/* Copyright 2011 Pierre Ossman <ossman@cendio.se> for Cendio AB
 * Copyright 2012 Samuel Mannehed <samuel@cendio.se> for Cendio AB
 * 
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This software 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 * USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <algorithm>
#include <libgen.h>

#include <FL/Fl.H>
#include <FL/Fl_Input.H>
#include <FL/Fl_Input_Choice.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Return_Button.H>
#include <FL/fl_draw.H>
#include <FL/fl_ask.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_File_Chooser.H>

#include <os/os.h>
#include <rfb/Exception.h>
#include <rfb/LogWriter.h>

#include "fltk/layout.h"
#include "ServerDialog.h"
#include "OptionsDialog.h"
#include "i18n.h"
#include "vncviewer.h"
#include "parameters.h"


using namespace std;
using namespace rfb;

static LogWriter vlog("ServerDialog");

const char* SERVER_HISTORY="tigervnc.history";

ServerDialog::ServerDialog()
  : Fl_Window(450, 0, _("VNC Viewer: Connection Details"))
{
  int x, y, x2;
  Fl_Button *button;
  Fl_Box *divider;

  usedDir = NULL;

  x = OUTER_MARGIN;
  y = OUTER_MARGIN;

  serverName = new Fl_Input_Choice(LBLLEFT(x, y, w() - OUTER_MARGIN*2,
                                   INPUT_HEIGHT, _("VNC server:")));
  y += INPUT_HEIGHT + INNER_MARGIN;

  x2 = x;

  button = new Fl_Button(x2, y, BUTTON_WIDTH, BUTTON_HEIGHT, _("Options..."));
  button->callback(this->handleOptions, this);
  x2 += BUTTON_WIDTH + INNER_MARGIN;

  button = new Fl_Button(x2, y, BUTTON_WIDTH, BUTTON_HEIGHT, _("Load..."));
  button->callback(this->handleLoad, this);
  x2 += BUTTON_WIDTH + INNER_MARGIN;

  button = new Fl_Button(x2, y, BUTTON_WIDTH, BUTTON_HEIGHT, _("Save As..."));
  button->callback(this->handleSaveAs, this);
  x2 += BUTTON_WIDTH + INNER_MARGIN;

  y += BUTTON_HEIGHT + INNER_MARGIN;

  divider = new Fl_Box(0, y, w(), 2);
  divider->box(FL_THIN_DOWN_FRAME);

  y += divider->h() + INNER_MARGIN;

  // Symmetric margin around bottom button bar
  y += OUTER_MARGIN - INNER_MARGIN;

  button = new Fl_Button(x, y, BUTTON_WIDTH, BUTTON_HEIGHT, _("About..."));
  button->callback(this->handleAbout, this);

  x2 = w() - OUTER_MARGIN - BUTTON_WIDTH*2 - INNER_MARGIN*1;

  button = new Fl_Button(x2, y, BUTTON_WIDTH, BUTTON_HEIGHT, _("Cancel"));
  button->callback(this->handleCancel, this);
  x2 += BUTTON_WIDTH + INNER_MARGIN;

  button = new Fl_Return_Button(x2, y, BUTTON_WIDTH, BUTTON_HEIGHT, _("Connect"));
  button->callback(this->handleConnect, this);
  x2 += BUTTON_WIDTH + INNER_MARGIN;

  y += BUTTON_HEIGHT + INNER_MARGIN;

  /* Needed for resize to work sanely */
  resizable(NULL);
  h(y-INNER_MARGIN+OUTER_MARGIN);

  callback(this->handleCancel, this);
}


ServerDialog::~ServerDialog()
{
  if (usedDir) 
    free(usedDir);
}


void ServerDialog::run(const char* servername, char *newservername)
{
  ServerDialog dialog;

  dialog.serverName->value(servername);

  dialog.show();

  try {
    size_t i;

    dialog.loadServerHistory();

    dialog.serverName->clear();
    for(i = 0; i < dialog.serverHistory.size(); ++i)
      dialog.serverName->add(dialog.serverHistory[i].c_str());
  } catch (Exception& e) {
    vlog.error("%s", e.str());
    fl_alert(_("Unable to load the server history:\n\n%s"),
             e.str());
  }

  while (dialog.shown()) Fl::wait();

  if (dialog.serverName->value() == NULL) {
    newservername[0] = '\0';
    return;
  }

  strncpy(newservername, dialog.serverName->value(), VNCSERVERNAMELEN);
  newservername[VNCSERVERNAMELEN - 1] = '\0';
}

void ServerDialog::handleOptions(Fl_Widget* /*widget*/, void* /*data*/)
{
  OptionsDialog::showDialog();
}


void ServerDialog::handleLoad(Fl_Widget* /*widget*/, void* data)
{
  ServerDialog *dialog = (ServerDialog*)data;

  if (!dialog->usedDir)
    getuserhomedir(&(dialog->usedDir));

  Fl_File_Chooser* file_chooser = new Fl_File_Chooser(dialog->usedDir, _("TigerVNC configuration (*.tigervnc)"), 
                                                      0, _("Select a TigerVNC configuration file"));
  file_chooser->preview(0);
  file_chooser->previewButton->hide();
  file_chooser->show();
  
  // Block until user picks something.
  while(file_chooser->shown())
    Fl::wait();
  
  // Did the user hit cancel?
  if (file_chooser->value() == NULL) {
    delete(file_chooser);
    return;
  }
  
  const char* filename = file_chooser->value();
  dialog->updateUsedDir(filename);

  try {
    dialog->serverName->value(loadViewerParameters(filename));
  } catch (Exception& e) {
    vlog.error("%s", e.str());
    fl_alert(_("Unable to load the specified configuration file:\n\n%s"),
             e.str());
  }

  delete(file_chooser);
}


void ServerDialog::handleSaveAs(Fl_Widget* /*widget*/, void* data)
{ 
  ServerDialog *dialog = (ServerDialog*)data;
  const char* servername = dialog->serverName->value();
  const char* filename;
  if (!dialog->usedDir)
    getuserhomedir(&dialog->usedDir);
  
  Fl_File_Chooser* file_chooser = new Fl_File_Chooser(dialog->usedDir, _("TigerVNC configuration (*.tigervnc)"), 
                                                      2, _("Save the TigerVNC configuration to file"));
  
  file_chooser->preview(0);
  file_chooser->previewButton->hide();
  file_chooser->show();
  
  while(1) {
    
    // Block until user picks something.
    while(file_chooser->shown())
      Fl::wait();
    
    // Did the user hit cancel?
    if (file_chooser->value() == NULL) {
      delete(file_chooser);
      return;
    }
    
    filename = file_chooser->value();
    dialog->updateUsedDir(filename);
    
    FILE* f = fopen(filename, "r");
    if (f) {

      // The file already exists.
      fclose(f);
      int overwrite_choice = fl_choice(_("%s already exists. Do you want to overwrite?"), 
                                       _("Overwrite"), _("No"), NULL, filename);
      if (overwrite_choice == 1) {

        // If the user doesn't want to overwrite:
        file_chooser->show();
        continue;
      }
    }

    break;
  }
  
  try {
    saveViewerParameters(filename, servername);
  } catch (Exception& e) {
    vlog.error("%s", e.str());
    fl_alert(_("Unable to save the specified configuration "
               "file:\n\n%s"), e.str());
  }
  
  delete(file_chooser);
}


void ServerDialog::handleAbout(Fl_Widget* /*widget*/, void* /*data*/)
{
  about_vncviewer();
}


void ServerDialog::handleCancel(Fl_Widget* /*widget*/, void* data)
{
  ServerDialog *dialog = (ServerDialog*)data;

  dialog->serverName->value("");
  dialog->hide();
}


void ServerDialog::handleConnect(Fl_Widget* /*widget*/, void *data)
{
  ServerDialog *dialog = (ServerDialog*)data;
  const char* servername = dialog->serverName->value();

  dialog->hide();

  try {
    saveViewerParameters(NULL, servername);
  } catch (Exception& e) {
    vlog.error("%s", e.str());
    fl_alert(_("Unable to save the default configuration:\n\n%s"),
             e.str());
  }

  try {
    vector<string>::iterator elem = std::find(dialog->serverHistory.begin(), dialog->serverHistory.end(), servername);
    // avoid duplicates in the history
    if(dialog->serverHistory.end() == elem) {
      dialog->serverHistory.insert(dialog->serverHistory.begin(), servername);
      dialog->saveServerHistory();
    }
  } catch (Exception& e) {
    vlog.error("%s", e.str());
    fl_alert(_("Unable to save the server history:\n\n%s"),
             e.str());
  }
}


void ServerDialog::loadServerHistory()
{
  serverHistory.clear();

#ifdef _WIN32
  loadHistoryFromRegKey(serverHistory);
  return;
#endif

  char* homeDir = NULL;
  if (getvnchomedir(&homeDir) == -1)
    throw Exception(_("Could not obtain the home directory path"));

  char filepath[PATH_MAX];
  snprintf(filepath, sizeof(filepath), "%s%s", homeDir, SERVER_HISTORY);
  delete[] homeDir;

  /* Read server history from file */
  FILE* f = fopen(filepath, "r");
  if (!f) {
    if (errno == ENOENT) {
      // no history file
      return;
    }
    throw Exception(_("Could not open \"%s\": %s"),
                    filepath, strerror(errno));
  }

  int lineNr = 0;
  while (!feof(f)) {
    char line[256];

    // Read the next line
    lineNr++;
    if (!fgets(line, sizeof(line), f)) {
      if (feof(f))
        break;

      fclose(f);
      throw Exception(_("Failed to read line %d in file %s: %s"),
                      lineNr, filepath, strerror(errno));
    }

    int len = strlen(line);

    if (len == (sizeof(line) - 1)) {
      fclose(f);
      throw Exception(_("Failed to read line %d in file %s: %s"),
                      lineNr, filepath, _("Line too long"));
    }

    if ((len > 0) && (line[len-1] == '\n')) {
      line[len-1] = '\0';
      len--;
    }
    if ((len > 0) && (line[len-1] == '\r')) {
      line[len-1] = '\0';
      len--;
    }

    if (len == 0)
      continue;

    serverHistory.push_back(line);
  }

  fclose(f);
}

void ServerDialog::saveServerHistory()
{
#ifdef _WIN32
  saveHistoryToRegKey(serverHistory);
  return;
#endif

  char* homeDir = NULL;
  if (getvnchomedir(&homeDir) == -1)
    throw Exception(_("Could not obtain the home directory path"));

  char filepath[PATH_MAX];
  snprintf(filepath, sizeof(filepath), "%s%s", homeDir, SERVER_HISTORY);
  delete[] homeDir;

  /* Write server history to file */
  FILE* f = fopen(filepath, "w+");
  if (!f)
    throw Exception(_("Could not open \"%s\": %s"),
                    filepath, strerror(errno));

  // Save the last X elements to the config file.
  for(size_t i=0; i < serverHistory.size() && i <= SERVER_HISTORY_SIZE; i++)
    fprintf(f, "%s\n", serverHistory[i].c_str());

  fclose(f);
}

void ServerDialog::updateUsedDir(const char* filename)
{
  char * name = strdup(filename);
  usedDir = strdup(dirname(name));
  free(name);
}
