spigot-chunkmaster/src/main/kotlin/net/trivernis/chunkmaster/lib/generation/GenerationTask.kt

package net.trivernis.chunkmaster.lib.generation

import net.trivernis.chunkmaster.Chunkmaster
import net.trivernis.chunkmaster.lib.Spiral
import org.bukkit.Chunk
import org.bukkit.World

/**
 * Interface for generation tasks.
 */
abstract class GenerationTask(plugin: Chunkmaster, centerChunk: Chunk, startChunk: Chunk) : Runnable {

    abstract val stopAfter: Int
    abstract val world: World
    abstract val count: Int
    abstract val lastChunk: Chunk
    abstract val endReached: Boolean

    protected val spiral: Spiral =
        Spiral(Pair(centerChunk.x, centerChunk.z), Pair(startChunk.x, startChunk.z))
    protected val loadedChunks: HashSet<Chunk> = HashSet()
    protected val chunkSkips = plugin.config.getInt("generation.chunks-skips-per-step")
    protected val msptThreshold = plugin.config.getLong("generation.mspt-pause-threshold")

    abstract override fun run()
    abstract fun cancel()

    val nextChunkCoordinates: ChunkCoordinates
        get() {
            val nextChunkCoords = spiral.next()
            return ChunkCoordinates(nextChunkCoords.first, nextChunkCoords.second)
        }
    val nextChunk: Chunk
        get() {
            val next = nextChunkCoordinates
            return world.getChunkAt(next.x, next.z)
        }

    protected fun borderReached(): Boolean {
        return !world.worldBorder.isInside(lastChunk.getBlock(8, 0, 8).location) || (stopAfter in 1..count)
    }
}