refactor: planet industry production

internal/model/game/planet.go

@@ -1,8 +1,6 @@
 package game
 
 import (
-	"math"
-
 	"github.com/google/uuid"
 )
 
@@ -106,20 +104,15 @@ func ProducedMaterial(shipMass, progress float64) float64 {
 }
 
 // Производство промышленности
-// TODO: test on real values
-// [x] ind * 5 + ind / res = prod
-// [x] ind = (res * prod) / (5 * res + 1)
-// ind = 10 * 1000 / (5 * 10 + 1) = 10000 / 55 = 181.(81)
-// int = 10 * 500 / 55 = 5000 / 55
 func (p *Planet) ProduceIndustry(freeProduction float64) {
-	var ind float64
-	if p.Material > 0 {
-		ind = math.Min(freeProduction/5, p.Material.F())
-		p.Mat(p.Material.F() - ind)
-		freeProduction -= ind * 5.
+	prod := freeProduction / 5
+	if float64(p.Material) < prod {
+		prod = (freeProduction + float64(p.Material/p.Resources)) / (5. + 1./float64(p.Resources))
+		p.Material = 0.
+	} else {
+		p.Material = p.Material.Add(-prod)
 	}
-	ind += (freeProduction * p.Resources.F()) / (5.*p.Resources.F() + 1.)
-	p.Ind(p.Industry.F() + ind)
+	p.Industry = p.Industry.Add(prod)
 	if p.Industry > p.Population {
 		p.Capital += p.Industry - p.Population
 		p.Industry = p.Population