# RandomMover — random speed/turn with persistence, head-on firing.
# Purpose: test guns against unpredictable movement.

import std/[math, os, random]
import robocode_tankroyale_botapi

const botJsonPath = currentSourcePath().parentDir / "RandomMover.json"

type RandomMover = ref object of Bot
  currentSpeed:   float
  currentTurn:    float
  ticksUntilChange: int

proc newDirection(bot: RandomMover) =
  bot.currentSpeed      = rand(-8.0..8.0)
  # The server caps body turn at calcMaxTurnRate(speed) = 10 - 0.75*|speed|
  # (~4 deg/tick at full speed); keep the random intent inside that limit so it
  # is not silently saturated by the server.
  let maxTurn           = calcMaxTurnRate(bot.currentSpeed)
  bot.currentTurn       = rand(-maxTurn..maxTurn)
  bot.ticksUntilChange  = rand(10..20)

method onRoundStarted*(bot: RandomMover, e: RoundStartedEvent) =
  randomize()
  setAdjustGunForBodyTurn(true)
  setAdjustRadarForBodyTurn(true)
  setAdjustRadarForGunTurn(true)
  newDirection(bot)

method onScannedBot*(bot: RandomMover, e: ScannedBotEvent) =
  let bearing  = directionTo(getX(), getY(), e.x, e.y)
  let gunDelta = normalizeRelativeAngle(bearing - getGunDirection())
  setGunTurnRate(gunDelta.clamp(-MAX_GUN_TURN_RATE, MAX_GUN_TURN_RATE))
  if abs(gunDelta) < 3.0 and getGunHeat() <= 0.0:
    discard setFire(1.0)

method run*(bot: RandomMover) =
  while isRunning():
    dec bot.ticksUntilChange
    if bot.ticksUntilChange <= 0:
      newDirection(bot)

    setTargetSpeed(bot.currentSpeed)
    setTurnRate(bot.currentTurn)
    setRadarTurnRate(45.0)
    go()

when isMainModule:
  var bot = RandomMover()
  start(bot, botJsonPath)