// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.

using Framework.GameMath;
using System.IO;
using System.Numerics;

namespace Game.DataStorage
{
    public struct M2SplineKey
    {
        public M2SplineKey(BinaryReader reader)
        {
            p0 = new Vector3(reader.ReadSingle(), reader.ReadSingle(), reader.ReadSingle());
            p1 = new Vector3(reader.ReadSingle(), reader.ReadSingle(), reader.ReadSingle());
            p2 = new Vector3(reader.ReadSingle(), reader.ReadSingle(), reader.ReadSingle());
        }

        public Vector3 p0;
        public Vector3 p1;
        public Vector3 p2;
    }

    public struct M2Header
    {
        public uint Magic;               // "MD20"
        public uint Version;                // The version of the format.
        public uint lName;                  // Length of the model's name including the trailing \0
        public uint ofsName;                // Offset to the name, it seems like models can get reloaded by this name.should be unique, i guess.
        public uint GlobalModelFlags;       // 0x0001: tilt x, 0x0002: tilt y, 0x0008: add 2 fields in header, 0x0020: load .phys data (MoP+), 0x0080: has _lod .skin files (MoP?+), 0x0100: is camera related.
        public uint nGlobalSequences;
        public uint ofsGlobalSequences;     // A list of timestamps.
        public uint nAnimations;
        public uint ofsAnimations;          // Information about the animations in the model.
        public uint nAnimationLookup;
        public uint ofsAnimationLookup;     // Mapping of global IDs to the entries in the Animation sequences block.
        public uint nBones;                 // MAX_BONES = 0x100
        public uint ofsBones;               // Information about the bones in this model.
        public uint nKeyBoneLookup;
        public uint ofsKeyBoneLookup;       // Lookup table for key skeletal bones.
        public uint nVertices;
        public uint ofsVertices;            // Vertices of the model.
        public uint nViews;                 // Views (LOD) are now in .skins.
        public uint nSubmeshAnimations;
        public uint ofsSubmeshAnimations;   // Submesh color and alpha animations definitions.
        public uint nTextures;
        public uint ofsTextures;            // Textures of this model.
        public uint nTransparency;
        public uint ofsTransparency;        // Transparency of textures.
        public uint nUVAnimation;
        public uint ofsUVAnimation;
        public uint nTexReplace;
        public uint ofsTexReplace;          // Replaceable Textures.
        public uint nRenderFlags;
        public uint ofsRenderFlags;         // Blending modes / render flags.
        public uint nBoneLookupTable;
        public uint ofsBoneLookupTable;     // A bone lookup table.
        public uint nTexLookup;
        public uint ofsTexLookup;           // The same for textures.
        public uint nTexUnits;              // possibly removed with cata?!
        public uint ofsTexUnits;            // And texture units. Somewhere they have to be too.
        public uint nTransLookup;
        public uint ofsTransLookup;         // Everything needs its lookup. Here are the transparencies.
        public uint nUVAnimLookup;
        public uint ofsUVAnimLookup;
        public AxisAlignedBox BoundingBox;            // min/max( [1].z, 2.0277779f ) - 0.16f seems to be the maximum camera height
        public float BoundingSphereRadius;
        public AxisAlignedBox CollisionBox;
        public float CollisionSphereRadius;
        public uint nBoundingTriangles;
        public uint ofsBoundingTriangles;   // Our bounding volumes. Similar structure like in the old ofsViews.
        public uint nBoundingVertices;
        public uint ofsBoundingVertices;
        public uint nBoundingNormals;
        public uint ofsBoundingNormals;
        public uint nAttachments;
        public uint ofsAttachments;         // Attachments are for weapons etc.
        public uint nAttachLookup;
        public uint ofsAttachLookup;        // Of course with a lookup.
        public uint nEvents;
        public uint ofsEvents;              // Used for playing sounds when dying and a lot else.
        public uint nLights;
        public uint ofsLights;              // Lights are mainly used in loginscreens but in wands and some doodads too.
        public uint nCameras;               // Format of Cameras changed with version 271!
        public uint ofsCameras;             // The cameras are present in most models for having a model in the Character-Tab.
        public uint nCameraLookup;
        public uint ofsCameraLookup;        // And lookup-time again.
        public uint nRibbonEmitters;
        public uint ofsRibbonEmitters;      // Things swirling around. See the CoT-entrance for light-trails.
        public uint nParticleEmitters;
        public uint ofsParticleEmitters;    // Spells and weapons, doodads and loginscreens use them. Blood dripping of a blade? Particles.
        public uint nBlendMaps;             // This has to deal with blending. Exists IFF (flags & 0x8) != 0. When set, textures blending is overriden by the associated array. See M2/WotLK#Blend_mode_overrides
        public uint ofsBlendMaps;           // Same as above. Points to an array of uint16 of nBlendMaps entries -- From WoD information.};
    }

    public struct M2Array
    {
        public uint number;
        public uint offset_elements;
    }

    public struct M2Track
    {
        public ushort interpolation_type;
        public ushort global_sequence;
        public M2Array timestamps;
        public M2Array values;
    }

    public struct M2Camera
    {
        public uint type; // 0: portrait, 1: characterinfo; -1: else (flyby etc.); referenced backwards in the lookup table.
        public float far_clip;
        public float near_clip;
        public M2Track positions; // How the camera's position moves. Should be 3*3 floats.
        public Vector3 position_base;
        public M2Track target_positions; // How the target moves. Should be 3*3 floats.
        public Vector3 target_position_base;
        public M2Track rolldata; // The camera can have some roll-effect. Its 0 to 2*Pi.
        public M2Track fovdata;  // FoV for this segment
    }
}