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package VNDB::Util::DB;

use strict;
use warnings;
use DBI;
use Exporter 'import';
use Storable 'nfreeze', 'thaw';

use vars ('$VERSION', '@EXPORT');
$VERSION = $VNDB::VERSION;

@EXPORT = qw|
  DBInit DBCheck DBCommit DBRollBack DBExit
  DBLanguageCount DBCategoryCount DBTableCount DBGetHist DBLockItem DBIncId
  DBGetUser DBAddUser DBUpdateUser
  DBGetVotes DBVoteStats DBAddVote DBDelVote
  DBGetVNList DBVNListStats DBAddVNList DBEditVNList DBDelVNList
  DBGetVN DBAddVN DBEditVN DBDelVN DBHideVN DBUndefRG DBVNCache
  DBGetRelease DBAddRelease DBEditRelease DBDelRelease DBHideRelease
  DBGetProducer DBGetProducerVN DBAddProducer DBEditProducer DBDelProducer DBHideProducer
  DBExec DBRow DBAll DBLastId
|;





#-----------------------------------------------------------------------------#
#                     I M P O R T A N T   S T U F F                           #
#-----------------------------------------------------------------------------#


sub new {
  my $me = shift;

  my $type = ref($me) || $me;
  $me = bless { o => \@_ }, $type;
  
  $me->DBInit();

  return $me;
}


sub DBInit {
  my $self = shift;
  my $info = $self->{_DB} || $self;
  
  $info->{sql} = DBI->connect(@{$self->{o}}, {
      PrintError => 0, RaiseError => 1,
      AutoCommit => 0, pg_enable_utf8 => 1,  
    }
  );
}


sub DBCheck {
  my $self = shift;
  my $info = $self->{_DB} || $self;

  require Time::HiRes
    if $self->{debug} && !$Time::Hires::VERSION;
  $info->{Queries} = [] if $self->{debug};
  my $start = [Time::HiRes::gettimeofday()] if $self->{debug};

  if(!$info->{sql}->ping) {
    warn "Ping failed, reconnecting";
    $self->DBInit;
  }
  $info->{sql}->rollback();
  push(@{$info->{Queries}},
    [ 'ping/rollback', Time::HiRes::tv_interval($start) ])
   if $self->{debug};
}


sub DBCommit {
  my $self = shift;
  my $info = $self->{_DB} || $self;
  my $start = [Time::HiRes::gettimeofday()] if $self->{debug};
  $info->{sql}->commit();
  push(@{$info->{Queries}},
    [ 'commit', Time::HiRes::tv_interval($start) ])
   if $self->{debug};
}


sub DBRollBack {
  my $self = shift;
  my $info = $self->{_DB} || $self;
  $info->{sql}->rollback();
}


sub DBExit {
  my $self = shift;
  my $info = $self->{_DB} || $self; 
  $info->{sql}->disconnect();
}


# XXX: this function should be disabled when performance is going to be a problem
sub DBCategoryCount {
  return {
    (map { map { $_, 0 } keys %{$VNDB::CAT->{$_}[1]} } keys %{$VNDB::CAT}),
    map { $_->{cat}, $_->{cnt} } @{shift->DBAll(q|
    SELECT cat, COUNT(vid) AS cnt
      FROM vn_categories vc
      JOIN vn v ON v.latest = vc.vid
      GROUP BY cat
      ORDER BY cnt|
    )}
  };
}


# XXX: Above comment also applies to this function
sub DBLanguageCount {
  return { (map { $_ => 0 } keys %$VNDB::LANG ),
    map { $_->{language} => $_->{count} } @{shift->DBAll(q|
    SELECT rr.language, COUNT(DISTINCT rv.vid) AS count
      FROM releases_rev rr
      JOIN releases r ON r.latest = rr.id
      JOIN releases_vn rv ON rv.rid = rr.id
      GROUP BY rr.language|)} };
}


sub DBTableCount { # table (users, producers, vn, releases, votes)
  return $_[0]->DBRow(q|
    SELECT COUNT(*) as cnt
      FROM %s
      %s|,
    $_[1],
    $_[1] =~ /producers|vn|releases/ ? 'WHERE hidden = 0' : '',
  )->{cnt};
}



# XXX: iid, ititle and hidden columns should be cached if performance will be a problem
sub DBGetHist { # %options->{ type, id, cid, caused, next, page, results, ip, edits, showhid, what }  (Item hist)
  my($s, %o) = @_;

  $o{results} ||= $o{next} ? 1 : 50;
  $o{page} ||= 1;
  $o{type} ||= '';
  $o{what} ||= ''; #flags: user iid ititle
  $o{showhid} ||= $o{type} && $o{type} ne 'u' && $o{id} || $o{cid} ? 1 : 0;

  my %where = (
    $o{cid} ? (
      'c.id IN(!l)' => $o{cid} ) : (),
    $o{type} eq 'u' ? (
      'c.requester = %d' => $o{id} ) : (),

    $o{type} eq 'v' && !$o{releases} ? ( 'c.type = 0' => 1,
      $o{id} ? ( 'vr.vid = %d' => $o{id} ) : () ) : (),
    $o{type} eq 'v' && $o{releases} ? (
      '((c.type = 0 AND vr.vid = %d) OR (c.type = 1 AND rv.vid = %1$d))' => $o{id} ) : (),
    
    $o{type} eq 'r' ? ( 'c.type = 1' => 1,
      $o{id} ? ( 'rr.rid = %d' => $o{id} ) : () ) : (),
    $o{type} eq 'p' ? ( 'c.type = 2' => 1,
      $o{id} ? ( 'pr.pid = %d' => $o{id} ) : () ) : (),

    $o{next} ? ( 
      'c.id > %d' => $o{next} ) : (),
    $o{caused} ? (
      'c.causedby = %d' => $o{caused} ) : (),
    $o{ip} ? (
      'c.ip = !s' => $o{ip} ) : (),
    defined $o{edits} && !$o{edits} ? (
      'c.prev = 0' => 1 ) : (),
    $o{edits} ? (
      'c.prev > 0' => 1 ) : (),

   # get rid of 'hidden' items
    !$o{showhid} ? (
      '(v.hidden IS NOT NULL AND v.hidden = 0 OR r.hidden IS NOT NULL AND r.hidden = 0 OR p.hidden IS NOT NULL AND p.hidden = 0)' => 1,
    ) : $o{showhid} == 2 ? (
      '(v.hidden IS NOT NULL AND v.hidden = 1 OR r.hidden IS NOT NULL AND r.hidden = 1 OR p.hidden IS NOT NULL AND p.hidden = 1)' => 1,
    ) : (),
  );

  my $where = keys %where ? 'WHERE !W' : '';

  my $select = 'c.id, c.type, c.added, c.requester, c.comments, c.prev, c.causedby';
  $select .= ', u.username' if $o{what} =~ /user/;
  $select .= ', COALESCE(vr.vid, rr.rid, pr.pid) AS iid' if $o{what} =~ /iid/;
  $select .= ', COALESCE(vr2.title, rr2.title, pr2.name) AS ititle' if $o{what} =~ /ititle/;

  my $join = '';
  $join .= ' JOIN users u ON u.id = c.requester' if $o{what} =~ /user/;
  $join .= ' LEFT JOIN vn_rev vr ON c.type = 0 AND c.id = vr.id'.
           ' LEFT JOIN releases_rev rr ON c.type = 1 AND c.id = rr.id'.
           ' LEFT JOIN producers_rev pr ON c.type = 2 AND c.id = pr.id' if $o{what} =~ /(iid|ititle)/ || $o{releases} || $o{id} || !$o{showhid};
 # these joins should be optimised away at some point (cache the required columns in changes as mentioned above)
  $join .= ' LEFT JOIN vn v ON v.id = vr.vid'.
           ' LEFT JOIN vn_rev vr2 ON vr2.id = v.latest'.
           ' LEFT JOIN releases r ON r.id = rr.rid'.
           ' LEFT JOIN releases_rev rr2 ON rr2.id = r.latest'.
           ' LEFT JOIN producers p ON p.id = pr.pid'.
           ' LEFT JOIN producers_rev pr2 ON pr2.id = p.latest' if $o{what} =~ /ititle/ || $o{releases} || !$o{showhid};
  $join .= ' LEFT JOIN releases_vn rv ON c.id = rv.rid' if $o{type} eq 'v' && $o{releases};

  my $r = $s->DBAll(qq|
    SELECT $select
      FROM changes c
      $join
      $where
      ORDER BY c.id %s
      LIMIT %d OFFSET %d|,
    $where ? \%where : (),
    $o{next} ? 'ASC' : 'DESC',
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );
  return $r if !wantarray;
  return ($r, 0) if $#$r != $o{results};
  pop @$r;
  return ($r, 1);
}


sub DBLockItem { # table, id, locked
  my($s, $tbl, $id, $l) = @_;
  $s->DBExec(q|
    UPDATE %s
      SET locked = %d
      WHERE id = %d|,
    $tbl, $l, $id);
}


sub DBIncId { # sequence (this is a rather low-level function... aww heck...)
  return $_[0]->DBRow(q|SELECT nextval(!s) AS ni|, $_[1])->{ni};
}



#-----------------------------------------------------------------------------#
#                      A U T H / U S E R   S T U F F                          #
#-----------------------------------------------------------------------------#


sub DBGetUser { # %options->{ username mail passwd order firstchar uid results page what }
  my $s = shift;
  my %o = (
    order => 'username ASC',
    page => 1,
    results => 10,
    what => '',
    @_
  );

  my %where = (
    $o{username} ? (
      'username = !s' => $o{username} ) : (),
    $o{mail} ? (
      'mail = !s' => $o{mail} ) : (),
    $o{passwd} ? (
      'passwd = decode(!s, \'hex\')' => $o{passwd} ) : (),
    $o{firstchar} ? (
      'SUBSTRING(username from 1 for 1) = !s' => $o{firstchar} ) : (),
    !$o{firstchar} && defined $o{firstchar} ? (
      'ASCII(username) < 97 OR ASCII(username) > 122' => 1 ) : (),
    $o{uid} ? (
      'id = %d' => $o{uid} ) : (),
  );

  my $where = keys %where ? 'AND !W' : '';
  my $r = $s->DBAll(qq|
    SELECT *
      FROM users u
      WHERE id > 0 $where
      ORDER BY %s
      LIMIT %d OFFSET %d|,
    $where ? \%where : (),
    $o{order},
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );

  if($o{what} =~ /list/ && $#$r >= 0) {
    my %r = map {
      $r->[$_]{votes} = 0;
      $r->[$_]{vnlist} = 0;
      $r->[$_]{changes} = 0;
      ($r->[$_]{id}, $_)
    } 0..$#$r;
    
    $r->[$r{$_->{uid}}]{votes} = $_->{cnt} for (@{$s->DBAll(q|
      SELECT uid, COUNT(vid) AS cnt
        FROM votes
        WHERE uid IN(!l)
        GROUP BY uid|,
      [ keys %r ]
    )});

    $r->[$r{$_->{uid}}]{vnlist} = $_->{cnt} for (@{$s->DBAll(q|
      SELECT uid, COUNT(vid) AS cnt
        FROM vnlists
        WHERE uid IN(!l)
        GROUP BY uid|,
      [ keys %r ]
    )});

    $r->[$r{$_->{requester}}]{changes} = $_->{cnt} for (@{$s->DBAll(q|
      SELECT requester, COUNT(id) AS cnt
        FROM changes
        WHERE requester IN(!l)
        GROUP BY requester|,
      [ keys %r ]
    )});
  }

  return $r if !wantarray;
  return ($r, 0) if $#$r != $o{results};
  pop @$r;
  return ($r, 1);
}


sub DBAddUser { # username, passwd, mail, rank
  return $_[0]->DBExec(q|
    INSERT INTO users
      (username, passwd, mail, rank, registered)
      VALUES (!s, decode(!s, 'hex'), !s, %d, %d)|,
    lc($_[1]), $_[2], $_[3], $_[4], time
  );
}


sub DBUpdateUser { # uid, %options->{ columns in users table }
  my $s = shift;
  my $user = shift;
  my %opt = @_;
  my %h;

  defined $opt{$_} && ($h{$_.' = !s'} = $opt{$_})
    for (qw| username mail |);
  defined $opt{$_} && ($h{$_.' = %d'} = $opt{$_})
    for (qw| rank flags |);
  $h{'passwd = decode(!s, \'hex\')'} = $opt{passwd}
    if defined $opt{passwd};

  return 0 if scalar keys %h <= 0;
  return $s->DBExec(q|
    UPDATE users
      SET !H
      WHERE id = %d|,
    \%h, $user);
}






#-----------------------------------------------------------------------------#
#                                 V O T E S                                   #
#-----------------------------------------------------------------------------#


sub DBGetVotes { # %options->{ uid vid order results page }
  my($s, %o) = @_;
  $o{order} ||= 'n.date DESC';
  $o{results} ||= 50;
  $o{page} ||= 1;

  my %where = (
    $o{uid} ? ( 'n.uid = %d' => $o{uid} ) : (),
    $o{vid} ? ( 'n.vid = %d' => $o{vid} ) : (),
  );

  my $where = scalar keys %where ? 'WHERE !W' : '';
  my $r = $s->DBAll(qq|
    SELECT n.vid, vr.title, n.vote, n.date, n.uid, u.username
      FROM votes n
      JOIN vn v ON v.id = n.vid
      JOIN vn_rev vr ON vr.id = v.latest
      JOIN users u ON u.id = n.uid
      $where
      ORDER BY %s
      LIMIT %d OFFSET %d|,
    $where ? \%where : (),
    $o{order},
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );
  return $r if !wantarray;
  return ($r, 0) if $#$r < $o{results};
  pop @$r;
  return ($r, 1);
}


sub DBVoteStats { # uid|vid => id
  my($s, $col, $id) = @_;
  my $r = [ qw| 0 0 0 0 0 0 0 0 0 0 | ],
  my $where = $col ? 'WHERE '.$col.' = '.$id : '';
  $r->[$_->{vote}-1] = $_->{votes} for (@{$s->DBAll(qq|
    SELECT vote, COUNT(vote) as votes
      FROM votes
      $where
      GROUP BY vote|,
  )});
  return $r;
}


sub DBAddVote { # vid, uid, vote
  $_[0]->DBExec(q|
    UPDATE votes
      SET vote = %d
      WHERE vid = %d
        AND uid = %d|,
    $_[3], $_[1], $_[2]
  ) || $_[0]->DBExec(q|
    INSERT INTO votes
      (vid, uid, vote, date)
      VALUES (%d, %d, %d, %d)|,
    $_[1], $_[2], $_[3], time
  );
  # XXX: performance improvement: let a cron job handle this
  $_[0]->DBExec('SELECT calculate_rating()');
}


sub DBDelVote { # uid, vid  # uid = 0 to delete all
  my $uid = $_[1] ? 'uid = '.$_[1].' AND' : '';
  $_[0]->DBExec(q|
    DELETE FROM votes
      WHERE %s vid = %d|,
    $uid, $_[2]);
  $_[0]->DBExec('SELECT calculate_rating()');
}





#-----------------------------------------------------------------------------#
#              U S E R   V I S U A L   N O V E L   L I S T S                  #
#-----------------------------------------------------------------------------#


sub DBGetVNList { # %options->{ uid vid order results page status }
  my($s, %o) = @_;
  $o{results} ||= 10;
  $o{page} ||= 1;
  $o{order} ||= 'l.date DESC';

  my %where = (
    $o{uid} ? (
      'l.uid = %d' => $o{uid} ) : (),
    $o{vid} ? (
      'l.vid = %d' => $o{vid} ) : (),
    defined $o{status} ? (
      'l.status = %d' => $o{status} ) : (),
  );

  return wantarray ? ([], 0) : [] if !keys %where;

  my $r = $s->DBAll(q|
    SELECT l.vid, vr.title, l.status, l.comments, l.date, l.uid, u.username
      FROM vnlists l
      JOIN vn v ON l.vid = v.id
      JOIN vn_rev vr ON vr.id = v.latest
      JOIN users u ON l.uid = u.id
      WHERE !W
      ORDER BY %s
      LIMIT %d OFFSET %d|,
    \%where,
    $o{order},
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );
  return $r if !wantarray;
  return ($r, 0) if $#$r < $o{results};
  pop @$r;
  return ($r, 1);
}


sub DBVNListStats { # uid|vid => id
  my($s, $col, $id) = @_;
  my $r = [ map 0, 0..$#$VNDB::LSTAT ],
  my $where = $col ? 'WHERE '.$col.' = '.$id : '';
  $r->[$_->{status}] = $_->{cnt} for (@{$s->DBAll(qq|
    SELECT status, COUNT(uid) as cnt
      FROM vnlists
      $where
      GROUP BY status|
  )});
  return $r;
}


sub DBAddVNList { # uid, vid, status, [comments]
  $_[0]->DBExec(q|
    INSERT INTO vnlists (uid, vid, status, date, comments)
      VALUES (!l, !s)|,
    [ @_[1..3], time ],  $_[4]||'');
}


sub DBEditVNList { # %options->{ uid status comments vid }
  my($s, %o) = @_;
  my %set;
  $set{'status = %d'} = $o{status} if defined $o{status};
  $set{'comments = !s'} = $o{comments} if defined $o{comments};
  return if !keys %set;
  $s->DBExec(q|
    UPDATE vnlists
      SET !H
      WHERE uid = %d
        AND vid IN(!l)|,
    \%set, $o{uid}, $o{vid}
  );
}


sub DBDelVNList { # uid, @vid  # uid = 0 to delete all
  my($s, $uid, @vid) = @_;
  $uid = $uid ? 'uid = '.$uid.' AND ' : '';
  $s->DBExec(q|
    DELETE FROM vnlists
      WHERE %s vid IN(!l)|,
    $uid, \@vid
  );
}





#-----------------------------------------------------------------------------#
#                        V I S U A L   N O V E L S                            #
#-----------------------------------------------------------------------------#


sub DBGetVN { # %options->{ id rev char search order results page what cati cate lang }
  my $s = shift;
  my %o = (
    page => 1,
    results => 50,
    order => 'vr.title ASC',
    what => '',
    @_ );

  my %where = (
    !$o{id} && !$o{rev} ? ( # don't fetch hidden items unless we ask for an ID
      'v.hidden = 0' => 1 ) : (),
    $o{id} && !ref($o{id}) ? (
      'v.id = %d' => $o{id} ) : (),
    $o{id} && ref($o{id}) ? (
      'v.id IN(!l)' => $o{id} ) : (),
    $o{rev} ? (
      'vr.id = %d' => $o{rev} ) : (),
    $o{char} ? (
      'LOWER(SUBSTR(vr.title, 1, 1)) = !s' => $o{char} ) : (),
    defined $o{char} && !$o{char} ? (
      '(ASCII(vr.title) < 97 OR ASCII(vr.title) > 122) AND (ASCII(vr.title) < 65 OR ASCII(vr.title) > 90)' => 1 ) : (),
    $o{cati} && @{$o{cati}} ? ( q|
      v.id IN(SELECT iv.id
        FROM vn_categories ivc
        JOIN vn iv ON iv.latest = ivc.vid
        WHERE cat IN(!L)
        GROUP BY iv.id
        HAVING COUNT(cat) = |.($#{$o{cati}}+1).')' => $o{cati} ) : (),
    $o{cate} && @{$o{cate}} ? ( q|
      v.id NOT IN(SELECT iv.id
        FROM vn_categories ivc
        JOIN vn iv ON iv.latest = ivc.vid
        WHERE cat IN(!L)
        GROUP BY iv.id)| => $o{cate} ) : (),
    $o{lang} && @{$o{lang}} ? ( q|
      v.id IN(SELECT irv.vid
        FROM releases_rev irr
        JOIN releases ir ON irr.id = ir.latest
        JOIN releases_vn irv ON irv.rid = irr.id
        WHERE irr.language IN(!L)
          AND irr.type <> 2
          AND irr.released <= TO_CHAR('today'::timestamp, 'YYYYMMDD')::integer)| => $o{lang} ) : (),
  );

  if($o{search}) {
    my %w;
    for (split /[ -,]/, $o{search}) {
      s/%//g;
      next if length($_) < 2;
      $w{ sprintf '(ivr.title ILIKE %s OR ivr.alias ILIKE %1$s OR irr.title ILIKE %1$s OR irr.original ILIKE %1$s)',
        qs('%%'.$_.'%%') } = 1;
    }
    $where{ q|
      v.id IN(SELECT iv.id
        FROM vn iv
        JOIN vn_rev ivr ON iv.latest = ivr.id
        LEFT JOIN releases_vn irv ON irv.vid = iv.id
        LEFT JOIN releases_rev irr ON irr.id = irv.rid
        LEFT JOIN releases ir ON ir.latest = irr.id
        WHERE !W
        GROUP BY iv.id)| } = \%w if keys %w;
  }

  my $where = scalar keys %where ? 'WHERE !W' : '';

  my @join = (
    $o{rev} ?
      'JOIN vn v ON v.id = vr.vid' :
      'JOIN vn v ON vr.id = v.latest',
    $o{what} =~ /changes/ ? (
      'JOIN changes c ON c.id = vr.id',
      'JOIN users u ON u.id = c.requester' ) : (),
  );

  my $sel = 'v.id, v.locked, v.hidden, v.c_released, v.c_languages, v.c_votes, vr.title, vr.id AS cid, v.rgraph';
  $sel .= ', vr.alias, vr.image AS image, vr.img_nsfw, vr.length, vr.desc, vr.l_wp, vr.l_cisv, vr.l_vnn' if $o{what} =~ /extended/;
  $sel .= ', c.added, c.requester, c.comments, v.latest, u.username, c.prev, c.causedby' if $o{what} =~ /changes/;

  my $r = $s->DBAll(qq|
    SELECT $sel
      FROM vn_rev vr
      @join
      $where
      ORDER BY %s
      LIMIT %d OFFSET %d|,
    $where ? \%where : (),
    $o{order},
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );
  $_->{c_released} = sprintf '%08d', $_->{c_released} for @$r;

  if($o{what} =~ /(relations|categories)/ && $#$r >= 0) {
    my %r = map {
      $r->[$_]{relations} = [];
      $r->[$_]{categories} = [];
      ($r->[$_]{cid}, $_)
    } 0..$#$r;
    
    if($o{what} =~ /categories/) {
      push(@{$r->[$r{$_->{vid}}]{categories}}, [ $_->{cat}, $_->{lvl} ]) for (@{$s->DBAll(q|
        SELECT vid, cat, lvl
          FROM vn_categories
          WHERE vid IN(!l)|,
        [ keys %r ]
      )});
    }

    if($o{what} =~ /relations/) {
      my $rel = $s->DBAll(q|
        SELECT rel.vid1, rel.vid2, rel.relation, vr.title
          FROM vn_relations rel
          JOIN vn v ON rel.vid2 = v.id
          JOIN vn_rev vr ON v.latest = vr.id
          WHERE rel.vid1 IN(!l)|,
        [ keys %r ]);
      push(@{$r->[$r{$_->{vid1}}]{relations}}, {
        relation => $_->{relation},
        id => $_->{vid2},
        title => $_->{title}
      }) for (@$rel);
    }
  }

  return $r if !wantarray;
  return ($r, 0) if $#$r != $o{results};
  pop @$r;
  return ($r, 1);
}  


sub DBAddVN { # %options->{ columns in vn_rev + comm + relations }
  my($s, %o) = @_;

  $s->DBExec(q|
    INSERT INTO changes (type, requester, ip, comments)
      VALUES (%d, %d, !s, !s)|,
    0, $s->AuthInfo->{id}, $s->ReqIP, $o{comm});

  my $id = $s->DBLastId('changes');

  $s->DBExec(q|
    INSERT INTO vn (latest)
      VALUES (%d)|, $id);
  my $vid = $s->DBLastId('vn');

  _insert_vn_rev($s, $id, $vid, \%o);

  return ($vid, $id);
}


sub DBEditVN { # id, %options->( columns in vn_rev + comm + relations + categories + uid + causedby }
  my($s, $vid, %o) = @_;

  $s->DBExec(q|
    INSERT INTO changes (type, requester, ip, comments, prev, causedby)
      VALUES (%d, %d, !s, !s, (
        SELECT c.id
        FROM changes c
        JOIN vn_rev vr ON vr.id = c.id
        WHERE vr.vid = %d
        ORDER BY c.id DESC
        LIMIT 1
      ), %d)|,
    0, $o{uid}||$s->AuthInfo->{id}, $s->ReqIP, $o{comm}, $vid, $o{causedby}||0);

  my $id = $s->DBLastId('changes');

  _insert_vn_rev($s, $id, $vid, \%o);

  $s->DBExec(q|UPDATE vn SET latest = %d WHERE id = %d|, $id, $vid);
  return $id;
}


sub _insert_vn_rev {
  my($s, $cid, $vid, $o) = @_;

  $s->DBExec(q|
    INSERT INTO vn_rev (id, vid, title, "desc", alias, image, img_nsfw, length, l_wp, l_cisv, l_vnn)
      VALUES (%d, %d, !s, !s, !s, %d, %d, %d, !s, %d, %d)|,
    $cid, $vid, @$o{qw|title desc alias image img_nsfw length l_wp l_cisv l_vnn|});

  $s->DBExec(q|
    INSERT INTO vn_categories (vid, cat, lvl)
      VALUES (%d, !s, %d)|,
    $cid, $_->[0], $_->[1]
  ) for (@{$o->{categories}});

  $s->DBExec(q|
    INSERT INTO vn_relations (vid1, vid2, relation)
      VALUES (%d, %d, %d)|,
    $cid, $_->[1], $_->[0]
  ) for (@{$o->{relations}});
}


sub DBDelVN { # id
  my($s, $vid) = @_;

 # delete or update relations
  my $rels = $s->DBAll(q|
    SELECT r.id, COUNT(rv2.vid) AS vids
      FROM releases r
      JOIN releases_vn rv ON rv.rid = r.latest
      JOIN releases_vn rv2 ON rv2.rid = r.latest
      WHERE rv.vid = %d
      GROUP BY r.id|,
    $vid
  );
  # delete if no other VN's were found
  $s->DBDelRelease(0, map { $_->{vids} == 1 ? $_->{id} : () } @$rels);
  # remove relation otherwise
  $s->DBExec(q|
    DELETE FROM releases_vn
      WHERE vid = %d|,
    $vid);

  $s->DBExec($_, $vid) for(
    q|DELETE FROM changes c     WHERE c.id IN(SELECT v.id FROM vn_rev v WHERE v.vid = %d)|,
    q|DELETE FROM vn            WHERE id   = %d|,
    q|DELETE FROM vn_categories WHERE vid  IN(SELECT v.id FROM vn_rev v WHERE v.vid = %d)|,
    q|DELETE FROM vn_relations  WHERE vid1 IN(SELECT v.id FROM vn_rev v WHERE v.vid = %d)|,
    q|DELETE FROM vn_rev        WHERE vid  = %d|,
    q|DELETE FROM vn_relations  WHERE vid2 = %d|,
    q|DELETE FROM votes         WHERE vid  = %d|,
    q|DELETE FROM vnlists       WHERE vid  = %d|,
  );
}


sub DBHideVN { # id, hidden
  my($s, $id, $h) = @_;
  $s->DBExec(q|
    UPDATE vn 
      SET hidden = %d
      WHERE id = %d|,
    $h, $id);

#  $s->DBExec(q|
#    DELETE FROM vn_relations
#      WHERE vid2 = %d
#         OR vid1 IN(SELECT id FROM vn_rev WHERE vid = %d)|,
#     $id, $id);
#  $s->DBDelVNList(0, $id);
#  $s->DBDelVote(0, $id);
}


sub DBVNCache { # @vids
  my($s,@vn) = @_;
  $s->DBExec('SELECT update_vncache(%d)', $_) for (@vn);
}


sub DBUndefRG { # ids
  my($s, @id) = @_;
  $s->DBExec(q|
    UPDATE vn
      SET rgraph = 0
      WHERE id IN(!l)|,
    \@id);
}


#-----------------------------------------------------------------------------#
#                              R E L E A S E S                                #
#-----------------------------------------------------------------------------#


sub DBGetRelease { # %options->{ id vid results page rev }
  my($s, %o) = @_;

  $o{results} ||= 50;
  $o{page} ||= 1;
  $o{what} ||= '';
  my %where = (
    !$o{id} && !$o{rev} ? (
      'r.hidden = 0' => 1 ) : (),
    $o{id} ? (
      'r.id = %d' => $o{id} ) : (),
    $o{rev} ? (
      'rr.id = %d' => $o{rev} ) : (),
    $o{vid} ? (
      'rv.vid = %d' => $o{vid} ) : (),
  );

  my $where = scalar keys %where ? 'WHERE !W' : '';
  my @join;
  push @join, $o{rev} ? 'JOIN releases r ON r.id = rr.rid' : 'JOIN releases r ON rr.id = r.latest';
  push @join, 'JOIN changes c ON c.id = rr.id' if $o{what} =~ /changes/;
  push @join, 'JOIN users u ON u.id = c.requester' if $o{what} =~ /changes/;
  push @join, 'JOIN releases_vn rv ON rv.rid = rr.id' if $o{vid};

  my $select = 'r.id, r.locked, r.hidden, rr.id AS cid, rr.title, rr.original, rr.language, rr.website, rr.released, rr.notes, rr.minage, rr.type';
  $select .= ', c.added, c.requester, c.comments, r.latest, u.username, c.prev' if $o{what} =~ /changes/;

  my $r = $s->DBAll(qq|
    SELECT $select
      FROM releases_rev rr
      @join
      $where
      ORDER BY rr.released ASC
      LIMIT %d OFFSET %d|,
    $where ? \%where : (),
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );
  $_->{released} = sprintf '%08d', $_->{released} for @$r;

  if($#$r >= 0 && $o{what} =~ /(vn|producers|platforms|media)/) {
    my %r = map {
      $r->[$_]{producers} = [];
      $r->[$_]{platforms} = [];
      $r->[$_]{media} = [];
      $r->[$_]{vn} = [];
      ($r->[$_]{cid}, $_)
    } 0..$#$r;

    if($o{what} =~ /vn/) {
      push(@{$r->[$r{$_->{rid}}]{vn}}, $_) for (@{$s->DBAll(q|
        SELECT rv.rid, vr.vid, vr.title
          FROM releases_vn rv
          JOIN vn v ON v.id = rv.vid
          JOIN vn_rev vr ON vr.id = v.latest
          WHERE rv.rid IN(!l)|,
        [ keys %r ]
      )});
    }

    if($o{what} =~ /producers/) {
      push(@{$r->[$r{$_->{rid}}]{producers}}, $_) for (@{$s->DBAll(q|
        SELECT rp.rid, p.id, pr.name, pr.type
          FROM releases_producers rp
          JOIN producers p ON rp.pid = p.id
          JOIN producers_rev pr ON pr.id = p.latest
          WHERE rp.rid IN(!l)|,
        [ keys %r ]
      )});
    }
    if($o{what} =~ /platforms/) {
      ($_->{platform}=~s/\s+//||1)&&push(@{$r->[$r{$_->{rid}}]{platforms}}, $_->{platform}) for (@{$s->DBAll(q|
        SELECT rid, platform
          FROM releases_platforms
          WHERE rid IN(!l)|,
        [ keys %r ]
      )});
    }
    if($o{what} =~ /media/) {
      ($_->{medium}=~s/\s+//||1)&&push(@{$r->[$r{$_->{rid}}]{media}}, $_) for (@{$s->DBAll(q|
        SELECT rid, medium, qty
          FROM releases_media
          WHERE rid IN(!l)|,
        [ keys %r ]
      )});
    }
  }
  
  return $r if !wantarray;
  return ($r, 0) if $#$r < $o{results};
  pop @$r;
  return ($r, 1);
}


sub DBAddRelease { # options -> { columns in releases_rev table + comm + vn + producers + media + platforms }
  my($s, %o) = @_;

  $s->DBExec(q|
    INSERT INTO changes (type, requester, ip, comments)
      VALUES (%d, %d, !s, !s)|,
    1, $s->AuthInfo->{id}, $s->ReqIP, $o{comm});

  my $id = $s->DBLastId('changes');
  $s->DBExec(q|
    INSERT INTO releases (latest)
      VALUES (%d)|, $id);
  my $rid = $s->DBLastId('releases');

  _insert_release_rev($s, $id, $rid, \%o);
  return ($rid, $id);
}


sub DBEditRelease { # id, %opts->{ columns in releases_rev table + comm + vn + producers + media + platforms }
  my($s, $rid, %o) = @_;

  $s->DBExec(q|
    INSERT INTO changes (type, requester, ip, comments, prev)
      VALUES (%d, %d, !s, !s, (
        SELECT c.id
        FROM changes c
        JOIN releases_rev rr ON rr.id = c.id
        WHERE rr.rid = %d
        ORDER BY c.id DESC
        LIMIT 1
      ))|,
    1, $s->AuthInfo->{id}, $s->ReqIP, $o{comm}, $rid);

  my $id = $s->DBLastId('changes');

  _insert_release_rev($s, $id, $rid, \%o);

  $s->DBExec(q|UPDATE releases SET latest = %d WHERE id = %d|, $id, $rid);
  return $id;
}


sub _insert_release_rev {
  my($s, $cid, $rid, $o) = @_;

  $s->DBExec(q|
    INSERT INTO releases_rev (id, rid, title, original, language, website, released, notes, minage, type)
      VALUES (%d, %d, !s, !s, !s, !s, %d, !s, %d, %d)|,
    $cid, $rid, @$o{qw| title original language website released notes minage type|});

  $s->DBExec(q|
    INSERT INTO releases_producers (rid, pid)
      VALUES (%d, %d)|,
    $cid, $_
  ) for (@{$o->{producers}});

  $s->DBExec(q|
    INSERT INTO releases_platforms (rid, platform)
      VALUES (%d, !s)|,
    $cid, $_
  ) for (@{$o->{platforms}});

  $s->DBExec(q|
    INSERT INTO releases_vn (rid, vid)
      VALUES (%d, %d)|,
    $cid, $_
  ) for (@{$o->{vn}});

  $s->DBExec(q|
    INSERT INTO releases_media (rid, medium, qty)
      VALUES (%d, !s, %d)|,
    $cid, $_->[0], $_->[1]
  ) for (@{$o->{media}});
}


sub DBDelRelease { # $vns
  my($s, @rid) = @_;
  return if !@rid;
  $s->DBExec($_, \@rid) for(
    q|DELETE FROM changes            WHERE id  IN(SELECT rr.id FROM releases_rev rr WHERE rr.rid IN(!l))|,
    q|DELETE FROM releases_producers WHERE rid IN(SELECT rr.id FROM releases_rev rr WHERE rr.rid IN(!l))|,
    q|DELETE FROM releases_platforms WHERE rid IN(SELECT rr.id FROM releases_rev rr WHERE rr.rid IN(!l))|,
    q|DELETE FROM releases_media     WHERE rid IN(SELECT rr.id FROM releases_rev rr WHERE rr.rid IN(!l))|,
    q|DELETE FROM releases_rev       WHERE rid IN(!l)|,
    q|DELETE FROM releases_vn        WHERE rid IN(!l)|,
    q|DELETE FROM releases           WHERE id  IN(!l)|,
  );
}


sub DBHideRelease { # id, hidden
  my($s, $id, $h) = @_;
  $s->DBExec(q|
    UPDATE releases 
      SET hidden = %d
      WHERE id = %d|,
    $h, $id);
}



#-----------------------------------------------------------------------------#
#                             P R O D U C E R S                               #
#-----------------------------------------------------------------------------#


sub DBGetProducer { # %options->{ id search char results page rev }
  my($s, %o) = @_;

  $o{results} ||= 50;
  $o{page} ||= 1;
  $o{search} =~ s/%//g if $o{search};
  $o{what} ||= '';
  my %where = (
    !$o{id} && !$o{rev} ? (
      'p.hidden = 0' => 1 ) : (),
    $o{id} ? (
      'p.id = %d' => $o{id} ) : (),
    $o{search} ? (
      sprintf('(pr.name ILIKE %s OR pr.original ILIKE %1$s)', qs('%%'.$o{search}.'%%')), 1
    ) : (),
    $o{char} ? (
      'LOWER(SUBSTR(pr.name, 1, 1)) = !s' => $o{char} ) : (),
    defined $o{char} && !$o{char} ? (
      '(ASCII(pr.name) < 97 OR ASCII(pr.name) > 122) AND (ASCII(pr.name) < 65 OR ASCII(pr.name) > 90)' => 1 ) : (),
    $o{rev} ? (
      'pr.id = %d' => $o{rev} ) : (),
  );

  my $where = scalar keys %where ? 'WHERE !W' : '';
  my @join;
  push @join, $o{rev} ? 'JOIN producers p ON p.id = pr.pid' : 'JOIN producers p ON pr.id = p.latest';
  push @join, 'JOIN changes c ON c.id = pr.id' if $o{what} =~ /changes/;
  push @join, 'JOIN users u ON u.id = c.requester' if $o{what} =~ /changes/;

  my $select = 'p.id, p.locked, p.hidden, pr.type, pr.name, pr.original, pr.website, pr.lang, pr.desc';
  $select .= ', c.added, c.requester, c.comments, p.latest, pr.id AS cid, u.username, c.prev' if $o{what} =~ /changes/;

  my $r = $s->DBAll(qq|
    SELECT $select
      FROM producers_rev pr
      @join
      $where
      ORDER BY pr.name ASC
      LIMIT %d OFFSET %d|,
    $where ? \%where : (),
    $o{results}+(wantarray?1:0), $o{results}*($o{page}-1)
  );
  
  return $r if !wantarray;
  return ($r, 0) if $#$r < $o{results};
  pop @$r;
  return ($r, 1);
}


# XXX: This query is killing me!
sub DBGetProducerVN { # pid
  return $_[0]->DBAll(q|
    SELECT v.id, MAX(vr.title) AS title, MIN(rr.released) AS date
      FROM releases_producers vp
      JOIN releases_rev rr ON rr.id = vp.rid
      JOIN releases r ON r.latest = rr.id
      JOIN releases_vn rv ON rv.rid = rr.id
      JOIN vn v ON v.id = rv.vid
      JOIN vn_rev vr ON vr.id = v.latest
      WHERE vp.pid = %d
        AND v.hidden = 0
      GROUP BY v.id
      ORDER BY date|,
    $_[1]);
}


sub DBAddProducer { # %opts->{ columns in producers_rev + comm } 
  my($s, %o) = @_;

  $s->DBExec(q|
    INSERT INTO changes (type, requester, ip, comments)
      VALUES (%d, %d, !s, !s)|,
    2, $s->AuthInfo->{id}, $s->ReqIP, $o{comm});

  my $id = $s->DBLastId('changes');
  $s->DBExec(q|
    INSERT INTO producers (latest)
      VALUES (%d)|, $id);
  my $pid = $s->DBLastId('producers');

  _insert_producer_rev($s, $id, $pid, \%o);

  return ($pid, $id);
}


sub DBEditProducer { # id, %opts->{ columns in producers_rev + comm }
  my($s, $pid, %o) = @_;

  $s->DBExec(q|
    INSERT INTO changes (type, requester, ip, comments, prev)
      VALUES (%d, %d, !s, !s, (
        SELECT c.id
        FROM changes c
        JOIN producers_rev pr ON pr.id = c.id
        WHERE pr.pid = %d
        ORDER BY c.id DESC
        LIMIT 1
      ))|,
    2, $s->AuthInfo->{id}, $s->ReqIP, $o{comm}, $pid);

  my $id = $s->DBLastId('changes');

  _insert_producer_rev($s, $id, $pid, \%o);

  $s->DBExec(q|UPDATE producers SET latest = %d WHERE id = %d|, $id, $pid);
  return $id;
}


sub _insert_producer_rev {
  my($s, $cid, $pid, $o) = @_;
  $s->DBExec(q|
    INSERT INTO producers_rev (id, pid, name, original, website, type, lang, "desc")
      VALUES (%d, %d, !s, !s, !s, !s, !s, !s)|,
    $cid, $pid, @$o{qw| name original website type lang desc|});
}


sub DBDelProducer { # id
  my($s, $pid) = @_;
   $s->DBExec($_, $pid) for (
     q|DELETE FROM changes c          WHERE c.id IN(SELECT p.id FROM producers_rev p WHERE p.pid = %d)|,
     q|DELETE FROM producers_rev      WHERE pid  = %d|,
     q|DELETE FROM releases_producers WHERE pid  = %d|,
     q|DELETE FROM producers          WHERE id   = %d|,
   );
}


sub DBHideProducer { # id, hidden
  my($s, $id, $h) = @_;
  $s->DBExec(q|
    UPDATE producers 
      SET hidden = %d
      WHERE id = %d|,
    $h, $id);
}




#-----------------------------------------------------------------------------#
#                              U T I L I T I E S                              #
#-----------------------------------------------------------------------------#


sub DBExec { return sqlhelper(shift, 0, @_); }
sub DBRow  { return sqlhelper(shift, 1, @_); }
sub DBAll  { return sqlhelper(shift, 2, @_); }


sub DBLastId { # table
  return $_[0]->{_DB}->{sql}->last_insert_id(undef, undef, $_[1], undef);
}


sub sqlhelper { # type, query, @list
  my $self = shift;
  my $type = shift;
  my $sqlq = shift;
  my $s = $self->{_DB}->{sql};

  my $start = [Time::HiRes::gettimeofday()] if $self->{debug};

  $sqlq =~ s/\r?\n/ /g;
  $sqlq =~ s/  +/ /g;
  $sqlq = sqlprint($sqlq, @_) if exists $_[0];
#  warn "$sqlq\n";

  my $q = $s->prepare($sqlq);
  $q->execute();
  my $r = $type == 1 ? $q->fetchrow_hashref :
          $type == 2 ? $q->fetchall_arrayref({}) :
                       $q->rows;
  $q->finish();

  push(@{$self->{_DB}->{Queries}}, [ $sqlq, Time::HiRes::tv_interval($start) ]) if $self->{debug};

  $r = 0  if $type == 0 && !$r;
  $r = {} if $type == 1 && (!$r || ref($r) ne 'HASH');
  $r = [] if $type == 2 && (!$r || ref($r) ne 'ARRAY');

  return $r;
}


# Added features:
#  !s    SQL-quote
#  !l    listify
#  !L    SQL-quote-and-listify
#  !H    list of SET-items: key = format, value = replacement
#  !W    same as !H, but for WHERE clauses
sub sqlprint {
  my $i = -1;
  my @arg;
  my $sq = my $s = shift;
  while($sq =~ s/([%!])(.)//) {
    $i++;
    my $t = $1; my $d = $2;
    if($t eq '%') {
      if($d eq '%') {
        $i--; next 
      }
      $arg[$i] = $_[$i];
      next;
    }
    if($d !~ /[slLHW]/) {
      $i--; next
    }
    $arg[$i] = qs($_[$i]) if $d eq 's';
    $arg[$i] = join(',', @{$_[$i]}) if $d eq 'l';
    $arg[$i] = join(',', (qs(@{$_[$i]}))) if $d eq 'L';
    if($d eq 'H' || $d eq 'W') {
      my @i;
      defined $_[$i]{$_} && push(@i, sqlprint($_, $_[$i]{$_})) for keys %{$_[$i]};
      $arg[$i] = join($d eq 'H' ? ', ' : ' AND ', @i);
    }
  }
  $s =~ s/![sSlLHW]/%s/g;
  $s =~ s/!!/!/g;
  return sprintf($s, @arg);
}


sub qs { # ISO SQL2-quoting, with some PgSQL-specific stuff
  my @r = @_;
  # NOTE: we use E''-style strings because backslash escaping in the normal ''-style
  #       depends on the standard_conforming_strings configuration option of PgSQL,
  #       while E'' will always behave the same regardless of the server configuration.
  for (@r) {
    (!defined $_ or $_ eq '_NULL_') && ($_ = 'NULL') && next;
    s/'/''/g;
    s/\\/\\\\/g;
    $_ = "E'$_'";
  }
  return wantarray ? @r : $r[0];
}


1;