#include "ogro.h"
#include "rocket.h"

void COgroEnemy::OnCollision(CObject *collisionObject)
{
	// 只有模型沒有死亡，才有可能與其它對象碰撞
	if (modelState != MODEL_DIE)
	{
		// 如果敵人與另外的敵人碰撞
		if ((typeid(*collisionObject) == typeid(CSodEnemy)) ||
			(typeid(*collisionObject) == typeid(COgroEnemy)))
		{
			aiState = AI_UNCARING;
		}
		// 如果敵人于地面碰撞
		else if (typeid(*collisionObject) == typeid(CTerrain))
		{
			position.y = ((CTerrain*)collisionObject)->GetHeight(position.x, position.z) + size;
	
			if (position.x <= ((CTerrain*)collisionObject)->GetScanDepth())
				position.x = ((CTerrain*)collisionObject)->GetScanDepth();
			if (position.x >= ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth())
				position.x = ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth();
			if (position.z <= ((CTerrain*)collisionObject)->GetScanDepth())
				position.z = ((CTerrain*)collisionObject)->GetScanDepth();
			if (position.z >= ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth())
				position.z = ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth();
		}
		else if (typeid(*collisionObject) == typeid(CRocket))
		{
			// 殺死ogre
			aiState = AI_DEAD;
			velocity = CVector(0.0, 0.0, 0.0);
		}
	}
}

void COgroEnemy::OnPrepare() 
{
     float dirToPlayer;  // 敵人與游戲者的角度方向

     CVector diff;       // 從敵人到游戲者的方向矢量
     diff.x = position.x - player->position.x;
     diff.z = position.z - player->position.z;
     diff.Normalize();
     // 在場景中計算從敵人到游戲者的方向矢量與z軸負方向的夾角
     dirToPlayer = RAD2DEG(diff.Angle(CVector(0,0,-1)));
     // 產生隨機數種子
     srand((unsigned int)time(NULL));

     ProcessAI();
     // 根據AIstate設置模型狀態
     switch (aiState)
     {
     case AI_SCARED:
          direction = (dirToPlayer - 90) + ((rand()%90)-45);  // 設置敵人的方向
                                                              // -90 - 90 
          modelState = MODEL_RUN;
          velocity = CVector(0.0, 0.0, 15.0);
          break;
     case AI_UNCARING:
          direction = float(rand() % 360);
          if ((rand() % 4) != 0)
          {
               modelState = MODEL_IDLE;
               velocity = CVector(0.0, 0.0, 0.0);
          }
          else
          {
               velocity = CVector(0.0, 0.0, 15.0);
               modelState = MODEL_RUN;
          }
          break;
     case AI_DEAD:
          modelState = MODEL_DIE;
          velocity = CVector(0.0, 0.0, 0.0);
          if (nextFrame == stateStart)
          {
               // 殺死魔鬼
               isDead = true;
          }
          break;
     default:
          break;
     }
     // 準備MD2模型
     CEntity::OnPrepare();
}

void COgroEnemy::Load()
{
	// 裝人三維模型
	CMD2Model::Load("models\\ogro\\tris.md2", "models\\ogro\\ogrobase.pcx");
}

void COgroEnemy::OnProcessAI()
{
     // 計算與游戲者之間的距離
     CVector diff = player->position - position;

     if (aiState != AI_DEAD)
     {
          // 如果與游戲者距離非常近，敵人的狀態會很恐怖
          distFromPlayer = sqrt(diff.x*diff.x + diff.y*diff.y + diff.z*diff.z);
          if (distFromPlayer < 100.0)
               aiState = AI_SCARED;
          else
               aiState = AI_UNCARING;
     }
}