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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.time.Instant;
import java.util.Map;
import java.util.Set;

public class HubRankTest {

  /** 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;

  Holder don = new Holder(1, "Don");
  Holder mitch = new Holder(2, "Mitch");
  Holder nancy = new Holder(3, "Nancy");
  Holder midge = new Holder(4, "Midge");
  Holder bob = new Holder(5, "Bob");
  Holder jane = new Holder(6, "Jane");

  @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 testEmptyDB(){
    try{
      db = new DatabaseQuerier("data/testing/empty.sqlite3");
    } catch(Exception e){
      System.out.println("DBQuerier Test, couldn't connect to db???");
    }
    LinkMapper lm = new LinkMapper(db);
    HubSearch hub = new HubSearch(lm);
    Map<Holder, Double> hubRanks = hub.runHubSearch(start, end);
    assertTrue(hubRanks.isEmpty());
    tearDown();
  }

  @Test
  public void flippedDates(){
    setUp();
    LinkMapper lm = new LinkMapper(db);
    HubSearch hub = new HubSearch(lm);
    Map<Holder, Double> hubRanks = hub.runHubSearch(end, start);
    assertTrue(hubRanks.isEmpty());
    tearDown();

  }

  @Test
  public void testHubRankSmall(){
    setUp();
    LinkMapper lm = new LinkMapper(db);
    HubSearch hub = new HubSearch(lm);
    Map<Holder, Double> hubRanks = hub.runHubSearch(start, end);
    assertEquals(6, hubRanks.size());
    tearDown();
  }

  @Test
  public void testCheckRightValues(){
    setUp();
    LinkMapper lm = new LinkMapper(db);
    HubSearch hub = new HubSearch(lm);
    Map<Holder, Double> hubRanks = hub.runHubSearch(start, end);

    System.out.println(hubRanks);
    assertTrue(hubRanks.get(mitch) > hubRanks.get(don));
    assertTrue(hubRanks.get(don) > hubRanks.get(bob));
    assertTrue(hubRanks.get(bob) > hubRanks.get(nancy));
    assertTrue(hubRanks.get(nancy)> hubRanks.get(jane));
    assertTrue(hubRanks.get(nancy) > hubRanks.get(midge));

    tearDown();
  }

  @Test
  public void testFollowersSetsConstructedProperly(){
    setUp();
    LinkMapper lm = new LinkMapper(db);
    HubSearch hub = new HubSearch(lm);
    Map<Holder, Double> hubRanks = hub.runHubSearch(start, end);

    for(Holder person: hubRanks.keySet()){
      System.out.println(person.getName() + " " + person.getFollowers());
      if(person.equals(don)) {
        assertTrue(person.getFollowers().contains(mitch));
        assertTrue(person.getFollowers().contains(nancy));
        assertTrue(person.getFollowers().contains(midge));
      } else if(person.equals(bob)){
        assertTrue(person.getFollowers().contains(mitch));
        assertTrue(person.getFollowers().contains(midge));
      } else if(person.equals(nancy)){
        assertTrue(person.getFollowers().contains(midge));
      } else if(person.equals(mitch)){
        assertTrue(person.getFollowers().contains(nancy));
        assertTrue(person.getFollowers().contains(midge));
        assertTrue(person.getFollowers().contains(bob));
      } else{
        assertTrue(person.getFollowers().isEmpty());
      }
    }

    tearDown();
  }

  //TODO: Test special case where all the hub ranks should be the same
}