using DiscordRPC;
using LibHac.Tools.FsSystem;
using Ryujinx.Audio.Backends.SDL2;
using Ryujinx.Ava;
using Ryujinx.Ava.Utilities.Configuration;
using Ryujinx.Common.Configuration;
using Ryujinx.Common.Configuration.Hid;
using Ryujinx.Common.Configuration.Hid.Controller;
using Ryujinx.Common.Configuration.Hid.Controller.Motion;
using Ryujinx.Common.Configuration.Hid.Keyboard;
using Ryujinx.Common.Logging;
using Ryujinx.Common.Utilities;
using Ryujinx.Graphics.GAL;
using Ryujinx.Graphics.GAL.Multithreading;
using Ryujinx.Graphics.Metal;
using Ryujinx.Graphics.OpenGL;
using Ryujinx.Graphics.Vulkan;
using Ryujinx.HLE;
using Ryujinx.Input;
using Silk.NET.Vulkan;
using System;
using System.IO;
using System.Text.Json;
using System.Threading.Tasks;
using ConfigGamepadInputId = Ryujinx.Common.Configuration.Hid.Controller.GamepadInputId;
using ConfigStickInputId = Ryujinx.Common.Configuration.Hid.Controller.StickInputId;
using Key = Ryujinx.Common.Configuration.Hid.Key;

namespace Ryujinx.Headless
{
    public partial class HeadlessRyujinx
    {
        public static void Initialize()
        {
            // Ensure Discord presence timestamp begins at the absolute start of when Ryujinx is launched
            DiscordIntegrationModule.StartedAt = Timestamps.Now;

            // Delete backup files after updating.
            Task.Run(Updater.CleanupUpdate);

            // Hook unhandled exception and process exit events.
            AppDomain.CurrentDomain.UnhandledException += (sender, e)
                => Program.ProcessUnhandledException(sender, e.ExceptionObject as Exception, e.IsTerminating);
            AppDomain.CurrentDomain.ProcessExit += (_, _) => Program.Exit();

            // Initialize the configuration.
            ConfigurationState.Initialize();

            // Initialize Discord integration.
            DiscordIntegrationModule.Initialize();

            // Logging system information.
            Program.PrintSystemInfo();
        }
        
        private static InputConfig HandlePlayerConfiguration(string inputProfileName, string inputId, PlayerIndex index)
        {
            if (inputId == null)
            {
                if (index == PlayerIndex.Player1)
                {
                    Logger.Info?.Print(LogClass.Application, $"{index} not configured, defaulting to default keyboard.");

                    // Default to keyboard
                    inputId = "0";
                }
                else
                {
                    Logger.Info?.Print(LogClass.Application, $"{index} not configured");

                    return null;
                }
            }

            IGamepad gamepad = _inputManager.KeyboardDriver.GetGamepad(inputId);

            bool isKeyboard = true;

            if (gamepad == null)
            {
                gamepad = _inputManager.GamepadDriver.GetGamepad(inputId);
                isKeyboard = false;

                if (gamepad == null)
                {
                    Logger.Error?.Print(LogClass.Application, $"{index} gamepad not found (\"{inputId}\")");

                    return null;
                }
            }

            string gamepadName = gamepad.Name;

            gamepad.Dispose();

            InputConfig config;

            if (inputProfileName == null || inputProfileName.Equals("default"))
            {
                if (isKeyboard)
                {
                    config = new StandardKeyboardInputConfig
                    {
                        Version = InputConfig.CurrentVersion,
                        Backend = InputBackendType.WindowKeyboard,
                        Id = null,
                        ControllerType = ControllerType.JoyconPair,
                        LeftJoycon = new LeftJoyconCommonConfig<Key>
                        {
                            DpadUp = Key.Up,
                            DpadDown = Key.Down,
                            DpadLeft = Key.Left,
                            DpadRight = Key.Right,
                            ButtonMinus = Key.Minus,
                            ButtonL = Key.E,
                            ButtonZl = Key.Q,
                            ButtonSl = Key.Unbound,
                            ButtonSr = Key.Unbound,
                        },

                        LeftJoyconStick = new JoyconConfigKeyboardStick<Key>
                        {
                            StickUp = Key.W,
                            StickDown = Key.S,
                            StickLeft = Key.A,
                            StickRight = Key.D,
                            StickButton = Key.F,
                        },

                        RightJoycon = new RightJoyconCommonConfig<Key>
                        {
                            ButtonA = Key.Z,
                            ButtonB = Key.X,
                            ButtonX = Key.C,
                            ButtonY = Key.V,
                            ButtonPlus = Key.Plus,
                            ButtonR = Key.U,
                            ButtonZr = Key.O,
                            ButtonSl = Key.Unbound,
                            ButtonSr = Key.Unbound,
                        },

                        RightJoyconStick = new JoyconConfigKeyboardStick<Key>
                        {
                            StickUp = Key.I,
                            StickDown = Key.K,
                            StickLeft = Key.J,
                            StickRight = Key.L,
                            StickButton = Key.H,
                        },
                    };
                }
                else
                {
                    bool isNintendoStyle = gamepadName.Contains("Nintendo");

                    config = new StandardControllerInputConfig
                    {
                        Version = InputConfig.CurrentVersion,
                        Backend = InputBackendType.GamepadSDL2,
                        Id = null,
                        ControllerType = ControllerType.JoyconPair,
                        DeadzoneLeft = 0.1f,
                        DeadzoneRight = 0.1f,
                        RangeLeft = 1.0f,
                        RangeRight = 1.0f,
                        TriggerThreshold = 0.5f,
                        LeftJoycon = new LeftJoyconCommonConfig<ConfigGamepadInputId>
                        {
                            DpadUp = ConfigGamepadInputId.DpadUp,
                            DpadDown = ConfigGamepadInputId.DpadDown,
                            DpadLeft = ConfigGamepadInputId.DpadLeft,
                            DpadRight = ConfigGamepadInputId.DpadRight,
                            ButtonMinus = ConfigGamepadInputId.Minus,
                            ButtonL = ConfigGamepadInputId.LeftShoulder,
                            ButtonZl = ConfigGamepadInputId.LeftTrigger,
                            ButtonSl = ConfigGamepadInputId.Unbound,
                            ButtonSr = ConfigGamepadInputId.Unbound,
                        },

                        LeftJoyconStick = new JoyconConfigControllerStick<ConfigGamepadInputId, ConfigStickInputId>
                        {
                            Joystick = ConfigStickInputId.Left,
                            StickButton = ConfigGamepadInputId.LeftStick,
                            InvertStickX = false,
                            InvertStickY = false,
                            Rotate90CW = false,
                        },

                        RightJoycon = new RightJoyconCommonConfig<ConfigGamepadInputId>
                        {
                            ButtonA = isNintendoStyle ? ConfigGamepadInputId.A : ConfigGamepadInputId.B,
                            ButtonB = isNintendoStyle ? ConfigGamepadInputId.B : ConfigGamepadInputId.A,
                            ButtonX = isNintendoStyle ? ConfigGamepadInputId.X : ConfigGamepadInputId.Y,
                            ButtonY = isNintendoStyle ? ConfigGamepadInputId.Y : ConfigGamepadInputId.X,
                            ButtonPlus = ConfigGamepadInputId.Plus,
                            ButtonR = ConfigGamepadInputId.RightShoulder,
                            ButtonZr = ConfigGamepadInputId.RightTrigger,
                            ButtonSl = ConfigGamepadInputId.Unbound,
                            ButtonSr = ConfigGamepadInputId.Unbound,
                        },

                        RightJoyconStick = new JoyconConfigControllerStick<ConfigGamepadInputId, ConfigStickInputId>
                        {
                            Joystick = ConfigStickInputId.Right,
                            StickButton = ConfigGamepadInputId.RightStick,
                            InvertStickX = false,
                            InvertStickY = false,
                            Rotate90CW = false,
                        },

                        Motion = new StandardMotionConfigController
                        {
                            MotionBackend = MotionInputBackendType.GamepadDriver,
                            EnableMotion = true,
                            Sensitivity = 100,
                            GyroDeadzone = 1,
                        },
                        Rumble = new RumbleConfigController
                        {
                            StrongRumble = 1f,
                            WeakRumble = 1f,
                            EnableRumble = false,
                        },
                    };
                }
            }
            else
            {
                string profileBasePath;

                if (isKeyboard)
                {
                    profileBasePath = Path.Combine(AppDataManager.ProfilesDirPath, "keyboard");
                }
                else
                {
                    profileBasePath = Path.Combine(AppDataManager.ProfilesDirPath, "controller");
                }

                string path = Path.Combine(profileBasePath, inputProfileName + ".json");

                if (!File.Exists(path))
                {
                    Logger.Error?.Print(LogClass.Application, $"Input profile \"{inputProfileName}\" not found for \"{inputId}\"");

                    return null;
                }

                try
                {
                    config = JsonHelper.DeserializeFromFile(path, _serializerContext.InputConfig);
                }
                catch (JsonException)
                {
                    Logger.Error?.Print(LogClass.Application, $"Input profile \"{inputProfileName}\" parsing failed for \"{inputId}\"");

                    return null;
                }
            }

            config.Id = inputId;
            config.PlayerIndex = index;

            string inputTypeName = isKeyboard ? "Keyboard" : "Gamepad";

            Logger.Info?.Print(LogClass.Application, $"{config.PlayerIndex} configured with {inputTypeName} \"{config.Id}\"");

            // If both stick ranges are 0 (usually indicative of an outdated profile load) then both sticks will be set to 1.0.
            if (config is StandardControllerInputConfig controllerConfig)
            {
                if (controllerConfig.RangeLeft <= 0.0f && controllerConfig.RangeRight <= 0.0f)
                {
                    controllerConfig.RangeLeft = 1.0f;
                    controllerConfig.RangeRight = 1.0f;

                    Logger.Info?.Print(LogClass.Application, $"{config.PlayerIndex} stick range reset. Save the profile now to update your configuration");
                }
            }

            return config;
        }
        
        private static IRenderer CreateRenderer(Options options, WindowBase window)
        {
            if (options.GraphicsBackend == GraphicsBackend.Vulkan && window is VulkanWindow vulkanWindow)
            {
                string preferredGpuId = string.Empty;
                Vk api = Vk.GetApi();

                if (!string.IsNullOrEmpty(options.PreferredGPUVendor))
                {
                    string preferredGpuVendor = options.PreferredGPUVendor.ToLowerInvariant();
                    var devices = VulkanRenderer.GetPhysicalDevices(api);

                    foreach (var device in devices)
                    {
                        if (device.Vendor.ToLowerInvariant() == preferredGpuVendor)
                        {
                            preferredGpuId = device.Id;
                            break;
                        }
                    }
                }

                return new VulkanRenderer(
                    api,
                    (instance, vk) => new SurfaceKHR((ulong)(vulkanWindow.CreateWindowSurface(instance.Handle))),
                    vulkanWindow.GetRequiredInstanceExtensions,
                    preferredGpuId);
            }

            if (options.GraphicsBackend == GraphicsBackend.Metal && window is MetalWindow metalWindow && OperatingSystem.IsMacOS())
            {
                return new MetalRenderer(metalWindow.GetLayer);
            }

            return new OpenGLRenderer();
        }

        private static Switch InitializeEmulationContext(WindowBase window, IRenderer renderer, Options options)
        {
            BackendThreading threadingMode = options.BackendThreading;

            bool threadedGAL = threadingMode == BackendThreading.On || (threadingMode == BackendThreading.Auto && renderer.PreferThreading);

            if (threadedGAL)
            {
                renderer = new ThreadedRenderer(renderer);
            }

            HLEConfiguration configuration = new(_virtualFileSystem,
                _libHacHorizonManager,
                _contentManager,
                _accountManager,
                _userChannelPersistence,
                renderer,
                new SDL2HardwareDeviceDriver(),
                options.DramSize,
                window,
                options.SystemLanguage,
                options.SystemRegion,
                options.VSyncMode,
                !options.DisableDockedMode,
                !options.DisablePTC,
                options.EnableInternetAccess,
                !options.DisableFsIntegrityChecks ? IntegrityCheckLevel.ErrorOnInvalid : IntegrityCheckLevel.None,
                options.FsGlobalAccessLogMode,
                options.SystemTimeOffset,
                options.SystemTimeZone,
                options.MemoryManagerMode,
                options.IgnoreMissingServices,
                options.AspectRatio,
                options.AudioVolume,
                options.UseHypervisor ?? true,
                options.MultiplayerLanInterfaceId,
                Common.Configuration.Multiplayer.MultiplayerMode.Disabled,
                false,
                string.Empty,
                string.Empty,
                options.CustomVSyncInterval);

            return new Switch(configuration);
        }
    }
}
