#include <stdint.h>
#include <getopt.h>
#include <easy_io.h>
#include "echo_packet.h"

// 命令行参数结构
typedef struct cmdline_param {
    easy_addr_t             address;
    int                     io_thread_cnt;
    int                     connect_cnt;
    int                     request_size;
    int64_t                 request_cnt;

    // count
    int64_t                 request_byte;
    easy_atomic_t           process_byte;
    easy_atomic_t           send_byte;
    ev_tstamp               start_time;
} cmdline_param;

/*************************************************************************************************
 * 函数定义部分
 *************************************************************************************************/
cmdline_param           cp;
static void print_usage(char *prog_name);
static int parse_cmd_line(int argc, char *const argv[], cmdline_param *cp);
static int echo_process(easy_request_t *r);
static int echo_new_packet(easy_connection_t *c);
static int echo_disconnect(easy_connection_t *c);
static void print_speed();

/**
 * 程序入口
 */
int main(int argc, char **argv)
{
    int                     i, ret;
    easy_io_handler_pt      io_handler;

    // default
    memset(&cp, 0, sizeof(cmdline_param));
    cp.io_thread_cnt = 1;
    cp.connect_cnt = 1;
    cp.request_cnt = 1000;
    cp.request_size = 512;

    // parse cmd line
    if (parse_cmd_line(argc, argv, &cp) == EASY_ERROR)
        return EASY_ERROR;

    // 检查必需参数
    if (cp.address.family == 0) {
        print_usage(argv[0]);
        return EASY_ERROR;
    }

    // 对easy_io初始化, 设置io的线程数, file的线程数
    if (!easy_io_create(cp.io_thread_cnt)) {
        easy_error_log("easy_io_init error.\n");
        return EASY_ERROR;
    }

    // 为监听端口设置处理函数，并增加一个监听端口
    memset(&io_handler, 0, sizeof(io_handler));
    io_handler.decode = echo_decode;
    io_handler.encode = echo_encode;
    io_handler.process = echo_process;
    io_handler.new_packet = echo_new_packet;
    io_handler.on_disconnect = echo_disconnect;
    io_handler.user_data = (void *)(long)cp.request_size;

    // 创建连接
    easy_addr_t             addr;

    for(i = 0; i < cp.connect_cnt; i++) {
        memcpy(&addr, &cp.address, sizeof(easy_addr_t));
        addr.cidx = i;

        if (easy_io_connect(addr, &io_handler, 0, NULL) != EASY_OK) {
            char                    buffer[32];
            easy_error_log("connection failure: %s\n", easy_inet_addr_to_str(&cp.address, buffer, 32));
            break;
        }
    }

    // 起线程并开始
    cp.start_time = ev_time();
    cp.request_byte = cp.request_cnt * cp.request_size;

    if (cp.request_byte < 0) cp.request_byte = ~(((int64_t)1) << 63);

    // 起处理速度统计定时器
    ev_timer                stat_watcher;
    easy_io_stat_t          iostat;
    easy_io_stat_watcher_start(&stat_watcher, 5.0, &iostat, NULL);

    if (easy_io_start()) {
        easy_error_log("easy_io_start error.\n");
        return EASY_ERROR;
    }

    // 等待线程退出
    ret = easy_io_wait();

    // speed
    print_speed();
    easy_io_destroy();

    return ret;
}

/**
 * 命令行帮助
 */
static void print_usage(char *prog_name)
{
    fprintf(stderr, "%s -H host:port -c conn_cnt -n req_cnt -s size [-t thread_cnt]\n"
            "    -H, --host              server address\n"
            "    -c, --conn_cnt          connection count\n"
            "    -n, --req_cnt           request count\n"
            "    -s, --req_size          packet size of every request\n"
            "    -t, --io_thread_cnt     thread count for listen, default: 1\n"
            "    -h, --help              display this help and exit\n"
            "    -V, --version           version and build time\n\n"
            "eg: %s -Hlocalhost:5000 -c2 -n1000 -s512\n\n", prog_name, prog_name);
}

/**
 * 解析命令行
 */
static int parse_cmd_line(int argc, char *const argv[], cmdline_param *cp)
{
    int                     opt;
    const char              *opt_string = "hVH:c:n:s:t:";
    struct option           long_opts[] = {
        {"host", 1, NULL, 'H'},
        {"conn_cnt", 1, NULL, 'c'},
        {"req_cnt", 1, NULL, 'n'},
        {"req_size", 1, NULL, 's'},
        {"io_thread_cnt", 1, NULL, 't'},
        {"help", 0, NULL, 'h'},
        {"version", 0, NULL, 'V'},
        {0, 0, 0, 0}
    };

    opterr = 0;

    while ((opt = getopt_long(argc, argv, opt_string, long_opts, NULL)) != -1) {
        switch (opt) {
        case 'H':
            cp->address = easy_inet_str_to_addr(optarg, 0);
            break;

        case 't':
            cp->io_thread_cnt = atoi(optarg);
            break;

        case 'c':
            cp->connect_cnt = atoi(optarg);
            break;

        case 'n':
            cp->request_cnt = atoi(optarg);
            break;

        case 's':

            if ((cp->request_size = atoi(optarg)) < 128)
                cp->request_size = 128;

            break;

        case 'V':
            fprintf(stderr, "BUILD_TIME: %s %s\n", __DATE__, __TIME__);
            return EASY_ERROR;

        case 'h':
            print_usage(argv[0]);
            return EASY_ERROR;

        default:
            break;
        }
    }

    return EASY_OK;
}

/**
 * 处理函数
 */
static int echo_process(easy_request_t *r)
{
    echo_packet_t           *reply;

    reply = (echo_packet_t *) r->ipacket;
    easy_session_destroy(r->ms);

    if (!reply)
        return EASY_ERROR;

    easy_atomic_add(&cp.process_byte, reply->len);

    if (cp.send_byte >= cp.request_byte && cp.process_byte == cp.send_byte) {
        easy_io_stop();
    }

    return EASY_OK;
}

/**
 * 新建packet
 */
static int echo_new_packet(easy_connection_t *c)
{
    easy_session_t          *s;
    echo_packet_t           *packet;

    if (cp.send_byte >= cp.request_byte)
        return EASY_OK;

    if ((packet = easy_session_packet_create(echo_packet_t, s, cp.request_size)) == NULL)
        return EASY_ERROR;

    packet->data = &packet->buffer[0];
    packet->len = cp.request_size;
    memset(packet->data, 0, packet->len);
    easy_atomic_add(&cp.send_byte, cp.request_size);

    easy_connection_send_session(c, s);
    return EASY_OK;
}

static int echo_disconnect(easy_connection_t *c)
{
    easy_error_log("connect disconnect.\n");
    easy_io_stop();
    return EASY_OK;
}

static void print_speed()
{
    double                  t = ev_time() - cp.start_time;
    // speed
    easy_error_log("process_byte: %" PRIdFAST32 "\nsend_byte: %" PRIdFAST32 "\n", cp.process_byte, cp.send_byte);
    easy_error_log("QPS: %.2f\n", 1.0 * cp.process_byte / t / cp.request_size);
    easy_error_log("Throughput: %.2f MB/s\n", 1.0 * cp.process_byte / t / 1024 / 1024);
}