/*******************************************************************************************
*
*   raylib [models] example - loading iqm
*
*   Example complexity rating: [★★☆☆] 2/4
*
*   Example originally created with raylib 2.5, last time updated with raylib 3.5
*
*   Example contributed by Culacant (@culacant) and reviewed by Ramon Santamaria (@raysan5)
*
*   NOTES: To export an IQM model from blender, make sure it is not posed, the vertices need
*   to be in the same position as they would be in edit mode and the scale of the models is
*   set to 0; scaling can be set from the export menu
*
*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
*   BSD-like license that allows static linking with closed source software
*
*   Copyright (c) 2019-2025 Culacant (@culacant) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using System.Numerics;
using System.Runtime.InteropServices;
using static Raylib_cs.Raylib;

namespace Examples.Models;

public class LoadingIqm
{
    public unsafe static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        const int screenWidth = 800;
        const int screenHeight = 450;

        InitWindow(screenWidth, screenHeight, "raylib [models] example - model animation");

        // Define the camera to look into our 3d world
        Camera3D camera = new();
        camera.Position = new Vector3(10.0f, 10.0f, 10.0f);
        camera.Target = new Vector3(0.0f, 4.0f, 0.0f);
        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
        camera.FovY = 45.0f;
        camera.Projection = CameraProjection.Perspective;

        Model model = LoadModel("resources/models/iqm/guy.iqm");
        Texture2D texture = LoadTexture("resources/models/iqm/guytex.png");
        Raylib.SetMaterialTexture(ref model, 0, MaterialMapIndex.Diffuse, ref texture);
        Vector3 position = new(0.0f, 0.0f, 0.0f);

        // Load animation data
        var anims = LoadModelAnimations("resources/models/iqm/guyanim.iqm");

        // Animation playing variables
        int animIndex = 0;
        float animCurrentFrame = 0.0f;

        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------

        // Main game loop
        while (!WindowShouldClose())
        {
            // Update
            //----------------------------------------------------------------------------------
            UpdateCamera(ref camera, CameraMode.Orbital);

            // Play animation when spacebar is held down
            animCurrentFrame += 1.0f;
            UpdateModelAnimation(model, anims[0], animCurrentFrame);

            if (animCurrentFrame >= anims[0].KeyFrameCount)
            {
                animCurrentFrame = 0;
            }
            //----------------------------------------------------------------------------------

            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
            ClearBackground(Color.RayWhite);

            BeginMode3D(camera);

            DrawModelEx(
                model,
                position,
                new Vector3(1.0f, 0.0f, 0.0f),
                -90.0f,
                new Vector3(1.0f, 1.0f, 1.0f),
                Color.White
            );

            DrawGrid(10, 1.0f);

            EndMode3D();
            DrawText($"Current animation: {anims[animIndex].NameToString()}", 10, 10, 20, Color.Maroon);
            DrawText("(c) Guy IQM 3D model by @culacant", screenWidth - 200, screenHeight - 20, 10, Color.Gray);

            EndDrawing();
            //----------------------------------------------------------------------------------
        }

        // De-Initialization
        //--------------------------------------------------------------------------------------
        UnloadTexture(texture);
        UnloadModelAnimations(anims);
        UnloadModel(model);

        CloseWindow();
        //--------------------------------------------------------------------------------------

        return 0;
    }
}