//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Portions of this file are from JUCE.
    Copyright (c) 2013 - Raw Material Software Ltd.
    Please visit http://www.juce.com

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

URL::URL()
{
}

URL::URL (const String& url_)
    : url (url_)
{
    int i = url.indexOfChar ('?');

    if (i >= 0)
    {
        do
        {
            const int nextAmp   = url.indexOfChar (i + 1, '&');
            const int equalsPos = url.indexOfChar (i + 1, '=');

            if (equalsPos > i + 1)
            {
                if (nextAmp < 0)
                {
                    addParameter (removeEscapeChars (url.substring (i + 1, equalsPos)),
                                  removeEscapeChars (url.substring (equalsPos + 1)));
                }
                else if (nextAmp > 0 && equalsPos < nextAmp)
                {
                    addParameter (removeEscapeChars (url.substring (i + 1, equalsPos)),
                                  removeEscapeChars (url.substring (equalsPos + 1, nextAmp)));
                }
            }

            i = nextAmp;
        }
        while (i >= 0);

        url = url.upToFirstOccurrenceOf ("?", false, false);
    }
}

URL::URL (const URL& other)
    : url (other.url),
      postData (other.postData),
      parameterNames (other.parameterNames),
      parameterValues (other.parameterValues),
      filesToUpload (other.filesToUpload),
      mimeTypes (other.mimeTypes)
{
}

URL& URL::operator= (const URL& other)
{
    url = other.url;
    postData = other.postData;
    parameterNames = other.parameterNames;
    parameterValues = other.parameterValues;
    filesToUpload = other.filesToUpload;
    mimeTypes = other.mimeTypes;

    return *this;
}

bool URL::operator== (const URL& other) const
{
    return url == other.url
        && postData == other.postData
        && parameterNames == other.parameterNames
        && parameterValues == other.parameterValues
        && filesToUpload == other.filesToUpload
        && mimeTypes == other.mimeTypes;
}

bool URL::operator!= (const URL& other) const
{
    return ! operator== (other);
}

URL::~URL()
{
}

namespace URLHelpers
{
    static String getMangledParameters (const URL& url)
    {
        bassert (url.getParameterNames().size() == url.getParameterValues().size());
        String p;

        for (int i = 0; i < url.getParameterNames().size(); ++i)
        {
            if (i > 0)
                p << '&';

            p << URL::addEscapeChars (url.getParameterNames()[i], true)
              << '='
              << URL::addEscapeChars (url.getParameterValues()[i], true);
        }

        return p;
    }

    static int findEndOfScheme (const String& url)
    {
        int i = 0;

        while (CharacterFunctions::isLetterOrDigit (url[i])
                || url[i] == '+' || url[i] == '-' || url[i] == '.')
            ++i;

        return url[i] == ':' ? i + 1 : 0;
    }

    static int findStartOfNetLocation (const String& url)
    {
        int start = findEndOfScheme (url);
        while (url[start] == '/')
            ++start;

        return start;
    }

    static int findStartOfPath (const String& url)
    {
        return url.indexOfChar (findStartOfNetLocation (url), '/') + 1;
    }

    static void createHeadersAndPostData (const URL& url, String& headers, MemoryBlock& postData)
    {
        MemoryOutputStream data (postData, false);

        if (url.getFilesToUpload().size() > 0)
        {
            // need to upload some files, so do it as multi-part...
            const String boundary (String::toHexString (Random::getSystemRandom().nextInt64()));

            headers << "Content-Type: multipart/form-data; boundary=" << boundary << "\r\n";

            data << "--" << boundary;

            for (int i = 0; i < url.getParameterNames().size(); ++i)
            {
                data << "\r\nContent-Disposition: form-data; name=\""
                     << url.getParameterNames() [i]
                     << "\"\r\n\r\n"
                     << url.getParameterValues() [i]
                     << "\r\n--"
                     << boundary;
            }

            for (int i = 0; i < url.getFilesToUpload().size(); ++i)
            {
                const File file (url.getFilesToUpload().getAllValues() [i]);
                const String paramName (url.getFilesToUpload().getAllKeys() [i]);

                data << "\r\nContent-Disposition: form-data; name=\"" << paramName
                     << "\"; filename=\"" << file.getFileName() << "\"\r\n";

                const String mimeType (url.getMimeTypesOfUploadFiles()
                                          .getValue (paramName, String::empty));

                if (mimeType.isNotEmpty())
                    data << "Content-Type: " << mimeType << "\r\n";

                data << "Content-Transfer-Encoding: binary\r\n\r\n"
                     << file << "\r\n--" << boundary;
            }

            data << "--\r\n";
        }
        else
        {
            data << getMangledParameters (url)
                 << url.getPostData();

            // just a short text attachment, so use simple url encoding..
            headers << "Content-Type: application/x-www-form-urlencoded\r\nContent-length: "
                    << (int) data.getDataSize() << "\r\n";
        }
    }

    static void concatenatePaths (String& path, const String& suffix)
    {
        if (! path.endsWithChar ('/'))
            path << '/';

        if (suffix.startsWithChar ('/'))
            path += suffix.substring (1);
        else
            path += suffix;
    }
}

void URL::addParameter (const String& name, const String& value)
{
    parameterNames.add (name);
    parameterValues.add (value);
}

String URL::toString (const bool includeGetParameters) const
{
    if (includeGetParameters && parameterNames.size() > 0)
        return url + "?" + URLHelpers::getMangledParameters (*this);

    return url;
}

bool URL::isWellFormed() const
{
    //xxx TODO
    return url.isNotEmpty();
}

String URL::getDomain() const
{
    const int start = URLHelpers::findStartOfNetLocation (url);
    const int end1 = url.indexOfChar (start, '/');
    const int end2 = url.indexOfChar (start, ':');

    const int end = (end1 < 0 && end2 < 0) ? std::numeric_limits<int>::max()
                                           : ((end1 < 0 || end2 < 0) ? bmax (end1, end2)
                                                                     : bmin (end1, end2));
    return url.substring (start, end);
}

String URL::getSubPath() const
{
    const int startOfPath = URLHelpers::findStartOfPath (url);

    return startOfPath <= 0 ? String::empty
                            : url.substring (startOfPath);
}

String URL::getScheme() const
{
    return url.substring (0, URLHelpers::findEndOfScheme (url) - 1);
}

int URL::getPort() const
{
    const int colonPos = url.indexOfChar (URLHelpers::findStartOfNetLocation (url), ':');

    return colonPos > 0 ? url.substring (colonPos + 1).getIntValue() : 0;
}

URL URL::withNewSubPath (const String& newPath) const
{
    const int startOfPath = URLHelpers::findStartOfPath (url);

    URL u (*this);

    if (startOfPath > 0)
        u.url = url.substring (0, startOfPath);

    URLHelpers::concatenatePaths (u.url, newPath);
    return u;
}

URL URL::getChildURL (const String& subPath) const
{
    URL u (*this);
    URLHelpers::concatenatePaths (u.url, subPath);
    return u;
}

//==============================================================================
bool URL::isProbablyAWebsiteURL (const String& possibleURL)
{
    const char* validProtocols[] = { "http:", "ftp:", "https:" };

    for (int i = 0; i < numElementsInArray (validProtocols); ++i)
        if (possibleURL.startsWithIgnoreCase (validProtocols[i]))
            return true;

    if (possibleURL.containsChar ('@')
         || possibleURL.containsChar (' '))
        return false;

    const String topLevelDomain (possibleURL.upToFirstOccurrenceOf ("/", false, false)
                                            .fromLastOccurrenceOf (".", false, false));

    return topLevelDomain.isNotEmpty() && topLevelDomain.length() <= 3;
}

bool URL::isProbablyAnEmailAddress (const String& possibleEmailAddress)
{
    const int atSign = possibleEmailAddress.indexOfChar ('@');

    return atSign > 0
            && possibleEmailAddress.lastIndexOfChar ('.') > (atSign + 1)
            && (! possibleEmailAddress.endsWithChar ('.'));
}

//==============================================================================
InputStream* URL::createInputStream (const bool usePostCommand,
                                     OpenStreamProgressCallback* const progressCallback,
                                     void* const progressCallbackContext,
                                     const String& extraHeaders,
                                     const int timeOutMs,
                                     StringPairArray* const responseHeaders) const
{
    String headers;
    MemoryBlock headersAndPostData;

    if (usePostCommand)
        URLHelpers::createHeadersAndPostData (*this, headers, headersAndPostData);

    headers += extraHeaders;

    if (! headers.endsWithChar ('\n'))
        headers << "\r\n";

    return createNativeStream (toString (! usePostCommand), usePostCommand, headersAndPostData,
                               progressCallback, progressCallbackContext,
                               headers, timeOutMs, responseHeaders);
}

//==============================================================================
bool URL::readEntireBinaryStream (MemoryBlock& destData,
                                  const bool usePostCommand) const
{
    const ScopedPointer <InputStream> in (createInputStream (usePostCommand));

    if (in != nullptr)
    {
        in->readIntoMemoryBlock (destData);
        return true;
    }

    return false;
}

String URL::readEntireTextStream (const bool usePostCommand) const
{
    const ScopedPointer <InputStream> in (createInputStream (usePostCommand));

    if (in != nullptr)
        return in->readEntireStreamAsString();

    return String::empty;
}

XmlElement* URL::readEntireXmlStream (const bool usePostCommand) const
{
    return XmlDocument::parse (readEntireTextStream (usePostCommand));
}

//==============================================================================
URL URL::withParameter (const String& parameterName,
                        const String& parameterValue) const
{
    URL u (*this);
    u.addParameter (parameterName, parameterValue);
    return u;
}

URL URL::withFileToUpload (const String& parameterName,
                           const File& fileToUpload,
                           const String& mimeType) const
{
    bassert (mimeType.isNotEmpty()); // You need to supply a mime type!

    URL u (*this);
    u.filesToUpload.set (parameterName, fileToUpload.getFullPathName());
    u.mimeTypes.set (parameterName, mimeType);
    return u;
}

URL URL::withPOSTData (const String& postData_) const
{
    URL u (*this);
    u.postData = postData_;
    return u;
}

const StringPairArray& URL::getFilesToUpload() const
{
    return filesToUpload;
}

const StringPairArray& URL::getMimeTypesOfUploadFiles() const
{
    return mimeTypes;
}

//==============================================================================
String URL::removeEscapeChars (const String& s)
{
    String result (s.replaceCharacter ('+', ' '));

    if (! result.containsChar ('%'))
        return result;

    // We need to operate on the string as raw UTF8 chars, and then recombine them into unicode
    // after all the replacements have been made, so that multi-byte chars are handled.
    Array<char> utf8 (result.toRawUTF8(), (int) result.getNumBytesAsUTF8());

    for (int i = 0; i < utf8.size(); ++i)
    {
        if (utf8.getUnchecked(i) == '%')
        {
            const int hexDigit1 = CharacterFunctions::getHexDigitValue ((beast_wchar) (uint8) utf8 [i + 1]);
            const int hexDigit2 = CharacterFunctions::getHexDigitValue ((beast_wchar) (uint8) utf8 [i + 2]);

            if (hexDigit1 >= 0 && hexDigit2 >= 0)
            {
                utf8.set (i, (char) ((hexDigit1 << 4) + hexDigit2));
                utf8.removeRange (i + 1, 2);
            }
        }
    }

    return String::fromUTF8 (utf8.getRawDataPointer(), utf8.size());
}

String URL::addEscapeChars (const String& s, const bool isParameter)
{
    const CharPointer_UTF8 legalChars (isParameter ? "_-.*!'()"
                                                   : ",$_-.*!'()");

    Array<char> utf8 (s.toRawUTF8(), (int) s.getNumBytesAsUTF8());

    for (int i = 0; i < utf8.size(); ++i)
    {
        const char c = utf8.getUnchecked(i);

        if (! (CharacterFunctions::isLetterOrDigit (c)
                 || legalChars.indexOf ((beast_wchar) c) >= 0))
        {
            utf8.set (i, '%');
            utf8.insert (++i, "0123456789abcdef" [((uint8) c) >> 4]);
            utf8.insert (++i, "0123456789abcdef" [c & 15]);
        }
    }

    return String::fromUTF8 (utf8.getRawDataPointer(), utf8.size());
}

//==============================================================================
bool URL::launchInDefaultBrowser() const
{
    String u (toString (true));

    if (u.containsChar ('@') && ! u.containsChar (':'))
        u = "mailto:" + u;

    return Process::openDocument (u, String::empty);
}