#pragma once

// ============================================================================
// world.h - 实体组件系统 (ECS)
// ============================================================================

#include <stdint.h>
#include "../include/engine_api.h"

#define MAX_ENTITIES 4096
#define MAX_COMPONENTS 32

typedef uint32_t Entity;
typedef uint32_t ComponentType;

// 组件接口
typedef struct {
    void (*destroy)(void* component);
} ComponentVTable;

// 世界
typedef struct {
    Entity entities[MAX_ENTITIES];
    uint32_t entity_count;
    uint32_t next_entity;

    void* components[MAX_COMPONENTS][MAX_ENTITIES];
    ComponentVTable component_tables[MAX_COMPONENTS];
    uint32_t component_sizes[MAX_COMPONENTS];
    uint32_t component_count;

    uint64_t entity_masks[MAX_ENTITIES];
} World;

// 创建/销毁
World* world_create(void);
void world_destroy(World* world);

// 实体
Entity world_create_entity(World* world);
void world_destroy_entity(World* world, Entity entity);
int world_entity_alive(World* world, Entity entity);

// 组件
ComponentType world_register_component(World* world, uint32_t size, ComponentVTable vtable);
void* world_add_component(World* world, Entity entity, ComponentType type);
void* world_get_component(World* world, Entity entity, ComponentType type);
void world_remove_component(World* world, Entity entity, ComponentType type);
int world_has_component(World* world, Entity entity, ComponentType type);

// 系统遍历
typedef void (*SystemFunc)(World* world, Entity entity, void* data);
void world_each(World* world, uint64_t mask, SystemFunc func, void* data);