/**
 * @describe:
 * @author: Jerry Yang(hy0kle@gmail.com)
 * */

#include "server.h"
#include "handler.h"

static const char *
get_error_message(error_code_e code)
{
    switch (code)
    {
        case E_SUCCESS:
            return "OK";

        case SERVICE_IS_UNAVAILABLE:
            return "后端服务不可用";

        case E_CMD_UNDEFINED:
            return "操作命令不存在";
    }

    return "未知错误";
}

static void
build_code_msg(cJSON *json, error_code_e code)
{
    cJSON_AddItemToObject(json, RES_CODE, cJSON_CreateNumber(code));
    cJSON_AddItemToObject(json, RES_MSG,  cJSON_CreateString(get_error_message(code)));

    return;
}

static void
rebuild_code_msg(cJSON *json, error_code_e code)
{
    cJSON_ReplaceItemInObject(json, RES_CODE, cJSON_CreateNumber(code));
    cJSON_ReplaceItemInObject(json, RES_MSG,  cJSON_CreateString(get_error_message(code)));

    return;
}

static void
rpc_cmd_echo(struct bufferq *bufferq)
{
    cJSON *json = bufferq->response.json;
    cJSON *data = cJSON_CreateObject();

    cJSON_AddItemToObject(json, RES_DATA, data);
    cJSON_AddItemToObject(data, "echo_data", cJSON_CreateString(bufferq->request.buf));

    return;
}

static void
rpc_cmd_test(struct bufferq *bufferq)
{
    cJSON *json = bufferq->response.json;
    cJSON *data = cJSON_CreateObject();

    char test[1024];
    test[0] = '\0';

    char *wday[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
    time_t timep;
    struct tm *tp;
    struct timeval tv;

    time(&timep);           /* 获取 time_t 类型当前时间 */
    //tp = gmtime(&timep);    /* 转换为 struct tm 结构的UTC时间 */
    /** 谷歌后得知: localtime() 返回的是静态指针,不需要 free() */
    tp = localtime(&timep);        /* 转换为 struct tm 结构的当地时间 */
    gettimeofday(&tv, NULL);

    snprintf(test, 1024, "Just for test. [timestamp: %ld] [%d/%02d/%02d %s %02d:%02d:%02d]",
        GETSTIME(tv),
        1900 + tp->tm_year, 1 + tp->tm_mon, tp->tm_mday,
        wday[tp->tm_wday],
        tp->tm_hour, tp->tm_min, tp->tm_sec);

    cJSON_AddItemToObject(json, RES_DATA, data);
    cJSON_AddItemToObject(data, "test",        cJSON_CreateString(test));
    cJSON_AddItemToObject(data, "timestamp",   cJSON_CreateNumber(GETSTIME(tv)));
    cJSON_AddItemToObject(data, "millisecond", cJSON_CreateNumber(GETMTIME(tv)));
    cJSON_AddItemToObject(data, "microsecond", cJSON_CreateNumber(GETUTIME(tv)));

    return;
}

static void
rpc_cmd_undefined(struct bufferq *bufferq)
{
    cJSON *json = bufferq->response.json;
    cJSON *data = cJSON_CreateObject();

    rebuild_code_msg(json, E_CMD_UNDEFINED);
    cJSON_AddItemToObject(json, RES_DATA, data);

    return;
}

void
rpc_handler(struct bufferq *bufferq)
{
    int cmd = cJSON_GetObjectItem(bufferq->request.json, "cmd")->valueint;
    zlog_debug(g_zc, "[cmd: %d]", cmd);

    /** 初始化响应体基本结构 {"code": 0, "message": "OK"} */
    build_code_msg(bufferq->response.json, E_SUCCESS);

    switch (cmd)
    {
        case CMD_ECHO:
            rpc_cmd_echo(bufferq);
            break;

        case CMD_TEST:
            rpc_cmd_test(bufferq);
            break;

        default:
            rpc_cmd_undefined(bufferq);
    }

    /** 构造响应体的 json 包 */
    bufferq->response.buf      = cJSON_PrintUnformatted(bufferq->response.json);
    bufferq->response.body_len = strlen(bufferq->response.buf);

    return;
}