#include "camera.hpp"
#include "memory.hpp"

PkeCamera NullCamera {
	.handle = CameraHandle_MAX,
	.pos = glm::vec3(3.f, 3.f, 3.f),
	.rot = glm::quat(1.f, 0.f, 0.f, 0.f),
	.target = glm::vec3(0.f),
	.type = PKE_CAMERA_TYPE_ORTHOGONAL,
	.orientation = PKE_CAMERA_ORIENTATION_TARGET,
	.stale = PKE_CAMERA_STALE_ALL,
};
PkeCamera *ActiveCamera = &NullCamera;

const PkeHandleItemIndex_T MAX_CAMERAS_PER_BUCKET = 32;
struct CameraBucket {
	PkeCamera cameras[MAX_CAMERAS_PER_BUCKET];
};
BucketContainer<CameraBucket, CameraHandle> Camera_BucketContainer{};

PkeCamera &PkeCamera_Register() {
	bool moved = false;
	CameraHandle activeHandle = ActiveCamera->handle;
	CameraHandle cameraHandle{Buckets_NewHandle<CameraBucket>(MAX_CAMERAS_PER_BUCKET, Camera_BucketContainer, moved)};
	if (moved) {
		ActiveCamera = PkeCamera_Get(activeHandle);
	}
	auto &cam = Camera_BucketContainer.buckets[cameraHandle.bucketIndex].cameras[cameraHandle.itemIndex];
	cam.handle = cameraHandle;
	return cam;
}

PkeCamera *PkeCamera_Get(CameraHandle cameraHandle) {
	assert(cameraHandle != CameraHandle_MAX);
	return &Camera_BucketContainer.buckets[cameraHandle.bucketIndex].cameras[cameraHandle.itemIndex];
}

void PkeCamera_Destroy(CameraHandle cameraHandle) {
	assert(cameraHandle != CameraHandle_MAX);
	auto &cam = Camera_BucketContainer.buckets[cameraHandle.bucketIndex].cameras[cameraHandle.itemIndex];
	cam.handle = CameraHandle_MAX;
	cam.pos = glm::vec3(0);
	cam.rot = glm::quat{};
	cam.target = glm::vec3(0);
	cam.type = PkeCameraType_MAX;
	cam.orientation = PkeCameraOrientation_MAX;
	cam.stale = PkeCameraStaleFlags_MAX;
}

int64_t PkeCamera_GetBucketCount() {
	return Camera_BucketContainer.pkeHandle.bucketIndex + 1;
}

PkeCamera *PkeCamera_GetCameras(int64_t bucketIndex, int64_t &count) {
	if (Camera_BucketContainer.pkeHandle.bucketIndex == bucketIndex) {
		count = Camera_BucketContainer.pkeHandle.itemIndex;
	} else {
		count = MAX_CAMERAS_PER_BUCKET;
	}
	return Camera_BucketContainer.buckets[bucketIndex].cameras;
}

void PkeCamera_Init() {
	Buckets_Init(Camera_BucketContainer);
}

void PkeCamera_Teardown() {
	Buckets_Destroy(Camera_BucketContainer);
}