package edu.brown.cs.student;

import edu.brown.cs.student.term.DatabaseQuerier;
import edu.brown.cs.student.term.hub.Holder;
import edu.brown.cs.student.term.hub.HubSearch;
import edu.brown.cs.student.term.hub.LinkMapper;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.time.Instant;
import java.util.Map;
import java.util.Set;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;


public class LinkMapperTest {

  /** these should span the entire mock dataset */
  //12 am on 3/11 in UTC
  private Instant start = Instant.parse("2021-03-11T05:00:00.00Z");
  //12 am on 3/28 in UTC
  private Instant end = Instant.parse("2021-03-28T05:00:00.00Z");

  private DatabaseQuerier db;

  @Before
  public void setUp() {
    try{
      db = new DatabaseQuerier("data/lil_mock.sqlite3");
    } catch(Exception e){
      System.out.println("DBQuerier Test, couldn't connect to db???");
    }
  }

  @After
  public void tearDown() {
    db = null;
  }

  @Test
  public void testBasicMapper(){
    setUp();
    LinkMapper lm = new LinkMapper(db);
    Map<Holder, Set<Holder>> linkMap = lm.makeFollowerLinks(start, end);
    //should be one for each person in little mock (6)
    assertEquals(6, linkMap.keySet().size());

    for(Holder h: linkMap.keySet()){
      //didn't follow anyone elses trades
      if(h.getName().equals("Don") || h.getName().equals("Jane")){
        assertTrue(linkMap.get(h).isEmpty());
        //biggest follower
      } else if(h.getName().equals("Midge")){
        assertEquals(4, linkMap.get(h).size());
      } else if(h.getName().equals("Nancy") || h.getName().equals("Mitch")){
        assertEquals(2, linkMap.get(h).size());
      } else {
        //should be Bob, only followed Mitch
        assertEquals(1, linkMap.get(h).size());
      }
    }
    tearDown();
  }

  @Test
  public void testBadDate(){
    setUp();
    LinkMapper lm = new LinkMapper(db);
    Map<Holder, Set<Holder>> linkMap = lm.makeFollowerLinks(end, start);
    assertTrue(linkMap.isEmpty());
    tearDown();
  }

  @Test
  public void testEmptyDB(){
    try{
      db = new DatabaseQuerier("data/empty.sqlite3");
    } catch(Exception e){
      System.out.println("DBQuerier Test, couldn't connect to db???");
    }
    LinkMapper lm = new LinkMapper(db);
    Map<Holder, Set<Holder>> linkMap = lm.makeFollowerLinks(start, end);
    //should be one for each person in little mock (6)
    assertTrue(linkMap.isEmpty());

  }

}