/**
 * @file datarouter.h
 * @brief 数据路由库 —— 公共接口
 *
 * ## 概念
 *
 * - **发送能力**：编译期声明的可发送报文类型，生成 datarouter_send_<id>(data, len)
 * - **接收能力**：编译期声明的可接收报文类型，生成 datarouter_on_recv_<id>(port, data, len)
 * - **端口**：运行期创建的连接点，包含 send_type + handler 列表
 *
 * ## 路由
 *
 * 调用 datarouter_send_<id>(data, len) 时，库遍历所有端口，
 * 找到 send_type 匹配的端口，逐一调用其全部 handler。无需指定从哪个端口发送。
 *
 * 接收侧由用户自行调用 datarouter_on_recv_<id>(port, data, len) 处理外设收到的数据。
 */

#ifndef DATAROUTER_H
#define DATAROUTER_H

#include <stdint.h>
#include <stddef.h>

#if defined(__has_include)
#  if __has_include(<datarouter_config.h>)
#    include <datarouter_config.h>
#  else
#    include "datarouter_config.h"
#  endif
#else
#  include "datarouter_config.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* ========== 发送能力枚举 ========== */

enum datarouter_send_cap {
#define DATAROUTER_SEND(id, desc) DATAROUTER_SEND_##id,
    DATAROUTER_SEND_CAPABILITIES
#undef DATAROUTER_SEND
    DATAROUTER_SEND_CAP_COUNT
};

/* ========== 接收能力枚举 ========== */

enum datarouter_recv_cap {
#define DATAROUTER_RECV(id, desc) DATAROUTER_RECV_##id,
    DATAROUTER_RECV_CAPABILITIES
#undef DATAROUTER_RECV
    DATAROUTER_RECV_CAP_COUNT
};

/* ========== 外设发送 handler ========== */

typedef void (*datarouter_send_handler_t)(uint32_t port_id, const void *data, size_t len);

#ifndef DATAROUTER_MAX_HANDLERS_PER_PORT
#define DATAROUTER_MAX_HANDLERS_PER_PORT 4
#endif

/* ========== 发送触发函数 ========== */

#define DATAROUTER_SEND(id, desc) \
    int datarouter_send_##id(const void *data, size_t len);
DATAROUTER_SEND_CAPABILITIES
#undef DATAROUTER_SEND

/* ========== 接收回调声明 ========== */

#define DATAROUTER_RECV(id, desc) \
    void datarouter_on_recv_##id(uint32_t port_id, const void *data, size_t len);
DATAROUTER_RECV_CAPABILITIES
#undef DATAROUTER_RECV

/* ========== 端口管理 API ========== */

typedef int32_t datarouter_port_t;
#define DATAROUTER_INVALID_PORT ((datarouter_port_t)-1)

void datarouter_init(void);
void datarouter_reset(void);

datarouter_port_t datarouter_port_create(void);
void datarouter_port_delete(datarouter_port_t port);

void datarouter_port_set_send_type(datarouter_port_t port, int cap_id);
int  datarouter_port_get_send_type(datarouter_port_t port);

int  datarouter_port_add_handler(datarouter_port_t port, datarouter_send_handler_t handler);
int  datarouter_port_remove_handler(datarouter_port_t port, datarouter_send_handler_t handler);
void datarouter_port_clear_handlers(datarouter_port_t port);
int  datarouter_port_handler_count(datarouter_port_t port);

/* ========== 能力元数据查询 ========== */

int         datarouter_send_cap_count(void);
const char *datarouter_send_cap_name(int cap_id);
const char *datarouter_send_cap_desc(int cap_id);

int         datarouter_recv_cap_count(void);
const char *datarouter_recv_cap_name(int cap_id);
const char *datarouter_recv_cap_desc(int cap_id);

#ifdef __cplusplus
}
#endif

#endif /* DATAROUTER_H */