char extension[32] = "xlsx";

// how often to send email? Default once a day at 12:00
int email_send_period = 5;
// should we send notifications to admin?
int notify_admin = 0;
// should we send notifications to manager?
int notify_manager = 0;

// email data
char email_server[128] = "";
char email_login[128] = "";
char email_password[128] = "";
char email_from[128] = "";
int email_template_id = 0;
int email_port = 0;
int email_enabled = 0;
int nice_number_digits = 2;

// web variables
char web_dir[256] = "";
char web_url[256] = "";

char current_date[20] = "";

// user email template
char email_template_subject[1000] = "Invoices";
char email_template_body[9000] = "Invoices are attached";

int get_invoice_settings();
int get_email_data();
int check_if_file_exists(char *number);
int get_email_template();
void update_conflines();
void email_action_log(int user_id, char *email, int status, char *error);
void send_invoices_to_users();
void send_invoices_to_admin();
void send_invoices_to_managers();
void set_timezone(char *timezone);
int check_if_time_is_ok(int hour, int wday, int mday);
void check_invoice_extension();
void get_user_variables(int user_id, char *username, char *first_name, char *last_name, char *full_name, char *balance, char *balance_range_min, char *balance_range_max);
void get_system_variables(char *currency, char *company_email);
void get_invoice_variables(int invoice_id, char *invoice_price, char *invoice_price_with_tax, char *invoice_currency, char *invoice_period_start, char *invoice_period_end);
char *replace_str(char *str, char *orig, char *rep);
void set_email_variables(char *email, char *user_email, int user_id, int invoice_id);
void update_email_send_counter();