// NOTE(Constantine):
// Reconstructing 3D point from 2D UV coordinates of a 3D triangle using barycentric coordinates in Game Script C
// https://discord.gg/D7pKPw4kFf
// https://discord.com/channels/908452801678561291/908452802165112885/1410190619644788797

#include "gamescriptc.h"
#include <stdio.h> // For printf
#include <math.h>  // for sqrt

typedef struct {
  float x, y, z;
} Vec3;

typedef struct {
  float u, v;
} UV;

Vec3 reconstruct3DPosition(Vec3 v1, Vec3 v2, Vec3 v3, UV uv) {
  float w = 1.0f - uv.u - uv.v;

  Vec3 point;
  point.x = w * v1.x + uv.u * v2.x + uv.v * v3.x;
  point.y = w * v1.y + uv.u * v2.y + uv.v * v3.y;
  point.z = w * v1.z + uv.u * v2.z + uv.v * v3.z;

  return point;
}

cfn frame() {
  framestart();

  UV uv = {0.0f, 0.0f};

  if (getCurrentFrame() == 0) {
    Number inputU = globalArrayPersistentNew8Bit("inputU", 16);
    Number inputV = globalArrayPersistentNew8Bit("inputV", 16);
    pointerSetString(inputU, 0, "0.2");
    pointerSetString(inputV, 0, "0.3");
  }
  imguiBegin();
  if (imguiWindowBegin("UV coordinates", 1, 0) == true) {
    Number inputU = globalArrayPersistentNew8Bit("inputU", 16);
    Number inputV = globalArrayPersistentNew8Bit("inputV", 16);
    imguiInputText("U", inputU, 0, 16);
    imguiInputText("V", inputV, 0, 16);
    String stringU = pointerGetString(inputU);
    String stringV = pointerGetString(inputV);
    uv.u = interpretStringToFloat(stringU);
    uv.v = interpretStringToFloat(stringV);
  }
  imguiWindowEnd();
  imguiEnd();

  Vec3 v1 = {1.0f, 0.0f, 0.0f};
  Vec3 v2 = {0.0f, 0.0f, 1.0f};
  Vec3 v3 = {0.0f, 1.0f, 0.0f};

  if (getCurrentFrame() == 0) {
    gizmoSetVector("v1", v1.x, v1.y, v1.z);
    gizmoSetVector("v2", v2.x, v2.y, v2.z);
    gizmoSetVector("v3", v3.x, v3.y, v3.z);
  }

  NumberArray gv1 = gizmoGetVector("v1");
  NumberArray gv2 = gizmoGetVector("v2");
  NumberArray gv3 = gizmoGetVector("v3");

  v1.x = gv1[0];
  v1.y = gv1[1];
  v1.z = gv1[2];

  v2.x = gv2[0];
  v2.y = gv2[1];
  v2.z = gv2[2];

  v3.x = gv3[0];
  v3.y = gv3[1];
  v3.z = gv3[2];

  Vec3 reconstructedPoint = reconstruct3DPosition(v1, v2, v3, uv);

  printf("Reconstructed 3D Position: (%f, %f, %f)\n", reconstructedPoint.x, reconstructedPoint.y, reconstructedPoint.z);

  drawTriangle("", v1.x,v1.y,v1.z, v2.x,v2.y,v2.z, v3.x,v3.y,v3.z, 255,45,85,255);
  drawPoint("", reconstructedPoint.x, reconstructedPoint.y, reconstructedPoint.z, 0.5f, 255,0,255,255);

  // Gizmo
  Number currentMode = globalArrayPersistentNew8Bit("gizmoCurrentMode", 1 * 4);
  {
    if (pointerGetUnsignedInteger(currentMode, 0) == 0) {
        // https://discord.gg/D7pKPw4kFf, https://discord.com/channels/908452801678561291/908452802165112885/918489067543466054
        if (windowIsFocused() && windowIsHovered()) {
            defaultCameraDefaultControlEnable();
        } else {
            defaultCameraDefaultControlDisable();
        }
    } else {
        defaultCameraDefaultControlDisable();
    }
    if (keyboardGetGlfwKeyEvent(258) == 0 && mouseGetButtonIsPressed(2)) { // Change current modelling mode: right mouse button
        Number v = pointerGetUnsignedInteger(currentMode, 0);
        v = v == 0 ? 1 : 0;
        pointerSetUnsignedInteger(currentMode, 0, v);
        gizmoSetMode("v1", v);
        gizmoSetMode("v2", v);
        gizmoSetMode("v3", v);
    }
  }
}