/*******************************************************************************************
*
*   raylib [models] example - yaw pitch roll
*
*   Example complexity rating: [★★☆☆] 2/4
*
*   Example originally created with raylib 1.8, last time updated with raylib 4.0
*
*   Example contributed by Berni (@Berni8k) and reviewed by Ramon Santamaria (@raysan5)
*
*   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) 2017-2025 Berni (@Berni8k) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using static Raylib_cs.Raymath;

namespace Examples.Models;

public partial class YawPitchRoll : IExample
{
    private const int screenWidth = 800;
    private const int screenHeight = 450;

    public string Name => "Models / Yaw Pitch Roll";

    public string Title => "raylib [models] example - yaw pitch roll";

    private Camera3D camera;

    private Model model;
    private Texture2D texture;

    private float pitch;
    private float roll;
    private float yaw;

    public unsafe void Init()
    {
        camera = new();
        camera.Position = new Vector3(0.0f, 50.0f, -120.0f);// Camera position perspective
        camera.Target = new Vector3(0.0f, 0.0f, 0.0f);      // Camera looking at point
        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);          // Camera up vector (rotation towards target)
        camera.FovY = 30.0f;                                // Camera field-of-view Y
        camera.Projection = CameraProjection.Perspective;   // Camera type

        model = LoadModel("resources/models/obj/plane.obj");                 // Load model
        texture = LoadTexture("resources/models/obj/plane_diffuse.png");     // Load model texture

        SetTextureWrap(texture, TextureWrap.Repeat);        // Force Repeat to avoid issue on Web version

        model.Materials[0].Maps[(int)MaterialMapIndex.Diffuse].Texture = texture;   // Set map diffuse texture

        pitch = 0.0f;
        roll = 0.0f;
        yaw = 0.0f;
    }

    public void Update()
    {
        // Update
        //----------------------------------------------------------------------------------

        // Plane pitch (x-axis) controls
        if (IsKeyDown(KeyboardKey.Down))
        {
            pitch += 0.6f;
        }
        else if (IsKeyDown(KeyboardKey.Up))
        {
            pitch -= 0.6f;
        }
        else
        {
            if (pitch > 0.3f)
            {
                pitch -= 0.3f;
            }
            else if (pitch < -0.3f)
            {
                pitch += 0.3f;
            }
        }

        // Plane yaw (y-axis) controls
        if (IsKeyDown(KeyboardKey.S))
        {
            yaw += 1.0f;
        }
        else if (IsKeyDown(KeyboardKey.A))
        {
            yaw -= 1.0f;
        }
        else
        {
            if (yaw > 0.0f)
            {
                yaw -= 0.5f;
            }
            else if (yaw < 0.0f)
            {
                yaw += 0.5f;
            }
        }

        // Plane roll (z-axis) controls
        if (IsKeyDown(KeyboardKey.Left))
        {
            roll += 1.0f;
        }
        else if (IsKeyDown(KeyboardKey.Right))
        {
            roll -= 1.0f;
        }
        else
        {
            if (roll > 0.0f)
            {
                roll -= 0.5f;
            }
            else if (roll < 0.0f)
            {
                roll += 0.5f;
            }
        }

        // Tranformation matrix for rotations
        model.Transform = MatrixRotateXYZ(new Vector3(DEG2RAD * pitch, DEG2RAD * yaw, DEG2RAD * roll));
        //----------------------------------------------------------------------------------

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

        // Draw 3D model (recomended to draw 3D always before 2D)
        BeginMode3D(camera);

        // Draw 3d model with texture
        DrawModel(model, new Vector3(0.0f, -8.0f, 0.0f), 1.0f, Color.White);
        DrawGrid(10, 10.0f);

        EndMode3D();

        // Draw controls info
        DrawRectangle(30, 370, 260, 70, Fade(Color.Green, 0.5f));
        DrawRectangleLines(30, 370, 260, 70, Fade(Color.DarkGreen, 0.5f));
        DrawText("Pitch controlled with: KEY_UP / KEY_DOWN", 40, 380, 10, Color.DarkGray);
        DrawText("Roll controlled with: KEY_LEFT / KEY_RIGHT", 40, 400, 10, Color.DarkGray);
        DrawText("Yaw controlled with: KEY_A / KEY_S", 40, 420, 10, Color.DarkGray);

        DrawText(
            "(c) WWI Plane Model created by GiaHanLam",
            screenWidth - 240,
            screenHeight - 20,
            10,
            Color.DarkGray
        );

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

    public void Unload()
    {
        UnloadModel(model);
    }

    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        InitWindow(screenWidth, screenHeight, "raylib [models] example - yaw pitch roll");

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

        var game = new YawPitchRoll();
        game.Init();

        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            game.Update();
        }

        game.Unload();

        // De-Initialization
        //--------------------------------------------------------------------------------------
        CloseWindow();        // Close window and OpenGL context
        //--------------------------------------------------------------------------------------

        return 0;
    }
}