package pt.utl.ist.fenix.tools.file;

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

import pt.utl.ist.fenix.tools.file.FilesetMetadataQuery.ConjunctionType;
import pt.utl.ist.fenix.tools.file.FilesetMetadataQuery.MetadataQuery;
import pt.utl.ist.fenix.tools.util.StringNormalizer;

public class FileSearchCriteria {
	
	private static final int proximityRange = 10;
	
	FilesetMetadataQuery query; 
	
	public FileSearchCriteria() {
		this(0,15);
	}
	
	public FileSearchCriteria(int start, int pageSize) {
		query = new FilesetMetadataQuery();
		query.setStart(start);
		query.setPageSize(pageSize);
	}
	
	public FilesetMetadataQuery getQuery() {
		return query;
	}
	
	public static FilesetMetadataQuery searchByAuthor(String name) {
		FileSearchCriteria searchObject = new FileSearchCriteria();
		searchObject.addAndCriteria(SearchField.AUTHOR, name);
		return searchObject.getQuery();
	}
	
	public static FilesetMetadataQuery searchByTitle(String title) {
		FileSearchCriteria searchObject = new FileSearchCriteria();
		searchObject.addOrCriteria(SearchField.TITLE, title);
		return searchObject.getQuery();
	}
	
	public void addCriteria(SearchField criteria, String value) {
		addAndCriteria(criteria, value);
	}

	public void addAndCriteria(SearchField criteria, String value) {
		if(value!=null && value.length()>0) { 
			query.addNextQuery(criteria.fieldName(), "\"" + StringNormalizer.normalize(value) + "\"~" + proximityRange, ConjunctionType.AND);
		}
	}
	
	public void addOrCriteria(SearchField criteria, String value) {
		if(value!=null && value.length()>0) {
			query.addToPreviousQuery(ConjunctionType.OR,criteria.fieldName(), "\"" + StringNormalizer.normalize(value) + "\"~" + proximityRange);
		}
	}
	
	public void addExactMatchAndCriteria(SearchField criteria, String value) { 
		if(value!=null && value.length()>0) { 
			query.addNextQuery(criteria.fieldName(), "\"" + StringNormalizer.normalize(value) + "\"", ConjunctionType.AND);
		}
	}
	
	public void addExactMatchOrCriteria(SearchField criteria, String value) {
		if(value!=null && value.length()>0) {
			query.addToPreviousQuery(ConjunctionType.OR,criteria.fieldName(), "\"" + StringNormalizer.normalize(value) + "\"");
		}
	}
	
	public static enum SearchField {
		AUTHOR ("author"),
		COURSE("author"), // on executionCourses the author of the file is the course
		TITLE ("title"),
		KEYWORD("keyword"),		
		DATE ("date"),
		PUBLISHER("publisher"),
		DESCRIPTION("description"),
		TYPE("type"),
		INFORMATIONS("informations"),
		UNIT("unit"),
		ANY(MetadataQuery.ANY_FIELD);
		
		
		private String field;
		
		private SearchField(String name) {
			field = name;
		}
		
		public String fieldName() {
			return field;
		}
		
		public static List<SearchField> getSearchFieldsInResearchPublications() {
			List<SearchField> fields = new ArrayList<SearchField>();
			fields.add(SearchField.AUTHOR);
			fields.add(SearchField.TITLE);
			fields.add(SearchField.DATE);
			fields.add(SearchField.PUBLISHER);
			fields.add(SearchField.DESCRIPTION);
			fields.add(SearchField.ANY);
			return fields;
		}
		
	}
	
}