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();
    
    // initialize our search with the master db data
    MasterDatabase db = MasterDatabase.INSTANCE;
    private CourseList query = db.getCourseList();
    private final List<CourseSorter> filters = new ArrayList<CourseSorter>();


    // reset the query
    public void reset()
    {
        query = db.getCourseList();
        clearFilters();
    }

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

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

    // print out the filters we're currently using and the order
    public String printFilters()
    {
        String filterResult = "";

        // no filters? let the user know.
        if(filters.size() == 0)
        {
            return "nothing";
        }

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

        // remove last arrow and add padding
        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 void search(String searchQuery) 
    {
        // only grab courses which fit our search
        List<ICourse> courses = db.getCourseList().getCourses().stream()
            .filter(s -> s.toString().toLowerCase().contains(searchQuery.toLowerCase()))
            .collect(Collectors.toList());

        query.setCourses(courses);
    }
}