package com.plotsquared.bukkit.util;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Random;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Biome;
import org.bukkit.block.Block;
import org.bukkit.generator.ChunkGenerator;
import org.bukkit.generator.ChunkGenerator.BiomeGrid;
import org.bukkit.material.Directional;
import org.bukkit.material.MaterialData;

import com.intellectualcrafters.plot.PS;
import com.intellectualcrafters.plot.flag.Flag;
import com.intellectualcrafters.plot.flag.FlagManager;
import com.intellectualcrafters.plot.generator.HybridUtils;
import com.intellectualcrafters.plot.object.ChunkLoc;
import com.intellectualcrafters.plot.object.Location;
import com.intellectualcrafters.plot.object.Plot;
import com.intellectualcrafters.plot.object.PlotAnalysis;
import com.intellectualcrafters.plot.object.PlotBlock;
import com.intellectualcrafters.plot.object.RunnableVal;
import com.intellectualcrafters.plot.util.MainUtil;
import com.intellectualcrafters.plot.util.MathMan;
import com.intellectualcrafters.plot.util.TaskManager;

public class BukkitHybridUtils extends HybridUtils {

    @Override
    public void analyzePlot(final Plot plot, final RunnableVal<PlotAnalysis> whenDone) {
        // int diff, int variety, int verticies, int rotation, int height_sd

        /*
         * diff: compare to base by looping through all blocks
         * variety: add to hashset for each plotblock
         * height_sd: loop over all blocks and get top block
         *
         * verticies: store air map and compare with neighbours
         * for each block check the adjacent
         *  - Store all blocks then go through in second loop
         *  - recheck each block
         *
         */
        final World world = Bukkit.getWorld(plot.world);
        final ChunkGenerator gen = world.getGenerator();
        if (gen == null) {
            return;
        }
        final BiomeGrid base = new BiomeGrid() { @Override public void setBiome(int a, int b, Biome c) {} @Override public Biome getBiome(int a, int b) {return null;}};
        Location bot = MainUtil.getPlotBottomLoc(plot.world, plot.id).add(1, 0, 1);
        Location top = MainUtil.getPlotTopLoc(plot.world, plot.id);
        final int bx = bot.getX();
        final int bz = bot.getZ();
        final int tx = top.getX();
        final int tz = top.getZ();
        final int cbx = bx >> 4;
        final int cbz = bz >> 4;
        final int ctx = tx >> 4;
        final int ctz = tz >> 4;
        final Random r = new Random();
        MainUtil.initCache();
        final int width = tx - bx + 1;
        final int length = tz - bz + 1;

        System.gc();
        System.gc();
        final short[][][] oldblocks = new short[256][width][length];
        final short[][][] newblocks = new short[256][width][length];

        final List<ChunkLoc> chunks = new ArrayList<>();
        final List<ChunkLoc> processed_chunks = new ArrayList<>();

        for (int X = cbx; X <= ctx; X++) {
            for (int Z = cbz; Z <= ctz; Z++) {
//                Chunk chunk = world.getChunkAt(X, Z);
                chunks.add(new ChunkLoc(X, Z));
            }
        }
        final Runnable run = new Runnable() {
            @Override
            public void run() {
                for (ChunkLoc chunk : processed_chunks) {
                    short[][] result = gen.generateExtBlockSections(world, r, chunk.x, chunk.z, base);
                    int X = chunk.x;
                    int Z = chunk.z;
                    int xb = ((X) << 4) - bx;
                    int zb = ((Z) << 4) - bz;
                    for (int i = 0; i < result.length; i++) {
                        if (result[i] == null) {
                            for (int j = 0; j < 4096; j++) {
                                int x = MainUtil.x_loc[i][j] + xb;
                                if (x < 0 || x >= width) continue;
                                int z = MainUtil.z_loc[i][j] + zb;
                                if (z < 0 || z >= length) continue;
                                int y = MainUtil.y_loc[i][j];
                                oldblocks[y][x][z] = 0;
                            }
                            continue;
                        }
                        for (int j = 0; j < result[i].length; j++) {
                            int x = MainUtil.x_loc[i][j] + xb;
                            if (x < 0 || x >= width) continue;
                            int z = MainUtil.z_loc[i][j] + zb;
                            if (z < 0 || z >= length) continue;
                            int y = MainUtil.y_loc[i][j];
                            oldblocks[y][x][z] = result[i][j];
                        }
                    }
                }
                int size = width * length;
                int[] changes = new int[size];
                int[] faces = new int[size];
                int[] data = new int[size];
                int[] air = new int[size];
                int[] variety = new int[size];

                int i = 0;
                for (int x = 0; x < width;x++) {
                    for (int z = 0; z < length;z++) {
                        HashSet<Short> types = new HashSet<>();
                        for (int y = 0; y < 256; y++) {
                            short old = oldblocks[y][x][z];
                            short now = newblocks[y][x][z];
                            if (old != now) {
                                changes[i]++;
                            }
                            if (now == 0) {
                                air[i]++;
                            }
                            else {
                                // check verticies
                                // modifications_adjacent
                                if (x > 0 && z > 0 && y > 0 && x < width - 1 && z < length - 1 && y < 255) {
                                    if (newblocks[y - 1][x][z] == 0) faces[i]++;
                                    if (newblocks[y][x - 1][z] == 0) faces[i]++;
                                    if (newblocks[y][x][z - 1] == 0) faces[i]++;
                                    if (newblocks[y + 1][x][z] == 0) faces[i]++;
                                    if (newblocks[y][x + 1][z] == 0) faces[i]++;
                                    if (newblocks[y][x][z + 1] == 0) faces[i]++;
                                }

                                Material material = Material.getMaterial(now);
                                Class<? extends MaterialData> md = material.getData();
                                if (md.equals(Directional.class)) {
                                    data[i] += 8;
                                }
                                else if (!md.equals(MaterialData.class)) {
                                    data[i]++;
                                }
                                types.add(now);
                            }
                        }
                        variety[i] = types.size();
                        i++;
                    }
                }
                // analyze plot
                // put in analysis obj

                // run whenDone
                PlotAnalysis analysis = new PlotAnalysis();
                analysis.changes = (int) (MathMan.getMean(changes) * 100);
                analysis.faces = (int) (MathMan.getMean(faces) * 100);
                analysis.data = (int) (MathMan.getMean(data) * 100);
                analysis.air = (int) (MathMan.getMean(air) * 100);
                analysis.variety = (int) (MathMan.getMean(variety) * 100);
                
                analysis.changes_sd = (int) (MathMan.getSD(changes, analysis.changes));
                analysis.faces_sd = (int) (MathMan.getSD(faces, analysis.faces));
                analysis.data_sd = (int) (MathMan.getSD(data, analysis.data));
                analysis.air_sd = (int) (MathMan.getSD(air, analysis.air));
                analysis.variety_sd = (int) (MathMan.getSD(variety, analysis.variety));
                
                List<Integer> result = new ArrayList<>();
                result.add(analysis.changes);
                result.add(analysis.faces);
                result.add(analysis.data);
                result.add(analysis.air);
                result.add(analysis.variety);
                
                result.add(analysis.changes_sd);
                result.add(analysis.faces_sd);
                result.add(analysis.data_sd);
                result.add(analysis.air_sd);
                result.add(analysis.variety_sd);
                Flag flag = new Flag(FlagManager.getFlag("analysis"), result);
                FlagManager.addPlotFlag(plot, flag);
                System.gc();
                System.gc();
                whenDone.value = analysis;
                whenDone.run();
            }
        };
        System.gc();
        MainUtil.initCache();
        TaskManager.index.incrementAndGet();
        final Integer currentIndex = TaskManager.index.get();
        final Integer task = TaskManager.runTaskRepeat(new Runnable() {
            @Override
            public void run() {
                int index = chunks.size() - 1;
                if (index == -1) {
                    PS.get().TASK.cancelTask(TaskManager.tasks.get(currentIndex));
                    TaskManager.runTaskAsync(run);
                    return;
                }
                ChunkLoc chunk = chunks.remove(0);
                world.loadChunk(chunk.x, chunk.z);
                processed_chunks.add(chunk);
                int X = chunk.x;
                int Z = chunk.z;
                int minX;
                int minZ;
                int maxX;
                int maxZ;
                if (X == cbx) minX = bx & 0x0f;
                else minX = 0;
                if (Z == cbz) minZ = bz & 0x0f;
                else minZ = 0;
                if (X == ctx) maxX = tx & 0x0f;
                else maxX = 16;
                if (Z == ctz) maxZ = tz & 0x0f;
                else maxZ = 16;
                
                int cbx = X << 4;
                int cbz = Z << 4;
                
                int xb = (cbx) - bx;
                int zb = (cbz) - bz;
                for (int x = minX; x <= maxX; x++) {
                    int xx = cbx + cbz;
                    for (int z = minZ; z <= maxZ; z++) {
                        int zz = cbz + z;
                        for (int y = 0; y < 256; y++) {
                            Block block = world.getBlockAt(xx, y, zz);
                            int xr = xb + x;
                            int zr = zb + z;
                            newblocks[y][xr][zr] = (short) block.getTypeId();
                        }
                    }
                }
                world.unloadChunkRequest(chunk.x, chunk.z, true);
            }
        }, 1);
        TaskManager.tasks.put(currentIndex, task);
    }

    @Override
    public int checkModified(final String worldname, final int x1, final int x2, final int y1, final int y2, final int z1, final int z2, final PlotBlock[] blocks) {
        final World world = BukkitUtil.getWorld(worldname);
        int count = 0;
        for (int y = y1; y <= y2; y++) {
            for (int x = x1; x <= x2; x++) {
                for (int z = z1; z <= z2; z++) {
                    final Block block = world.getBlockAt(x, y, z);
                    final int id = block.getTypeId();
                    boolean same = false;
                    for (final PlotBlock p : blocks) {
                        if (id == p.id) {
                            same = true;
                            break;
                        }
                    }
                    if (!same) {
                        count++;
                    }
                }
            }
        }
        return count;
    }

    @Override
    public int get_ey(final String worldname, final int sx, final int ex, final int sz, final int ez, final int sy) {
        final World world = BukkitUtil.getWorld(worldname);
        final int maxY = world.getMaxHeight();
        int ey = sy;
        for (int x = sx; x <= ex; x++) {
            for (int z = sz; z <= ez; z++) {
                for (int y = sy; y < maxY; y++) {
                    if (y > ey) {
                        final Block block = world.getBlockAt(x, y, z);
                        if (block.getTypeId() != 0) {
                            ey = y;
                        }
                    }
                }
            }
        }
        return ey;
    }
}