/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
using System;
using OpenSim.Region.CoreModules.World.Terrain;
using OpenSim.Region.Framework.Interfaces;

namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
{
    public class MinModifier : TerrainModifier
    {
        public MinModifier(ITerrainModule module) : base(module)
        {
        }

        public override string ModifyTerrain(ITerrainChannel map, string[] args)
        {
            string result;
            if (args.Length < 3)
            {
                result = "Usage: " + GetUsage();
            }
            else
            {
                TerrainModifierData data;
                result = this.parseParameters(args, out data);

                // Context-specific validation
                if (result == String.Empty)
                {
                    if (data.shape == String.Empty)
                    {
                        data.shape = "rectangle";
                        data.x0 = 0;
                        data.y0 = 0;
                        data.dx = map.Width;
                        data.dy = map.Height;
                    }
                }

                // if it's all good, then do the work
                if (result == String.Empty)
                {
                    this.applyModification(map, data);
                }
            }

            return result;
        }

        public override string GetUsage()
        {
            string val = "min <height> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<height2>]"
                + "\nEnsures that all points within the specified range are no lower than the specified value.";
            return val;

        }

        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
        {
            double factor = this.computeBevel(data, x, y);
            double result = Math.Max(data.elevation - (data.elevation - data.bevelevation) * factor, map[x, y]);
            return result;
        }

    }

}

