/*
* 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 OpenSim 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.Collections.Generic;
using OpenSim.Framework.Console;
using OpenSim.Region.Environment;
using OpenSim.Region.Environment.Scenes;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.ExtensionsScriptModule.CSharp;
using OpenSim.Region.ExtensionsScriptModule.JScript;
using OpenSim.Region.ExtensionsScriptModule.JVMEngine;

namespace OpenSim.Region.ExtensionsScriptModule
{
    public class ScriptManager : IRegionModule
    {
        List<IScript> scripts = new List<IScript>();
        Scene m_scene;
        Dictionary<string, IScriptCompiler> compilers = new Dictionary<string, IScriptCompiler>();

        private void LoadFromCompiler(Dictionary<string, IScript> compiledscripts)
        {
            foreach (KeyValuePair<string, IScript> script in compiledscripts)
            {
                ScriptInfo scriptInfo = new ScriptInfo(m_scene); // Since each script could potentially corrupt their access with a stray assignment, making a new one for each script.
                MainLog.Instance.Verbose("Loading " + script.Key);
                script.Value.Initialise(scriptInfo);
                scripts.Add(script.Value);
            }
            MainLog.Instance.Verbose("Finished loading " + compiledscripts.Count.ToString() + " script(s)");
        }

        public ScriptManager()
        {
            // Default Engines
            CSharpScriptEngine csharpCompiler = new CSharpScriptEngine();
            compilers.Add(csharpCompiler.FileExt(), csharpCompiler);

            JScriptEngine jscriptCompiler = new JScriptEngine();
            compilers.Add(jscriptCompiler.FileExt(), jscriptCompiler);

            JavaEngine javaCompiler = new JavaEngine();
            compilers.Add(javaCompiler.FileExt(), javaCompiler);
        }

        public void Initialise(Scene scene)
        {
            System.Console.WriteLine("Initialising Extensions Scripting Module");
            m_scene = scene;

            m_scene.RegisterAPIMethod("API_CompileExtensionScript", new ModuleAPIMethod1<bool, string>(Compile));
            m_scene.RegisterAPIMethod("API_AddExtensionScript", new ModuleAPIMethod1<bool, IScript>(AddPreCompiledScript));
        }

        public void PostInitialise()
        {

        }

        public void CloseDown()
        {

        }

        public string GetName()
        {
            return "ExtensionsScriptingModule";
        }

        public bool IsSharedModule()
        {
            return false;
        }

        public bool Compile(string filename)
        {
            foreach (KeyValuePair<string, IScriptCompiler> compiler in compilers)
            {
                if (filename.EndsWith(compiler.Key))
                {
                    LoadFromCompiler(compiler.Value.compile(filename));
                    break;
                }
            }

            return true;
        }

        public void RunScriptCmd(string[] args)
        {
            switch (args[0])
            {
                case "load":
                    Compile(args[1]);
                    break;

                default:
                    MainLog.Instance.Error("Unknown script command");
                    break;
            }
        }

        public bool AddPreCompiledScript(IScript script)
        {
            MainLog.Instance.Verbose("Loading script " + script.Name);
            ScriptInfo scriptInfo = new ScriptInfo(m_scene); // Since each script could potentially corrupt their access with a stray assignment, making a new one for each script.
            script.Initialise(scriptInfo);
            scripts.Add(script);

            return true;
        }
    }

    interface IScriptCompiler
    {
        Dictionary<string, IScript> compile(string filename);
        string FileExt();
    }
}