/*
 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "ClipboardUtilitiesWin.h"

#include "DocumentFragment.h"
#include "KURL.h"
#include "PlatformString.h"
#include "TextEncoding.h"
#include "markup.h"
#include <shlwapi.h>
#include <wininet.h> // for INTERNET_MAX_URL_LENGTH
#include <wtf/StringExtras.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringConcatenate.h>

#if PLATFORM(CF)
#include <CoreFoundation/CoreFoundation.h>
#include <wtf/RetainPtr.h>
#endif

namespace WebCore {

#if PLATFORM(CF)
FORMATETC* cfHDropFormat()
{
    static FORMATETC urlFormat = {CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &urlFormat;
}

static bool urlFromPath(CFStringRef path, String& url)
{
    if (!path)
        return false;

    RetainPtr<CFURLRef> cfURL(AdoptCF, CFURLCreateWithFileSystemPath(0, path, kCFURLWindowsPathStyle, false));
    if (!cfURL)
        return false;

    url = CFURLGetString(cfURL.get());

    // Work around <rdar://problem/6708300>, where CFURLCreateWithFileSystemPath makes URLs with "localhost".
    if (url.startsWith("file://localhost/"))
        url.remove(7, 9);

    return true;
}
#endif

static bool getWebLocData(IDataObject* dataObject, String& url, String* title) 
{
    bool succeeded = false;
#if PLATFORM(CF)
    WCHAR filename[MAX_PATH];
    WCHAR urlBuffer[INTERNET_MAX_URL_LENGTH];

    STGMEDIUM medium;
    if (FAILED(dataObject->GetData(cfHDropFormat(), &medium)))
        return false;

    HDROP hdrop = static_cast<HDROP>(GlobalLock(medium.hGlobal));

    if (!hdrop)
        return false;

    if (!DragQueryFileW(hdrop, 0, filename, WTF_ARRAY_LENGTH(filename)))
        goto exit;

    if (_wcsicmp(PathFindExtensionW(filename), L".url"))
        goto exit;    
    
    if (!GetPrivateProfileStringW(L"InternetShortcut", L"url", 0, urlBuffer, WTF_ARRAY_LENGTH(urlBuffer), filename))
        goto exit;
    
    if (title) {
        PathRemoveExtension(filename);
        *title = String((UChar*)filename);
    }
    
    url = String((UChar*)urlBuffer);
    succeeded = true;

exit:
    // Free up memory.
    DragFinish(hdrop);
    GlobalUnlock(medium.hGlobal);
#endif
    return succeeded;
}

static String extractURL(const String &inURL, String* title)
{
    String url = inURL;
    int splitLoc = url.find('\n');
    if (splitLoc > 0) {
        if (title)
            *title = url.substring(splitLoc+1);
        url.truncate(splitLoc);
    } else if (title)
        *title = url;
    return url;
}

// Firefox text/html
static FORMATETC* texthtmlFormat() 
{
    static UINT cf = RegisterClipboardFormat(L"text/html");
    static FORMATETC texthtmlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &texthtmlFormat;
}

HGLOBAL createGlobalData(const KURL& url, const String& title)
{
    String mutableURL(url.string());
    String mutableTitle(title);
    SIZE_T size = mutableURL.length() + mutableTitle.length() + 2; // +1 for "\n" and +1 for null terminator
    HGLOBAL cbData = ::GlobalAlloc(GPTR, size * sizeof(UChar));

    if (cbData) {
        PWSTR buffer = static_cast<PWSTR>(GlobalLock(cbData));
        _snwprintf(buffer, size, L"%s\n%s", mutableURL.charactersWithNullTermination(), mutableTitle.charactersWithNullTermination());
        GlobalUnlock(cbData);
    }
    return cbData;
}

HGLOBAL createGlobalData(const String& str)
{
    HGLOBAL globalData = ::GlobalAlloc(GPTR, (str.length() + 1) * sizeof(UChar));
    if (!globalData)
        return 0;
    UChar* buffer = static_cast<UChar*>(GlobalLock(globalData));
    memcpy(buffer, str.characters(), str.length() * sizeof(UChar));
    buffer[str.length()] = 0;
    GlobalUnlock(globalData);
    return globalData;
}

HGLOBAL createGlobalData(const Vector<char>& vector)
{
    HGLOBAL globalData = ::GlobalAlloc(GPTR, vector.size() + 1);
    if (!globalData)
        return 0;
    char* buffer = static_cast<char*>(GlobalLock(globalData));
    memcpy(buffer, vector.data(), vector.size());
    buffer[vector.size()] = 0;
    GlobalUnlock(globalData);
    return globalData;
}

static String getFullCFHTML(IDataObject* data, bool& success)
{
    STGMEDIUM store;
    if (SUCCEEDED(data->GetData(htmlFormat(), &store))) {
        // MS HTML Format parsing
        char* data = static_cast<char*>(GlobalLock(store.hGlobal));
        SIZE_T dataSize = ::GlobalSize(store.hGlobal);
        String cfhtml(UTF8Encoding().decode(data, dataSize));
        GlobalUnlock(store.hGlobal);
        ReleaseStgMedium(&store);
        success = true;
        return cfhtml;
    }
    success = false;
    return String();
}

static void append(Vector<char>& vector, const char* string)
{
    vector.append(string, strlen(string));
}

static void append(Vector<char>& vector, const CString& string)
{
    vector.append(string.data(), string.length());
}

// Find the markup between "<!--StartFragment -->" and "<!--EndFragment -->", accounting for browser quirks.
static String extractMarkupFromCFHTML(const String& cfhtml)
{
    unsigned markupStart = cfhtml.find("<html", 0, false);
    unsigned tagStart = cfhtml.find("startfragment", markupStart, false);
    unsigned fragmentStart = cfhtml.find('>', tagStart) + 1;
    unsigned tagEnd = cfhtml.find("endfragment", fragmentStart, false);
    unsigned fragmentEnd = cfhtml.reverseFind('<', tagEnd);
    return cfhtml.substring(fragmentStart, fragmentEnd - fragmentStart).stripWhiteSpace();
}

// Documentation for the CF_HTML format is available at http://msdn.microsoft.com/workshop/networking/clipboard/htmlclipboard.asp
void markupToCFHTML(const String& markup, const String& srcURL, Vector<char>& result)
{
    if (markup.isEmpty())
        return;

    #define MAX_DIGITS 10
    #define MAKE_NUMBER_FORMAT_1(digits) MAKE_NUMBER_FORMAT_2(digits)
    #define MAKE_NUMBER_FORMAT_2(digits) "%0" #digits "u"
    #define NUMBER_FORMAT MAKE_NUMBER_FORMAT_1(MAX_DIGITS)

    const char* header = "Version:0.9\n"
        "StartHTML:" NUMBER_FORMAT "\n"
        "EndHTML:" NUMBER_FORMAT "\n"
        "StartFragment:" NUMBER_FORMAT "\n"
        "EndFragment:" NUMBER_FORMAT "\n";
    const char* sourceURLPrefix = "SourceURL:";

    const char* startMarkup = "<HTML>\n<BODY>\n<!--StartFragment-->\n";
    const char* endMarkup = "\n<!--EndFragment-->\n</BODY>\n</HTML>";

    CString sourceURLUTF8 = srcURL == blankURL() ? "" : srcURL.utf8();
    CString markupUTF8 = markup.utf8();

    // calculate offsets
    unsigned startHTMLOffset = strlen(header) - strlen(NUMBER_FORMAT) * 4 + MAX_DIGITS * 4;
    if (sourceURLUTF8.length())
        startHTMLOffset += strlen(sourceURLPrefix) + sourceURLUTF8.length() + 1;
    unsigned startFragmentOffset = startHTMLOffset + strlen(startMarkup);
    unsigned endFragmentOffset = startFragmentOffset + markupUTF8.length();
    unsigned endHTMLOffset = endFragmentOffset + strlen(endMarkup);

    unsigned headerBufferLength = startHTMLOffset + 1; // + 1 for '\0' terminator.
    char* headerBuffer = (char*)malloc(headerBufferLength);
    snprintf(headerBuffer, headerBufferLength, header, startHTMLOffset, endHTMLOffset, startFragmentOffset, endFragmentOffset);
    append(result, CString(headerBuffer));
    free(headerBuffer);
    if (sourceURLUTF8.length()) {
        append(result, sourceURLPrefix);
        append(result, sourceURLUTF8);
        result.append('\n');
    }
    append(result, startMarkup);
    append(result, markupUTF8);
    append(result, endMarkup);

    #undef MAX_DIGITS
    #undef MAKE_NUMBER_FORMAT_1
    #undef MAKE_NUMBER_FORMAT_2
    #undef NUMBER_FORMAT
}

void replaceNewlinesWithWindowsStyleNewlines(String& str)
{
    static const UChar Newline = '\n';
    static const char* const WindowsNewline("\r\n");
    str.replace(Newline, WindowsNewline);
}

void replaceNBSPWithSpace(String& str)
{
    static const UChar NonBreakingSpaceCharacter = 0xA0;
    static const UChar SpaceCharacter = ' ';
    str.replace(NonBreakingSpaceCharacter, SpaceCharacter);
}

FORMATETC* urlWFormat()
{
    static UINT cf = RegisterClipboardFormat(L"UniformResourceLocatorW");
    static FORMATETC urlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &urlFormat;
}

FORMATETC* urlFormat()
{
    static UINT cf = RegisterClipboardFormat(L"UniformResourceLocator");
    static FORMATETC urlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &urlFormat;
}

FORMATETC* plainTextFormat()
{
    static FORMATETC textFormat = {CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &textFormat;
}

FORMATETC* plainTextWFormat()
{
    static FORMATETC textFormat = {CF_UNICODETEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &textFormat;
}

FORMATETC* filenameWFormat()
{
    static UINT cf = RegisterClipboardFormat(L"FileNameW");
    static FORMATETC urlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &urlFormat;
}

FORMATETC* filenameFormat()
{
    static UINT cf = RegisterClipboardFormat(L"FileName");
    static FORMATETC urlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &urlFormat;
}

// MSIE HTML Format
FORMATETC* htmlFormat() 
{
    static UINT cf = RegisterClipboardFormat(L"HTML Format");
    static FORMATETC htmlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &htmlFormat;
}

FORMATETC* smartPasteFormat()
{
    static UINT cf = RegisterClipboardFormat(L"WebKit Smart Paste Format");
    static FORMATETC htmlFormat = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
    return &htmlFormat;
}

String getURL(IDataObject* dataObject, DragData::FilenameConversionPolicy filenamePolicy, bool& success, String* title)
{
    STGMEDIUM store;
    String url;
    success = false;
    if (getWebLocData(dataObject, url, title))
        success = true;
    else if (SUCCEEDED(dataObject->GetData(urlWFormat(), &store))) {
        // URL using Unicode
        UChar* data = static_cast<UChar*>(GlobalLock(store.hGlobal));
        url = extractURL(String(data), title);
        GlobalUnlock(store.hGlobal);
        ReleaseStgMedium(&store);
        success = true;
    } else if (SUCCEEDED(dataObject->GetData(urlFormat(), &store))) {
        // URL using ASCII
        char* data = static_cast<char*>(GlobalLock(store.hGlobal));
        url = extractURL(String(data), title);
        GlobalUnlock(store.hGlobal);
        ReleaseStgMedium(&store);
        success = true;
    }
#if PLATFORM(CF)
    else if (filenamePolicy == DragData::ConvertFilenames) {
        if (SUCCEEDED(dataObject->GetData(filenameWFormat(), &store))) {
            // file using unicode
            wchar_t* data = static_cast<wchar_t*>(GlobalLock(store.hGlobal));
            if (data && data[0] && (PathFileExists(data) || PathIsUNC(data))) {
                RetainPtr<CFStringRef> pathAsCFString(AdoptCF, CFStringCreateWithCharacters(kCFAllocatorDefault, (const UniChar*)data, wcslen(data)));
                if (urlFromPath(pathAsCFString.get(), url)) {
                    if (title)
                        *title = url;
                    success = true;
                }
            }
            GlobalUnlock(store.hGlobal);
            ReleaseStgMedium(&store);
        } else if (SUCCEEDED(dataObject->GetData(filenameFormat(), &store))) {
            // filename using ascii
            char* data = static_cast<char*>(GlobalLock(store.hGlobal));
            if (data && data[0] && (PathFileExistsA(data) || PathIsUNCA(data))) {
                RetainPtr<CFStringRef> pathAsCFString(AdoptCF, CFStringCreateWithCString(kCFAllocatorDefault, data, kCFStringEncodingASCII));
                if (urlFromPath(pathAsCFString.get(), url)) {
                    if (title)
                        *title = url;
                    success = true;
                }
            }
            GlobalUnlock(store.hGlobal);
            ReleaseStgMedium(&store);
        }
    }
#endif
    return url;
}

String getPlainText(IDataObject* dataObject, bool& success)
{
    STGMEDIUM store;
    String text;
    success = false;
    if (SUCCEEDED(dataObject->GetData(plainTextWFormat(), &store))) {
        // Unicode text
        UChar* data = static_cast<UChar*>(GlobalLock(store.hGlobal));
        text = String(data);
        GlobalUnlock(store.hGlobal);
        ReleaseStgMedium(&store);
        success = true;
    } else if (SUCCEEDED(dataObject->GetData(plainTextFormat(), &store))) {
        // ASCII text
        char* data = static_cast<char*>(GlobalLock(store.hGlobal));
        text = String(data);
        GlobalUnlock(store.hGlobal);
        ReleaseStgMedium(&store);
        success = true;
    } else {
        // FIXME: Originally, we called getURL() here because dragging and dropping files doesn't
        // populate the drag with text data. Per https://bugs.webkit.org/show_bug.cgi?id=38826, this
        // is undesirable, so maybe this line can be removed.
        text = getURL(dataObject, DragData::DoNotConvertFilenames, success);
        success = true;
    }
    return text;
}

String getTextHTML(IDataObject* data, bool& success)
{
    STGMEDIUM store;
    String html;
    success = false;
    if (SUCCEEDED(data->GetData(texthtmlFormat(), &store))) {
        UChar* data = static_cast<UChar*>(GlobalLock(store.hGlobal));
        html = String(data);
        GlobalUnlock(store.hGlobal);
        ReleaseStgMedium(&store);
        success = true;
    }
    return html;
}

String getCFHTML(IDataObject* data, bool& success)
{
    String cfhtml = getFullCFHTML(data, success);
    if (success)
        return extractMarkupFromCFHTML(cfhtml);
    return String();
}

PassRefPtr<DocumentFragment> fragmentFromFilenames(Document*, const IDataObject*)
{
    // FIXME: We should be able to create fragments from files
    return 0;
}

bool containsFilenames(const IDataObject*)
{
    // FIXME: We'll want to update this once we can produce fragments from files
    return false;
}

// Convert a String containing CF_HTML formatted text to a DocumentFragment
PassRefPtr<DocumentFragment> fragmentFromCFHTML(Document* doc, const String& cfhtml)
{
    // obtain baseURL if present
    String srcURLStr("sourceURL:");
    String srcURL;
    unsigned lineStart = cfhtml.find(srcURLStr, 0, false);
    if (lineStart != -1) {
        unsigned srcEnd = cfhtml.find("\n", lineStart, false);
        unsigned srcStart = lineStart+srcURLStr.length();
        String rawSrcURL = cfhtml.substring(srcStart, srcEnd-srcStart);
        replaceNBSPWithSpace(rawSrcURL);
        srcURL = rawSrcURL.stripWhiteSpace();
    }

    String markup = extractMarkupFromCFHTML(cfhtml);
    return createFragmentFromMarkup(doc, markup, srcURL, FragmentScriptingNotAllowed);
}

PassRefPtr<DocumentFragment> fragmentFromHTML(Document* doc, IDataObject* data) 
{
    if (!doc || !data)
        return 0;

    bool success = false;
    String cfhtml = getFullCFHTML(data, success);
    if (success) {
        if (PassRefPtr<DocumentFragment> fragment = fragmentFromCFHTML(doc, cfhtml))
            return fragment;
    }

    String html = getTextHTML(data, success);
    String srcURL;
    if (success)
        return createFragmentFromMarkup(doc, html, srcURL, FragmentScriptingNotAllowed);

    return 0;
}

bool containsHTML(IDataObject* data)
{
    return SUCCEEDED(data->QueryGetData(texthtmlFormat())) || SUCCEEDED(data->QueryGetData(htmlFormat()));
}

} // namespace WebCore