// $Id$
/*
 * WorldEdit
 * Copyright (C) 2010 sk89q <http://www.sk89q.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

package com.sk89q.worldedit.commands;

import com.sk89q.minecraft.util.commands.Command;
import com.sk89q.minecraft.util.commands.CommandContext;
import com.sk89q.minecraft.util.commands.CommandPermissions;
import com.sk89q.minecraft.util.commands.Logging;
import static com.sk89q.minecraft.util.commands.Logging.LogMode.*;
import com.sk89q.worldedit.*;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.ExpressionException;
import com.sk89q.worldedit.patterns.Pattern;
import com.sk89q.worldedit.regions.Region;
import com.sk89q.worldedit.util.TreeGenerator;

/**
 * Generation commands.
 * 
 * @author sk89q
 */
public class GenerationCommands {
    @Command(
        aliases = { "/hcyl" },
        usage = "<block> <radius> [height]",
        desc = "Generate a hollow cylinder",
        min = 2,
        max = 3
    )
    @CommandPermissions("worldedit.generation.cylinder")
    @Logging(PLACEMENT)
    public static void hcyl(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        Pattern block = we.getBlockPattern(player, args.getString(0));
        double radius = Math.max(1, args.getDouble(1));
        int height = args.argsLength() > 2 ? args.getInteger(2) : 1;

        Vector pos = session.getPlacementPosition(player);
        int affected = editSession.makeHollowCylinder(pos, block, radius, height);
        player.print(affected + " block(s) have been created.");
    }

    @Command(
        aliases = { "/cyl" },
        usage = "<block> <radius> [height]",
        desc = "Generate a cylinder",
        min = 2,
        max = 3
    )
    @CommandPermissions("worldedit.generation.cylinder")
    @Logging(PLACEMENT)
    public static void cyl(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        Pattern block = we.getBlockPattern(player, args.getString(0));
        double radius = Math.max(1, args.getDouble(1));
        int height = args.argsLength() > 2 ? args.getInteger(2) : 1;

        Vector pos = session.getPlacementPosition(player);
        int affected = editSession.makeCylinder(pos, block, radius, height);
        player.print(affected + " block(s) have been created.");
    }

    @Command(
        aliases = { "/hsphere" },
        usage = "<block> <radius>[,<radius>,<radius>] [raised?]",
        desc = "Generate a hollow sphere.",
        min = 2,
        max = 3
    )
    @CommandPermissions("worldedit.generation.sphere")
    @Logging(PLACEMENT)
    public static void hsphere(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        final Pattern block = we.getBlockPattern(player, args.getString(0));
        String[] radiuses = args.getString(1).split(",");
        final double radiusX, radiusY, radiusZ;
        switch (radiuses.length) {
        case 1:
            radiusX = radiusY = radiusZ = Math.max(1, Double.parseDouble(radiuses[0]));
            break;

        case 3:
            radiusX = Math.max(1, Double.parseDouble(radiuses[0]));
            radiusY = Math.max(1, Double.parseDouble(radiuses[1]));
            radiusZ = Math.max(1, Double.parseDouble(radiuses[2]));
            break;

        default:
            player.printError("You must either specify 1 or 3 radius values.");
            return;
        }
        final boolean raised;
        if (args.argsLength() > 2) {
            raised = args.getString(2).equalsIgnoreCase("true") || args.getString(2).equalsIgnoreCase("yes");
        } else {
            raised = false;
        }

        Vector pos = session.getPlacementPosition(player);
        if (raised) {
            pos = pos.add(0, radiusY, 0);
        }

        int affected = editSession.makeSphere(pos, block, radiusX, radiusY, radiusZ, false);
        player.findFreePosition();
        player.print(affected + " block(s) have been created.");
    }

    @Command(
        aliases = { "/sphere" },
        usage = "<block> <radius>[,<radius>,<radius>] [raised?]",
        desc = "Generate a filled sphere.",
        min = 2,
        max = 3
    )
    @CommandPermissions("worldedit.generation.sphere")
    @Logging(PLACEMENT)
    public static void sphere(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        Pattern block = we.getBlockPattern(player, args.getString(0));
        String[] radiuses = args.getString(1).split(",");
        final double radiusX, radiusY, radiusZ;
        switch (radiuses.length) {
        case 1:
            radiusX = radiusY = radiusZ = Math.max(1, Double.parseDouble(radiuses[0]));
            break;

        case 3:
            radiusX = Math.max(1, Double.parseDouble(radiuses[0]));
            radiusY = Math.max(1, Double.parseDouble(radiuses[1]));
            radiusZ = Math.max(1, Double.parseDouble(radiuses[2]));
            break;

        default:
            player.printError("You must either specify 1 or 3 radius values.");
            return;
        }
        final boolean raised;
        if (args.argsLength() > 2) {
            raised = args.getString(2).equalsIgnoreCase("true") || args.getString(2).equalsIgnoreCase("yes");
        } else {
            raised = false;
        }

        Vector pos = session.getPlacementPosition(player);
        if (raised) {
            pos = pos.add(0, radiusY, 0);
        }

        int affected = editSession.makeSphere(pos, block, radiusX, radiusY, radiusZ, true);
        player.findFreePosition();
        player.print(affected + " block(s) have been created.");
    }

    @Command(
        aliases = { "forestgen" },
        usage = "[size] [type] [density]",
        desc = "Generate a forest",
        min = 0,
        max = 3
    )
    @CommandPermissions("worldedit.generation.forest")
    @Logging(POSITION)
    public static void forestGen(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {
        
        int size = args.argsLength() > 0 ? Math.max(1, args.getInteger(0)) : 10;
        TreeGenerator.TreeType type = args.argsLength() > 1 ?
                type = TreeGenerator.lookup(args.getString(1))
                : TreeGenerator.TreeType.TREE;
        double density = args.argsLength() > 2 ? args.getDouble(2) / 100 : 0.05;

        if (type == null) {
            player.printError("Tree type '" + args.getString(1) + "' is unknown.");
            return;
        }
        
        int affected = editSession.makeForest(player.getPosition(),
                size, density, new TreeGenerator(type));
        player.print(affected + " trees created.");
    }
    
    @Command(
        aliases = { "pumpkins" },
        usage = "[size]",
        desc = "Generate pumpkin patches",
        min = 0,
        max = 1
    )
    @CommandPermissions("worldedit.generation.pumpkins")
    @Logging(POSITION)
    public static void pumpkins(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        int size = args.argsLength() > 0 ? Math.max(1, args.getInteger(0)) : 10;

        int affected = editSession.makePumpkinPatches(player.getPosition(), size);
        player.print(affected + " pumpkin patches created.");
    }
    
    @Command(
        aliases = { "/pyramid" },
        usage = "<block> <size>",
        desc = "Generate a filled pyramid",
        min = 2,
        max = 2
    )
    @CommandPermissions("worldedit.generation.pyramid")
    @Logging(PLACEMENT)
    public static void pyramid(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        Pattern block = we.getBlockPattern(player, args.getString(0));
        int size = Math.max(1, args.getInteger(1));
        Vector pos = session.getPlacementPosition(player);
        
        int affected = editSession.makePyramid(pos, block, size, true);
        
        player.findFreePosition();
        player.print(affected + " block(s) have been created.");
    }
    
    @Command(
        aliases = { "/hpyramid" },
        usage = "<block> <size>",
        desc = "Generate a hollow pyramid",
        min = 2,
        max = 2
    )
    @CommandPermissions("worldedit.generation.pyramid")
    @Logging(PLACEMENT)
    public static void hpyramid(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        Pattern block = we.getBlockPattern(player, args.getString(0));
        int size = Math.max(1, args.getInteger(1));
        Vector pos = session.getPlacementPosition(player);
        
        int affected = editSession.makePyramid(pos, block, size, false);
        
        player.findFreePosition();
        player.print(affected + " block(s) have been created.");
    }

    @Command(
        aliases = { "/generate", "/gen", "/g" },
        usage = "<block> <equation>",
        desc = "Generates a shape according to a formula. -h for hollow, -r for raw coordinates, -o for unscaled, but offset from placement",
        flags = "hro",
        min = 1,
        max = -1
    )
    @CommandPermissions("worldedit.generation.shape")
    @Logging(ALL)
    public static void generate(CommandContext args, WorldEdit we,
            LocalSession session, LocalPlayer player, EditSession editSession)
            throws WorldEditException {

        final Pattern pattern = we.getBlockPattern(player, args.getString(0));
        final Region region = session.getSelection(player.getWorld());

        final Expression expression;
        try {
            expression = Expression.compile(args.getJoinedStrings(1), "x", "y", "z");
            expression.optimize();
        }
        catch (ExpressionException e) {
            player.printError(e.getMessage());
            return;
        }

        final ArbitraryShape shape;

        if (args.hasFlag('r')) {
            shape = new ArbitraryShape(region) {
                @Override
                protected boolean isInside(double x, double y, double z) {
                    try {
                        return expression.evaluate(x, y, z) > 0;
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                        return false;
                    }
                }
            };
        }
        else if (args.hasFlag('o')) {
            final Vector placement = session.getPlacementPosition(player);

            final double placementX = placement.getX();
            final double placementY = placement.getY();
            final double placementZ = placement.getZ();

            shape = new ArbitraryShape(region) {
                @Override
                protected boolean isInside(double x, double y, double z) {
                    try {
                        return expression.evaluate(x - placementX, y - placementY, z - placementZ) > 0;
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                        return false;
                    }
                }
            };
        }
        else {
            final Vector min = region.getMinimumPoint();
            final Vector max = region.getMaximumPoint();
            final Vector center = max.add(min).multiply(0.5);
            final Vector stretch = max.subtract(center);
            shape = new ArbitraryShape(region) {
                @Override
                protected boolean isInside(double x, double y, double z) {
                    final Vector scaled = new Vector(x, y, z).subtract(center).divide(stretch);

                    try {
                        return expression.evaluate(scaled.getX(), scaled.getY(), scaled.getZ()) > 0;
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                        return false;
                    }
                }
            };
        }

        final boolean hollow = args.hasFlag('h');
        int affected = shape.generate(editSession, pattern, hollow);

        player.findFreePosition();
        player.print(affected + " block(s) have been created.");
    }
}