using Barotrauma.Extensions;
using Microsoft.Xna.Framework;
using System;
using System.Linq;
using System.Collections.Generic;
using System.Xml.Linq;
using Barotrauma.IO;
using System.Collections.Immutable;
using System.ComponentModel;
#if CLIENT
using Microsoft.Xna.Framework.Graphics;
#endif

namespace Barotrauma
{
    partial class StructurePrefab : MapEntityPrefab
    {
        public static readonly PrefabCollection<StructurePrefab> Prefabs = new PrefabCollection<StructurePrefab>();

        public override LocalizedString Name { get; }

        public readonly ContentXElement ConfigElement;

        public override bool CanSpriteFlipX { get; }
        public override bool CanSpriteFlipY { get; }

        /// <summary>
        /// If null, the orientation is determined automatically based on the dimensions of the structure instances
        /// </summary>
        public readonly bool? IsHorizontal;

        public Vector2 ScaledSize => Size * Scale;

        public readonly Sprite BackgroundSprite;

        public override Sprite Sprite { get; }

        public override string OriginalName { get; }

        public override ImmutableHashSet<Identifier> Tags { get; }

        public override ImmutableHashSet<Identifier> AllowedLinks { get; } 

        public override MapEntityCategory Category { get; }

        public override ImmutableHashSet<string> Aliases { get; }

        [Serialize(false, IsPropertySaveable.No, description: "Does the structure have a physics body?")]
        public bool Body { get; private set; }

        [Serialize(0.0f, IsPropertySaveable.No, description: "Rotation of the physics body in degrees.")]
        public float BodyRotation { get; private set; }
        
        [Serialize(0.0f, IsPropertySaveable.No, description: "Width of the physics body in pixels.")]
        public float BodyWidth { get; private set; }

        [Serialize(0.0f, IsPropertySaveable.No, description: "Height of the physics body in pixels.")]
        public float BodyHeight { get; private set; }

        //in display units
        [Serialize("0.0,0.0", IsPropertySaveable.No, description: "Offset of the physics body from the center of the structure in pixels.")]
        public Vector2 BodyOffset { get; private set; }

        [Serialize(false, IsPropertySaveable.No, description: "Is the structure a platform (i.e. a \"floor\" the players can pass through)? Only relevant if the structure has a physics body.")]
        public bool Platform { get; private set; }

        [Serialize(false, IsPropertySaveable.No, description: "Can items like signal components be attached on this structure? Should be enabled on structures like decorative background walls.")]
        public bool AllowAttachItems { get; private set; }

        [Serialize(true, IsPropertySaveable.No, description: "Can the structure be rotated in the submarine editor?")]
        public bool AllowRotatingInEditor { get; set; }

        [Serialize(0.0f, IsPropertySaveable.No)]
        public float MinHealth { get; private set; }

        private float health;
        [Serialize(100.0f, IsPropertySaveable.No)]
        public float Health
        {
            get { return health; }
            private set { health = Math.Max(value, MinHealth); }
        }

        [Serialize(true, IsPropertySaveable.No, description: "Should the structure be indestructible when used in an outpost?")]
        public bool IndestructibleInOutposts { get; private set; }

        [Serialize(false, IsPropertySaveable.No, description: "Should the structure cast shadows and obstruct visibility when LOS is enabled?")]
        public bool CastShadow { get; private set; }

        [Serialize(Direction.None, IsPropertySaveable.No, description: "Makes the structure function as a staircase.")]
        public Direction StairDirection { get; private set; }

        [Serialize(45.0f, IsPropertySaveable.No, description: "Angle of the stairs in degrees. Only relevant if StairDirection is something else than None.")]
        public float StairAngle { get; private set; }

        [Serialize(false, IsPropertySaveable.No, description: "If enabled, monsters will not be able to target this structure.")]
        public bool NoAITarget { get; private set; }

        [Serialize("0,0", IsPropertySaveable.Yes, description: "Size of the structure in pixels. If not set, the size is determined, based on the attributes width and height, and if those aren't defined either, based on the size of the structure's sprite.")]
        public Vector2 Size { get; private set; }

        [Serialize("", IsPropertySaveable.Yes, description: "Tag of the sound that plays when something damages the wall.")]
        public string DamageSound { get; private set; }

        [Serialize("shrapnel", IsPropertySaveable.Yes, description: "Identifier of the particles emitted when something damages the wall.")]
        public string DamageParticle { get; private set; }

        protected Vector2 textureScale = Vector2.One;
        [Editable(DecimalCount = 3), Serialize("1.0, 1.0", IsPropertySaveable.Yes)]
        public Vector2 TextureScale
        {
            get { return textureScale; }
            private set
            {
                textureScale = new Vector2(
                    MathHelper.Clamp(value.X, 0.01f, 10),
                    MathHelper.Clamp(value.Y, 0.01f, 10));
            }
        }

        protected override Identifier DetermineIdentifier(XElement element)
        {
            Identifier identifier = base.DetermineIdentifier(element);
            string originalName = element.GetAttributeString("name", "");
            if (identifier.IsEmpty && !string.IsNullOrEmpty(originalName))
            {
                string categoryStr = element.GetAttributeString("category", "Misc");
                if (Enum.TryParse(categoryStr, true, out MapEntityCategory category) && category.HasFlag(MapEntityCategory.Legacy))
                {
                    identifier = $"legacystructure_{originalName.Replace(" ", "")}".ToIdentifier();
                }
            }
            return identifier;
        }

        public StructurePrefab(ContentXElement element, StructureFile file) : base(element, file)
        {
            OriginalName = element.GetAttributeString("name", "");
            ConfigElement = element;

            var parentType = element.Parent?.GetAttributeIdentifier("prefabtype", Identifier.Empty) ?? Identifier.Empty;

            Identifier nameIdentifier = element.GetAttributeIdentifier("nameidentifier", "");

            //only used if the item doesn't have a name/description defined in the currently selected language
            Identifier fallbackNameIdentifier = element.GetAttributeIdentifier("fallbacknameidentifier", "");

            Name = TextManager.Get(nameIdentifier.IsEmpty
                    ? $"EntityName.{Identifier}"
                    : $"EntityName.{nameIdentifier}",
                $"EntityName.{fallbackNameIdentifier}");

            if (parentType == "wrecked")
            {
                Name = TextManager.GetWithVariable("wreckeditemformat", "[name]", Name);
            }
            if (!string.IsNullOrEmpty(OriginalName))
            {
                Name = Name.Fallback(OriginalName);
            }

            var tags = new HashSet<Identifier>();
            string joinedTags = element.GetAttributeString("tags", "");
            if (string.IsNullOrEmpty(joinedTags)) joinedTags = element.GetAttributeString("Tags", "");
            foreach (string tag in joinedTags.Split(','))
            {
                tags.Add(tag.Trim().ToIdentifier());
            }

            if (element.GetAttribute("ishorizontal") != null)
            {
                IsHorizontal = element.GetAttributeBool("ishorizontal", false);
            }

#if CLIENT
            var decorativeSprites = new List<DecorativeSprite>();
            var decorativeSpriteGroups = new Dictionary<int, List<DecorativeSprite>>();
#endif
            foreach (var subElement in element.Elements())
            {
                switch (subElement.Name.ToString().ToLowerInvariant())
                {
                    case "sprite":
                        Sprite = new Sprite(subElement, lazyLoad: true);
                        if (subElement.GetAttribute("sourcerect") == null &&
                            subElement.GetAttribute("sheetindex") == null)
                        {
                            DebugConsole.ThrowErrorLocalized("Warning - sprite sourcerect not configured for structure \"" + Name + "\"!");
                        }
#if CLIENT
                        if (subElement.GetAttributeBool("fliphorizontal", false))
                            Sprite.effects = SpriteEffects.FlipHorizontally;
                        if (subElement.GetAttributeBool("flipvertical", false))
                            Sprite.effects = SpriteEffects.FlipVertically;
#endif
                        CanSpriteFlipX = subElement.GetAttributeBool("canflipx", true);
                        CanSpriteFlipY = subElement.GetAttributeBool("canflipy", true);

                        if (subElement.GetAttribute("name") == null && !Name.IsNullOrWhiteSpace())
                        {
                            Sprite.Name = Name.Value;
                        }
                        Sprite.EntityIdentifier = Identifier;
                        break;
                    case "backgroundsprite":
                        BackgroundSprite = new Sprite(subElement, lazyLoad: true);
                        if (subElement.GetAttribute("sourcerect") == null && Sprite != null)
                        {
                            BackgroundSprite.SourceRect = Sprite.SourceRect;
                            BackgroundSprite.size = Sprite.size;
                            BackgroundSprite.size.X *= Sprite.SourceRect.Width;
                            BackgroundSprite.size.Y *= Sprite.SourceRect.Height;
                            BackgroundSprite.RelativeOrigin = subElement.GetAttributeVector2("origin", new Vector2(0.5f, 0.5f));
                        }
#if CLIENT
                        if (subElement.GetAttributeBool("fliphorizontal", false)) { BackgroundSprite.effects = SpriteEffects.FlipHorizontally; }
                        if (subElement.GetAttributeBool("flipvertical", false)) { BackgroundSprite.effects = SpriteEffects.FlipVertically; }
                        BackgroundSpriteColor = subElement.GetAttributeColor("color", Color.White);
#endif
                        break;
                    case "decorativesprite":
#if CLIENT
                        string decorativeSpriteFolder = "";
                        if (subElement.DoesAttributeReferenceFileNameAlone("texture"))
                        {
                            decorativeSpriteFolder = Path.GetDirectoryName(file.Path);
                        }

                        int groupID = 0;
                        DecorativeSprite decorativeSprite = null;
                        if (subElement.GetAttribute("texture") == null)
                        {
                            groupID = subElement.GetAttributeInt("randomgroupid", 0);
                        }
                        else
                        {
                            decorativeSprite = new DecorativeSprite(subElement, decorativeSpriteFolder, lazyLoad: true);
                            decorativeSprites.Add(decorativeSprite);
                            groupID = decorativeSprite.RandomGroupID;
                        }
                        if (!decorativeSpriteGroups.ContainsKey(groupID))
                        {
                            decorativeSpriteGroups.Add(groupID, new List<DecorativeSprite>());
                        }
                        decorativeSpriteGroups[groupID].Add(decorativeSprite);
#endif
                        break;
                }
            }
#if CLIENT
            DecorativeSprites = decorativeSprites.ToImmutableArray();
            DecorativeSpriteGroups = decorativeSpriteGroups.Select(kvp => (kvp.Key, kvp.Value.ToImmutableArray())).ToImmutableDictionary();
#endif

            string categoryStr = element.GetAttributeString("category", "Structure");
            if (!Enum.TryParse(categoryStr, true, out MapEntityCategory category))
            {
                category = MapEntityCategory.Structure;
            }
            Category = category;

            Aliases =
                (element.GetAttributeStringArray("aliases", null, convertToLowerInvariant: true) ??
                element.GetAttributeStringArray("Aliases", Array.Empty<string>(), convertToLowerInvariant: true)).ToImmutableHashSet();

            string nonTranslatedName = element.GetAttributeString("name", null) ?? element.Name.ToString();
            Aliases.Add(nonTranslatedName.ToLowerInvariant());

            SerializableProperty.DeserializeProperties(this, element);
            if (Body)
            {
                tags.Add("wall".ToIdentifier());
            }

            LoadDescription(element);

            //backwards compatibility
            if (element.GetAttribute("size") == null)
            {
                Size = Vector2.Zero;
                if (element.GetAttribute("width") == null && element.GetAttribute("height") == null)
                {
                    Size = Sprite.SourceRect.Size.ToVector2();
                }
                else
                {
                    Size = new Vector2(
                        element.GetAttributeFloat("width", 0.0f),
                        element.GetAttributeFloat("height", 0.0f));
                }
            }

            //backwards compatibility
            if (categoryStr.Equals("Thalamus", StringComparison.OrdinalIgnoreCase))
            {
                Category = MapEntityCategory.Wrecked;
                Subcategory = "Thalamus";
            }

            if (Identifier == Identifier.Empty)
            {
                DebugConsole.ThrowError(
                    "Structure prefab \"" + Name.Value + "\" has no identifier. All structure prefabs have a unique identifier string that's used to differentiate between items during saving and loading.",
                    contentPackage: ContentPackage);
            }
#if DEBUG
            if (!Category.HasFlag(MapEntityCategory.Legacy) && !HideInMenus)
            {
                if (!string.IsNullOrEmpty(OriginalName))
                {
                    DebugConsole.AddWarning($"Structure \"{(Identifier == Identifier.Empty ? Name : Identifier.Value)}\" has a hard-coded name, and won't be localized to other languages.",
                        ContentPackage);
                }
            }
#endif

            Tags = tags.ToImmutableHashSet();
            AllowedLinks = ImmutableHashSet<Identifier>.Empty;
        }

        protected override void CreateInstance(Rectangle rect)
        {
            throw new NotImplementedException();
        }

        public override void Dispose() { }
    }
}