/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO 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 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO 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 DOUBANGO.
*
*/

/**@file tsk_params.c
 * @brief SIP/MSRP/XCAP Parameters parser.
 *
 * @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
 *

 */
#include "tsk_params.h"
#include "tsk_memory.h"
#include "tsk_string.h"
#include "tsk_common.h"
#include "tsk_debug.h"

#include <string.h>

/**@defgroup tsk_params_group SIP/MSRP/XCAP Parameters parser.
*/

/* Predicate function used to find a parameter by name (case-insensitive).
*/
static int pred_find_param_by_name(const tsk_list_item_t *item, const void *name)
{
    if(item && item->data) {
        tsk_param_t *param = (tsk_param_t*)item->data;
        return tsk_stricmp(param->name, (const char*)name);
    }
    return -1;
}

/**@ingroup tsk_params_group
*/
tsk_param_t* tsk_param_create(const char* name, const char* value)
{
    return (tsk_param_t*)tsk_object_new(TSK_PARAM_VA_ARGS(name, value));
}

/**@ingroup tsk_params_group
*/
tsk_param_t* tsk_param_create_null()
{
    return tsk_param_create(tsk_null, tsk_null);
}

/**@ingroup tsk_params_group
* Converts a key-value-pair string (kvp) to @ref tsk_param_t object.
* @param line The kvp (e.g. 'branch=z9hG4bK652hsge') string to parse.
* @param size The size (length) of the kvp string.
* @retval @ref tsk_param_t object.
*/
tsk_param_t *tsk_params_parse_param(const char* line, tsk_size_t size)
{
    if(line && size) {
        const char* start = line;
        const char* end = (line + size);
        const char* equal = strstr(line, "=");
        tsk_param_t *param = tsk_param_create_null();

        if (param && equal && equal<end) {
            if ((param->name = (char*)tsk_calloc((tsk_size_t)((equal - start) + 1), sizeof(const char)))) {
                memcpy(param->name, start, (equal - start));
            }

            if ((param->value = (char*)tsk_calloc((tsk_size_t)((end - equal - 1) + 1), sizeof(const char)))) {
                memcpy(param->value, equal + 1, (end - equal - 1));
            }
        }
        else if (param) {
            if ((param->name = (char*)tsk_calloc((tsk_size_t)((end - start) + 1), sizeof(const char)))) {
                memcpy(param->name, start, (end - start));
            }
        }

        return param;
    }
    return tsk_null;
}
/**@ingroup tsk_params_group
* Checks if the supplied list of parameters contains a parameter named @a name (case-insensitive).
* @param self The list of parameters into which to search.
* @param name The name of the parameter to search.
* @retval @ref tsk_true if the parameter exist and @ref tsk_false otherwise.
*/
tsk_bool_t tsk_params_have_param(const tsk_params_L_t *self, const char* name)
{
    if(self) {
        if(tsk_list_find_item_by_pred(self, pred_find_param_by_name, name)) {
            return tsk_true;
        }
    }
    else {
        TSK_DEBUG_ERROR("Invalid parameter");
    }
    return tsk_false;
}

/**@ingroup tsk_params_group
* Adds a parameter to the list of parameters. If the parameter already exist(case-insensitive), then it's value will be updated.
* @param self The destination list.
* @param name The name of the parameter to add.
* @param value The value of the parameter to add.
* @retval Zero if succeed and -1 otherwise.
*/
int tsk_params_add_param(tsk_params_L_t **self, const char* name, const char* value)
{
    tsk_param_t *param;

    if(!self || !name) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    if(!*self) {
        *self = tsk_list_create();
    }

    if((param = (tsk_param_t*)tsk_params_get_param_by_name(*self, name))) {
        tsk_strupdate(&param->value, value); /* Already exist ==> update the value. */
    }
    else {
        param = tsk_param_create(name, value);
        tsk_list_push_back_data(*self, (void**)&param);
    }

    return 0;
}

int tsk_params_add_param_2(tsk_params_L_t **self, const tsk_param_t* param)
{
    if(!self || !param || !param) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    return tsk_params_add_param(self, param->name, param->value);
}

int tsk_params_add_param_3(tsk_params_L_t **self, const char* name, int64_t value)
{
    tsk_istr_t value_str;
    tsk_itoa(value, &value_str);
    return tsk_params_add_param(self, name, value_str);
}

/**@ingroup tsk_params_group
* Removes a parameter from the list of parameters.
* @param self The list from which to remove the parameter.
* @param name The name(case-insensitive) of the parameter to remove.
* @retval Zero if succeed and -1 otherwise.
*/
int tsk_params_remove_param(tsk_params_L_t *self, const char* name)
{
    if(self) {
        tsk_list_remove_item_by_pred(self, pred_find_param_by_name, name);
        return 0;
    }
    else {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }
}

/**@ingroup tsk_params_group
* Gets a parameter from the list of parameters by name.
* @param self The source list.
* @param name The name(case-insensitive) of the parameter to retrieve.
* @retval @ref tsk_param_t if succeed and @ref tsk_null otherwise.
*/
const tsk_param_t *tsk_params_get_param_by_name(const tsk_params_L_t *self, const char* name)
{
    if(self) {
        const tsk_list_item_t *item_const = tsk_list_find_item_by_pred(self, pred_find_param_by_name, name);
        if(item_const) {
            return (const tsk_param_t*)item_const->data;
        }
    }
    else {
        TSK_DEBUG_ERROR("Invalid parameter");
    }
    return tsk_null;
}

/**@ingroup tsk_params_group
* Gets the value of a parameter.
* @param self The source list.
* @param name The name(case-insensitive) of the parameter to retrieve.
* @retval The value of the parameter if succeed and NULL otherwise.
*/
const char *tsk_params_get_param_value(const tsk_params_L_t *self, const char* name)
{
    if(self && name) {
        const tsk_list_item_t *item_const = tsk_list_find_item_by_pred(self, pred_find_param_by_name, name);
        if(item_const && item_const->data) {
            return ((const tsk_param_t *)item_const->data)->value;
        }
    }
    else {
        TSK_DEBUG_ERROR("Invalid parameter");
    }
    return tsk_null;
}

/**@ingroup tsk_params_group
* Gets the value of a parameter.
* @param self The source list.
* @param name The name(case-insensitive) of the parameter to retrieve.
* @retval The value of the parameter if succeed and -1 otherwise.
*/
int tsk_params_get_param_value_as_int(const tsk_params_L_t *self, const char* name)
{
    const char *value = tsk_params_get_param_value(self, name);
    return value ? atoi(value) : -1;
}

/**@ingroup tsk_params_group
* Serializes a @ref tsk_param_t object.
* @param param The parameter to serialize.
* @param output The output buffer.
* @retval Zero if succeed and -1 otherwise.
*/
int tsk_params_param_tostring(const tsk_param_t *param, tsk_buffer_t* output)
{
    if(param) {
        return tsk_buffer_append_2(output, param->value?"%s=%s":"%s", param->name, param->value);
    }
    return -1;
}

/**@ingroup tsk_params_group
* Serializes a @ref tsk_params_L_t object.
* @param self The list of parameters to serialize.
* @param separator The character to use as separator between params.
* @param output The output buffer.
* @retval Zero if succeed and non-zero error code otherwise.
*/
int tsk_params_tostring(const tsk_params_L_t *self, const char separator, tsk_buffer_t* output)
{
    int ret = -1;

    if(self) {
        tsk_list_item_t *item;
        ret = 0; // for empty lists
        tsk_list_foreach(item, self) {
            tsk_param_t* param = (tsk_param_t*)item->data;
            //tsk_params_param_tostring(param, output);
            if(TSK_LIST_IS_FIRST(self, item)) {
                if((ret = tsk_buffer_append_2(output, param->value?"%s=%s":"%s", param->name, param->value))) {
                    goto bail;
                }
            }
            else {
                if((ret = tsk_buffer_append_2(output, param->value?"%c%s=%s":"%c%s", separator, param->name, param->value))) {
                    goto bail;
                }
            }
        }
    }

bail:
    return ret;
}

/**@ingroup tsk_params_group
*/
tsk_params_L_t* tsk_params_fromstring(const char* string, const char* separator, tsk_bool_t trim)
{
    tsk_params_L_t* params = tsk_null;
    tsk_param_t* param;

    int i = 0, index;
    tsk_size_t size = tsk_strlen(string);

#define PUSH_PARAM() \
	if(!params){ \
		params = tsk_list_create(); \
	} \
	if(trim){ \
		if(param->name){ \
			tsk_strtrim(&param->name); \
		} \
		if(param->value){ \
			tsk_strtrim(&param->value); \
		} \
	} \
	tsk_list_push_back_data(params, (void**)&param);

    while((index = tsk_strindexOf((string + i), (size - i), separator)) != -1) {
        if((param = tsk_params_parse_param((string + i), index))) {
            PUSH_PARAM();
        }
        i += (index + 1);
    }

    // last one
    if(i<(int)size) {
        if((param = tsk_params_parse_param((string + i), (size - i)))) {
            PUSH_PARAM();
        }
    }

    return params;
}





















//=================================================================================================
//	param object definition
//
static tsk_object_t* tsk_param_ctor(tsk_object_t* self, va_list * app)
{
    tsk_param_t *param = (tsk_param_t*)self;
    if(param) {
        const char* name = va_arg(*app, const char *);
        const char* value = va_arg(*app, const char *);

        if(!tsk_strnullORempty(name)) {
            param->name = tsk_strdup(name);
            if(!tsk_strnullORempty(value)) {
                param->value = tsk_strdup(value);
            }
        }
    }

    return self;
}

static tsk_object_t* tsk_param_dtor(tsk_object_t* self)
{
    tsk_param_t *param = (tsk_param_t*)self;
    if(param) {
        TSK_FREE(param->name);
        TSK_FREE(param->value);
    }

    return self;
}

static const tsk_object_def_t tsk_param_def_s = {
    sizeof(tsk_param_t),
    tsk_param_ctor,
    tsk_param_dtor,
    tsk_null,
};
const tsk_object_def_t *tsk_param_def_t = &tsk_param_def_s;