#!/usr/bin/perl -w

use strict;
use vars qw( $opt_d $opt_s $opt_q $opt_v $opt_r $opt_c $opt_j $opt_a );
use vars qw( $DEBUG $DRY_RUN );
use Getopt::Std;
use DBD::Pg qw(:async); #for -a
use DBIx::DBSchema 0.46;
use FS::UID qw(adminsuidsetup checkeuid datasrc driver_name);
use FS::CurrentUser;
use FS::Schema qw( dbdef dbdef_dist reload_dbdef );
use FS::Misc::prune qw(prune_applications);
use FS::Conf;
use FS::Record qw(qsearch);
use FS::Upgrade qw(upgrade_schema upgrade_config upgrade upgrade_sqlradius);

my $start = time;

die "Not running uid freeside!" unless checkeuid();

getopts("dqrcsja");

$DEBUG = !$opt_q;
#$DEBUG = $opt_v;

$DRY_RUN = $opt_d;

my $user = shift or die &usage;
$FS::CurrentUser::upgrade_hack = 1;
$FS::UID::callback_hack = 1;
my $dbh = adminsuidsetup($user);
$FS::UID::callback_hack = 0;

# pass command line opts through to upgrade* routines
my %upgrade_opts = (
  quiet   => $opt_q,
  verbose => $opt_v,
  queue   => $opt_j,
  # others?
);

if ( driver_name =~ /^mysql/i ) { #until 0.39 is required above
  eval "use DBIx::DBSchema 0.39;";
  die $@ if $@;
}

#needs to match FS::Schema...
my $dbdef_file = "%%%FREESIDE_CONF%%%/dbdef.". datasrc;

dbdef_create($dbh, $dbdef_file);

delete $FS::Schema::dbdef_cache{$dbdef_file}; #force an actual reload
reload_dbdef($dbdef_file);

warn "Upgrade startup completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

#$DBIx::DBSchema::DEBUG = $DEBUG;
#$DBIx::DBSchema::Table::DEBUG = $DEBUG;
#$DBIx::DBSchema::Index::DEBUG = $DEBUG;

my @bugfix = ();

if ( $DRY_RUN ) {
  print join(";\n", @bugfix ). ";\n";
} else {
  foreach my $statement ( @bugfix ) {
    warn "$statement\n";
    $dbh->do( $statement )
      or die "Error: ". $dbh->errstr. "\n executing: $statement";
  }
}

###
# Fixes before schema upgrade
###
# this isn't actually the main schema upgrade, this calls _upgrade_schema
# in any class that has it
if ( $DRY_RUN ) {
  #XXX no dry run for upgrade_schema stuff yet.
  # looking at the code some are a mix of SQL statements and our methods, icky.
  # its not like dry run is 100% anyway, all sort of other later upgrade tasks
  # aren't printed either
} else {
  upgrade_schema(%upgrade_opts);

  dbdef_create($dbh, $dbdef_file);
  delete $FS::Schema::dbdef_cache{$dbdef_file}; #force an actual reload
  reload_dbdef($dbdef_file);
}

###
# Now here is the main/automatic schema upgrade via DBIx::DBSchema
###

my $conf = new FS::Conf;

my $dbdef_dist = dbdef_dist(
  datasrc,
  { 'queue-no_history' => $conf->exists('queue-no_history') },
);

my @statements = dbdef->sql_update_schema( $dbdef_dist,
                                           $dbh,
                                           { 'nullify_default' => 1, },
                                         );

###
# New custom fields
###
# 1. prevent new custom field columns from being dropped by upgrade
# 2. migrate old virtual fields to real fields (new custom fields)

my $cfsth = $dbh->prepare("SELECT * FROM part_virtual_field") 
                                                         or die $dbh->errstr;
$cfsth->execute or die $cfsth->errstr;
my $cf; 
while ( $cf = $cfsth->fetchrow_hashref ) {
    my $tbl = $cf->{'dbtable'};
    my $name = $cf->{'name'};
    $name = lc($name) unless driver_name =~ /^mysql/i;

    @statements = grep { $_ !~ /^\s*ALTER\s+TABLE\s+(h_|)$tbl DROP\s+COLUMN\s+cf_$name/i }
                                                                    @statements;
    push @statements, 
        "ALTER TABLE $tbl ADD COLUMN cf_$name varchar(".$cf->{'length'}.")"
     unless (dbdef->table($tbl) && dbdef->table($tbl)->column("cf_$name"));
    push @statements, 
        "ALTER TABLE h_$tbl ADD COLUMN cf_$name varchar(".$cf->{'length'}.")"
     unless (dbdef->table("h_$tbl") && dbdef->table("h_$tbl")->column("cf_$name"));
}
warn "Custom fields schema upgrade completed";

###
# Other stuff
###

@statements = 
  grep { $_ !~ /^CREATE +INDEX +h_queue/i } #useless, holds up queue insertion
       @statements;

unless ( driver_name =~ /^mysql/i ) {
  #not necessary under non-mysql, takes forever on big db
  @statements =
    grep { $_ !~ /^ *ALTER +TABLE +h_queue +ALTER +COLUMN +job +TYPE +varchar\(512\) *$/i }
         @statements;
}

if ( $opt_c ) {

  #can always add it back for 4.x->4.x if we need it
  die "FATAL: -c removed: cdr / h_cdr upgrade is required for 4.x\n";

  @statements =
    grep { $_ !~ /^ *ALTER +TABLE +(h_)?cdr /i }
         @statements;

  @statements =
    grep { $_ !~ /^ *CREATE +INDEX +(h_)?cdr\d+ /i }
         @statements;

}


###
# Now run the @statements
###

if ( $DRY_RUN ) {
  print
    join(";\n", @statements ). ";\n";
  exit;
} elsif ( $opt_a ) {

  ###
  # -a: Run schema changes in parallel (Pg only).
  ###

  my $MAX_HANDLES; # undef for now, set it if you want a limit

  my @phases = map { [] } 0..4;
  my $fsupgrade_idx = 1;
  my %idx_map;
  foreach (@statements) {
    if ( /^ *(CREATE|ALTER) +TABLE/ ) {
      # phase 0: CREATE TABLE, ALTER TABLE
      push @{ $phases[0] }, $_;
    } elsif ( /^ *ALTER +INDEX.* RENAME TO dbs_temp(\d+)/ ) {
      # phase 1: rename index to dbs_temp%d
      # (see DBIx::DBSchema::Table)
      # but in this case, uniqueify all the dbs_temps.  This method only works
      # because they are in the right order to begin with...
      my $dbstemp_idx = $1;
      s/dbs_temp$dbstemp_idx/fsupgrade_temp$fsupgrade_idx/;
      $idx_map{ $dbstemp_idx } = $fsupgrade_idx;
      push @{ $phases[1] }, $_;
      $fsupgrade_idx++;
    } elsif ( /^ *(CREATE|DROP)( +UNIQUE)? +INDEX/ ) {
      # phase 2: create/drop indices
      push @{ $phases[2] }, $_;
    } elsif ( /^ *ALTER +INDEX +dbs_temp(\d+) +RENAME/ ) {
      # phase 3: rename temp indices back to real ones
      my $dbstemp_idx = $1;
      my $mapped_idx = $idx_map{ $dbstemp_idx }
        or die "unable to remap dbs_temp$1 RENAME statement";
      s/dbs_temp$dbstemp_idx/fsupgrade_temp$mapped_idx/;
      push @{ $phases[3] }, $_;
    } else {
      # phase 4: everything else (CREATE SEQUENCE, SELECT SETVAL, etc.)
      push @{ $phases[4] }, $_;
    }
  }
  my $i = 0;
  my @busy = ();
  my @free = ();
  foreach my $phase (@phases) {
    warn "Starting schema changes, phase $i...\n";
    while (@$phase or @busy) {
      # check status of all running tasks
      my @newbusy;
      my $failed_clone;
      for my $clone (@busy) {
        if ( $clone->pg_ready ) {
          # then clean it up
          my $rv = $clone->pg_result && $clone->commit;
          $failed_clone = $clone if !$rv;
          push @free, $clone;
        } else {
          push @newbusy, $clone;
        }
      }
      if ( $failed_clone ) {
        my $errstr = $failed_clone->errstr;
        foreach my $clone (@newbusy, $failed_clone) {
          $clone->pg_cancel if $clone->{pg_async_status} == 1;
          $clone->disconnect;
        }
        die "$errstr\n";
      }
      @busy = @newbusy;
      if (my $statement = $phase->[0]) {
        my $clone;
        if ( @free ) {
          $clone = shift(@free);
        } elsif ( !$MAX_HANDLES or 
                  scalar(@free) + scalar(@busy) < $MAX_HANDLES ) {
          $clone = $dbh->clone; # this will fail if over the server limit
        }

        if ( $clone ) {
          my $rv = $clone->do($statement, {pg_async => PG_ASYNC});
          if ( $rv ) {
            warn "$statement\n";
            shift @{ $phase }; # and actually take the statement off the queue
            push @busy, $clone;
          } # else I don't know, wait and retry
        } # else too many handles, wait and retry
      } elsif (@busy) {
        # all statements are dispatched
        warn "Waiting for phase $i to complete\n";
        sleep 30;
      }
    } # while @$phase or @busy
    $i++;
  } # foreach $phase
  warn "Schema changes complete.\n";

#  warn "Pre-schema change upgrades completed in ". (time-$start). " seconds\n"; # if $DEBUG;
#  $start = time;

#  dbdef->update_schema( dbdef_dist(datasrc), $dbh );

} else {

  ###
  # normal case, run statements sequentially
  ###

  foreach my $statement ( @statements ) {
    warn "$statement\n";
    $dbh->do( $statement )
      or die "Error: ". $dbh->errstr. "\n executing: $statement";
  }
}

warn "Schema upgrade completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

my $hashref = {};
$hashref->{dry_run} = 1 if $DRY_RUN;
$hashref->{debug} = 1 if $DEBUG && $DRY_RUN;
prune_applications($hashref) unless $opt_s;

warn "Application pruning completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

print "\n" if $DRY_RUN;

if ( $dbh->{Driver}->{Name} =~ /^mysql/i && ! $opt_s ) {

  foreach my $table (qw( svc_acct svc_phone cust_main_county )) {

    my $sth = $dbh->prepare(
      "SELECT COUNT(*) FROM duplicate_lock WHERE lockname = '$table'"
    ) or die $dbh->errstr;

    $sth->execute or die $sth->errstr;

    unless ( $sth->fetchrow_arrayref->[0] ) {

      $sth = $dbh->prepare(
        "INSERT INTO duplicate_lock ( lockname ) VALUES ( '$table' )"
      ) or die $dbh->errstr;

      $sth->execute or die $sth->errstr;

    }

  }

  warn "Duplication lock creation completed in ". (time-$start). " seconds\n"; # if $DEBUG;
  $start = time;

}

$dbh->commit or die $dbh->errstr;

dbdef_create($dbh, $dbdef_file);

$dbh->disconnect or die $dbh->errstr;

delete $FS::Schema::dbdef_cache{$dbdef_file}; #force an actual reload
$FS::UID::AutoCommit = 0;
$FS::UID::callback_hack = 1;
$dbh = adminsuidsetup($user);
$FS::UID::callback_hack = 0;
unless ( $DRY_RUN || $opt_s ) {
  my $dir = "%%%FREESIDE_CONF%%%/conf.". datasrc;
  if (!scalar(qsearch('conf', {}))) {
    my $error = FS::Conf::init_config($dir);
    if ($error) {
      warn "CONFIGURATION UPGRADE FAILED\n";
      $dbh->rollback or die $dbh->errstr;
      die $error;
    }
  }
}
$dbh->commit or die $dbh->errstr;
$dbh->disconnect or die $dbh->errstr;

$FS::UID::AutoCommit = 1;

$dbh = adminsuidsetup($user);

warn "Re-initialization with updated schema completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

#### NEW CUSTOM FIELDS:
# 3. migrate old virtual field data to the new custom fields
####
$cfsth = $dbh->prepare("SELECT * FROM virtual_field left join part_virtual_field using (vfieldpart)")
                                                         or die $dbh->errstr;
$cfsth->execute or die $cfsth->errstr;
my @cfst;
while ( $cf = $cfsth->fetchrow_hashref ) {
    my $tbl = $cf->{'dbtable'};
    my $name = $cf->{'name'};
    my $dtable = dbdef->table($tbl);
    next unless $dtable && $dtable->primary_key; # XXX: warn first?
    my $pkey = $dtable->primary_key;
    next unless $dtable->column($pkey)->type =~ /int/i; # XXX: warn first?
    push @cfst, "UPDATE $tbl set cf_$name = '".$cf->{'value'}."' WHERE $pkey = ".$cf->{'recnum'};
    push @cfst, "DELETE FROM virtual_field WHERE vfieldnum = ".$cf->{'vfieldnum'};
}
foreach my $cfst ( @cfst ) {
    warn "$cfst\n";
    $dbh->do( $cfst )
      or die "Error: ". $dbh->errstr. "\n executing: $cfst";
}
warn "Custom fields data upgrade completed";

upgrade_config(%upgrade_opts)
  unless $DRY_RUN || $opt_s;

$dbh->commit or die $dbh->errstr;

warn "Config updates completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

upgrade(%upgrade_opts)
  unless $DRY_RUN || $opt_s;

$dbh->commit or die $dbh->errstr;

warn "Table updates completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

upgrade_sqlradius(%upgrade_opts)
  unless $DRY_RUN || $opt_s || $opt_r;

warn "SQL RADIUS updates completed in ". (time-$start). " seconds\n"; # if $DEBUG;
$start = time;

$dbh->commit or die $dbh->errstr;
$dbh->disconnect or die $dbh->errstr;

warn "Final commit and disconnection completed in ". (time-$start). " seconds; upgrade done!\n"; # if $DEBUG;

###

sub dbdef_create { # reverse engineer the schema from the DB and save to file
  my( $dbh, $file ) = @_;
  my $dbdef = new_native DBIx::DBSchema $dbh;
  $dbdef->save($file);
}

sub usage {
  die "Usage:\n  freeside-upgrade [ -d ] [ -q | -v ] [ -r ] [ -s ] [ -j ] [ -a ] user\n"; 
}

=head1 NAME

freeside-upgrade - Upgrades database schema for new freeside verisons.

=head1 SYNOPSIS

  freeside-upgrade [ -d ] [ -q | -v ] [ -r ] [ -s ] [ -j ] [ -a ]

=head1 DESCRIPTION

Reads your existing database schema and updates it to match the current schema,
adding any columns or tables necessary.

Also performs other upgrade functions:

=over 4

=item Calls FS:: Misc::prune::prune_applications (probably unnecessary every upgrade, but simply won't find any records to change)

=item If necessary, moves your configuration information from the filesystem in /usr/local/etc/freeside/conf.<datasrc> to the database.

=back

  [ -d ]: Dry run; output SQL statements (to STDOUT) only, but do not execute
          them.

  [ -q ]: Run quietly.  This may become the default at some point.

  [ -v ]: Run verbosely, sending debugging information to STDERR.  This is the
          current default.

  [ -s ]: Schema changes only.  Used to be useful for Pg/slony slaves where the
          data changes would be replicated from the Pg/slony master (current
          native Pg replication replicates schema changes to slaves
          automatically).

  [ -r ]: Skip sqlradius updates.  Useful for occassions where the sqlradius
          databases may be inaccessible.

  [ -j ]: Run certain upgrades asychronously from the job queue.  Recommended
          for very large cust_main or part_pkg tables that take too long to
          upgrade.

  [ -a ]: Run schema changes in parallel (Pg only).  DBIx::DBSchema minimum 
          version 0.41 recommended.  Recommended only for large databases and
          powerful database servers, to reduce upgrade time.

=head1 SEE ALSO

=cut