using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using Microsoft.Win32;

namespace Giants.Launcher
{
    static class GameSettings
    {
        // Constants
        private const string REGISTRY_KEY = @"HKEY_CURRENT_USER\Software\PlanetMoon\Giants";
        private const int OPTIONS_VERSION = 3;

        private static readonly Dictionary<string, object> Settings = new Dictionary<string, object>();

        // List of renderers compatible with the user's system.
        static public List<RendererInterop.Capabilities> CompatibleRenderers;

        public static object Get(string settingName)
        {
            if (Settings.ContainsKey(settingName))
                return Settings[settingName];
            else
                return 0;

        }

        public static void Modify(string settingName, object settingValue)
        {
            Settings[settingName] = settingValue;
        }

        public static void SetDefaults(string gamePath)
        {
            // Set default settings:
            Settings["Renderer"] = "gg_dx7r.dll";
            Settings["Antialiasing"] = 0;
            Settings["AnisotropicFiltering"] = 0;
            Settings["VideoWidth"] = 640;
            Settings["VideoHeight"] = 480;
            Settings["VideoDepth"] = 32;
            Settings["Windowed"] = 0;
            Settings["BorderlessWindow"] = 0;
            Settings["VerticalSync"] = 1;
            Settings["TripleBuffering"] = 1;
            Settings["NoAutoUpdate"] = 0;

            // Get a list of renderers compatible with the user's system
            if (CompatibleRenderers == null)
            {
                CompatibleRenderers = RendererInterop.GetCompatibleRenderers(gamePath);
                if (CompatibleRenderers.Count == 0)
                {
                    MessageBox.Show(
                        "Could not locate any renderers compatible with your system. " +
                        "The most compatible renderer has been selected, but you may experience difficulty running the game.",
                        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }

            // Select the highest priority renderer
            if (CompatibleRenderers.Count > 0)
                Settings["Renderer"] = Path.GetFileName(CompatibleRenderers.Max().FilePath);

            // Set the current desktop resolution, leaving bit depth at the default 32:
            Settings["VideoWidth"] = Screen.PrimaryScreen.Bounds.Width;
            Settings["VideoHeight"] = Screen.PrimaryScreen.Bounds.Height;
        }

        public static void Load(string gamePath)
        {
            SetDefaults(gamePath);

            if ((int)Registry.GetValue(REGISTRY_KEY, "GameOptionsVersion", 0) == OPTIONS_VERSION)
            {
                try
                {
                    Settings["Renderer"] = RegistryExtensions.GetValue(REGISTRY_KEY, "Renderer", Settings["Renderer"], typeof(string));
                    Settings["Antialiasing"] = RegistryExtensions.GetValue(REGISTRY_KEY, "Antialiasing", Settings["Antialiasing"], typeof(int));
                    Settings["AnisotropicFiltering"] = RegistryExtensions.GetValue(REGISTRY_KEY, "AnisotropicFiltering", Settings["AnisotropicFiltering"], typeof(int));
                    Settings["VideoWidth"] = RegistryExtensions.GetValue(REGISTRY_KEY, "VideoWidth", Settings["VideoWidth"], typeof(int));
                    Settings["VideoHeight"] = RegistryExtensions.GetValue(REGISTRY_KEY, "VideoHeight", Settings["VideoHeight"], typeof(int));
                    Settings["VideoDepth"] = RegistryExtensions.GetValue(REGISTRY_KEY, "VideoDepth", Settings["VideoDepth"], typeof(int));
                    Settings["Windowed"] = RegistryExtensions.GetValue(REGISTRY_KEY, "Windowed", Settings["Windowed"], typeof(int));
                    Settings["BorderlessWindow"] = RegistryExtensions.GetValue(REGISTRY_KEY, "BorderlessWindow", Settings["BorderlessWindow"], typeof(int));
                    Settings["VerticalSync"] = RegistryExtensions.GetValue(REGISTRY_KEY, "VerticalSync", Settings["VerticalSync"], typeof(int));
                    Settings["TripleBuffering"] = RegistryExtensions.GetValue(REGISTRY_KEY, "TripleBuffering", Settings["TripleBuffering"], typeof(int));
                    Settings["NoAutoUpdate"] = RegistryExtensions.GetValue(REGISTRY_KEY, "NoAutoUpdate", Settings["NoAutoUpdate"], typeof(int));
                }
                catch (Exception ex)
                {
                    MessageBox.Show(string.Format("Could not read game settings from registry!\n\nReason: {0}", ex.Message));
                }
            }
        }

        public static void Save()
        {
            try
            {
                Registry.SetValue(REGISTRY_KEY, "GameOptionsVersion", 3, RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "Renderer", Settings["Renderer"], RegistryValueKind.String);
                Registry.SetValue(REGISTRY_KEY, "Antialiasing", Settings["Antialiasing"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "AnisotropicFiltering", Settings["AnisotropicFiltering"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "VideoWidth", Settings["VideoWidth"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "VideoHeight", Settings["VideoHeight"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "VideoDepth", Settings["VideoDepth"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "Windowed", Settings["Windowed"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "BorderlessWindow", Settings["BorderlessWindow"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "VerticalSync", Settings["VerticalSync"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "TripleBuffering", Settings["TripleBuffering"], RegistryValueKind.DWord);
                Registry.SetValue(REGISTRY_KEY, "NoAutoUpdate", Settings["NoAutoUpdate"], RegistryValueKind.DWord);
            }
            catch (Exception ex)
            {
                MessageBox.Show(string.Format("Could not save game settings to registry!\n\nReason: {0}", ex.Message));
            }
        }
    }
}