/**
 * @file llfloaterhelpbrowser.cpp
 * @brief HTML Help floater - uses embedded web browser control
 *
 * $LicenseInfo:firstyear=2006&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llfloaterhelpbrowser.h"

#include "llfloaterreg.h"
#include "llhttpconstants.h"
#include "llpluginclassmedia.h"
#include "llmediactrl.h"
#include "llviewerwindow.h"
#include "llviewercontrol.h"
#include "llweb.h"
#include "llui.h"

#include "llurlhistory.h"
#include "llviewermedia.h"
#include "llviewerhelp.h"


LLFloaterHelpBrowser::LLFloaterHelpBrowser(const LLSD& key)
    : LLFloater(key)
{
}

bool LLFloaterHelpBrowser::postBuild()
{
    mBrowser = getChild<LLMediaCtrl>("browser");
    mBrowser->addObserver(this);
    mBrowser->setErrorPageURL(gSavedSettings.getString("GenericErrorPageURL"));

    childSetAction("open_browser", onClickOpenWebBrowser, this);

    buildURLHistory();
    return true;
}

void LLFloaterHelpBrowser::buildURLHistory()
{
    // Get all of the entries in the "browser" collection
    LLSD browser_history = LLURLHistory::getURLHistory("browser");

    // initialize URL history in the plugin
    LLPluginClassMedia *plugin = mBrowser->getMediaPlugin();
    if (plugin)
    {
        plugin->initializeUrlHistory(browser_history);
    }
}

void LLFloaterHelpBrowser::onOpen(const LLSD& key)
{
    gSavedSettings.setBOOL("HelpFloaterOpen", true);

    std::string topic = key.asString();
    mBrowser->navigateTo(LLViewerHelp::instance().getURL(topic));
}

//virtual
void LLFloaterHelpBrowser::onClose(bool app_quitting)
{
    if (!app_quitting)
    {
        gSavedSettings.setBOOL("HelpFloaterOpen", false);
    }
    // really really destroy the help browser when it's closed, it'll be recreated.
    destroy(); // really destroy this dialog on closure, it's relatively heavyweight.
}

void LLFloaterHelpBrowser::handleMediaEvent(LLPluginClassMedia* self, EMediaEvent event)
{
    switch (event)
    {
    case MEDIA_EVENT_LOCATION_CHANGED:
        setCurrentURL(self->getLocation());
        break;

    case MEDIA_EVENT_NAVIGATE_BEGIN:
        getChild<LLUICtrl>("status_text")->setValue(getString("loading_text"));
        break;

    case MEDIA_EVENT_NAVIGATE_COMPLETE:
        getChild<LLUICtrl>("status_text")->setValue(getString("done_text"));
        break;

    default:
        break;
    }
}

void LLFloaterHelpBrowser::setCurrentURL(const std::string& url)
{
    mCurrentURL = url;

    // redirects will navigate momentarily to about:blank, don't add to history
    if (mCurrentURL != "about:blank")
    {
        // Serialize url history
        LLURLHistory::removeURL("browser", mCurrentURL);
        LLURLHistory::addURL("browser", mCurrentURL);
    }
}

//static
void LLFloaterHelpBrowser::onClickClose(void* user_data)
{
    LLFloaterHelpBrowser* self = (LLFloaterHelpBrowser*)user_data;

    self->closeFloater();
}

//static
void LLFloaterHelpBrowser::onClickOpenWebBrowser(void* user_data)
{
    LLFloaterHelpBrowser* self = (LLFloaterHelpBrowser*)user_data;

    std::string url = self->mCurrentURL.empty() ?
        self->mBrowser->getHomePageUrl() :
        self->mCurrentURL;
    LLWeb::loadURLExternal(url);
}

void LLFloaterHelpBrowser::openMedia(const std::string& media_url)
{
    // explicitly make the media mime type for this floater since it will
    // only ever display one type of content (Web).
    mBrowser->setHomePageUrl(media_url, HTTP_CONTENT_TEXT_HTML);
    mBrowser->navigateTo(media_url, HTTP_CONTENT_TEXT_HTML);
    setCurrentURL(media_url);
}