////////////////////////////////////////////////////////////////////////////////
// taskwarrior - a command line task list manager.
//
// Copyright 2006 - 2011, Paul Beckingham, Federico Hernandez.
// All rights reserved.
//
// This program 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 program 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 program; if not, write to the
//
//     Free Software Foundation, Inc.,
//     51 Franklin Street, Fifth Floor,
//     Boston, MA
//     02110-1301
//     USA
//
////////////////////////////////////////////////////////////////////////////////

#define L10N                                           // Localization complete.

#include <vector>
#include <sstream>
#include <algorithm>
#include <text.h>
#include <i18n.h>
#include <Context.h>
#include <Directory.h>
#include <ViewText.h>
#include <CmdShow.h>

extern Context context;

////////////////////////////////////////////////////////////////////////////////
CmdShow::CmdShow ()
{
  _keyword     = "show";
  _usage       = "task          show [all | substring]";
  _description = STRING_CMD_SHOW;
  _read_only   = true;
  _displays_id = false;
}

////////////////////////////////////////////////////////////////////////////////
int CmdShow::execute (std::string& output)
{
  int rc = 0;
  std::stringstream out;

  // Obtain the arguments from the description.  That way, things like '--'
  // have already been handled.
  std::vector <std::string> words = context.a3.extract_words ();
  if (words.size () > 2)
    throw std::string (STRING_CMD_SHOW_ARGS);

  int width = context.getWidth ();

  // Complain about configuration variables that are not recognized.
  // These are the regular configuration variables.
  // Note that there is a leading and trailing space, to make it easier to
  // search for whole words.
  std::string recognized =
    " abbreviation.minimum"
    " active.indicator"
    " annotations"
    " avoidlastcolumn"
    " bulk"
    " burndown.bias"
    " calendar.details"
    " calendar.details.report"
    " calendar.holidays"
    " calendar.legend"
    " calendar.offset"
    " calendar.offset.value"
    " color"
    " color.active"
    " color.alternate"
    " color.blocked"
    " color.burndown.done"
    " color.burndown.pending"
    " color.burndown.started"
    " color.calendar.due"
    " color.calendar.due.today"
    " color.calendar.holiday"
    " color.calendar.overdue"
    " color.calendar.today"
    " color.calendar.weekend"
    " color.calendar.weeknumber"
    " color.completed"
    " color.debug"
    " color.deleted"
    " color.due"
    " color.due.today"
    " color.footnote"
    " color.header"
    " color.history.add"
    " color.history.delete"
    " color.history.done"
    " color.label"
    " color.overdue"
    " color.pri.H"
    " color.pri.L"
    " color.pri.M"
    " color.pri.none"
    " color.recurring"
    " color.summary.background"
    " color.summary.bar"
    " color.sync.added"
    " color.sync.changed"
    " color.sync.rejected"
    " color.tagged"
    " color.undo.after"
    " color.undo.before"
    " column.padding"
    " column.spacing"
    " complete.all.projects"
    " complete.all.tags"
    " confirmation"
    " data.location"
    " dateformat"
    " dateformat.annotation"
    " dateformat.holiday"
    " dateformat.report"
    " debug"
    " default.command"
    " default.due"
    " default.priority"
    " default.project"
    " defaultheight"
    " defaultwidth"
    " dependency.confirmation"
    " dependency.indicator"
    " dependency.reminder"
    " detection"
    " displayweeknumber"
    " dom"
    " due"
    " echo.command"                      // Deprecated 2.0
    " edit.verbose"
    " editor"
    " exit.on.missing.db"
    " export.ical.class"
    " expressions"
    " extensions"
    " fontunderline"
    " gc"
    " hyphenate"
    " indent.annotation"
    " indent.report"
    " journal.info"
    " journal.time"
    " journal.time.start.annotation"
    " journal.time.stop.annotation"
    " json.array"
    " list.all.projects"
    " list.all.tags"
    " locale"
    " locking"
    " merge.autopush"
    " merge.default.uri"
    " monthsperline"
    " nag"
    " patterns"
    " project"
    " pull.default.uri"
    " push.default.uri"
    " recurrence.indicator"
    " recurrence.limit"
    " regex"
    " row.padding"
    " rule.precedence.color"
    " search.case.sensitive"
    " shadow.command"
    " shadow.file"
    " shadow.notify"
    " shell.prompt"
    " tag.indicator"
    " undo.style"
    " urgency.active.coefficient"
    " urgency.annotations.coefficient"
    " urgency.blocked.coefficient"
    " urgency.blocking.coefficient"
    " urgency.due.coefficient"
    " urgency.next.coefficient"
    " urgency.priority.coefficient"
    " urgency.project.coefficient"
    " urgency.tags.coefficient"
    " urgency.waiting.coefficient"
    " verbose"
    " weekstart"
    " xterm.title"
    " ";

  // This configuration variable is supported, but not documented.  It exists
  // so that unit tests can force color to be on even when the output from task
  // is redirected to a file, or stdout is not a tty.
  recognized += "_forcecolor ";

  std::vector <std::string> all;
  context.config.all (all);

  std::vector <std::string> unrecognized;
  std::vector <std::string>::iterator i;
  for (i = all.begin (); i != all.end (); ++i)
  {
    // Disallow partial matches by tacking a leading and trailing space on each
    // variable name.
    std::string pattern = " " + *i + " ";
    if (recognized.find (pattern) == std::string::npos)
    {
      // These are special configuration variables, because their name is
      // dynamic.
      if (i->substr (0, 14) != "color.keyword."        &&
          i->substr (0, 14) != "color.project."        &&
          i->substr (0, 10) != "color.tag."            &&
          i->substr (0,  8) != "holiday."              &&
          i->substr (0,  7) != "report."               &&
          i->substr (0,  6) != "alias."                &&
          i->substr (0,  5) != "hook."                 &&
          i->substr (0, 21) != "urgency.user.project." &&
          i->substr (0, 17) != "urgency.user.tag.")
      {
        unrecognized.push_back (*i);
      }
    }
  }

  // Find all the values that match the defaults, for highlighting.
  std::vector <std::string> default_values;
  Config default_config;
  default_config.setDefaults ();

  for (i = all.begin (); i != all.end (); ++i)
    if (context.config.get (*i) != default_config.get (*i))
      default_values.push_back (*i);

  // Create output view.
  ViewText view;
  view.width (width);
  view.add (Column::factory ("string", STRING_CMD_SHOW_CONF_VAR));
  view.add (Column::factory ("string", STRING_CMD_SHOW_CONF_VALUE));

  Color error ("bold white on red");
  Color warning ("black on yellow");

  std::string section;

  // Look for the first plausible argument which could be a pattern 
  if (words.size ())
    section = words[0];

  if (section == "all")
    section = "";

  for (i = all.begin (); i != all.end (); ++i)
  {
    std::string::size_type loc = i->find (section, 0);
    if (loc != std::string::npos)
    {
      // Look for unrecognized.
      Color color;
      if (std::find (unrecognized.begin (), unrecognized.end (), *i) != unrecognized.end ())
        color = error;
      else if (std::find (default_values.begin (), default_values.end (), *i) != default_values.end ())
        color = warning;

      int row = view.addRow ();
      view.set (row, 0, *i, color);
      view.set (row, 1, context.config.get (*i), color);
    }
  }

  out << "\n"
      << view.render ()
      << (view.rows () == 0 ? STRING_CMD_SHOW_NONE : "")
      << (view.rows () == 0 ? "\n\n" : "\n");

  // Display the unrecognized variables.
  if (unrecognized.size ())
  {
    out << STRING_CMD_SHOW_UNREC << "\n";

    for (i = unrecognized.begin (); i != unrecognized.end (); ++i)
      out << "  " << *i << "\n";

    if (context.color ())
      out << "\n  " << format (STRING_CMD_SHOW_DIFFER_COLOR, error.colorize ("color"));

    out << "\n\n";
  }

  if (default_values.size ())
  {
    out << STRING_CMD_SHOW_DIFFER;

    if (context.color ())
      out << "  " << format (STRING_CMD_SHOW_DIFFER_COLOR, warning.colorize ("color"));
  }

  out << context.config.checkForDeprecatedColor ();
  out << context.config.checkForDeprecatedColumns ();
  // TODO Check for referenced but missing theme files.
  // TODO Check for referenced but missing string files.
  // TODO Check for referenced but missing tips files.

  // Check for referenced but missing hook scripts.
#ifdef HAVE_LIBLUA
  std::vector <std::string> missing_scripts;
  for (i = all.begin (); i != all.end (); ++i)
  {
    if (i->substr (0, 5) == "hook.")
    {
      std::string value = context.config.get (*i);
      Nibbler n (value);

      // <path>:<function> [, ...]
      while (!n.depleted ())
      {
        std::string file;
        std::string function;
        if (n.getUntil (':', file) &&
            n.skip (':')           &&
            n.getUntil (',', function))
        {
          Path script (file);
          if (!script.exists () || !script.readable ())
            missing_scripts.push_back (file);

          (void) n.skip (',');
        }
      }
    }
  }

  if (missing_scripts.size ())
  {
    out << STRING_CMD_SHOW_HOOKS << "\n";

    for (i = missing_scripts.begin (); i != missing_scripts.end (); ++i)
      out << "  " << *i << "\n";

    out << "\n";
  }
#endif

  // Check for bad values in rc.annotations.
  // TODO Reconsider this.
  std::string annotations = context.config.get ("annotations");
  if (annotations != "full"   &&
      annotations != "sparse" &&
      annotations != "none")
    out << format (STRING_CMD_SHOW_CONFIG_ERROR, "annotations", annotations)
        << "\n";

  // Check for bad values in rc.calendar.details.
  std::string calendardetails = context.config.get ("calendar.details");
  if (calendardetails != "full"   &&
      calendardetails != "sparse" &&
      calendardetails != "none")
    out << format (STRING_CMD_SHOW_CONFIG_ERROR, "calendar.details", calendardetails)
        << "\n";

  // Check for bad values in rc.calendar.holidays.
  std::string calendarholidays = context.config.get ("calendar.holidays");
  if (calendarholidays != "full"   &&
      calendarholidays != "sparse" &&
      calendarholidays != "none")
    out << format (STRING_CMD_SHOW_CONFIG_ERROR, "calendar.holidays", calendarholidays)
        << "\n";

  // Check for bad values in rc.default.priority.
  std::string defaultPriority = context.config.get ("default.priority");
  if (defaultPriority != "H" &&
      defaultPriority != "M" &&
      defaultPriority != "L" &&
      defaultPriority != "")
    out << format (STRING_CMD_SHOW_CONFIG_ERROR, "default.priority", defaultPriority)
        << "\n";

  // Verify installation.  This is mentioned in the documentation as the way
  // to ensure everything is properly installed.

  if (all.size () == 0)
  {
    out << STRING_CMD_SHOW_EMPTY << "\n";
    rc = 1;
  }
  else
  {
    Directory location (context.config.get ("data.location"));

    if (location._data == "")
      out << STRING_CMD_SHOW_NO_LOCATION << "\n";

    if (! location.exists ())
      out << STRING_CMD_SHOW_LOC_EXIST << "\n";
  }

  output = out.str ();
  return rc;
}

////////////////////////////////////////////////////////////////////////////////