attack.go

package main

import (
	"github.com/rfc1459/xmp"
	"github.com/rfc1459/xmp/portal"
)

// Per-resonator attack
func perResAttack(p portal.Portal, x xmp.Xmp) (xmps int) {
	orientation := portal.N
	angle := portal.AngleMatrix[orientation]
	distance := p.MeanResonatorDistance()

	xmps = 0
	for {
		p.Attack(x, distance, angle)
		xmps++
		if p.EnergyAt(orientation) == 0 {
			// Switch to next octant
			orientation = (orientation + 1) % 8
			angle = portal.AngleMatrix[orientation]
		}
		if p.Energy() == 0 {
			break
		}
	}
	return
}

// Straightforward fixed-point attack
func dumbAttack(p portal.Portal, x xmp.Xmp, distance, angle float64) (xmps int) {
	xmps = 0
	for {
		p.Attack(x, distance, angle)
		xmps++
		if p.Energy() == 0 {
			break
		}
	}
	return
}

// Select the best attack profile for the given XMP
func smartAttack(p portal.Portal, x xmp.Xmp) (xmps int) {
	lvl := x.Level()
	switch {
	case lvl <= 5:
		// Per resonator-attack profile
		xmps = perResAttack(p, x)
	case lvl == 6:
		// Mid-point attack profile
		xmps = dumbAttack(p, x, p.MeanResonatorDistance()/2, 0)
	default:
		// Full portal attack profile
		xmps = dumbAttack(p, x, 0, 0)
	}
	return
}