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public Device dev;
public Database db;
public static int main(string[] args) {
if(args.length < 2) {
stderr.printf("%s <device>\n", args[0]);
return 1;
}
dev = new Device(args[1], 9600, 8, 1);
db = new Database("shop.db");
while(true) {
string message = dev.receive();
if(interpret((string) message))
dev.blink(10);
}
}
public static bool interpret(string data) {
if(data.has_prefix("USER ")) {
string str_id = data.substring(5);
uint64 id = uint64.parse(str_id);
/* check if data has valid format */
if(data != "USER %llu".printf(id)) {
stdout.printf("ungültige Benutzernummer!\n");
return false;
}
if(db.is_logged_in()) {
stdout.printf("Logout\n");
return db.logout();
} else {
stdout.printf("Login: %llu\n".printf(id));
return db.login(id);
}
} else {
uint64 id = uint64.parse(data);
/* check if data has valid format */
if(data != "%llu".printf(id)) {
stdout.printf("ungültiges Produkt!\n");
return false;
}
if(db.buy(id)) {
stdout.printf("gekaufter Artikel: %s\n", db.get_product_name(id));
return true;
}
return false;
}
}
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