using Barotrauma.Items.Components;
using Microsoft.Xna.Framework;
using System;
using System.Linq;
using System.Xml.Linq;

namespace Barotrauma
{
    partial class GameSession
    {
        public enum InfoFrameTab { Crew, Mission, ManagePlayers };

        public readonly EventManager EventManager;
        
        public GameMode GameMode;

        //two locations used as the start and end in the MP mode
        private Location[] dummyLocations;

        private string savePath;

        private Submarine submarine;
        
        public CrewManager CrewManager;

        public double RoundStartTime;

        private Mission currentMission;

        public Mission Mission
        {
            get
            {
                return currentMission;
            }
        }

        private Level level;

        public Level Level
        {
            get { return level; }
        }

        public Map Map
        {
            get
            {
                return (GameMode as CampaignMode)?.Map;
            }
        }

        public Location StartLocation
        {
            get
            {
                if (Map != null) return Map.CurrentLocation;

                if (dummyLocations == null)
                {
                    CreateDummyLocations();
                }

                return dummyLocations[0];
            }
        }

        public Location EndLocation
        {
            get
            {
                if (Map != null) return Map.SelectedLocation;

                if (dummyLocations == null)
                {
                    CreateDummyLocations();
                }

                return dummyLocations[1];
            }
        }  
     
        public Submarine Submarine
        {
            get { return submarine; }
            set { submarine = value; }
        }

        public string SavePath
        {
            get { return savePath; }
            set { savePath = value; }
        }


        public GameSession(Submarine submarine, string savePath, GameModePreset gameModePreset, MissionType missionType = MissionType.None)
            : this(submarine, savePath)
        {
            CrewManager = new CrewManager(gameModePreset != null && gameModePreset.IsSinglePlayer);
            GameMode = gameModePreset.Instantiate(missionType);
        }

        public GameSession(Submarine submarine, string savePath, GameModePreset gameModePreset, MissionPrefab missionPrefab)
            : this(submarine, savePath)
        {
            CrewManager = new CrewManager(gameModePreset != null && gameModePreset.IsSinglePlayer);
            GameMode = gameModePreset.Instantiate(missionPrefab);
        }

        private GameSession(Submarine submarine, string savePath)
        {
            Submarine.MainSub = submarine;
            this.submarine = submarine;
            GameMain.GameSession = this;
            EventManager = new EventManager(this);
            this.savePath = savePath;
            
#if CLIENT
            int buttonHeight = (int)(HUDLayoutSettings.ButtonAreaTop.Height * 0.6f);
            infoButton = new GUIButton(HUDLayoutSettings.ToRectTransform(new Rectangle(HUDLayoutSettings.ButtonAreaTop.X, HUDLayoutSettings.ButtonAreaTop.Center.Y - buttonHeight / 2, 100, buttonHeight), GUICanvas.Instance),
                TextManager.Get("InfoButton"), textAlignment: Alignment.Center);
            infoButton.OnClicked = ToggleInfoFrame;
#endif
        }


        public GameSession(Submarine selectedSub, string saveFile, XDocument doc)
            : this(selectedSub, saveFile)
        {
            Submarine.MainSub = submarine;

            GameMain.GameSession = this;
            selectedSub.Name = doc.Root.GetAttributeString("submarine", selectedSub.Name);
            
            foreach (XElement subElement in doc.Root.Elements())
            {
                switch (subElement.Name.ToString().ToLowerInvariant())
                {
#if CLIENT
                    case "gamemode": //legacy support
                    case "singleplayercampaign":
                        CrewManager = new CrewManager(true);
                        GameMode = SinglePlayerCampaign.Load(subElement);
                        break;
#endif
                    case "multiplayercampaign":
                        CrewManager = new CrewManager(false);
                        GameMode = MultiPlayerCampaign.LoadNew(subElement);
                        break;
                }
            }
        }

        private void CreateDummyLocations()
        {
            dummyLocations = new Location[2];

            string seed = "";
            if (GameMain.GameSession != null && GameMain.GameSession.Level != null)
            {
                seed = GameMain.GameSession.Level.Seed;
            }
            else if (GameMain.NetLobbyScreen != null)
            {
                seed = GameMain.NetLobbyScreen.LevelSeed;
            }

            MTRandom rand = new MTRandom(ToolBox.StringToInt(seed));
            for (int i = 0; i < 2; i++)
            {
                dummyLocations[i] = Location.CreateRandom(new Vector2((float)rand.NextDouble() * 10000.0f, (float)rand.NextDouble() * 10000.0f), null);
            }
        }
        
        public void LoadPrevious()
        {
            Submarine.Unload();
            SaveUtil.LoadGame(savePath);
        }

        public void StartRound(string levelSeed, float? difficulty = null, bool loadSecondSub = false)
        {
            Level randomLevel = Level.CreateRandom(levelSeed, difficulty);

            StartRound(randomLevel, true, loadSecondSub);
        }

        public void StartRound(Level level, bool reloadSub = true, bool loadSecondSub = false, bool mirrorLevel = false)
        {
#if CLIENT
            GameMain.LightManager.LosEnabled = GameMain.NetworkMember == null || GameMain.NetworkMember.CharacterInfo != null;
            if (GameMain.Client == null) GameMain.LightManager.LosMode = GameMain.Config.LosMode;
#endif
            this.level = level;

            if (submarine == null)
            {
                DebugConsole.ThrowError("Couldn't start game session, submarine not selected");
                return;
            }

            if (reloadSub || Submarine.MainSub != submarine) submarine.Load(true);
            Submarine.MainSub = submarine;
            if (loadSecondSub)
            {
                if (Submarine.MainSubs[1] == null)
                {
                    Submarine.MainSubs[1] = new Submarine(Submarine.MainSub.FilePath, Submarine.MainSub.MD5Hash.Hash, true);
                    Submarine.MainSubs[1].Load(false);
                }
                else if (reloadSub)
                {
                    Submarine.MainSubs[1].Load(false);
                }
            }

            if (level != null)
            {
                level.Generate(mirrorLevel);
                if (level.StartOutpost != null)
                {
                    //start by placing the sub below the outpost
                    Rectangle outpostBorders = Level.Loaded.StartOutpost.GetDockedBorders();
                    Rectangle subBorders = submarine.GetDockedBorders();

                    Vector2 startOutpostSize = Vector2.Zero;
                    if (Level.Loaded.StartOutpost != null)
                    {
                        startOutpostSize = Level.Loaded.StartOutpost.Borders.Size.ToVector2();
                    }
                    submarine.SetPosition(
                        Level.Loaded.StartOutpost.WorldPosition -
                        new Vector2(0.0f, outpostBorders.Height / 2 + subBorders.Height / 2));

                    //find the port that's the nearest to the outpost and dock if one is found
                    float closestDistance = 0.0f;
                    DockingPort myPort = null, outPostPort = null;
                    foreach (DockingPort port in DockingPort.List)
                    {
                        if (port.IsHorizontal) { continue; }
                        if (port.Item.Submarine == level.StartOutpost)
                        {
                            outPostPort = port;
                            continue;
                        }
                        if (port.Item.Submarine != submarine) { continue; }

                        //the submarine port has to be at the top of the sub
                        if (port.Item.WorldPosition.Y < submarine.WorldPosition.Y) { continue; }

                        float dist = Vector2.DistanceSquared(port.Item.WorldPosition, level.StartOutpost.WorldPosition);
                        if (myPort == null || dist < closestDistance)
                        {
                            myPort = port;
                            closestDistance = dist;
                        }
                    }

                    if (myPort != null && outPostPort != null)
                    {
                        Vector2 portDiff = myPort.Item.WorldPosition - submarine.WorldPosition;
                        submarine.SetPosition((outPostPort.Item.WorldPosition - portDiff) - Vector2.UnitY * outPostPort.DockedDistance);
                        myPort.Dock(outPostPort);
                        myPort.Lock(true);
                    }
                }
                else
                {
                    submarine.SetPosition(submarine.FindSpawnPos(level.StartPosition));
                }
            }

            Entity.Spawner = new EntitySpawner();

            if (GameMode.Mission != null) currentMission = GameMode.Mission;
            if (GameMode != null) GameMode.Start();
            if (GameMode.Mission != null) Mission.Start(Level.Loaded);

            EventManager.StartRound(level);
            SteamAchievementManager.OnStartRound();

            if (GameMode != null)
            {
                GameMode.MsgBox();
                if (GameMode is MultiPlayerCampaign mpCampaign && GameMain.Server != null)
                {
                    mpCampaign.CargoManager.CreateItems();
                }
            }
            
            GameAnalyticsManager.AddDesignEvent("Submarine:" + submarine.Name);
            GameAnalyticsManager.AddDesignEvent("Level", ToolBox.StringToInt(level.Seed));
            GameAnalyticsManager.AddProgressionEvent(GameAnalyticsSDK.Net.EGAProgressionStatus.Start,
                    GameMode.Preset.Identifier, (Mission == null ? "None" : Mission.GetType().ToString()));
            
            
#if CLIENT
            if (GameMode is SinglePlayerCampaign) SteamAchievementManager.OnBiomeDiscovered(level.Biome);            
            roundSummary = new RoundSummary(this);

            GameMain.GameScreen.ColorFade(Color.Black, Color.TransparentBlack, 5.0f);

            if (!(GameMode is TutorialMode))
            {
                GUI.AddMessage("", Color.Transparent, 3.0f, playSound: false);   
                GUI.AddMessage(level.Biome.Name, Color.Lerp(Color.CadetBlue, Color.DarkRed, level.Difficulty / 100.0f), 5.0f, playSound: false);            
                GUI.AddMessage(TextManager.Get("Destination") + ": " + EndLocation.Name, Color.CadetBlue, playSound: false);
                GUI.AddMessage(TextManager.Get("Mission") + ": " + (Mission == null ? TextManager.Get("None") : Mission.Name), Color.CadetBlue, playSound: false);
            }
#endif

            RoundStartTime = Timing.TotalTime;
        }

        public void Update(float deltaTime)
        {
            EventManager.Update(deltaTime);
            GameMode?.Update(deltaTime);
            Mission?.Update(deltaTime);

            UpdateProjSpecific(deltaTime);
        }

        partial void UpdateProjSpecific(float deltaTime);

        public void EndRound(string endMessage)
        {
            if (Mission != null) Mission.End();
            GameAnalyticsManager.AddProgressionEvent(
                (Mission == null || Mission.Completed)  ? GameAnalyticsSDK.Net.EGAProgressionStatus.Complete : GameAnalyticsSDK.Net.EGAProgressionStatus.Fail,
                GameMode.Preset.Identifier, 
                (Mission == null ? "None" : Mission.GetType().ToString()));            

#if CLIENT
            if (roundSummary != null)
            {
                GUIFrame summaryFrame = roundSummary.CreateSummaryFrame(endMessage);
                GUIMessageBox.MessageBoxes.Add(summaryFrame);
                var okButton = new GUIButton(new RectTransform(new Vector2(0.2f, 1.0f), summaryFrame.Children.First().Children.First().FindChild("buttonarea").RectTransform),
                    TextManager.Get("OK"))
                {
                    OnClicked = (GUIButton button, object obj) => { GUIMessageBox.MessageBoxes.Remove(summaryFrame); return true; }
                };
            }
#endif

            EventManager.EndRound();
            SteamAchievementManager.OnRoundEnded(this);

            currentMission = null;

            StatusEffect.StopAll();
        }
        
        public void KillCharacter(Character character)
        {
#if CLIENT
            CrewManager.KillCharacter(character);
#endif
        }

        public void ReviveCharacter(Character character)
        {
#if CLIENT
            CrewManager.ReviveCharacter(character);
#endif
        }

        public void Save(string filePath)
        {
            if (!(GameMode is CampaignMode))
            {
                throw new NotSupportedException("GameSessions can only be saved when playing in a campaign mode.");
            }

            XDocument doc = new XDocument(
                new XElement("Gamesession"));

            var now = DateTime.Now;
            doc.Root.Add(new XAttribute("savetime", now.ToShortTimeString() + ", " + now.ToShortDateString()));
            doc.Root.Add(new XAttribute("submarine", submarine == null ? "" : submarine.Name));
            doc.Root.Add(new XAttribute("mapseed", Map.Seed));

            ((CampaignMode)GameMode).Save(doc.Root);

            try
            {
                doc.Save(filePath);
            }
            catch (Exception e)
            {
                DebugConsole.ThrowError("Saving gamesession to \"" + filePath + "\" failed!", e);
            }
        }

        public void Load(XElement saveElement)
        {
            foreach (XElement subElement in saveElement.Elements())
            {
                switch (subElement.Name.ToString().ToLowerInvariant())
                {
#if CLIENT
                    case "gamemode": //legacy support
                    case "singleplayercampaign":
                        GameMode = SinglePlayerCampaign.Load(subElement);
                        break;
#endif
                    case "multiplayercampaign":
                        MultiPlayerCampaign mpCampaign = GameMode as MultiPlayerCampaign;
                        if (mpCampaign == null)
                        {
                            DebugConsole.ThrowError("Error while loading a save file: the save file is for a multiplayer campaign but the current gamemode is "+GameMode.GetType().ToString());
                            break;
                        }

                        mpCampaign.Load(subElement);
                        break;
                }
            }
        }

    }
}