using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DynamicLink
{
    public static class Modules
    {
        private static bool foundSolution = false;

        private static List<ModuleInternal> items = new List<ModuleInternal>();
        public static List<ModuleInternal> Items
        {
            get { return items; }
        }

        #region Useful routines
        public static void RegisterModule(string name, string path, string description = null, System.Drawing.Icon icon = null)
        {
            if (!IsRegistered(name)) 
                items.Add(new ModuleInternal() { Name = name, Description = description, Path = path, Icon = icon });

            else if (foundSolution == true)
            {
                int index = 0;
                for (int i = 0; i < items.Count; i++)
                    if (items[i].Name == name) index = i;

                // If new file is an object file, don't allow
                if (path.ToLower().Contains("obj")) return;

                // If it is an object file, it won't work, replace it
                if (items[index].Path.ToLower().Contains("obj"))
                {
                    // Replace
                    items[index] = new ModuleInternal() { Name = name, Description = description, Path = path, Icon = icon };
                    return;
                }

                // If newer, replace
                DateTime neww = System.IO.File.GetCreationTime(path);
                DateTime old = System.IO.File.GetCreationTime(items[index].Path);

                if (old < neww) 
                    items[index] = new ModuleInternal() { Name = name, Description = description, Path = path, Icon = icon };
            }
        }

        public static bool IsRegistered(string name)
        {
            var list = items.Where(x => x.Name == name);
            return (list.Count() != 0);
        }

        public static void ExecuteModule(string name, string args = "")
        {
            var list = items.Where(x => x.Name == name);
            if (list.Count() == 0) return;

            System.Diagnostics.Process.Start(list.First().Path, args);
        }
        #endregion

        #region Collect data
        private static string[] CollectData_GetFileList()
        {
            List<string> files = new List<string>();

            // Try to find files in the current solution
            string dir = System.Reflection.Assembly.GetExecutingAssembly().Location;
            int find = dir.IndexOf("TibisMathematicsSuite\\");

            // Success
            if (find != -1)
            {
                string temp = dir.Remove(find) + "TibisMathematicsSuite\\";
                files.AddRange (System.IO.Directory.GetFiles(temp, "*.exe", System.IO.SearchOption.AllDirectories));

                foundSolution = true;
            }

            // Fail, just add current directory
            else files.AddRange(System.IO.Directory.GetFiles(System.IO.Directory.GetCurrentDirectory(), "*.exe", System.IO.SearchOption.AllDirectories));
        
            return files.ToArray();
        }

        public static void CollectData()
        {
            string[] list = CollectData_GetFileList();

            foreach (var i in list)
            {
                System.Diagnostics.FileVersionInfo info = System.Diagnostics.FileVersionInfo.GetVersionInfo(i);
                if (info.ProductName == "Tibi's Mathematics Suite")
                    RegisterModule(info.FileDescription, i, info.Comments, System.Drawing.Icon.ExtractAssociatedIcon(i));
            }
        }

        #endregion
    }
}