/* wolfmqtt_stub.c
 *
 * Copyright (C) 2006-2024 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL 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.
 *
 * wolfSSL 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <wolfssl/ssl.h>
#include "wolfmqtt_stub.h"

/* MQTT client context */
static MqttClientContext mqttCtx;

/* Initialize MQTT client */
int mqtt_client_init(void)
{
    printf("Initializing MQTT client (stub implementation)\n");
    
    /* Initialize context */
    memset(&mqttCtx, 0, sizeof(MqttClientContext));
    
    /* Allocate buffers */
    mqttCtx.tx_buf = (unsigned char*)malloc(MAX_BUFFER_SIZE);
    mqttCtx.rx_buf = (unsigned char*)malloc(MAX_BUFFER_SIZE);
    
    if (mqttCtx.tx_buf == NULL || mqttCtx.rx_buf == NULL) {
        printf("Failed to allocate buffers\n");
        mqtt_client_cleanup();
        return -1;
    }
    
    /* Connect to broker */
    printf("Connecting to MQTT broker %s:%d\n", MQTT_HOST, MQTT_PORT);
    
    /* Create TLS connection */
    printf("Creating TLS connection\n");
    
    /* Initialize wolfSSL */
    if (wolfSSL_Init() != WOLFSSL_SUCCESS) {
        printf("Failed to initialize wolfSSL\n");
        return -1;
    }
    
    /* Create and initialize WOLFSSL_CTX */
    WOLFSSL_CTX* ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method());
    if (ctx == NULL) {
        printf("Failed to create WOLFSSL_CTX\n");
        return -1;
    }
    
    /* Load CA certificate */
    if (wolfSSL_CTX_load_verify_locations(ctx, MQTT_TLS_CA_CERT, NULL) != WOLFSSL_SUCCESS) {
        printf("Failed to load CA certificate: %s\n", MQTT_TLS_CA_CERT);
        wolfSSL_CTX_free(ctx);
        return -1;
    }
    
    /* Load client certificate */
    if (wolfSSL_CTX_use_certificate_file(ctx, MQTT_TLS_CLIENT_CERT, WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
        printf("Failed to load client certificate: %s\n", MQTT_TLS_CLIENT_CERT);
        wolfSSL_CTX_free(ctx);
        return -1;
    }
    
    /* Load client key */
    if (wolfSSL_CTX_use_PrivateKey_file(ctx, MQTT_TLS_CLIENT_KEY, WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
        printf("Failed to load client key: %s\n", MQTT_TLS_CLIENT_KEY);
        wolfSSL_CTX_free(ctx);
        return -1;
    }
    
    /* Store context */
    mqttCtx.ssl_ctx = ctx;
    
    /* Subscribe to topic */
    printf("Subscribing to topic: %s\n", MQTT_TOPIC);
    
    /* Publish test message */
    printf("Publishing test message to topic: %s\n", MQTT_TOPIC);
    
    return 0;
}

/* Cleanup MQTT client */
int mqtt_client_cleanup(void)
{
    printf("Cleaning up MQTT client (stub implementation)\n");
    
    /* Free SSL context */
    if (mqttCtx.ssl_ctx) {
        wolfSSL_CTX_free(mqttCtx.ssl_ctx);
        mqttCtx.ssl_ctx = NULL;
    }
    
    /* Free buffers */
    if (mqttCtx.tx_buf) {
        free(mqttCtx.tx_buf);
        mqttCtx.tx_buf = NULL;
    }
    
    if (mqttCtx.rx_buf) {
        free(mqttCtx.rx_buf);
        mqttCtx.rx_buf = NULL;
    }
    
    /* Cleanup wolfSSL */
    wolfSSL_Cleanup();
    
    return 0;
}

/* Get MQTT client context */
MqttClientContext* mqtt_client_get_context(void)
{
    return &mqttCtx;
}

/* Process MQTT messages */
int mqtt_client_process_message(void)
{
    printf("Processing MQTT messages (stub implementation)\n");
    
    /* Simulate message processing */
    sleep(1);
    
    return 0;
}

/* Send MQTT ping */
int mqtt_client_ping(void)
{
    printf("Sending MQTT ping (stub implementation)\n");
    
    return 0;
}