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package org.netbeans.validation.api.builtin.stringvalidation;

import org.netbeans.validation.api.Problems;
import org.netbeans.validation.api.Validator;
import org.openide.util.NbBundle;

/**
 *
 * @author Tim Boudreau
 */
final class HostNameValidator extends StringValidator {

    private final boolean allowPort;

    HostNameValidator(boolean allowPort) {
        this.allowPort = allowPort;
    }

    @Override
    public void validate(Problems problems, String compName, String model) {
        if (model.length() == 0) {
            problems.add(NbBundle.getMessage(HostNameValidator.class,
                    "INVALID_HOST_NAME", compName, model)); //NOI18N
            return;
        }
        if (model.startsWith(".") || model.endsWith(".")) { //NOI18N
            problems.add(NbBundle.getMessage(IpAddressValidator.class,
                "HOST_STARTS_OR_ENDS_WITH_PERIOD", model)); //NOI18N
            return;
        }
        String[] parts = model.split("\\.");
        if (parts.length > 4) {
            problems.add(NbBundle.getMessage(IpAddressValidator.class,
                "TOO_MANY_LABELS", model)); //NOI18N
            return;
        }
        if (!allowPort && model.contains(":")) { //NOI18N
            problems.add(NbBundle.getMessage(HostNameValidator.class,
                    "MSG_PORT_NOT_ALLOWED", compName, model)); //NOI18N
            return;
        }
        new MayNotContainSpacesValidator().validate(problems, compName, model);
        if (model.endsWith("-") || model.startsWith("-")) {
            problems.add(NbBundle.getMessage(HostNameValidator.class,
                    "INVALID_HOST_NAME", compName, model)); //NOI18N
            return;
        }

        for (int i = 0; i < parts.length; i++) {
            String label = parts[i];
            if (label.length() > 63) {
                problems.add(NbBundle.getMessage(HostNameValidator.class,
                        "LABEL_TOO_LONG", label)); //NOI18N
                return;
            }
            if (i == parts.length - 1 && label.indexOf(":") > 0) {
                String[] labelAndPort = label.split(":");
                if (labelAndPort.length > 2) {
                    problems.add(NbBundle.getMessage(HostNameValidator.class,
                            "INVALID_PORT", compName, label)); //NOI18N
                    return;
                }
                if (labelAndPort.length == 1) {
                    problems.add(NbBundle.getMessage(HostNameValidator.class,
                            "INVALID_PORT", compName, "''")); //NOI18N
                    return;
                } 
                if (label.endsWith(":")) {
                    problems.add(NbBundle.getMessage(HostNameValidator.class,
                            "TOO_MANY_COLONS", compName, label)); //NOI18N
                    return;
                }
                try {
                    int port = Integer.parseInt(labelAndPort[1]);
                    if (port < 0) {
                        problems.add(NbBundle.getMessage(IpAddressValidator.class,
                                "NEGATIVE_PORT", port)); //NOI18N
                        return;
                    } else if (port >= 65536) {
                        problems.add(NbBundle.getMessage(IpAddressValidator.class,
                                "PORT_TOO_HIGH", port)); //NOI18N
                        return;
                    }
                } catch (NumberFormatException e) {
                    problems.add(NbBundle.getMessage(HostNameValidator.class,
                            "INVALID_PORT", compName, labelAndPort[1])); //NOI18N
                    return;
                }
                if(!checkHostPart(labelAndPort[0], problems, compName)){
                    return;
                }
            } else {
                checkHostPart(label, problems, compName);
            }
        } // for
    }

    private boolean checkHostPart(String label, Problems problems, String compName) {
        if (label.length() > 63) {
            problems.add(NbBundle.getMessage(HostNameValidator.class,
                    "LABEL_TOO_LONG", label)); //NOI18N
            return false;
        }
        if (label.length() == 0) {
            problems.add(NbBundle.getMessage(HostNameValidator.class,
                    "LABEL_EMPTY", compName, label)); //NOI18N
            return false;
        }
        try {
            Integer.parseInt(label);
            problems.add(NbBundle.getMessage(HostNameValidator.class,
                    "NUMBER_PART_IN_HOSTNAME", label)); //NOI18N
            return false;
        } catch (NumberFormatException e) {
            //do nothing
        }
        Problems tmp = new Problems();
        new EncodableInCharsetValidator().validate(tmp, compName, label);
        problems.putAll(tmp);
        if (!tmp.hasFatal()) {
            for (char c : label.toLowerCase().toCharArray()) {
                if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9' || c == '-')) { //NOI18N
                    continue;
                }
                problems.add(NbBundle.getMessage(HostNameValidator.class,
                        "BAD_CHAR_IN_HOSTNAME", new String(new char[]{c}))); //NOI18N
                return false;
            }
        }
        return true;
    }
}