#============================================================= -*-perl-*-
#
# BackupPC::CGI::Check package
#
# DESCRIPTION
#
#   This module implements the Check action for the CGI interface.
#
# AUTHOR
#   Heuze Florent  <heuzef@firewall-services.com>
#
#========================================================================
#
# Released Sept 2019 - firewall-services.com
#
#========================================================================

package BackupPC::CGI::Check;

use strict;
use lib "/usr/share/BackupPC/lib";
use BackupPC::Lib;
use BackupPC::CGI::Lib qw(:all);
use POSIX;
use JSON;
use Getopt::Long;
use Statistics::Descriptive;
use Data::Dumper;

sub action
{
    # Init
    my($fullTot, $fullSizeTot, $incrTot, $incrSizeTot, $str,
       $strNone, $strGood, $hostCntGood, $hostCntNone, $head_content);

    $hostCntGood = $hostCntNone = 0;
    GetStatusInfo("hosts info");
    my $Privileged = CheckPermission();

    # Start loop
    foreach my $host ( GetUserHosts(1) ) {
        my($fullDur, $incrCnt, $incrAge, $fullSize, $fullRate, $reasonHilite,
           $lastAge, $lastAgeColor, $tempState, $tempReason, $lastXferErrors, $lastXferErrorsColor);
        my($shortErr);
        my @Backups = $bpc->BackupInfoRead($host);
        my $fullCnt = $incrCnt = 0;
        my $fullAge = $incrAge = $lastAge = -1;

        $bpc->ConfigRead($host);
        %Conf = $bpc->Conf();

        next if ( $Conf{XferMethod} eq "archive" );
        next if ( !$Privileged && !CheckPermission($host) );

        # Age
        for ( my $i = 0 ; $i < @Backups ; $i++ ) {
            if ( $Backups[$i]{type} eq "full" ) {
                $fullCnt++;
                if ( $fullAge < 0 || $Backups[$i]{startTime} > $fullAge ) {
                    $fullAge  = $Backups[$i]{startTime};
                    $fullSize = $Backups[$i]{size} / (1024 * 1024);
                    $fullDur  = $Backups[$i]{endTime} - $Backups[$i]{startTime};
                }
                $fullSizeTot += $Backups[$i]{size} / (1024 * 1024);
            } elsif ( $Backups[$i]{type} eq "incr" ) {
                $incrCnt++;
                if ( $incrAge < 0 || $Backups[$i]{startTime} > $incrAge ) {
                    $incrAge = $Backups[$i]{startTime};
                }
                $incrSizeTot += $Backups[$i]{size} / (1024 * 1024);
            }
        }
        if ( $fullAge > $incrAge && $fullAge >= 0 )  {
            $lastAge = $fullAge;
        } else {
            $lastAge = $incrAge;
        }
        if ( $lastAge < 0 ) {
            $lastAge = "";
        } else {
            $lastAge = sprintf("%.1f", (time - $lastAge) / (24 * 3600));
        }
        # Color for age
        if ( $lastAge < 1.1 ) {
            $lastAgeColor = "MediumSeaGreen";
        } else {
          $lastAgeColor = "Tomato";
        }
        if ( $fullAge < 0 ) {
            $fullAge = "";
            $fullRate = "";
        } else {
            $fullAge = sprintf("%.1f", (time - $fullAge) / (24 * 3600));
            $fullRate = sprintf("%.2f",
                                $fullSize / ($fullDur <= 0 ? 1 : $fullDur));
        }
        if ( $incrAge < 0 ) {
            $incrAge = "";
        } else {
            $incrAge = sprintf("%.1f", (time - $incrAge) / (24 * 3600));
        }
        $fullTot += $fullCnt;
        $incrTot += $incrCnt;
        $fullSize = sprintf("%.2f", $fullSize / 1024);
        $incrAge = "&nbsp;" if ( $incrAge eq "" );
        # Color for errors
        $lastXferErrors = $Backups[@Backups-1]{xferErrs} if ( @Backups );
        if ( $lastXferErrors == 0 ) {
            $lastXferErrorsColor = "MediumSeaGreen";
        } else {
          $lastAgeColor = "Tomato";
        }

        $reasonHilite = $Conf{CgiStatusHilightColor}{$Status{$host}{reason}} || $Conf{CgiStatusHilightColor}{$Status{$host}{state}};

# If Backup is disable
if ( $Conf{BackupsDisable} == 1 ) {
            if ( $Status{$host}{state} ne "Status_backup_in_progress"
                    && $Status{$host}{state} ne "Status_restore_in_progress" ) {
                $reasonHilite = $Conf{CgiStatusHilightColor}{Disabled_OnlyManualBackups};
                $tempState = "Disabled_OnlyManualBackups";
                $tempReason = "";
            } else {
                $tempState = $Status{$host}{state};
                $tempReason = $Status{$host}{reason};
            }
	} elsif ($Conf{BackupsDisable} == 2 ) {
	    $reasonHilite = $Conf{CgiStatusHilightColor}{Disabled_AllBackupsDisabled};
	    $tempState = "Disabled_AllBackupsDisabled";
	    $tempReason = "";
	} else {
	    $tempState = $Status{$host}{state};
	    $tempReason = $Status{$host}{reason};
	}
	$reasonHilite = " bgcolor=\"$reasonHilite\"" if ( $reasonHilite ne "" );
        if ( $tempState ne "Status_backup_in_progress"
		&& $tempState ne "Status_restore_in_progress"
		&& $Conf{BackupsDisable} == 0
		&& $Status{$host}{error} ne "" ) {
	    ($shortErr = $Status{$host}{error}) =~ s/(.{48}).*/$1.../;
	    $shortErr = " ($shortErr)";
	}

# Check Size Consistency
my $bpc = BackupPC::Lib->new();
my $mainConf = $bpc->ConfigDataRead();
my $json = {};

if ( $host ) {
  my $hostConf = $bpc->ConfigDataRead($host);
  my $conf = { %$mainConf, %$hostConf };
  my $age = -1;
  $json = {
    bkp             => 0,
    last_age        => 0,
    errors          => 0,
    new_size        => 0,
    new_size_avg    => 0,
    new_size_median => 0,
    new_size_q1     => 0,
    new_size_q3     => 0
  };

  my @bpc_info              = $bpc->BackupInfoRead($host);
  my $sizes                 = new Statistics::Descriptive::Full;

  if ( scalar( @bpc_info ) ){
    foreach my $backup ( @bpc_info ) {
      # Skip partial or active backups
      next if ( $backup->{type} !~ m/^full|incr$/ );
      # Push all the sizes in our data set to compute avg sizes
      # Exclude backup N°0 as it'll always have much more new data than normal backups
      $sizes->add_data($backup->{sizeNew}) unless ( $backup->{num} == 0 );
      $json->{bkp}++;
    }

    # Ignore the last backup if it's not full or incr (which means it's either partial or active)
    my $i = ( $bpc_info[-1]->{type} =~ m/^full|incr$/ ) ? -1 : -2;

    $json->{errors}           = $bpc_info[$i]->{xferErrs};
    $json->{new_size}         = $bpc_info[$i]->{sizeNew};
    $json->{new_size_avg}     = int $sizes->mean;
    $json->{new_size_median}  = int $sizes->median;
    $json->{new_size_q1}      = eval { int $sizes->quantile(1) } || 0;
    $json->{new_size_q3}      = eval { int $sizes->quantile(3) } || 0;
    $json->{age}              = time - $bpc_info[$i]->{startTime};
    $json->{last_age}         = sprintf("%.1f", ($json->{age}) / 84600);
  }
}

# TOO BIG ?
my $toobig = "1";
if ( $json->{new_size} > ($json->{new_size_q3} + $json->{new_size_q3} - $json->{new_size_q1}) * 1.5 or $json->{new_size} > $json->{new_size_avg} * 6 ) {
  $toobig = "1";
  }
else {
  $toobig = "0";
}

# TOO SMALL ?
my $toosmall = "1";
if ( $json->{new_size} < ($json->{new_size_q1} - $json->{new_size_q3} - $json->{new_size_q1}) * 1.5 or $json->{new_size} < $json->{new_size_avg} / 3 ) {
  $toosmall = "1";
  }
else {
  $toosmall = "0";
}

my $sizeConsistency = "<strong>ANOMALOUS</strong>";
my $sizeConsistencyColor = "Tomato";

# Get result
if ( $toobig or $toosmall ) {
  $sizeConsistency = "<strong>ANOMALOUS</strong>";
  $sizeConsistencyColor = "Tomato";
  }
else {
  $sizeConsistency = "Normal";
  $sizeConsistencyColor = "MediumSeaGreen";
}

# Get random file
my $browseFile = "?action=browse&host=$host";

# Show summary
        $str = <<EOF;
<tr$reasonHilite><td class="border">${HostLink($host)}</td>
    <td align="center" class="border" style="color:$lastAgeColor;">$lastAge</td>
    <td align="center" class="border" style="color:$lastXferErrorsColor;">$lastXferErrors</td>
    <td align="center" class="border" style="color:$sizeConsistencyColor;">$sizeConsistency</td>
    <td align="center" class="border"><a href="$browseFile" target="_blank">Explore files ...</a></td>
EOF

        # Increment counter
        if ( @Backups == 0 ) {
            $hostCntNone++;
            $strNone .= $str;
        } else {
            $hostCntGood++;
            $strGood .= $str;
        }
    }
    # End loop

    # Time set
    $fullSizeTot       = sprintf("%.2f", $fullSizeTot / 1024);
    $incrSizeTot       = sprintf("%.2f", $incrSizeTot / 1024);
    my $now            = timeStamp2(time);
    my $DUlastTime     = timeStamp2($Info{DUlastValueTime});
    my $DUmaxTime      = timeStamp2($Info{DUDailyMaxTime});
    my $DUInodemaxTime = timeStamp2($Info{DUInodeDailyMaxTime});

    # Show header
            $head_content = <<EOF;
New header content
EOF

    my $header = eval ("qq{$head_content}");
    my $content = eval ("qq{$Lang->{BackupPC_Check}}");
    Header("BackupPC: Check", $content, $header);
    Trailer();
}

1;