);
	}
	
	public String getFromFields() {
		Field field;
		int length = fromFields.size();
		StringBuffer selectField = new StringBuffer();
		
		for (int i = 0; i < length - 1; i++) {
			field = fromFields.get(i);
			selectField.append(field.getName()).append(", ");
		}
		field = fromFields.get(length - 1);
		selectField.append(field.getName());
		
		return selectField.toString();
	}
	
	public String getToFields() {
		Field field;
		int length = toFields.size();
		StringBuffer insertField = new StringBuffer();
		
		for (int i = 0; i < length - 1; i++) {
			field = toFields.get(i);
			insertField.append(field.getName()).append(", ");
		}
		field = toFields.get(length - 1);
		insertField.append(field.getName());
		
		return insertField.toString();
	}


}