package memory

import (
	"github.com/hectorgimenez/d2go/pkg/data/area"
)

func (gd *GameReader) TerrorZones() (areas []area.ID) {
	const maxActiveZoneCount = 16

	structPtr := gd.moduleBaseAddressPtr + gd.offset.TZ
	zonesPtr := uintptr(gd.ReadUInt(structPtr, Uint64))
	actualActiveZoneCount := int(gd.ReadUInt(structPtr+0x8, Uint8))
	if zonesPtr == 0 || actualActiveZoneCount <= 0 || actualActiveZoneCount > maxActiveZoneCount {
		return nil
	}

	for i := 0; i < actualActiveZoneCount; i++ {
		tzArea := gd.ReadUInt(zonesPtr+uintptr(i*Uint32), Uint32)
		id := area.ID(tzArea)
		if id.CanBeTerrorized() {
			areas = append(areas, id)
		}
	}

	return
}