local Headbutt = extend(Ability)

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-- Data
----------------
Headbutt.cooldown = 7
Headbutt.knockbackDistance = 100
Headbutt.damageModifier = 1.25


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-- Behavior
----------------
function Headbutt:activate()
  self.unit.animation:on('event', function(event)
    if event.data.name == 'headbutt' then
      local targets = ctx.target:inRange(self.unit, self.unit.width / 2 + 32, 'enemy', 'unit', 'player')
      local count = table.count(targets)
      local damage = (self.unit.damage * self.damageModifier) / count
      table.each(targets, function(target)
        if math.sign(target.x - self.unit.x) == self:getUnitDirection() then
          if isa(target, Unit) and target.buffs then target.buffs:add('headbutt', {offset = self.knockbackDistance * self:getUnitDirection()}) end
          target:hurt(damage, self.unit, {'spell'})
        end
      end)

      if self.unit.target then
        local x, y = self.unit:attackParticlePosition(self.unit.target)
        ctx.particles:emit(self.unit.class.code .. 'attack', x, y, self.unit.class.attackParticleCount or 5)
      end
    end
  end)
end

function Headbutt:use()
  if self.unit.target and isa(self.unit.target, Unit) then
    self.unit.animation:set('headbutt')
    self.unit.casting = true
    self.timer = self.cooldown
  end
end

return Headbutt