package design.model.course_search;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import design.persistence.MasterDatabase;

/* 
 * Represents the state of our current search.
 */
public class CurrentSearchQuery {
    public static final CurrentSearchQuery INSTANCE = new CurrentSearchQuery();
    

    private CourseList query;
    MasterDatabase db = MasterDatabase.INSTANCE;
    private final List<CourseSorter> filters = new ArrayList<CourseSorter>();


    // initialize the query to the master DB
    public void initialize()
    {
        query = db.getCourseList();
    }

    // add a new filter
    public void addFilter(CourseSorter filter)
    {
        filters.add(filter);
    }

    // clear the filters
    public void clearFilters()
    {
        filters.clear();
    }

    // print out the filters ( this is for the model checking used filters )
    public String printFilters()
    {
        String filterResult = "";

        if(filters.size() == 0)
        {
            return "nothing";
        }

        for( CourseSorter f : filters)
        {
            filterResult += f.toString() + " --> ";
        }

        filterResult = filterResult.substring(0, filterResult.length() - 5);
        filterResult += "\n";

        return filterResult;
    }

    // get all the filters
    public List<CourseSorter> getFilters()
    {
        return filters;
    }

    // get our current query.
    public CourseList getQueryResult()
    {
        return query;
    }

    public CourseList search(String[] searchQuery)
    {
        List<ICourse> courses = query.getCourses();

        courses = courses.stream()
                            .filter(s -> s.toString().toLowerCase().contains(searchQuery[0].toLowerCase()))
                            .collect(Collectors.toList());

        query.setCourses(courses);
        
        return query;
    }
}