#include "level.hpp"

#include "camera.hpp"
#include "ecs.hpp"

LevelHandle nextHandle = LevelHandle{0};
long levelCount = 0;
constexpr long LEVEL_NAME_LENGTH = 16;
PkeLevel LEVELS[MAX_LEVEL_COUNT];

PkeLevel *PkeLevel_Get_Inner(LevelHandle handle) {
	for (long i = 0; i < MAX_LEVEL_COUNT; ++i) {
		if (LEVELS[i].levelHandle == handle) {
			return &LEVELS[i];
		}
	}
	return nullptr;
}

LevelHandle PkeLevel_Create(const char *levelName) {
	assert(levelCount < MAX_LEVEL_COUNT && "only MAX_LEVEL_COUNT levels can be loaded at once");
	levelCount += 1;

	PkeLevel *lvl = PkeLevel_Get_Inner(LevelHandle_MAX);
	assert(lvl != nullptr && "max level count not reached, but failed to find a valid level slot");

	if (lvl->bkt == nullptr) {
		lvl->bkt = Pke_BeginTransientBucket();
	}
	lvl->levelHandle = nextHandle;
	++nextHandle;

	auto len = strlen(levelName);
	auto start = len <= (LEVEL_NAME_LENGTH - 1) ? 0 : len - (LEVEL_NAME_LENGTH - 1);
	strncpy(lvl->name, levelName + start, LEVEL_NAME_LENGTH);
	return lvl->levelHandle;
}

PkeLevel *PkeLevel_Get(LevelHandle handle) {
	return PkeLevel_Get_Inner(handle);
}

LevelHandle PkeLevel_GetHandle(const char *levelName) {
	char safeName[LEVEL_NAME_LENGTH];
	auto len = strlen(levelName);
	auto start = len <= (LEVEL_NAME_LENGTH - 1) ? 0 : len - (LEVEL_NAME_LENGTH - 1);
	strncpy(safeName, levelName + start, LEVEL_NAME_LENGTH);
	for (long i = 0; i < MAX_LEVEL_COUNT; ++i) {
		if (LEVELS[i].levelHandle != LevelHandle_MAX) {
			if (strcmp(safeName, LEVELS[i].name)) {
				return LEVELS[i].levelHandle;
			}
		}
	}
	return LevelHandle_MAX;
}

void PkeLevel_RegisterCamera(LevelHandle levelHandle, CameraHandle cameraHandle) {
	assert(levelHandle != LevelHandle_MAX);
	assert(cameraHandle != CameraHandle_MAX);
	PkeLevel *lvl = PkeLevel_Get_Inner(levelHandle);
	assert(lvl != nullptr && "Failed to find level by requested LevelHandle");
	PkeArray_Add(&lvl->cameras, cameraHandle, lvl->bkt);
}

void PkeLevel_Remove(LevelHandle handle) {
	PkeLevel *lvl = PkeLevel_Get_Inner(handle);
	assert(lvl != nullptr && "Failed to find level to remove by requested LevelHandle");
	levelCount -= 1;
	ECS_MarkForRemoval(lvl);
	for (long i = 0; i < lvl->cameras.next; ++i) {
		PkeCamera_Destroy(lvl->cameras.data[i]);
	}
	PkeArray_HardReset<CameraHandle>(&lvl->cameras);
	Pke_ResetBucket(lvl->bkt);
	lvl->levelHandle = LevelHandle_MAX;
}