package snake

import Fixtures.*

class M05GameSuite extends munit.FunSuite:
  cases("m05-update").foreach { c =>
    test(s"update: ${c("name").str}") {
      val a = c("args")
      assertEquals(Game.update(gameState(a(0)), action(a(1))), gameState(c("expected")))
    }
  }

  cases("m05-replay").foreach { c =>
    test(s"replay: ${c("name").str}") {
      val a = c("args")
      assertEquals(Game.replay(gameState(a(0)), list(a(1))(action)), gameState(c("expected")))
    }
  }

  cases("m05-history").foreach { c =>
    test(s"history: ${c("name").str}") {
      val a = c("args")
      assertEquals(Game.history(gameState(a(0)), list(a(1))(action)), list(c("expected"))(gameState))
    }
  }

  private val replayArgs = cases("m05-replay")(0)("args")
  private val start = gameState(replayArgs(0))
  private val actions = list(replayArgs(1))(action)

  test("history has one more state than there are actions") {
    assertEquals(Game.history(start, actions).length, actions.length + 1)
  }

  test("history starts at the start state and ends where replay ends") {
    val states = Game.history(start, actions)
    assertEquals(states.head, start)
    assertEquals(states.last, Game.replay(start, actions))
  }