#include "Firewall.h"

ESPFirewall::ESPFirewall(int port)
{
    this->amount_of_rules = 0;
    this->head = NULL;
    log_i("Starting Firewall-API on %i", port);
    this->firewall_api = new WebServer(port);
    this->setup_routing();
    this->add_rule_to_firewall("192.168.0.1", "192.168.0.10", "TCP", "DROP");
    this->add_rule_to_firewall("192.168.0.2", "192.168.0.15", "UDP", "REJECT");
}

void ESPFirewall::setup_routing()
{
    this->firewall_api->on("/api/v1/firewall", HTTP_GET, std::bind(&ESPFirewall::get_firewall_handler, this));
    this->firewall_api->on("/api/v1/firewall", HTTP_POST, std::bind(&ESPFirewall::post_firewall_handler, this));
    this->firewall_api->begin();
}

void ESPFirewall::custom_message_response(const char *message, int response_code)
{
    cJSON *json_response = cJSON_CreateObject();
    cJSON_AddBoolToObject(json_response, "ok", true);
    cJSON_AddStringToObject(json_response, "message", message);
    this->firewall_api->send(response_code, "application/json", cJSON_Print(json_response));
    cJSON_Delete(json_response);
}

void ESPFirewall::prepare_firewall_json(cJSON *jsonResponse, firewall_rule_t *link)
{
    cJSON_AddBoolToObject(jsonResponse, "ok", true);
    cJSON_AddNumberToObject(jsonResponse, "number", link->key);
    cJSON_AddStringToObject(jsonResponse, "source", link->source);
    cJSON_AddStringToObject(jsonResponse, "destination", link->destination);
    cJSON_AddStringToObject(jsonResponse, "protocol", link->protocol);
    cJSON_AddStringToObject(jsonResponse, "target", link->target);
}

firewall_rule_t *ESPFirewall::add_rule_to_firewall(const char *source, const char *destination, const char *protocol, const char *target)
{
    firewall_rule_t *temp;
    firewall_rule_t *link = (firewall_rule_t *)malloc(sizeof(firewall_rule_t));
    link->key = ++amount_of_rules;
    strcpy(link->source, source);
    strcpy(link->destination, destination);
    strcpy(link->protocol, protocol);
    strcpy(link->target, target);
    if (head == NULL)
    {
        head = link;
        link->next = NULL;
        return link;
    }
    temp = head;
    while (temp->next != NULL)
    {
        temp = temp->next;
    }
    temp->next = link;
    link->next = NULL;
    return link;
}

void ESPFirewall::post_firewall_handler()
{
    if ((firewall_api->hasArg("source") || firewall_api->hasArg("destination") || firewall_api->hasArg("protocol") || firewall_api->hasArg("target")) == false)
    {
        this->custom_message_response("not enough erguments provided", 400);
    }
    else
    {
        const char *source = firewall_api->arg("source").c_str();
        const char *destination = firewall_api->arg("destination").c_str();
        const char *protocol = firewall_api->arg("protocol").c_str();
        const char *target = firewall_api->arg("target").c_str();
        firewall_rule_t *ptr = this->add_rule_to_firewall(source, destination, protocol, target);
        cJSON *json_response = cJSON_CreateObject();
        prepare_firewall_json(json_response, ptr);
        this->firewall_api->send(200, "application/json", cJSON_Print(json_response));
    }
}

void ESPFirewall::get_firewall_handler()
{
    firewall_rule_t *ptr = head;
    cJSON *json_response = cJSON_CreateArray();
    while (ptr != NULL)
    {
        cJSON *json_firewall_rule = cJSON_CreateObject();
        prepare_firewall_json(json_firewall_rule, ptr);
        cJSON_AddItemToArray(json_response, json_firewall_rule);
        ptr = ptr->next;
    }
    this->firewall_api->send(200, "application/json", cJSON_Print(json_response));
}

void ESPFirewall::handle_clients()
{
    this->firewall_api->handleClient();
}