## Rammer movement — drive straight at enemy at max speed.
## Forward/backward optimization: if enemy is behind, reverse instead of U-turning.

import std/math
import gun_harness/gun_interface
import movement_harness/movement_interface

const MaxSpeed* = 8.0

type RammerModule* = object
  discard

proc initRammer*(): RammerModule = RammerModule()

proc computeMove*(m: var RammerModule, ws: WorldState): MoveCommand =
  let enemyBearing = arctan2(ws.enemyY - ws.selfY, ws.enemyX - ws.selfX) * (180.0 / PI)

  # Delta from current heading to enemy bearing
  var delta = enemyBearing - ws.selfHeading
  while delta >  180.0: delta -= 360.0
  while delta < -180.0: delta += 360.0

  # If enemy is behind (|delta| > 90°), reverse to avoid U-turn
  let (speed, turnDelta) =
    if abs(delta) <= 90.0:
      (MaxSpeed, delta)
    else:
      let backDelta = if delta > 0.0: delta - 180.0 else: delta + 180.0
      (-MaxSpeed, backDelta)

  (speed: speed, turnRate: turnDelta.clamp(-10.0, 10.0))