package mtmc.os.shell.builtins

import mtmc.emulator.MonTanaMiniComputer
import mtmc.os.shell.ShellCommand
import mtmc.tokenizer.MTMCToken
import mtmc.tokenizer.MTMCTokenizer

class SpeedCommand : ShellCommand() {
  private val speeds = listOf(
      1, 10, 100, 1000, 10000, 100000, 1000000
  )

  @Throws(Exception::class)
  override fun exec(tokens: MTMCTokenizer, computer: MonTanaMiniComputer) {
    if (tokens.match(MTMCToken.TokenType.IDENTIFIER)) {
      computer.speed = 0
    } else if (tokens.match(MTMCToken.TokenType.INTEGER)) {
      val speed = tokens.consumeAsInteger()
      if (!speeds.contains(speed)) {
        usageException()
      }
      computer.speed = speed
    } else {
      usageException()
    }
  }

  override val help: String
    get() = """
speed <val> - set the speed of the computer
  where <val> is one of:
     raw  - run with no simulated speed delay
     1    - run the computer at 1hz
     10   - run the computer at 10hz
     100  - run the computer at 100hz
     1000 - run the computer at 1khz
     """.trimIndent()
}