OPA Combat engine - Sample Rules file

combat.rego

package combat

import input.attacker as attacker
import input.defender as defender 

import data.armor.mitigation_matrix as mitmat

armor_classes = { k | mitmat[k] }
all_weapon_ids = { w | data.weapons.stats[w] }

weapon_stats = s {
	s = data.weapons.stats[attacker.weapon_id]
}

armor_stats = a {
	a = data.armor.stats[defender.armor_id]
}

mitigation_factor = mf {
	mf = mitmat[armor_stats.armor_class][weapon_stats.damage_class] / 100
}

rawdamage = d {	
	d = (attacker.dice.d100/100) * weapon_stats.base_damage
}

effectivedamage = d {
	d = rawdamage - (rawdamage * mitigation_factor)
}