package edu.brown.cs.student;

import java.time.Instant;
import java.util.ArrayList;
import java.util.List;

import edu.brown.cs.student.term.DatabaseQuerier;
import edu.brown.cs.student.term.trade.Trade;
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 static org.junit.Assert.assertFalse;

public class DBQuerierTest {

  /** 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/mock_trades.sqlite3");
    } catch(Exception e){
      System.out.println("DBQuerier Test, couldn't connect to db???");
    }
  }


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

  @Test
  public void testNonExistentStock(){
    setUp();
    List<Trade> fakeStockList = new ArrayList<>();
    try{
      fakeStockList = db.getTradeByStock("NONO", 1, start, end);
    } catch(Exception e) {
      System.out.println("Error in test");
    }
    assertTrue(fakeStockList.isEmpty());
    tearDown();
  }

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

    List<Trade> gmeBadDatesList = new ArrayList<>();
    List<String> noStocks = new ArrayList<>();
    List<List<Trade>> noTrades = new ArrayList<>();
    try {
      gmeBadDatesList = db.getTradeByStock("GME", 1, start, end);
      noStocks = db.getRecentStocks(start, end);
      noTrades = db.getAllTradesByStock(start, end);
    } catch (Exception e){
      System.out.println("ERROR: in test");
    }
    assertTrue(gmeBadDatesList.isEmpty());
    assertTrue(noStocks.isEmpty());
    assertTrue(noTrades.isEmpty());
    tearDown();

  }

  @Test
  public void testEmptyStringStock(){
    setUp();
    List<Trade> fakeStockList = new ArrayList<>();
    try{
      fakeStockList = db.getTradeByStock("", 1, start, end);
    } catch(Exception e) {
      System.out.println("Error in test");
    }
    assertTrue(fakeStockList.isEmpty());
    tearDown();
  }

  @Test
  public void testNeitherIsBuyOrSell(){
    setUp();
    List<Trade> fakeStockList = new ArrayList<>();
    try{
      fakeStockList = db.getTradeByStock("GME", 3, start, end);
    } catch(Exception e) {
      System.out.println("Error in test");
    }
    assertTrue(fakeStockList.isEmpty());
    tearDown();
  }

  @Test
  public void testIsSell(){
    setUp();
    List<Trade> sellGMEList = new ArrayList<>();
    try{
      sellGMEList = db.getTradeByStock("GME", 0, start, end);
    } catch(Exception e) {
      System.out.println("Error in test");
    }
    assertEquals(7, sellGMEList.size());
    for(Trade t: sellGMEList){
      assertFalse(t.isBuy());
    }
    tearDown();
  }


  @Test
  public void testFlippedDates(){
    setUp();
    List<Trade> gmeBadDatesList = new ArrayList<>();
    List<String> noStocks = new ArrayList<>();
    List<List<Trade>> noTrades = new ArrayList<>();
    try{
      gmeBadDatesList = db.getTradeByStock("GME", 1, end, start);
      noStocks = db.getRecentStocks(end, start);
      noTrades = db.getAllTradesByStock(end, start);
    } catch(Exception e) {
      System.out.println("Error in test");
    }
    assertTrue(gmeBadDatesList.isEmpty());
    assertTrue(noStocks.isEmpty());
    assertTrue(noTrades.isEmpty());
    tearDown();
  }

  @Test
  public void testTradeByStockNameBuy(){
    setUp();
    List<Trade> gmeBuyList = new ArrayList<>();
    List<Trade> teslaBuyList = new ArrayList<>();
    try{
      gmeBuyList = db.getTradeByStock("GME", 1, start, end);
      teslaBuyList = db.getTradeByStock("TSLA", 1, start, end);
    } catch(Exception e) {
      System.out.println("Error in testTradeByStockName");
    }
      System.out.println(gmeBuyList);
      assertEquals(gmeBuyList.size(), 6);
      assertEquals(gmeBuyList.get(0).getId(), 482);
      assertEquals(gmeBuyList.get(3).getId(), 149);
      assertEquals(gmeBuyList.get(4).getId(), 275);
      assertEquals(gmeBuyList.get(5).getId(), 30);

      assertEquals(teslaBuyList.size(), 16);
      assertEquals(teslaBuyList.get(0).getId(), 328);
      assertEquals(teslaBuyList.get(7).getId(), 241);
      assertEquals(teslaBuyList.get(15).getId(), 774);



    tearDown();
  }

  @Test
  public void testTradeByNameOrdering(){
    setUp();

    List<Trade> gmeSellList = new ArrayList<>();
    List<Trade> amznBuyList = new ArrayList<>();
    try{
      gmeSellList = db.getTradeByStock("GME", 0, start, end);
      amznBuyList = db.getTradeByStock("AMZN", 1, start, end);
    } catch(Exception e) {
      System.out.println("Error in test");
    }

    for(int i = 1; i < gmeSellList.size(); i++){
      assertTrue(gmeSellList.get(i-1).getTimestamp() < gmeSellList.get(i).getTimestamp());
    }


    for(int i = 1; i < amznBuyList.size(); i++){
      assertTrue(amznBuyList.get(i-1).getTimestamp() < amznBuyList.get(i).getTimestamp());
    }
    tearDown();
  }

  @Test
  public void testGetRecentStocks(){
    setUp();
    List<String> stockNames = new ArrayList<>();
    try {
      stockNames = db.getRecentStocks(start, end);
    }catch(Exception e){
      System.out.println("Error in test");
    }
    assertEquals(50, stockNames.size());
    tearDown();
  }

  @Test
  public void testGetAllTradesByStock(){
    setUp();
    List<List<Trade>> trades = new ArrayList<>();
    try {
      trades = db.getAllTradesByStock(start, end);
    }catch(Exception e){
      System.out.println("Error in test");
    }

    assertEquals(100, trades.size());

    for(List<Trade> tList: trades){
      Trade first = tList.get(0);
      for(Trade t: tList){
        //all things in each list should be for the same stock and same isBuy type
        assertEquals(first.isBuy(), t.isBuy());
        assertEquals(first.getStock(), t.getStock());
      }
    }
    tearDown();
  }

}