import org.scalatest.funsuite.AnyFunSuite
import nova.monadic_sfx.util.MutHistory
import com.typesafe.scalalogging.LazyLogging
class MutHistoryTest extends AnyFunSuite with LazyLogging {
  val h = new MutHistory(0)

  test("init") {
    assert(h.values == Vector(0))
    assert(h.sp == 0)
    assert(h.current == 0)
  }
  test("push 1") {
    h.push(1)
    // logger.debug(mutHistory.ints.toString)
    assert(h.values == Vector(0, 1))
    assert(h.values.length - 1 == h.sp)
    assert(h.current == 1)
  }
  test("push 2") {
    h.push(2)
    // logger.debug(mutHistory.ints.toString)
    assert(h.values == Vector(0, 1, 2))
    assert(h.values.length - 1 == h.sp)
    assert(h.current == 2)
  }
  test("first forward") {
    // logger.debug(mutHistory.ints.toString)
    // logger.debug(mutHistory.sp.toString)
    h.forward()
    assert(h.values == Vector(0, 1, 2))
    assert(h.sp == 2)
    assert(h.current == 2)
  }
  test("second forward") {
    // logger.debug(mutHistory.ints.toString)
    // logger.debug(mutHistory.sp.toString)
    h.forward()
    assert(h.values == Vector(0, 1, 2))
    assert(h.sp == 2)
    assert(h.current == 2)
  }

  test("first backward") {
    h.backward()
    assert(h.values == Vector(0, 1, 2))
    assert(h.sp == 1)
    assert(h.current == 1)
  }
  test("second backward") {
    h.backward()
    assert(h.values == Vector(0, 1, 2))
    assert(h.sp == 0)
    assert(h.current == 0)
  }
  test("third backward") {
    h.backward()
    assert(h.values == Vector(0, 1, 2))
    assert(h.sp == 0)
    assert(h.current == 0)
  }
  test("push 3") {
    h.push(3)
    assert(h.sp == 0)
    assert(h.values == Vector(3))
    assert(h.current == 3)
  }
  test("fourth backward") {
    h.backward()
    assert(h.values == Vector(3))
    assert(h.sp == 0)
    assert(h.current == 3)
  }
  test("lastly") {
    h.push(4)
    h.push(5)
    h.push(6)
    h.push(7)
    h.push(8)
    assert(h.values == Vector(3, 4, 5, 6, 7, 8))
    assert(h.sp == 5)
    assert(h.current == 8)
    h.backward()
    h.backward()
    assert(h.current == 6)
    assert(h.sp == 3)
    h.push(9)
    assert(h.values == Vector(3, 4, 5, 9))
    assert(h.sp == 3)
    assert(h.current == 9)
    for (i <- 1 to 4) h.backward()
    // assert(h.current == None)
    // assert(h.ints == Vector.empty)
    assert(h.sp == 0)
    assert(h.current == 3)
    h.push(1)
    assert(h.current == 1)
    assert(h.sp == 0)

  }
}

//  test("main") {
//   assert(mutHistory.ints == Vector.empty)
//   assert(mutHistory.sp == -1)
//   mutHistory.push(1)
//   assert(mutHistory.ints == Vector(1))
//   assert(mutHistory.sp == 0)
//   mutHistory.push(2)
//   assert(mutHistory.ints == Vector(1, 2))
//   assert(mutHistory.sp == 1)
//   // mutHistory.forward()
//   // assert(mutHistory.sp == 1)
//   // mutHistory.forward()
//   // assert(mutHistory.sp == 1)
// }
//