package foundation.io.mapping;

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

import foundation.data.meta.field.Field;
import foundation.data.meta.field.FieldsRuntime;
import foundation.io.object.Titles;
import foundation.util.ContentBuilder;

public class MappingsRuntime implements Iterable<FieldMappingRuntime> {
	  
	private List<FieldMappingRuntime> fieldMappingRuntimes;
	private Map<String, FieldMappingRuntime> fromMap;
    private Map<String, FieldMappingRuntime> toMap;
      
    
    public MappingsRuntime() {
    	fieldMappingRuntimes = new ArrayList<FieldMappingRuntime>();
    	fromMap = new HashMap<String, FieldMappingRuntime>();
    	toMap = new HashMap<String, FieldMappingRuntime>();
    }

	public static MappingsRuntime newInstance(FieldsRuntime fromFields, FieldsRuntime toFields) { 
		MappingsRuntime mappingstRuntime = new MappingsRuntime();
        
		FieldMappingRuntime mappingRuntime; Field toField;
		
        for (Field fromField : fromFields) {
        	toField = toFields.get(fromField.getName());
        	
        	if (toField == null) {
        		continue;
        	}
        	
        	mappingRuntime = new FieldMappingRuntime(null, fromField, toField, fromField.getIndexNo(), toField.getIndexNo());
        	mappingstRuntime.addItem(mappingRuntime);
		}
        
		return mappingstRuntime;
	}

	public void addItem(FieldMappingRuntime fieldMappingRuntime) {
		String fromName = fieldMappingRuntime.getFromName();
		String toName = fieldMappingRuntime.getToName();
		
		if (fromName == null || toName == null) {
			return;
		}
		
		fromName = fromName.toLowerCase();
		toName = toName.toLowerCase();
		
		fieldMappingRuntimes.add(fieldMappingRuntime);
		fromMap.put(fromName, fieldMappingRuntime);
		toMap.put(toName, fieldMappingRuntime);
	}
	
	public int[] getFromIndex() {
		int max = fieldMappingRuntimes.size();
		int[] result = new int[max];

		for (int i = 0; i < max; i++) {
			FieldMappingRuntime fieldMappingRuntime = fieldMappingRuntimes.get(i);
			result[i] = fieldMappingRuntime.getFromIndex();
		}
		
		return result;
	}
	
	public int[] getToIndex() {
		int max = fieldMappingRuntimes.size();
		int[] result = new int[max];
		
		for (int i = 0; i < max; i++) {
			FieldMappingRuntime fieldMappingRuntime = fieldMappingRuntimes.get(i);
			result[i] = fieldMappingRuntime.getToIndex();
		}
		
		return result;
	}

	public List<FieldMappingRuntime> getMappingRuntimeList() {
		return fieldMappingRuntimes;
	}

	public Titles getToTitles() {
		Titles result = new Titles();
		
		for (FieldMappingRuntime mappingRuntime: fieldMappingRuntimes) {
			String toTitle = mappingRuntime.getToName();
			int idx = mappingRuntime.getToIndex();
			
			result.add(toTitle, idx);
		}
		
		return result;
	}

	public boolean containsFromField(String fieldName) {
		if (fieldName == null) {
			return false;
		}
		
		fieldName = fieldName.toLowerCase();
		return fromMap.containsKey(fieldName);
	}
	
	public boolean containsToField(String fieldName) {
		if (fieldName == null) {
			return false;
		}
		
		fieldName = fieldName.toLowerCase();
		return toMap.containsKey(fieldName);
	}

	public int size() {
		return fieldMappingRuntimes.size();
	}
	
	public String getFromFieldNames(String division) {
		ContentBuilder result = new ContentBuilder(division);
		
		for (FieldMappingRuntime fieldMappingRuntime: fieldMappingRuntimes) {
			String fromName = fieldMappingRuntime.getFromName();
			result.append(fromName);
		}
		
		return result.toString();
	}
	
	public String getToFieldNames(String division, String... additional) {
		ContentBuilder result = new ContentBuilder(division);
		
		for (FieldMappingRuntime fieldMappingRuntime: fieldMappingRuntimes) {
			String toName = fieldMappingRuntime.getToName();
			result.append(toName);
		}
		
		if (additional != null) {
			for (String fieldName: additional) {
				result.append(fieldName);
			}
		}
		
		return result.toString();
	}

	@Override
	public Iterator<FieldMappingRuntime> iterator() {
		return fieldMappingRuntimes.iterator();
	}

}