Master Farmer Pickpocketing

package org.nr.plugins.npc.thieving

import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory
import com.fasterxml.jackson.module.kotlin.KotlinModule
import com.fasterxml.jackson.module.kotlin.readValue
import org.nr.plugins.items.pojos.category.ChanceCategory
import org.nr.plugins.items.pojos.getRandomWeightedElement
import org.nr.plugins.items.pojos.group.ChanceNamedItemEntryRangedAmountGroup
import org.nr.plugins.items.pojos.individual.asItem
import org.nr.server.content.CheatPrevention
import org.nr.server.model.Animation
import org.nr.server.model.Graphic
import org.nr.server.model.Skill
import org.nr.server.model.entity.npc.Npc
import java.nio.file.Path
import java.nio.file.Paths
import java.util.concurrent.ThreadLocalRandom

val masterFarmerNpcId = 2234
val pickpocketOption = 2

val mapper: ObjectMapper = ObjectMapper(YAMLFactory()).registerModule(KotlinModule())
val path: Path = Paths.get("data", "def", "yaml", "items", "masterfarmer.yml")
val categories: List<ChanceCategory<ChanceNamedItemEntryRangedAmountGroup>> = mapper.readValue(path.toFile())

on_npc_option(masterFarmerNpcId, pickpocketOption) { farmer ->
    player.attemptPickpocketOn(farmer) {
        val groups = categories.getRandomWeightedElement().groups
        val group = groups.getRandomWeightedElement()
        val item = group.items.random().asItem()

        player.inventory.add(item)

        val plural = item.amount > 1
        player.message("You steal ${if (plural) "some" else "a"} ${item.definition.name}${if (plural) "s" else ""}.")
    }
}

fun Player.attemptPickpocketOn(npc: Npc, successAction: () -> Unit) {
    if (!clickDelay.elapsed(2000)) {
        return
    }
    if (CheatPrevention.roll(this)) {
        return
    }
    if (inventory.freeSlots <= 0) {
        message("You don't have free inventory space.")
        return
    }
    val thievingLevel = skillManager.getCurrentLevel(Skill.THIEVING)
    if (thievingLevel < 38) {
        message("You need at least 38 Thieving to pickpocket this NPC.")
        return
    }
    val successChance = (90 + 1.53061224 * (thievingLevel - 1)) / 255
    val roll = ThreadLocalRandom.current().nextDouble()
    debug("successChance = $successChance; roll = $roll")
    if (roll <= successChance) {
        positionToFace = npc.position
        performAnimation(Animation(881))
        successAction()
        packetSender.sendInterfaceRemoval()
        skillManager.addExperience(Skill.THIEVING, 4300)
    } else {
        npc.forceChat("Cor blimey mate, what are ye doing in me pockets?")
        npc.positionToFace = position
        performGraphic(Graphic(80, Graphic.GraphicHeight.HIGH))
        performAnimation(Animation(404))
        stun(ThreadLocalRandom.current().nextInt(7, 11))
    }
    clickDelay.reset()
}