#include <stdexcept>
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <set>
#include "TGClient.h"
#include "TGHtml.h"
#include "TGButton.h"
#include "TGMenu.h"
#include "TGLabel.h"
#include "TGTextEntry.h"
#include "TPluginManager.h"
#include "TUrl.h"
#include "TSocket.h"
#include "TSystem.h"
#include "TVirtualX.h"
#include "TPRegexp.h"
#include "TVirtualX.h"
#include "Fireworks/Core/interface/CmsShowSearchFiles.h"
#include "Fireworks/Core/interface/fwLog.h"
#include "Fireworks/Core/interface/fwPaths.h"

class FWHtml : public TGHtml {
public:
  FWHtml(const TGWindow* p, int w, int h, int id = -1) : TGHtml(p, w, h, id) {}

  int IsVisited(const char* iCheck) override {
    std::string check(GetBaseUri());
    check += iCheck;
    int value = m_visited.find(check) == m_visited.end() ? kFALSE : kTRUE;
    return value;
  }
  void addToVisited(const char* iToVisit) { m_visited.insert(iToVisit); }

private:
  std::set<std::string> m_visited;
};

const static unsigned int s_columns = 3;
const static char* const s_prefixes[][s_columns] = {{"http://", "Web site known by you", nullptr},
                                                    {"file:", "Local file [you must type full path name]", nullptr},
                                                    {"dcap://", "dCache [FNAL]", nullptr},
                                                    {"rfio://", "Castor [CERN]", nullptr}

};

static const std::string s_httpPrefix("http:");
static const std::string s_filePrefix("file:");
static const std::string s_rootPostfix(".root");

CmsShowSearchFiles::CmsShowSearchFiles(
    const char* filename, const char* windowname, const TGWindow* p, UInt_t w, UInt_t h)
    : TGTransientFrame(gClient->GetDefaultRoot(), p, w, h) {
  TGVerticalFrame* vf = new TGVerticalFrame(this);
  this->AddFrame(vf, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 5, 5, 5, 5));
  TGHorizontalFrame* urlFrame = new TGHorizontalFrame(this);
  vf->AddFrame(urlFrame, new TGLayoutHints(kLHintsExpandX, 5, 0, 5, 5));

  TGLabel* urlLabel = new TGLabel(urlFrame, "URL");
  urlFrame->AddFrame(urlLabel, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 1, 1, 1, 1));
  m_choosePrefix = new TGTextButton(urlFrame, "Choose Prefix");
  urlFrame->AddFrame(m_choosePrefix, new TGLayoutHints(kLHintsLeft, 1, 1, 1, 1));

  m_file = new TGTextEntry(urlFrame);
  urlFrame->AddFrame(m_file, new TGLayoutHints(kLHintsExpandX, 1, 0, 1, 1));
  m_file->Connect("TextChanged(const char*)", "CmsShowSearchFiles", this, "fileEntryChanged(const char*)");
  m_file->Connect("ReturnPressed()", "CmsShowSearchFiles", this, "updateBrowser()");

  m_webFile = new FWHtml(vf, 1, 1);
  m_webFile->Connect("MouseDown(const char*)", "CmsShowSearchFiles", this, "hyperlinkClicked(const char*)");
  vf->AddFrame(m_webFile, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 1, 1, 1, 1));

  TGHorizontalFrame* buttonFrame = new TGHorizontalFrame(vf);
  vf->AddFrame(buttonFrame, new TGLayoutHints(kLHintsExpandX, 1, 10, 1, 10));

  m_openButton = new TGTextButton(buttonFrame, "Open");
  buttonFrame->AddFrame(m_openButton, new TGLayoutHints(kLHintsRight, 5, 5, 1, 1));
  m_openButton->SetEnabled(kFALSE);
  m_openButton->Connect("Clicked()", "CmsShowSearchFiles", this, "openClicked()");

  TGTextButton* cancel = new TGTextButton(buttonFrame, "Cancel");
  buttonFrame->AddFrame(cancel, new TGLayoutHints(kLHintsRight, 5, 5, 1, 1));
  cancel->Connect("Clicked()", "CmsShowSearchFiles", this, "UnmapWindow()");

  SetWindowName(windowname);

  std::string path =
      Form("http://cmsshow-rels.web.cern.ch/cmsShow-rels/samples/%d/", fireworks::supportedDataFormatsVersion()[0]);

  if (!path.empty())
    fwLog(fwlog::kInfo) << "Search files at " << path << "." << std::endl;

  sendToWebBrowser(path);

  MapSubwindows();
  Layout();
  m_prefixMenu = nullptr;
  m_choosePrefix->Connect("Clicked()", "CmsShowSearchFiles", this, "showPrefixes()");
}

CmsShowSearchFiles::~CmsShowSearchFiles() { delete m_prefixMenu; }

//______________________________________________________________________________

void CmsShowSearchFiles::prefixChoosen(Int_t iIndex) {
  //   printf ("pref chosen %d \n", iIndex);
  m_file->SetText(m_prefixes[iIndex].c_str(), kFALSE);
  m_openButton->SetEnabled(kFALSE);

  if (m_prefixComplete[iIndex]) {
    //gClient->NeedRedraw(this);
    gClient->NeedRedraw(m_choosePrefix);
    gClient->NeedRedraw(m_webFile);
    gClient->ProcessEventsFor(this);
    updateBrowser();
  } else {
    std::string p;
    sendToWebBrowser(p);
  }
}

//______________________________________________________________________________

void CmsShowSearchFiles::fileEntryChanged(const char* iFileName) {
  std::string fileName = iFileName;
  size_t index = fileName.find_last_of('.');
  std::string postfix;
  if (index != std::string::npos) {
    postfix = fileName.substr(index, std::string::npos);
  }
  if (postfix == s_rootPostfix) {
    m_openButton->SetEnabled(kTRUE);
  } else {
    m_openButton->SetEnabled(kFALSE);
  }
}

//______________________________________________________________________________

void CmsShowSearchFiles::updateBrowser() {
  std::string n = m_file->GetText();
  sendToWebBrowser(n);
}

//______________________________________________________________________________

void CmsShowSearchFiles::hyperlinkClicked(const char* iLink) {
  m_file->SetText(iLink, kTRUE);

  m_webFile->addToVisited(iLink);
  std::string fileName = iLink;
  size_t index = fileName.find_last_of('.');
  std::string postfix = fileName.substr(index, std::string::npos);

  if (postfix != s_rootPostfix) {
    updateBrowser();
  } else {
    openClicked();
  }
}

//______________________________________________________________________________

void CmsShowSearchFiles::openClicked() {
  m_openCalled = true;
  this->UnmapWindow();
}

//______________________________________________________________________________

void CmsShowSearchFiles::showPrefixes() {
  if (nullptr == m_prefixMenu) {
    m_prefixMenu = new TGPopupMenu(this);
    const char* const(*itEnd)[s_columns] = s_prefixes + sizeof(s_prefixes) / sizeof(const char* [3]);
    int index = 0;
    for (const char* const(*it)[s_columns] = s_prefixes; it != itEnd; ++it, ++index) {
      //only add the protocols this version of the code actually can load
      std::string prefix = std::string((*it)[0]).substr(0, std::string((*it)[0]).find_first_of(':') + 1);
      if (s_httpPrefix == prefix || s_filePrefix == prefix ||
          (gPluginMgr->FindHandler("TSystem", prefix.c_str()) &&
           gPluginMgr->FindHandler("TSystem", prefix.c_str())->CheckPlugin() != -1)) {
        m_prefixMenu->AddEntry((std::string((*it)[0]) + " (" + ((*it)[1]) + ")").c_str(), index);
        m_prefixes.push_back((*it)[0]);
        m_prefixComplete.push_back(nullptr != (*it)[2]);
      }
    }
    m_prefixMenu->Connect("Activated(Int_t)", "CmsShowSearchFiles", this, "prefixChoosen(Int_t)");
  }
  m_prefixMenu->PlaceMenu(m_choosePrefix->GetX(), m_choosePrefix->GetY(), true, true);
}

//______________________________________________________________________________

//Copied from TGHtmlBrowser
static std::string readRemote(const char* url) {
  // Read (open) remote files.

  char* buf = nullptr;
  TUrl fUrl(url);

  TString msg = "GET ";
  msg += fUrl.GetProtocol();
  msg += "://";
  msg += fUrl.GetHost();
  msg += ":";
  msg += fUrl.GetPort();
  msg += "/";
  msg += fUrl.GetFile();
  msg += "\r\n";

  TString uri(url);
  if (!uri.BeginsWith("http://"))
    return std::string();
  TSocket s(fUrl.GetHost(), fUrl.GetPort());
  if (!s.IsValid())
    return std::string();
  if (s.SendRaw(msg.Data(), msg.Length()) == -1)
    return std::string();
  Int_t size = 1024 * 1024;
  buf = (char*)calloc(size, sizeof(char));
  if (s.RecvRaw(buf, size) == -1) {
    free(buf);
    return std::string();
  }
  std::string returnValue(buf);
  free(buf);
  return returnValue;
}

//______________________________________________________________________________

void CmsShowSearchFiles::sendToWebBrowser(std::string& fileName) {
  //  std::cout << "CmsShowSearchFiles::sendToWebBrowser " <<  fileName << std::endl ;

  size_t index = fileName.find_first_of(':');
  if (index != std::string::npos) {
    ++index;
  } else {
    index = 0;
  }
  std::string prefix = fileName.substr(0, index);

  m_webFile->Clear();
  if (prefix == s_httpPrefix) {
    gVirtualX->SetCursor(GetId(), gVirtualX->CreateCursor(kWatch));
    //If you clicked a hyperlink then the cursor is still a hand but we now
    // want it to be a watch
    gVirtualX->SetCursor(m_webFile->GetId(), gVirtualX->CreateCursor(kWatch));
    //If we don't call ProcessEventsFor then the cursor will not be updated
    gClient->ProcessEventsFor(this);
    TUrl url(fileName.c_str());
    std::string buffer = readRemote(url.GetUrl());

    if (!buffer.empty()) {
      m_webFile->SetBaseUri(url.GetUrl());
      m_webFile->ParseText(const_cast<char*>(buffer.c_str()));
    } else {
      readError();
    }
    gVirtualX->SetCursor(GetId(), gVirtualX->CreateCursor(kPointer));
    gVirtualX->SetCursor(m_webFile->GetId(), gVirtualX->CreateCursor(kPointer));
  } else {
    readInfo();
  }
  m_webFile->Layout();
}

//______________________________________________________________________________
void CmsShowSearchFiles::readError() {
  const static char* s_readError[] = {
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" "
      "\"http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd\"> ",
      "<HTML><HEAD><TITLE>HTTP Read Error</TITLE> ",
      "<META http-equiv=Content-Type content=\"text/html; charset=UTF-8\"></HEAD> ",
      "<BODY> ",
      "<P>Unknown error while trying to get file via http</P>",
      "</BODY></HTML> ",
      nullptr};

  m_webFile->SetBaseUri("");
  for (int i = 0; s_readError[i]; i++) {
    m_webFile->ParseText(const_cast<char*>(s_readError[i]));
  }
}

void CmsShowSearchFiles::readInfo() {
  const static char* s_noBrowserMessage[] = {
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" "
      "\"http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd\"> ",
      "<HTML><HEAD><TITLE>No Browser Available</TITLE> ",
      "<META http-equiv=Content-Type content=\"text/html; charset=UTF-8\"></HEAD> ",
      "<BODY> ",
      //"No file browser is available for this prefix.  You can still type the full URL into the above text box to open the EDM ROOT file.<BR>",
      //"Only a prefix beginning in <STRONG>http:</STRONG> which contains a site name (e.g. http://www.site.org) is supported for browsing."
      "<b>Welcome....</b><BR>",
      "<BR>",
      "<b>You may look at examples:</b><BR>",
      "If you are in Europe, open example data files at CERN :  ",
      " <a href=",
      Form("http://fireworks.web.cern.ch/fireworks/%d/", fireworks::supportedDataFormatsVersion()[0]),
      "> http://fireworks.web.cern.ch/fireworks/ </a><BR>",
      "If you are in US, open example data files at UCSD:  ",
      " <a href=",
      Form("http://uaf-2.t2.ucsd.edu/fireworks/%d/", fireworks::supportedDataFormatsVersion()[0]),
      ">http://uaf-2.t2.ucsd.edu/fireworks/ </a><BR>",
      "<BR>"
      "<b>You also may load files with Choose Prefix </b><BR>"
      "</BODY></HTML> ",
      nullptr};

  m_webFile->SetBaseUri("");
  for (int i = 0; s_noBrowserMessage[i]; i++) {
    m_webFile->ParseText((char*)s_noBrowserMessage[i]);
  }
}
//______________________________________________________________________________

std::string CmsShowSearchFiles::chooseFileFromURL() {
  DontCallClose();
  Connect("CloseWindow()", "CmsShowSearchFiles", this, "UnmapWindow()");
  m_openCalled = false;
  MapWindow();
  gClient->WaitForUnmap(this);

  if (!m_openCalled) {
    return std::string();
  }
  return m_file->GetText();
}