/*
 * This file is part of the WebKit project.
 *
 * Copyright (C) 2009 Michelangelo De Simone <micdesim@gmail.com>
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2018 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "EmailInputType.h"

#include "HTMLInputElement.h"
#include "HTMLParserIdioms.h"
#include "InputTypeNames.h"
#include "LocalizedStrings.h"
#include <JavaScriptCore/RegularExpression.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringBuilder.h>

namespace WebCore {

// From https://html.spec.whatwg.org/#valid-e-mail-address.
static const char emailPattern[] = "^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$";

static bool isValidEmailAddress(const String& address)
{
    int addressLength = address.length();
    if (!addressLength)
        return false;

    static NeverDestroyed<const JSC::Yarr::RegularExpression> regExp(emailPattern, JSC::Yarr::TextCaseInsensitive);

    int matchLength;
    int matchOffset = regExp.get().match(address, 0, &matchLength);

    return !matchOffset && matchLength == addressLength;
}

const AtomString& EmailInputType::formControlType() const
{
    return InputTypeNames::email();
}

bool EmailInputType::typeMismatchFor(const String& value) const
{
    ASSERT(element());
    if (value.isEmpty())
        return false;
    if (!element()->multiple())
        return !isValidEmailAddress(value);
    for (auto& address : value.splitAllowingEmptyEntries(',')) {
        if (!isValidEmailAddress(stripLeadingAndTrailingHTMLSpaces(address)))
            return true;
    }
    return false;
}

bool EmailInputType::typeMismatch() const
{
    ASSERT(element());
    return typeMismatchFor(element()->value());
}

String EmailInputType::typeMismatchText() const
{
    ASSERT(element());
    return element()->multiple() ? validationMessageTypeMismatchForMultipleEmailText() : validationMessageTypeMismatchForEmailText();
}

bool EmailInputType::supportsSelectionAPI() const
{
    return false;
}

String EmailInputType::sanitizeValue(const String& proposedValue) const
{
    String noLineBreakValue = proposedValue.removeCharacters(isHTMLLineBreak);
    ASSERT(element());
    if (!element()->multiple())
        return stripLeadingAndTrailingHTMLSpaces(noLineBreakValue);
    Vector<String> addresses = noLineBreakValue.splitAllowingEmptyEntries(',');
    StringBuilder strippedValue;
    for (unsigned i = 0; i < addresses.size(); ++i) {
        if (i > 0)
            strippedValue.append(',');
        strippedValue.append(stripLeadingAndTrailingHTMLSpaces(addresses[i]));
    }
    return strippedValue.toString();
}

} // namespace WebCore