using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using System.Xml;
#if CLIENT
using Microsoft.Xna.Framework.Graphics;
using Barotrauma.Tutorials;
#endif
using System;

namespace Barotrauma
{
    public enum WindowMode
    {
        Windowed, Fullscreen, BorderlessWindowed
    }

    public enum LosMode
    {
        None,
        Transparent,
        Opaque
    }

    public partial class GameSettings
    {
        const string FilePath = "config.xml";

        public int GraphicsWidth { get; set; }
        public int GraphicsHeight { get; set; }

        public bool VSyncEnabled { get; set; }

        public bool EnableSplashScreen { get; set; }
        
        public int ParticleLimit { get; set; }

        public float LightMapScale { get; set; }
        public bool SpecularityEnabled { get; set; }
        public bool ChromaticAberrationEnabled { get; set; }

        private KeyOrMouse[] keyMapping;

        private WindowMode windowMode;

        private LosMode losMode;

        public List<string> jobPreferences;

        private bool useSteamMatchmaking;
        private bool requireSteamAuthentication;

        public string QuickStartSubmarineName
        {
            get;
            set;
        }

#if DEBUG
        //steam functionality can be enabled/disabled in debug builds
        public bool UseSteam;
        public bool RequireSteamAuthentication
        {
            get { return requireSteamAuthentication && UseSteam; }
            set { requireSteamAuthentication = value; }
        }
        public bool UseSteamMatchmaking
        {
            get { return useSteamMatchmaking && UseSteam; }
            set { useSteamMatchmaking = value; }
        }

#else
        //steam functionality determined at compile time
        public bool UseSteam
        {
            get { return Steam.SteamManager.USE_STEAM; }
        }
        public bool RequireSteamAuthentication
        {
            get { return requireSteamAuthentication && Steam.SteamManager.USE_STEAM; }
            set { requireSteamAuthentication = value; }
        }
        public bool UseSteamMatchmaking
        {
            get { return useSteamMatchmaking && Steam.SteamManager.USE_STEAM; }
            set { useSteamMatchmaking = value; }
        }
#endif

        public WindowMode WindowMode
        {
            get { return windowMode; }
            set { windowMode = value; }
        }

        public List<string> JobPreferences
        {
            get { return jobPreferences; }
            set { jobPreferences = value; }
        }

        public int CharacterHeadIndex { get; set; }
        public int CharacterHairIndex { get; set; }
        public int CharacterBeardIndex { get; set; }
        public int CharacterMoustacheIndex { get; set; }
        public int CharacterFaceAttachmentIndex { get; set; }

        public Gender CharacterGender { get; set; }
        public Race CharacterRace { get; set; }

        private float aimAssistAmount;
        public float AimAssistAmount
        {
            get { return aimAssistAmount; }
            set { aimAssistAmount = MathHelper.Clamp(value, 0.0f, 5.0f); }
        }

        private bool unsavedSettings;
        public bool UnsavedSettings
        {
            get
            {
                return unsavedSettings;
            }
            private set
            {
                unsavedSettings = value;
#if CLIENT
                if (applyButton != null)
                {
                    //applyButton.Selected = unsavedSettings;
                    applyButton.Enabled = unsavedSettings;
                    applyButton.Text = unsavedSettings ? "Apply*" : "Apply";
                }
#endif
            }
        }

        private float soundVolume, musicVolume;

        public float SoundVolume
        {
            get { return soundVolume; }
            set
            {
                soundVolume = MathHelper.Clamp(value, 0.0f, 1.0f);
#if CLIENT
                if (GameMain.SoundManager != null)
                {
                    GameMain.SoundManager.SetCategoryGainMultiplier("default", soundVolume);
                    GameMain.SoundManager.SetCategoryGainMultiplier("ui", soundVolume);
                    GameMain.SoundManager.SetCategoryGainMultiplier("waterambience", soundVolume);
                }
#endif
            }
        }

        public float MusicVolume
        {
            get { return musicVolume; }
            set
            {
                musicVolume = MathHelper.Clamp(value, 0.0f, 1.0f);
#if CLIENT
                GameMain.SoundManager?.SetCategoryGainMultiplier("music", musicVolume);
#endif
            }
        }

        public string Language
        {
            get { return TextManager.Language; }
            set { TextManager.Language = value; }
        }

        public HashSet<ContentPackage> SelectedContentPackages { get; set; }

        public string   MasterServerUrl { get; set; }
        public bool     AutoCheckUpdates { get; set; }
        public bool     WasGameUpdated { get; set; }

        private string defaultPlayerName;
        public string DefaultPlayerName
        {
            get
            {
                return defaultPlayerName ?? "";
            }
            set
            {
                if (defaultPlayerName != value)
                {
                    defaultPlayerName = value;
                }
            }
        }

        public LosMode LosMode
        {
            get { return losMode; }
            set { losMode = value; }
        }

        private const float MinHUDScale = 0.75f, MaxHUDScale = 1.25f;
        public static float HUDScale { get; set; } = 1.0f;
        private const float MinInventoryScale = 0.75f, MaxInventoryScale = 1.25f;
        public static float InventoryScale { get; set; } = 1.0f;

        public List<string> CompletedTutorialNames { get; private set; }

        public static bool VerboseLogging { get; set; }
        public static bool SaveDebugConsoleLogs { get; set; }

        private static bool sendUserStatistics;
        public static bool SendUserStatistics
        {
            get { return sendUserStatistics; }
            set
            {
                sendUserStatistics = value;
                GameMain.Config.Save();
            }
        }
        public static bool ShowUserStatisticsPrompt { get; set; }

        public GameSettings(string filePath)
        {
            SelectedContentPackages = new HashSet<ContentPackage>();

            ContentPackage.LoadAll(ContentPackage.Folder);
            CompletedTutorialNames = new List<string>();
            Load(filePath);
        }

        public void Load(string filePath)
        {
            XDocument doc = XMLExtensions.TryLoadXml(filePath);
            
            Language = doc.Root.GetAttributeString("language", "English");

            MasterServerUrl = doc.Root.GetAttributeString("masterserverurl", "");

            AutoCheckUpdates = doc.Root.GetAttributeBool("autocheckupdates", true);
            WasGameUpdated = doc.Root.GetAttributeBool("wasgameupdated", false);

            VerboseLogging = doc.Root.GetAttributeBool("verboselogging", false);
            SaveDebugConsoleLogs = doc.Root.GetAttributeBool("savedebugconsolelogs", false);
            if (doc.Root.Attribute("senduserstatistics") == null)
            {
                ShowUserStatisticsPrompt = true;
            }
            else
            {
                sendUserStatistics = doc.Root.GetAttributeBool("senduserstatistics", true);
            }

#if DEBUG
            UseSteam = doc.Root.GetAttributeBool("usesteam", true);
#endif
            QuickStartSubmarineName = doc.Root.GetAttributeString("quickstartsub", "");

            if (doc == null)
            {
                GraphicsWidth = 1024;
                GraphicsHeight = 678;

                MasterServerUrl = "";

                SelectedContentPackages.Add(ContentPackage.List.Any() ? ContentPackage.List[0] : new ContentPackage(""));

                jobPreferences = new List<string>();
                foreach (JobPrefab job in JobPrefab.List)
                {
                    jobPreferences.Add(job.Identifier);
                }
                return;
            }

            XElement graphicsMode = doc.Root.Element("graphicsmode");
            GraphicsWidth   = graphicsMode.GetAttributeInt("width", 0);
            GraphicsHeight  = graphicsMode.GetAttributeInt("height", 0);
            VSyncEnabled    = graphicsMode.GetAttributeBool("vsync", true);

            XElement graphicsSettings = doc.Root.Element("graphicssettings");
            ParticleLimit               = graphicsSettings.GetAttributeInt("particlelimit", 1500);
            LightMapScale               = MathHelper.Clamp(graphicsSettings.GetAttributeFloat("lightmapscale", 0.5f), 0.1f, 1.0f);
            SpecularityEnabled          = graphicsSettings.GetAttributeBool("specularity", true);
            ChromaticAberrationEnabled  = graphicsSettings.GetAttributeBool("chromaticaberration", true);
            HUDScale                    = graphicsSettings.GetAttributeFloat("hudscale", 1.0f);
            InventoryScale              = graphicsSettings.GetAttributeFloat("inventoryscale", 1.0f);
            var losModeStr              = graphicsSettings.GetAttributeString("losmode", "Transparent");
            if (!Enum.TryParse(losModeStr, out losMode))
            {
                losMode = LosMode.Transparent;
            }

#if CLIENT
            if (GraphicsWidth == 0 || GraphicsHeight == 0)
            {
                GraphicsWidth = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width;
                GraphicsHeight = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Height;
            }
#endif

            //FullScreenEnabled = ToolBox.GetAttributeBool(graphicsMode, "fullscreen", true);

            var windowModeStr = graphicsMode.GetAttributeString("displaymode", "Fullscreen");
            if (!Enum.TryParse<WindowMode>(windowModeStr, out windowMode))
            {
                windowMode = WindowMode.Fullscreen;
            }

            SoundVolume = doc.Root.GetAttributeFloat("soundvolume", 1.0f);
            MusicVolume = doc.Root.GetAttributeFloat("musicvolume", 0.3f);

            useSteamMatchmaking = doc.Root.GetAttributeBool("usesteammatchmaking", true);
            requireSteamAuthentication = doc.Root.GetAttributeBool("requiresteamauthentication", true);

            EnableSplashScreen = doc.Root.GetAttributeBool("enablesplashscreen", true);

            AimAssistAmount = doc.Root.GetAttributeFloat("aimassistamount", 0.5f);
            
            keyMapping = new KeyOrMouse[Enum.GetNames(typeof(InputType)).Length];
            keyMapping[(int)InputType.Up] = new KeyOrMouse(Keys.W);
            keyMapping[(int)InputType.Down] = new KeyOrMouse(Keys.S);
            keyMapping[(int)InputType.Left] = new KeyOrMouse(Keys.A);
            keyMapping[(int)InputType.Right] = new KeyOrMouse(Keys.D);
            keyMapping[(int)InputType.Run] = new KeyOrMouse(Keys.LeftShift);

            keyMapping[(int)InputType.Chat] = new KeyOrMouse(Keys.Tab);
            keyMapping[(int)InputType.RadioChat] = new KeyOrMouse(Keys.OemPipe);
            keyMapping[(int)InputType.CrewOrders] = new KeyOrMouse(Keys.C);

            keyMapping[(int)InputType.Select] = new KeyOrMouse(Keys.E);

            keyMapping[(int)InputType.SelectNextCharacter] = new KeyOrMouse(Keys.Tab);
            keyMapping[(int)InputType.SelectPreviousCharacter] = new KeyOrMouse(Keys.Q);

            keyMapping[(int)InputType.Use] = new KeyOrMouse(0);
            keyMapping[(int)InputType.Aim] = new KeyOrMouse(1);

            foreach (XElement subElement in doc.Root.Elements())
            {
                switch (subElement.Name.ToString().ToLowerInvariant())
                {
                    case "keymapping":
                        foreach (XAttribute attribute in subElement.Attributes())
                        {
                            if (Enum.TryParse(attribute.Name.ToString(), true, out InputType inputType))
                            {
                                if (int.TryParse(attribute.Value.ToString(), out int mouseButton))
                                {
                                    keyMapping[(int)inputType] = new KeyOrMouse(mouseButton);
                                }
                                else
                                {
                                    if (Enum.TryParse(attribute.Value.ToString(), true, out Keys key))
                                    {
                                        keyMapping[(int)inputType] = new KeyOrMouse(key);
                                    }
                                }
                            }
                        }
                        break;
                    case "gameplay":
                        jobPreferences = new List<string>();
                        foreach (XElement ele in subElement.Element("jobpreferences").Elements("job"))
                        {
                            string jobIdentifier = ele.GetAttributeString("identifier", "");
                            if (string.IsNullOrEmpty(jobIdentifier)) continue;
                            jobPreferences.Add(jobIdentifier);
                        }
                        break;
                    case "player":
                        defaultPlayerName = subElement.GetAttributeString("name", "");
                        CharacterHeadIndex = subElement.GetAttributeInt("headindex", Rand.Int(10));
                        CharacterGender = subElement.GetAttributeString("gender", Rand.Range(0.0f, 1.0f) < 0.5f ? "male" : "female")
                            .ToLowerInvariant() == "male" ? Gender.Male : Gender.Female;
                        if (Enum.TryParse(subElement.GetAttributeString("race", "white"), true, out Race r))
                        {
                            CharacterRace = r;
                        }
                        CharacterHairIndex = subElement.GetAttributeInt("hairindex", -1);
                        CharacterBeardIndex = subElement.GetAttributeInt("beardindex", -1);
                        CharacterMoustacheIndex = subElement.GetAttributeInt("moustacheindex", -1);
                        CharacterFaceAttachmentIndex = subElement.GetAttributeInt("faceattachmentindex", -1);
                        break;
                    case "tutorials":
                        foreach (XElement tutorialElement in subElement.Elements())
                        {
                            CompletedTutorialNames.Add(tutorialElement.GetAttributeString("name", ""));
                        }
                        break;
                }
            }

            foreach (InputType inputType in Enum.GetValues(typeof(InputType)))
            {
                if (keyMapping[(int)inputType] == null)
                {
                    DebugConsole.ThrowError("Key binding for the input type \"" + inputType + " not set!");
                    keyMapping[(int)inputType] = new KeyOrMouse(Keys.D1);
                }
            }
            
            UnsavedSettings = false;

            bool invalidPackagesFound = false;
            foreach (XElement subElement in doc.Root.Elements())
            {
                switch (subElement.Name.ToString().ToLowerInvariant())
                {
                    case "contentpackage":
                        string path = System.IO.Path.GetFullPath(subElement.GetAttributeString("path", ""));
                        var matchingContentPackage = ContentPackage.List.Find(cp => System.IO.Path.GetFullPath(cp.Path) == path);
                        if (matchingContentPackage == null)
                        {
                            DebugConsole.ThrowError(TextManager.Get("ContentPackageNotFound").Replace("[packagepath]", path), createMessageBox: true);
                        }
                        else if (!matchingContentPackage.IsCompatible())
                        {
                            invalidPackagesFound = true;
                            DebugConsole.ThrowError(
                                TextManager.Get(matchingContentPackage.GameVersion <= new Version(0, 0, 0, 0) ? "IncompatibleContentPackageUnknownVersion" : "IncompatibleContentPackage")
                                    .Replace("[packagename]", matchingContentPackage.Name)
                                    .Replace("[packageversion]", matchingContentPackage.GameVersion.ToString())
                                    .Replace("[gameversion]", GameMain.Version.ToString()),
                                createMessageBox: true);
                        }
                        else
                        {
                            invalidPackagesFound = true;
                            SelectedContentPackages.Add(matchingContentPackage);
                        }
                        break;
                }
            }

            foreach (ContentPackage contentPackage in SelectedContentPackages)
            {
                foreach (ContentFile file in contentPackage.Files)
                {
                    if (!System.IO.File.Exists(file.Path))
                    {
                        DebugConsole.ThrowError("Error in content package \"" + contentPackage.Name + "\" - file \"" + file.Path + "\" not found.");
                        continue;
                    }
                    ToolBox.IsProperFilenameCase(file.Path);
                }
            }
            if (!SelectedContentPackages.Any())
            {
                var availablePackage = ContentPackage.List.FirstOrDefault(cp => cp.IsCompatible() && cp.CorePackage);
                if (availablePackage != null)
                {
                    SelectedContentPackages.Add(availablePackage);
                }
            }

            //save to get rid of the invalid selected packages in the config file
            if (invalidPackagesFound) { Save(); }
        }
        
        public KeyOrMouse KeyBind(InputType inputType)
        {
            return keyMapping[(int)inputType];
        }

        public void Save()
        {
            UnsavedSettings = false;

            XDocument doc = new XDocument();

            if (doc.Root == null)
            {
                doc.Add(new XElement("config"));
            }

            doc.Root.Add(
                new XAttribute("language", TextManager.Language),
                new XAttribute("masterserverurl", MasterServerUrl),
                new XAttribute("autocheckupdates", AutoCheckUpdates),
                new XAttribute("musicvolume", musicVolume),
                new XAttribute("soundvolume", soundVolume),
                new XAttribute("verboselogging", VerboseLogging),
                new XAttribute("savedebugconsolelogs", SaveDebugConsoleLogs),
                new XAttribute("enablesplashscreen", EnableSplashScreen),
                new XAttribute("usesteammatchmaking", useSteamMatchmaking),
                new XAttribute("quickstartsub", QuickStartSubmarineName),
                new XAttribute("requiresteamauthentication", requireSteamAuthentication),
                new XAttribute("aimassistamount", aimAssistAmount));

            if (!ShowUserStatisticsPrompt)
            {
                doc.Root.Add(new XAttribute("senduserstatistics", sendUserStatistics));
            }

            if (WasGameUpdated)
            {
                doc.Root.Add(new XAttribute("wasgameupdated", true));
            }

            XElement gMode = doc.Root.Element("graphicsmode");
            if (gMode == null)
            {
                gMode = new XElement("graphicsmode");
                doc.Root.Add(gMode);
            }

            if (GraphicsWidth == 0 || GraphicsHeight == 0)
            {
                gMode.ReplaceAttributes(new XAttribute("displaymode", windowMode));
            }
            else
            {
                gMode.ReplaceAttributes(
                    new XAttribute("width", GraphicsWidth),
                    new XAttribute("height", GraphicsHeight),
                    new XAttribute("vsync", VSyncEnabled),
                    new XAttribute("displaymode", windowMode));
            }

            XElement gSettings = doc.Root.Element("graphicssettings");
            if (gSettings == null)
            {
                gSettings = new XElement("graphicssettings");
                doc.Root.Add(gSettings);
            }

            gSettings.ReplaceAttributes(
                new XAttribute("particlelimit", ParticleLimit),
                new XAttribute("lightmapscale", LightMapScale),
                new XAttribute("specularity", SpecularityEnabled),
                new XAttribute("chromaticaberration", ChromaticAberrationEnabled),
                new XAttribute("losmode", LosMode),
                new XAttribute("hudscale", HUDScale),
                new XAttribute("inventoryscale", InventoryScale));

            foreach (ContentPackage contentPackage in SelectedContentPackages)
            {
                doc.Root.Add(new XElement("contentpackage",
                    new XAttribute("path", contentPackage.Path)));
            }

            var keyMappingElement = new XElement("keymapping");
            doc.Root.Add(keyMappingElement);
            for (int i = 0; i < keyMapping.Length; i++)
            {
                if (keyMapping[i].MouseButton == null)
                {
                    keyMappingElement.Add(new XAttribute(((InputType)i).ToString(), keyMapping[i].Key));
                }
                else
                {
                    keyMappingElement.Add(new XAttribute(((InputType)i).ToString(), keyMapping[i].MouseButton));
                }
            }

            var gameplay = new XElement("gameplay");
            var jobPreferences = new XElement("jobpreferences");
            foreach (string jobName in JobPreferences)
            {
                jobPreferences.Add(new XElement("job", new XAttribute("identifier", jobName)));
            }
            gameplay.Add(jobPreferences);
            doc.Root.Add(gameplay);

            var playerElement = new XElement("player",
                new XAttribute("name", defaultPlayerName ?? ""),
                new XAttribute("headindex", CharacterHeadIndex),
                new XAttribute("gender", CharacterGender),
                new XAttribute("race", CharacterRace),
                new XAttribute("hairindex", CharacterHairIndex),
                new XAttribute("beardindex", CharacterBeardIndex),
                new XAttribute("moustacheindex", CharacterMoustacheIndex),
                new XAttribute("faceattachmentindex", CharacterFaceAttachmentIndex));
            doc.Root.Add(playerElement);
            
#if CLIENT
            if (Tutorial.Tutorials != null)
            {
                foreach (Tutorial tutorial in Tutorial.Tutorials)
                {
                    if (tutorial.Completed && !CompletedTutorialNames.Contains(tutorial.Name))
                    {
                        CompletedTutorialNames.Add(tutorial.Name);
                    }
                }
            }
#endif
            var tutorialElement = new XElement("tutorials");
            foreach (string tutorialName in CompletedTutorialNames)
            {
                tutorialElement.Add(new XElement("Tutorial", new XAttribute("name", tutorialName)));
            }
            doc.Root.Add(tutorialElement);
            
            XmlWriterSettings settings = new XmlWriterSettings
            {
                Indent = true,
                OmitXmlDeclaration = true,
                NewLineOnAttributes = true
            };

            try
            {
                using (var writer = XmlWriter.Create(FilePath, settings))
                {
                    doc.WriteTo(writer);
                    writer.Flush();
                }
            }
            catch (Exception e)
            {
                DebugConsole.ThrowError("Saving game settings failed.", e);
                GameAnalyticsManager.AddErrorEventOnce("GameSettings.Save:SaveFailed", GameAnalyticsSDK.Net.EGAErrorSeverity.Error,
                    "Saving game settings failed.\n" + e.Message + "\n" + e.StackTrace);
            }
        }
    }
}