/*
    Copyright (c) 2009 Andras Mantia <amantia@kde.org>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#include "searchjob.h"

#include <KDE/KLocalizedString>
#include <KDE/KDebug>

#include <QtCore/QDate>

#include "job_p.h"
#include "message_p.h"
#include "session_p.h"
#include "imapset.h"

namespace KIMAP
{


class Term::Private {
public:
  Private(): isFuzzy(false), isNegated(false), isNull(false) {};
  QByteArray command;
  bool isFuzzy;
  bool isNegated;
  bool isNull;
};

Term::Term()
:  d(new Term::Private)
{
  d->isNull = true;
}

Term::Term(Term::Relation relation, const QVector<Term> &subterms)
:  d(new Term::Private)
{
  if (subterms.size() >= 2) {
    d->command += "(";
    if (relation == KIMAP::Term::Or) {
      d->command += "OR ";
      d->command += subterms.at(0).serialize() + ' ';
      if (subterms.size() >= 3) {
        Term t(relation, subterms.mid(1));
        d->command += t.serialize();
      } else if (subterms.size() == 2) {
        d->command += subterms.at(1).serialize();
      }
    } else {
      Q_FOREACH (const Term &t, subterms) {
        d->command += t.serialize() + ' ';
      }
      if (!subterms.isEmpty()) {
        d->command.chop(1);
      }
    }
    d->command += ")";
  } else if (subterms.size() == 1) {
    d->command += subterms.first().serialize();
  } else {
    d->isNull = true;
  }
}

Term::Term(Term::SearchKey key, const QString& value)
:  d(new Term::Private)
{
  switch(key) {
    case All:
      d->command += "ALL";
      break;
    case Bcc:
      d->command += "BCC";
      break;
    case Cc:
      d->command += "CC";
      break;
    case Body:
      d->command += "BODY";
      break;
    case From:
      d->command += "FROM";
      break;
    case Keyword:
      d->command += "KEYWORD";
      break;
    case Subject:
      d->command += "SUBJECT";
      break;
    case Text:
      d->command += "TEXT";
      break;
    case To:
      d->command += "TO";
      break;
  }
  if (key != All) {
    d->command += " \"" + QByteArray(value.toUtf8().constData()) + "\"";
  }
}

Term::Term( const QString &header, const QString &value )
:  d(new Term::Private)
{
  d->command += "HEADER";
  d->command += ' ' + QByteArray(header.toUtf8().constData());
  d->command += " \"" + QByteArray(value.toUtf8().constData()) + "\"";
}

Term::Term(Term::BooleanSearchKey key)
:  d(new Term::Private)
{
  switch (key) {
    case Answered:
      d->command = "ANSWERED";
      break;
    case Deleted:
      d->command = "DELETED";
      break;
    case Draft:
      d->command = "DRAFT";
      break;
    case Flagged:
      d->command = "FLAGGED";
      break;
    case New:
      d->command = "NEW";
      break;
    case Old:
      d->command = "OLD";
      break;
    case Recent:
      d->command = "RECENT";
      break;
    case Seen:
      d->command = "SEEN";
      break;
  }
}

QMap<int, QByteArray> initializeMonths()
{
  QMap<int, QByteArray> months;
  //don't use QDate::shortMonthName(), it returns a localized month name
  months[1] = "Jan";
  months[2] = "Feb";
  months[3] = "Mar";
  months[4] = "Apr";
  months[5] = "May";
  months[6] = "Jun";
  months[7] = "Jul";
  months[8] = "Aug";
  months[9] = "Sep";
  months[10] = "Oct";
  months[11] = "Nov";
  months[12] = "Dec";
  return months;
}

static QMap<int, QByteArray> months = initializeMonths();

Term::Term(Term::DateSearchKey key, const QDate &date)
:  d(new Term::Private)
{
  switch (key) {
    case Before:
      d->command = "BEFORE";
      break;
    case On:
      d->command = "ON";
      break;
    case SentBefore:
      d->command = "SENTBEFORE";
      break;
    case SentOn:
      d->command = "SENTON";
      break;
    case SentSince:
      d->command = "SENTSINCE";
      break;
    case Since:
      d->command = "SINCE";
      break;
  }
  d->command += " \"";
  d->command += QByteArray::number( date.day() ) + '-';
  d->command += months[date.month()] + '-';
  d->command += QByteArray::number( date.year() );
  d->command += '\"';
}

Term::Term(Term::NumberSearchKey key, int value)
:  d(new Term::Private)
{
  switch (key) {
    case Larger:
      d->command = "LARGER";
      break;
    case Smaller:
      d->command = "SMALLER";
      break;
  }
  d->command += " " + QByteArray::number(value);
}

Term::Term(Term::SequenceSearchKey key, const ImapSet &set)
:  d(new Term::Private)
{
  switch (key) {
    case Uid:
      d->command = "UID";
      break;
    case SequenceNumber:
      break;
  }
  d->command += " " + set.toImapSequenceSet();
}

Term::Term(const Term& other)
:  d(new Term::Private)
{
  *d = *other.d;
}

Term& Term::operator=(const Term& other)
{
  *d = *other.d;
  return *this;
}

bool Term::operator==(const Term& other) const
{
  return d->command == other.d->command &&
         d->isNegated == other.d->isNegated &&
         d->isFuzzy == other.d->isFuzzy;
}

QByteArray Term::serialize() const
{
  QByteArray command;
  if (d->isFuzzy) {
    command = "FUZZY ";
  }
  if (d->isNegated) {
    command = "NOT ";
  }
  return command + d->command;
}

Term &Term::setFuzzy(bool fuzzy)
{
  d->isFuzzy = fuzzy;
  return *this;
}

Term &Term::setNegated(bool negated)
{
  d->isNegated = negated;
  return *this;
}

bool Term::isNull() const
{
  return d->isNull;
}

//TODO: when custom error codes are introduced, handle the NO [TRYCREATE] response

  class SearchJobPrivate : public JobPrivate
  {
    public:
      SearchJobPrivate( Session *session, const QString& name ) : JobPrivate( session, name ), logic( SearchJob::And ) {
        criteriaMap[SearchJob::All]  = "ALL";
        criteriaMap[SearchJob::Answered] = "ANSWERED";
        criteriaMap[SearchJob::BCC] = "BCC";
        criteriaMap[SearchJob::Before] = "BEFORE";
        criteriaMap[SearchJob::Body] = "BODY";
        criteriaMap[SearchJob::CC] = "CC";
        criteriaMap[SearchJob::Deleted] = "DELETED";
        criteriaMap[SearchJob::Draft] = "DRAFT";
        criteriaMap[SearchJob::Flagged] = "FLAGGED";
        criteriaMap[SearchJob::From] = "FROM";
        criteriaMap[SearchJob::Header] = "HEADER";
        criteriaMap[SearchJob::Keyword] = "KEYWORD";
        criteriaMap[SearchJob::Larger] = "LARGER";
        criteriaMap[SearchJob::New] = "NEW";
        criteriaMap[SearchJob::Old] = "OLD";
        criteriaMap[SearchJob::On] = "ON";
        criteriaMap[SearchJob::Recent] = "RECENT";
        criteriaMap[SearchJob::Seen] = "SEEN";
        criteriaMap[SearchJob::SentBefore] = "SENTBEFORE";
        criteriaMap[SearchJob::SentOn] = "SENTON";
        criteriaMap[SearchJob::SentSince] = "SENTSINCE";
        criteriaMap[SearchJob::Since] = "SINCE";
        criteriaMap[SearchJob::Smaller] = "SMALLER";
        criteriaMap[SearchJob::Subject] = "SUBJECT";
        criteriaMap[SearchJob::Text] = "TEXT";
        criteriaMap[SearchJob::To] = "TO";
        criteriaMap[SearchJob::Uid] = "UID";
        criteriaMap[SearchJob::Unanswered] = "UNANSWERED";
        criteriaMap[SearchJob::Undeleted] = "UNDELETED";
        criteriaMap[SearchJob::Undraft] = "UNDRAFT";
        criteriaMap[SearchJob::Unflagged] = "UNFLAGGED";
        criteriaMap[SearchJob::Unkeyword] = "UNKEYWORD";
        criteriaMap[SearchJob::Unseen] = "UNSEEN";

        //don't use QDate::shortMonthName(), it returns a localized month name
        months[1] = "Jan";
        months[2] = "Feb";
        months[3] = "Mar";
        months[4] = "Apr";
        months[5] = "May";
        months[6] = "Jun";
        months[7] = "Jul";
        months[8] = "Aug";
        months[9] = "Sep";
        months[10] = "Oct";
        months[11] = "Nov";
        months[12] = "Dec";

        nextContent = 0;
        uidBased = false;
      }
      ~SearchJobPrivate() { }

      QByteArray charset;
      QList<QByteArray> criterias;
      QMap<SearchJob::SearchCriteria, QByteArray > criteriaMap;
      QMap<int, QByteArray> months;
      SearchJob::SearchLogic logic;
      QList<QByteArray> contents;
      QList<qint64> results;
      uint nextContent;
      bool uidBased;
      Term term;
  };
}

using namespace KIMAP;

SearchJob::SearchJob( Session *session )
  : Job( *new SearchJobPrivate( session, i18nc( "Name of the search job", "Search" ) ) )
{
}

SearchJob::~SearchJob()
{
}

void SearchJob::setTerm(const Term &term)
{
  Q_D( SearchJob );
  d->term = term;
}

void SearchJob::doStart()
{
  Q_D( SearchJob );

  QByteArray searchKey;

  if ( !d->charset.isEmpty() ) {
    searchKey = "CHARSET " + d->charset;
  }

  if (!d->term.isNull()) {
    const QByteArray term = d->term.serialize();
    if (term.startsWith('(')) {
      searchKey += term.mid(1, term.size() - 2);
    } else {
      searchKey += term;
    }
  } else {

    if ( d->logic == SearchJob::Not ) {
      searchKey += "NOT ";
    } else if ( d->logic == SearchJob::Or && d->criterias.size() > 1 ) {
      searchKey += "OR ";
    }

    if ( d->logic == SearchJob::And ) {
      for ( int i = 0; i < d->criterias.size(); i++ ) {
        const QByteArray key = d->criterias.at( i );
        if ( i > 0 ) {
          searchKey += ' ';
        }
        searchKey += key;
      }
    } else {
      for ( int i = 0; i < d->criterias.size(); i++ ) {
        const QByteArray key = d->criterias.at( i );
        if ( i > 0 ) {
          searchKey += ' ';
        }
        searchKey += '(' + key + ')';
      }
    }
  }

  QByteArray command = "SEARCH";
  if ( d->uidBased ) {
    command = "UID " + command;
  }

  d->tags << d->sessionInternal()->sendCommand( command, searchKey );
}

void SearchJob::handleResponse( const Message &response )
{
  Q_D( SearchJob );

  if ( handleErrorReplies( response ) == NotHandled  ) {
    if ( response.content[0].toString() == "+" ) {
      if (d->term.isNull()) {
        d->sessionInternal()->sendData( d->contents[d->nextContent] );
      } else {
        kWarning() << "The term API only supports inline strings.";
      }
      d->nextContent++;
    } else if ( response.content[1].toString() == "SEARCH" ) {
      for ( int i = 2; i < response.content.size(); i++ ) {
        d->results.append( response.content[i].toString().toInt() );
      }
    }
  }
}

void SearchJob::setCharset( const QByteArray &charset )
{
  Q_D( SearchJob );
  d->charset = charset;
}

QByteArray SearchJob::charset() const
{
  Q_D( const SearchJob );
  return d->charset;
}

void SearchJob::setSearchLogic( SearchLogic logic )
{
  Q_D( SearchJob );
  d->logic = logic;
}

void SearchJob::addSearchCriteria( SearchCriteria criteria )
{
  Q_D( SearchJob );

  switch ( criteria ) {
    case All:
    case Answered:
    case Deleted:
    case Draft:
    case Flagged:
    case New:
    case Old:
    case Recent:
    case Seen:
    case Unanswered:
    case Undeleted:
    case Undraft:
    case Unflagged:
    case Unseen:
      d->criterias.append( d->criteriaMap[criteria] );
      break;
    default:
      //TODO Discuss if we keep error checking here, or accept anything, even if it is wrong
      kDebug() << "Criteria " << d->criteriaMap[criteria] << " needs an argument, but none was specified.";
      break;
  }
}

void SearchJob::addSearchCriteria( SearchCriteria criteria, int argument )
{
  Q_D( SearchJob );
  switch ( criteria ) {
    case Larger:
    case Smaller:
      d->criterias.append( d->criteriaMap[criteria] + ' ' + QByteArray::number( argument ) );
      break;
    default:
      //TODO Discuss if we keep error checking here, or accept anything, even if it is wrong
      kDebug() << "Criteria " << d->criteriaMap[criteria] << " doesn't accept an integer as an argument.";
      break;
  }
}

void SearchJob::addSearchCriteria( SearchCriteria criteria, const QByteArray &argument )
{
  Q_D( SearchJob );
  switch ( criteria ) {
    case BCC:
    case Body:
    case CC:
    case From:
    case Subject:
    case Text:
    case To:
      d->contents.append( argument );
      d->criterias.append( d->criteriaMap[criteria] + " {" + QByteArray::number( argument.size() ) + '}' );
      break;
    case Keyword:
    case Unkeyword:
    case Header:
    case Uid:
      d->criterias.append( d->criteriaMap[criteria] + ' ' + argument );
      break;
    default:
      //TODO Discuss if we keep error checking here, or accept anything, even if it is wrong
      kDebug() << "Criteria " << d->criteriaMap[criteria] << " doesn't accept any argument.";
      break;
  }
}

void SearchJob::addSearchCriteria( SearchCriteria criteria, const QDate &argument )
{
  Q_D( SearchJob );
  switch ( criteria ) {
    case Before:
    case On:
    case SentBefore:
    case SentSince:
    case Since: {
      QByteArray date = QByteArray::number( argument.day() ) + '-';
      date += d->months[argument.month()] + '-';
      date += QByteArray::number( argument.year() );
      d->criterias.append( d->criteriaMap[criteria] + " \"" + date + '\"' );
      break;
    }
    default:
      //TODO Discuss if we keep error checking here, or accept anything, even if it is wrong
      kDebug() << "Criteria " << d->criteriaMap[criteria] << " doesn't accept a date as argument.";
      break;
  }
}

void SearchJob::addSearchCriteria( const QByteArray &searchCriteria )
{
  Q_D( SearchJob );
  d->criterias.append( searchCriteria );
}

void SearchJob::setUidBased(bool uidBased)
{
  Q_D( SearchJob );
  d->uidBased = uidBased;
}

bool SearchJob::isUidBased() const
{
  Q_D( const SearchJob );
  return d->uidBased;
}

QList<qint64> SearchJob::results() const
{
  Q_D( const SearchJob );
  return d->results;
}

QList<int> SearchJob::foundItems()
{
  Q_D( const SearchJob );

  QList<int> results;
  qCopy( d->results.begin(), d->results.end(), results.begin() );

  return results;
}