#include <cmath>

#include "Shooting/ImageManager.h"
#include "Shooting/Tuning/GameTuning.h"

#include "Shooting/Enemy.h"

namespace dxgame::shooting
{
    void Enemy::Spawn(const Vector2& startPosition, float speed, Behaviour spawnBehaviour)
    {
        position = startPosition;
        baseX = startPosition.x;
        moveSpeed = speed;
        age = 0.0f;
        hp = tuning::enemy::MaxHp;
        behaviour = spawnBehaviour;
        isActive = true;
    }

    void Enemy::Update(float deltaTime)
    {
        if (!isActive)
            return;

        age += deltaTime;
        position.y += moveSpeed * deltaTime;

        if (behaviour == Behaviour::Wave)
        {
            float waveOffset = std::sin(age * tuning::enemy::WaveSpeed)
                * tuning::enemy::WaveAmplitude;
            position.x = baseX + waveOffset;
        }

        if (GetHitbox().y > tuning::ScreenHeight)
            Deactivate();
    }

    void Enemy::Draw(const ImageManager& images) const
    {
        if (!isActive)
            return;

        images.Draw(ImageManager::Id::Enemy, GetDrawRect());
    }

    void Enemy::TakeDamage(int damage)
    {
        hp -= damage;

        if (hp <= 0)
            Deactivate();
    }

    bool Enemy::IsActive() const
    {
        return isActive;
    }

    void Enemy::Deactivate()
    {
        isActive = false;
    }

    Rect Enemy::GetDrawRect() const
    {
        return tuning::enemy::DrawRect.MovedBy(position);
    }

    Rect Enemy::GetHitbox() const
    {
        return tuning::enemy::Hitbox.MovedBy(position);
    }
}