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/* echld-util.c
 *  utility for echld
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * Copyright (c) 2013 by Luis Ontanon <luis@ontanon.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include "echld-int.h"
#include "echld-util.h"

#include <glib.h>

struct _ping {
        struct timeval tv;
        echld_ping_cb_t cb;
        void* cb_data;
};

static long timevaldiff(struct timeval *starttime, struct timeval *finishtime) {
  long msec;
  msec=(finishtime->tv_sec-starttime->tv_sec)*1000;
  msec+=(finishtime->tv_usec-starttime->tv_usec)/1000;
  return msec;
}

static gboolean pong(echld_msg_type_t type, GByteArray* ba _U_, void* data) {
        struct _ping* p = (struct _ping*)data;
        struct timeval t;
        long ret = -1;
        gettimeofday(&t,NULL);


        switch (type) {
                case ECHLD_PONG:
                        ret = timevaldiff(&(p->tv),&t);
                        break;
                default:
                        ret = -1;
                        break;
        }

        if (p->cb) p->cb(ret, p->cb_data);

        g_free(p);

        return TRUE;
}


extern echld_state_t echld_ping(int chld_id, echld_ping_cb_t pcb, void* cb_data) {
        struct _ping* p = g_new0(struct _ping,1);

        p->cb = pcb;
        p->cb_data = cb_data;
        gettimeofday(&(p->tv),NULL);

        return echld_reqh(chld_id, ECHLD_PING, 0, NULL, pong, p);
}


struct _get_param {
        const char* name;
        echld_param_cb_t cb;
        void* cb_data;
        echld_bool_t (*dec)(enc_msg_t*, char**, char**);
        echld_bool_t (*dec_err)(enc_msg_t*, int* , char**);
        const char** err_msg;
};

#define CHNULL ((char*)NULL)

static gboolean got_param(echld_msg_type_t type, GByteArray* ba _U_, void* data) {
        struct _get_param* g = (struct _get_param*)data;
        char* err_msg;

        switch (type) {
                case ECHLD_PARAM:
                        if (g->cb) {
                                char* param;
                                char* value;
                                g->dec(ba,&param,&value);
                                g->cb(param,value,NULL,g->cb_data);

                        }
                        break;
                case ECHLD_ERROR: {
                        int errnum;
                        g->dec_err(ba,&errnum,&err_msg);
                        g->cb(NULL,NULL,err_msg,g->cb_data);
                        break;
                }
                default:
                        err_msg = g_strdup_printf("other type='%s'",TY(type));
                        g->cb(NULL,NULL,err_msg,g->cb_data);
                        g_free(err_msg);
                        break;
        }

        g_free(g);
        return TRUE;
}

extern echld_state_t echld_get_param(int chld_id, const char* param, echld_param_cb_t acb, void* cb_data) {
        struct _get_param* g = g_new0(struct _get_param,1);
        echld_parent_encoder_t* enc;
        parent_decoder_t* dec;
        enc_msg_t* em;

        echld_get_all_codecs(NULL, NULL, &enc, &dec);

        em = enc->get_param(param);

        g->name = param;
        g->cb = acb;
        g->cb_data = cb_data;
        g->dec = dec->param;
        g->dec_err = dec->error;

        return echld_reqh(chld_id, ECHLD_GET_PARAM, 0, em, got_param, g);
}

extern echld_state_t echld_set_param(int chld_id, const char* param, const char* value, echld_param_cb_t acb, void* cb_data) {
        struct _get_param* g = g_new0(struct _get_param,1);
        echld_parent_encoder_t* enc;
        parent_decoder_t* dec;
        enc_msg_t* em;

        echld_get_all_codecs(NULL, NULL, &enc, &dec);

        em = enc->set_param(param,value);

        g->name = param;
        g->cb = acb;
        g->cb_data = cb_data;
        g->dec = dec->param;
        g->dec_err = dec->error;

        return echld_reqh(chld_id, ECHLD_SET_PARAM, 0, em, got_param, g);
}

typedef struct _close {
        echld_close_cb_t cb;
        void* cb_data;
} close_t;

static gboolean closed(echld_msg_type_t type, GByteArray* ba, void* data) {
        close_t* c = (close_t*)data;
        parent_decoder_t* dec;
        char* err_msg;

        echld_get_all_codecs(NULL, NULL, NULL, &dec);

        switch (type) {
                case ECHLD_CLOSING: {
                        if (c->cb) {
                                c->cb(NULL,c->cb_data);
                        }
                        break;
                }
                case ECHLD_ERROR: {
                        int errnum;

                        if ( dec->error(ba, &errnum ,&err_msg) ) {
                                c->cb(err_msg,c->cb_data);
                                g_free(err_msg);
                        } else {
                                c->cb("Canot decode error message",c->cb_data);
                        }
                        break;
                }
                default:
                        err_msg = g_strdup_printf("other type='%s'",TY(type));
                        c->cb(err_msg,c->cb_data);
                        g_free(err_msg);
                        break;
        }

        g_free(c);
        return TRUE;

}

echld_state_t echld_close(int child_id, echld_close_cb_t pcb, void* cb_data) {
        close_t* c = g_new0(close_t,1);
        c->cb = pcb;
        c->cb_data = cb_data;

        return echld_reqh(child_id,ECHLD_CLOSE_CHILD, 0, NULL, closed, c);
}