# OscillatorBot — predictable zigzag sparring partner for GA gun testing.
# Reverses direction + turn every PERIOD ticks. Head-on targeting only.

import std/[math, os]
import tankroyale_botapi

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

const
  SPEED  = 7.0    # forward/backward speed
  PERIOD = 25     # ticks between direction reversals

type OscillatorBot = ref object of Bot
  tickCount: int
  moveSign:  float  # +1 forward, -1 backward
  turnSign:  float  # +1 right, -1 left

method onRoundStarted*(bot: OscillatorBot, e: RoundStartedEvent) =
  setAdjustGunForBodyTurn(true)
  setAdjustRadarForBodyTurn(true)
  setAdjustRadarForGunTurn(true)
  bot.tickCount = 0
  bot.moveSign  = 1.0
  bot.turnSign  = 1.0

method onScannedBot*(bot: OscillatorBot, e: ScannedBotEvent) =
  # Head-on targeting: aim gun directly at enemy, fire medium power
  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) < 10.0 and getGunHeat() <= 0.0:
    discard setFire(2.0)

method run*(bot: OscillatorBot) =
  while isRunning():
    inc bot.tickCount
    if bot.tickCount mod PERIOD == 0:
      bot.moveSign *= -1.0
      bot.turnSign *= -1.0

    setTargetSpeed(bot.moveSign * SPEED)
    setTurnRate(bot.turnSign * 4.0)
    setRadarTurnRate(45.0)  # spin radar to keep scanning
    go()

when isMainModule:
  var bot = OscillatorBot(moveSign: 1.0, turnSign: 1.0)
  start(bot, botJsonPath)