package com.hypixel.hytale.builtin.hytalegenerator.props;

import com.hypixel.hytale.builtin.hytalegenerator.bounds.Bounds3i;
import com.hypixel.hytale.builtin.hytalegenerator.conveyor.stagedconveyor.ContextDependency;
import com.hypixel.hytale.builtin.hytalegenerator.datastructures.WeightedMap;
import com.hypixel.hytale.builtin.hytalegenerator.datastructures.voxelspace.VoxelSpace;
import com.hypixel.hytale.builtin.hytalegenerator.datastructures.voxelspace.WindowVoxelSpace;
import com.hypixel.hytale.builtin.hytalegenerator.framework.math.Calculator;
import com.hypixel.hytale.builtin.hytalegenerator.framework.math.SeedGenerator;
import com.hypixel.hytale.builtin.hytalegenerator.material.Material;
import com.hypixel.hytale.builtin.hytalegenerator.newsystem.views.EntityContainer;
import com.hypixel.hytale.builtin.hytalegenerator.patterns.Pattern;
import com.hypixel.hytale.builtin.hytalegenerator.scanners.Scanner;
import com.hypixel.hytale.builtin.hytalegenerator.threadindexer.WorkerIndexer;
import com.hypixel.hytale.math.util.FastRandom;
import com.hypixel.hytale.math.vector.Vector3i;
import it.unimi.dsi.fastutil.doubles.Double2DoubleFunction;
import java.util.List;
import javax.annotation.Nonnull;

public class ClusterProp extends Prop {
   private final Double2DoubleFunction weightCurve;
   private final SeedGenerator seedGenerator;
   private final WeightedMap<Prop> propWeightedMap;
   private final int range;
   private final ContextDependency contextDependency;
   private final Pattern pattern;
   private final Scanner scanner;
   private final Bounds3i writeBounds_voxelGrid;

   public ClusterProp(
      int range,
      @Nonnull Double2DoubleFunction weightCurve,
      int seed,
      @Nonnull WeightedMap<Prop> propWeightedMap,
      @Nonnull Pattern pattern,
      @Nonnull Scanner scanner
   ) {
      if (range < 0) {
         throw new IllegalArgumentException("negative range");
      } else {
         this.range = range;
         this.seedGenerator = new SeedGenerator(seed);
         this.weightCurve = weightCurve;
         this.pattern = pattern;
         this.scanner = scanner;
         this.propWeightedMap = new WeightedMap<>();
         propWeightedMap.forEach((prop, weight) -> {
            ContextDependency contextDependency = prop.getContextDependency();
            Vector3i readRangex = contextDependency.getReadRange();
            Vector3i writeRangex = contextDependency.getWriteRange();
            if (readRangex.x <= 0 && readRangex.z <= 0 && writeRangex.x <= 0 && writeRangex.z <= 0) {
               this.propWeightedMap.add(prop, propWeightedMap.get(prop));
            }
         });
         Vector3i readRange = scanner.readSpaceWith(pattern).getRange();
         Vector3i writeRange = new Vector3i(range + readRange.x, 0, range + readRange.z);
         this.contextDependency = new ContextDependency(readRange, writeRange);
         this.writeBounds_voxelGrid = this.contextDependency.getTotalPropBounds_voxelGrid();
      }
   }

   public PositionListScanResult scan(@Nonnull Vector3i position, @Nonnull VoxelSpace<Material> materialSpace, @Nonnull WorkerIndexer.Id id) {
      Scanner.Context scannerContext = new Scanner.Context(position, this.pattern, materialSpace, id);
      List<Vector3i> validPositions = this.scanner.scan(scannerContext);
      return new PositionListScanResult(validPositions);
   }

   @Override
   public void place(@Nonnull Prop.Context context) {
      List<Vector3i> positions = PositionListScanResult.cast(context.scanResult).getPositions();
      if (positions != null) {
         for (Vector3i position : positions) {
            this.place(position, context.materialSpace, context.entityBuffer, context.workerId, context.distanceFromBiomeEdge);
         }
      }
   }

   private void place(
      @Nonnull Vector3i position,
      @Nonnull VoxelSpace<Material> materialSpace,
      @Nonnull EntityContainer entityBuffer,
      @Nonnull WorkerIndexer.Id id,
      double distanceFromBiomeEdge
   ) {
      WindowVoxelSpace<Material> columnSpace = new WindowVoxelSpace<>(materialSpace);
      FastRandom random = new FastRandom(this.seedGenerator.seedAt(position.x, position.z));

      for (int x = position.x - this.range; x < position.x + this.range; x++) {
         for (int z = position.z - this.range; z < position.z + this.range; z++) {
            double distance = Calculator.distance(x, z, position.x, position.z);
            double density = this.weightCurve.get(distance);
            if (!(random.nextDouble() > density)) {
               Prop pickedProp = this.propWeightedMap.pick(random);
               if (materialSpace.isInsideSpace(x, materialSpace.minY(), z)) {
                  columnSpace.setWindow(x, materialSpace.minY(), z, x + 1, materialSpace.maxY(), z + 1);
                  ScanResult propScanResult = pickedProp.scan(new Vector3i(x, position.y, z), columnSpace, id);
                  Prop.Context childContext = new Prop.Context(propScanResult, columnSpace, entityBuffer, id, distanceFromBiomeEdge);
                  pickedProp.place(childContext);
               }
            }
         }
      }
   }

   @Override
   public ContextDependency getContextDependency() {
      return this.contextDependency.clone();
   }

   @Nonnull
   @Override
   public Bounds3i getWriteBounds() {
      return this.writeBounds_voxelGrid;
   }
}