package FS::cust_pay;

use strict;
use vars qw( @ISA $DEBUG $me $conf @encrypted_fields
             $unsuspendauto $ignore_noapply 
           );
use Date::Format;
use Business::CreditCard;
use Text::Template;
use FS::UID qw( getotaker );
use FS::Misc qw( send_email );
use FS::Record qw( dbh qsearch qsearchs );
use FS::payby;
use FS::cust_main_Mixin;
use FS::payinfo_transaction_Mixin;
use FS::cust_bill;
use FS::cust_bill_pay;
use FS::cust_pay_refund;
use FS::cust_main;
use FS::cust_pkg;
use FS::cust_pay_void;

@ISA = qw( FS::payinfo_transaction_Mixin FS::cust_main_Mixin FS::Record );

$DEBUG = 1;

$me = '[FS::cust_pay]';

$ignore_noapply = 0;

#ask FS::UID to run this stuff for us later
FS::UID->install_callback( sub { 
  $conf = new FS::Conf;
  $unsuspendauto = $conf->exists('unsuspendauto');
} );

@encrypted_fields = ('payinfo');

=head1 NAME

FS::cust_pay - Object methods for cust_pay objects

=head1 SYNOPSIS

  use FS::cust_pay;

  $record = new FS::cust_pay \%hash;
  $record = new FS::cust_pay { 'column' => 'value' };

  $error = $record->insert;

  $error = $new_record->replace($old_record);

  $error = $record->delete;

  $error = $record->check;

=head1 DESCRIPTION

An FS::cust_pay object represents a payment; the transfer of money from a
customer.  FS::cust_pay inherits from FS::Record.  The following fields are
currently supported:

=over 4

=item paynum

primary key (assigned automatically for new payments)

=item custnum

customer (see L<FS::cust_main>)

=item _date

specified as a UNIX timestamp; see L<perlfunc/"time">.  Also see
L<Time::Local> and L<Date::Parse> for conversion functions.

=item paid

Amount of this payment

=item otaker

order taker (assigned automatically, see L<FS::UID>)

=item payby

Payment Type (See L<FS::payinfo_Mixin> for valid payby values)

=item payinfo

Payment Information (See L<FS::payinfo_Mixin> for data format)

=item paymask

Masked payinfo (See L<FS::payinfo_Mixin> for how this works)

=item paybatch

text field for tracking card processing or other batch grouping

=item payunique

Optional unique identifer to prevent duplicate transactions.

=item closed

books closed flag, empty or `Y'

=item pkgnum

Desired pkgnum when using experimental package balances.

=back

=head1 METHODS

=over 4 

=item new HASHREF

Creates a new payment.  To add the payment to the databse, see L<"insert">.

=cut

sub table { 'cust_pay'; }
sub cust_linked { $_[0]->cust_main_custnum; } 
sub cust_unlinked_msg {
  my $self = shift;
  "WARNING: can't find cust_main.custnum ". $self->custnum.
  ' (cust_pay.paynum '. $self->paynum. ')';
}

=item insert [ OPTION => VALUE ... ]

Adds this payment to the database.

For backwards-compatibility and convenience, if the additional field invnum
is defined, an FS::cust_bill_pay record for the full amount of the payment
will be created.  In this case, custnum is optional.

A hash of optional arguments may be passed.  Currently "manual" is supported.
If true, a payment receipt is sent instead of a statement when
'payment_receipt_email' configuration option is set.

=cut

sub insert {
  my($self, %options) = @_;

  local $SIG{HUP} = 'IGNORE';
  local $SIG{INT} = 'IGNORE';
  local $SIG{QUIT} = 'IGNORE';
  local $SIG{TERM} = 'IGNORE';
  local $SIG{TSTP} = 'IGNORE';
  local $SIG{PIPE} = 'IGNORE';

  my $oldAutoCommit = $FS::UID::AutoCommit;
  local $FS::UID::AutoCommit = 0;
  my $dbh = dbh;

  my $cust_bill;
  if ( $self->invnum ) {
    $cust_bill = qsearchs('cust_bill', { 'invnum' => $self->invnum } )
      or do {
        $dbh->rollback if $oldAutoCommit;
        return "Unknown cust_bill.invnum: ". $self->invnum;
      };
    $self->custnum($cust_bill->custnum );
  }

  my $error = $self->check;
  return $error if $error;

  my $cust_main = $self->cust_main;
  my $old_balance = $cust_main->balance;

  $error = $self->SUPER::insert;
  if ( $error ) {
    $dbh->rollback if $oldAutoCommit;
    return "error inserting $self: $error";
  }

  if ( $self->invnum ) {
    my $cust_bill_pay = new FS::cust_bill_pay {
      'invnum' => $self->invnum,
      'paynum' => $self->paynum,
      'amount' => $self->paid,
      '_date'  => $self->_date,
    };
    $error = $cust_bill_pay->insert(%options);
    if ( $error ) {
      if ( $ignore_noapply ) {
        warn "warning: error inserting $cust_bill_pay: $error ".
             "(ignore_noapply flag set; inserting cust_pay record anyway)\n";
      } else {
        $dbh->rollback if $oldAutoCommit;
        return "error inserting $cust_bill_pay: $error";
      }
    }
  }

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

  #false laziness w/ cust_credit::insert
  if ( $unsuspendauto && $old_balance && $cust_main->balance <= 0 ) {
    my @errors = $cust_main->unsuspend;
    #return 
    # side-fx with nested transactions?  upstack rolls back?
    warn "WARNING:Errors unsuspending customer ". $cust_main->custnum. ": ".
         join(' / ', @errors)
      if @errors;
  }
  #eslaf

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

  #payment receipt
  my $trigger = $conf->config('payment_receipt-trigger') || 'cust_pay';
  if ( $trigger eq 'cust_pay' ) {
    my $error = $self->send_receipt(
      'manual'    => $options{'manual'},
      'cust_bill' => $cust_bill,
      'cust_main' => $cust_main,
    );
    warn "can't send payment receipt/statement: $error" if $error;
  }

  '';

}

=item void [ REASON ]

Voids this payment: deletes the payment and all associated applications and
adds a record of the voided payment to the FS::cust_pay_void table.

=cut

sub void {
  my $self = shift;

  local $SIG{HUP} = 'IGNORE';
  local $SIG{INT} = 'IGNORE';
  local $SIG{QUIT} = 'IGNORE';
  local $SIG{TERM} = 'IGNORE';
  local $SIG{TSTP} = 'IGNORE';
  local $SIG{PIPE} = 'IGNORE';

  my $oldAutoCommit = $FS::UID::AutoCommit;
  local $FS::UID::AutoCommit = 0;
  my $dbh = dbh;

  my $cust_pay_void = new FS::cust_pay_void ( {
    map { $_ => $self->get($_) } $self->fields
  } );
  $cust_pay_void->reason(shift) if scalar(@_);
  my $error = $cust_pay_void->insert;
  if ( $error ) {
    $dbh->rollback if $oldAutoCommit;
    return $error;
  }

  $error = $self->delete;
  if ( $error ) {
    $dbh->rollback if $oldAutoCommit;
    return $error;
  }

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

  '';

}

=item delete

Unless the closed flag is set, deletes this payment and all associated
applications (see L<FS::cust_bill_pay> and L<FS::cust_pay_refund>).  In most
cases, you want to use the void method instead to leave a record of the
deleted payment.

=cut

# very similar to FS::cust_credit::delete
sub delete {
  my $self = shift;
  return "Can't delete closed payment" if $self->closed =~ /^Y/i;

  local $SIG{HUP} = 'IGNORE';
  local $SIG{INT} = 'IGNORE';
  local $SIG{QUIT} = 'IGNORE';
  local $SIG{TERM} = 'IGNORE';
  local $SIG{TSTP} = 'IGNORE';
  local $SIG{PIPE} = 'IGNORE';

  my $oldAutoCommit = $FS::UID::AutoCommit;
  local $FS::UID::AutoCommit = 0;
  my $dbh = dbh;

  foreach my $app ( $self->cust_bill_pay, $self->cust_pay_refund ) {
    my $error = $app->delete;
    if ( $error ) {
      $dbh->rollback if $oldAutoCommit;
      return $error;
    }
  }

  my $error = $self->SUPER::delete(@_);
  if ( $error ) {
    $dbh->rollback if $oldAutoCommit;
    return $error;
  }

  if (    $conf->exists('deletepayments')
       && $conf->config('deletepayments') ne '' ) {

    my $cust_main = $self->cust_main;

    my $error = send_email(
      'from'    => $conf->config('invoice_from', $self->cust_main->agentnum),
                                 #invoice_from??? well as good as any
      'to'      => $conf->config('deletepayments'),
      'subject' => 'FREESIDE NOTIFICATION: Payment deleted',
      'body'    => [
        "This is an automatic message from your Freeside installation\n",
        "informing you that the following payment has been deleted:\n",
        "\n",
        'paynum: '. $self->paynum. "\n",
        'custnum: '. $self->custnum.
          " (". $cust_main->last. ", ". $cust_main->first. ")\n",
        'paid: $'. sprintf("%.2f", $self->paid). "\n",
        'date: '. time2str("%a %b %e %T %Y", $self->_date). "\n",
        'payby: '. $self->payby. "\n",
        'payinfo: '. $self->paymask. "\n",
        'paybatch: '. $self->paybatch. "\n",
      ],
    );

    if ( $error ) {
      $dbh->rollback if $oldAutoCommit;
      return "can't send payment deletion notification: $error";
    }

  }

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

  '';

}

=item replace OLD_RECORD

You can, but probably shouldn't modify payments...

=cut

sub replace {
  #return "Can't modify payment!"
  my $self = shift;
  return "Can't modify closed payment" if $self->closed =~ /^Y/i;
  $self->SUPER::replace(@_);
}

=item check

Checks all fields to make sure this is a valid payment.  If there is an error,
returns the error, otherwise returns false.  Called by the insert method.

=cut

sub check {
  my $self = shift;

  $self->otaker(getotaker) unless ($self->otaker);

  my $error =
    $self->ut_numbern('paynum')
    || $self->ut_numbern('custnum')
    || $self->ut_numbern('_date')
    || $self->ut_money('paid')
    || $self->ut_alpha('otaker')
    || $self->ut_textn('paybatch')
    || $self->ut_textn('payunique')
    || $self->ut_enum('closed', [ '', 'Y' ])
    || $self->ut_foreign_keyn('pkgnum', 'cust_pkg', 'pkgnum')
    || $self->payinfo_check()
  ;
  return $error if $error;

  return "paid must be > 0 " if $self->paid <= 0;

  return "unknown cust_main.custnum: ". $self->custnum
    unless $self->invnum
           || qsearchs( 'cust_main', { 'custnum' => $self->custnum } );

  $self->_date(time) unless $self->_date;

#i guess not now, with cust_pay_pending, if we actually make it here, we _do_ want to record it
#  # UNIQUE index should catch this too, without race conditions, but this
#  # should give a better error message the other 99.9% of the time...
#  if ( length($self->payunique)
#       && qsearchs('cust_pay', { 'payunique' => $self->payunique } ) ) {
#    #well, it *could* be a better error message
#    return "duplicate transaction".
#           " - a payment with unique identifer ". $self->payunique.
#           " already exists";
#  }

  $self->SUPER::check;
}

=item send_receipt HASHREF | OPTION => VALUE ...

Sends a payment receipt for this payment..

Available options:

=over 4

=item manual

Flag indicating the payment is being made manually.

=item cust_bill

Invoice (FS::cust_bill) object.  If not specified, the most recent invoice
will be assumed.

=item cust_main

Customer (FS::cust_main) object (for efficiency).

=back

=cut

sub send_receipt {
  my $self = shift;
  my $opt = ref($_[0]) ? shift : { @_ };

  my $cust_bill = $opt->{'cust_bill'};
  my $cust_main = $opt->{'cust_main'} || $self->cust_main;

  my $conf = new FS::Conf;

  return ''
    unless $conf->exists('payment_receipt_email')
        && grep { $_ !~ /^(POST|FAX)$/ } $cust_main->invoicing_list;

  $cust_bill ||= ($cust_main->cust_bill)[-1]; #rather inefficient though?

  if (    ( exists($opt->{'manual'}) && $opt->{'manual'} )
       || ! $conf->exists('invoice_html_statement')
       || ! $cust_bill
     ) {

    my $receipt_template = new Text::Template (
      TYPE   => 'ARRAY',
      SOURCE => [ map "$_\n", $conf->config('payment_receipt_email') ],
    ) or do {
      warn "can't create payment receipt template: $Text::Template::ERROR";
      return '';
    };

    my @invoicing_list = grep { $_ !~ /^(POST|FAX)$/ }
                           $cust_main->invoicing_list;

    my $payby = $self->payby;
    my $payinfo = $self->payinfo;
    $payby =~ s/^BILL$/Check/ if $payinfo;
    if ( $payby eq 'CARD' || $payby eq 'CHEK' ) {
      $payinfo = $self->paymask
    } else {
      $payinfo = $self->decrypt($payinfo);
    }
    $payby =~ s/^CHEK$/Electronic check/;

    my %fill_in = (
      'date'         => time2str("%a %B %o, %Y", $self->_date),
      'name'         => $cust_main->name,
      'paynum'       => $self->paynum,
      'paid'         => sprintf("%.2f", $self->paid),
      'payby'        => ucfirst(lc($payby)),
      'payinfo'      => $payinfo,
      'balance'      => $cust_main->balance,
      'company_name' => $conf->config('company_name', $cust_main->agentnum),
    );

    if ( $opt->{'cust_pkg'} ) {
      $fill_in{'pkg'} = $opt->{'cust_pkg'}->part_pkg->pkg;
      #setup date, other things?
    }

    send_email(
      'from'    => $conf->config('invoice_from', $cust_main->agentnum),
                                 #invoice_from??? well as good as any
      'to'      => \@invoicing_list,
      'subject' => 'Payment receipt',
      'body'    => [ $receipt_template->fill_in( HASH => \%fill_in ) ],
    );

  } else {

    my $queue = new FS::queue {
       'paynum' => $self->paynum,
       'job'    => 'FS::cust_bill::queueable_email',
    };

    $queue->insert(
      'invnum'   => $cust_bill->invnum,
      'template' => 'statement',
    );

  }

}

=item cust_bill_pay

Returns all applications to invoices (see L<FS::cust_bill_pay>) for this
payment.

=cut

sub cust_bill_pay {
  my $self = shift;
  sort {    $a->_date  <=> $b->_date
         || $a->invnum <=> $b->invnum }
    qsearch( 'cust_bill_pay', { 'paynum' => $self->paynum } )
  ;
}

=item cust_pay_refund

Returns all applications of refunds (see L<FS::cust_pay_refund>) to this
payment.

=cut

sub cust_pay_refund {
  my $self = shift;
  sort { $a->_date <=> $b->_date }
    qsearch( 'cust_pay_refund', { 'paynum' => $self->paynum } )
  ;
}


=item unapplied

Returns the amount of this payment that is still unapplied; which is
paid minus all payment applications (see L<FS::cust_bill_pay>) and refund
applications (see L<FS::cust_pay_refund>).

=cut

sub unapplied {
  my $self = shift;
  my $amount = $self->paid;
  $amount -= $_->amount foreach ( $self->cust_bill_pay );
  $amount -= $_->amount foreach ( $self->cust_pay_refund );
  sprintf("%.2f", $amount );
}

=item unrefunded

Returns the amount of this payment that has not been refuned; which is
paid minus all  refund applications (see L<FS::cust_pay_refund>).

=cut

sub unrefunded {
  my $self = shift;
  my $amount = $self->paid;
  $amount -= $_->amount foreach ( $self->cust_pay_refund );
  sprintf("%.2f", $amount );
}

=item amount

Returns the "paid" field.

=cut

sub amount {
  my $self = shift;
  $self->paid();
}

=back

=head1 CLASS METHODS

=over 4

=item batch_insert CUST_PAY_OBJECT, ...

Class method which inserts multiple payments.  Takes a list of FS::cust_pay
objects.  Returns a list, each element representing the status of inserting the
corresponding payment - empty.  If there is an error inserting any payment, the
entire transaction is rolled back, i.e. all payments are inserted or none are.

For example:

  my @errors = FS::cust_pay->batch_insert(@cust_pay);
  my $num_errors = scalar(grep $_, @errors);
  if ( $num_errors == 0 ) {
    #success; all payments were inserted
  } else {
    #failure; no payments were inserted.
  }

=cut

sub batch_insert {
  my $self = shift; #class method

  local $SIG{HUP} = 'IGNORE';
  local $SIG{INT} = 'IGNORE';
  local $SIG{QUIT} = 'IGNORE';
  local $SIG{TERM} = 'IGNORE';
  local $SIG{TSTP} = 'IGNORE';
  local $SIG{PIPE} = 'IGNORE';

  my $oldAutoCommit = $FS::UID::AutoCommit;
  local $FS::UID::AutoCommit = 0;
  my $dbh = dbh;

  my $errors = 0;
  
  my @errors = map {
    my $error = $_->insert( 'manual' => 1 );
    if ( $error ) { 
      $errors++;
    } else {
      $_->cust_main->apply_payments;
    }
    $error;
  } @_;

  if ( $errors ) {
    $dbh->rollback if $oldAutoCommit;
  } else {
    $dbh->commit or die $dbh->errstr if $oldAutoCommit;
  }

  @errors;

}

=item unapplied_sql

Returns an SQL fragment to retreive the unapplied amount.

=cut 

sub unapplied_sql {
  #my $class = shift;

  "paid
        - COALESCE( 
                    ( SELECT SUM(amount) FROM cust_bill_pay
                        WHERE cust_pay.paynum = cust_bill_pay.paynum )
                    ,0
                  )
        - COALESCE(
                    ( SELECT SUM(amount) FROM cust_pay_refund
                        WHERE cust_pay.paynum = cust_pay_refund.paynum )
                    ,0
                  )
  ";

}

# _upgrade_data
#
# Used by FS::Upgrade to migrate to a new database.

use FS::h_cust_pay;

sub _upgrade_data {  #class method
  my ($class, %opts) = @_;

  warn "$me upgrading $class\n" if $DEBUG;

  #not the most efficient, but hey, it only has to run once

  my $where = "WHERE ( otaker IS NULL OR otaker = '' OR otaker = 'ivan' ) ".
              "  AND 0 < ( SELECT COUNT(*) FROM cust_main                 ".
              "              WHERE cust_main.custnum = cust_pay.custnum ) ";

  my $count_sql = "SELECT COUNT(*) FROM cust_pay $where";

  my $sth = dbh->prepare($count_sql) or die dbh->errstr;
  $sth->execute or die $sth->errstr;
  my $total = $sth->fetchrow_arrayref->[0];
  #warn "$total cust_pay records to update\n"
  #  if $DEBUG;
  local($DEBUG) = 2 if $total > 1000; #could be a while, force progress info

  my $count = 0;
  my $lastprog = 0;

  my @cust_pay = qsearch( {
      'table'     => 'cust_pay',
      'hashref'   => {},
      'extra_sql' => $where,
      'order_by'  => 'ORDER BY paynum',
  } );

  foreach my $cust_pay (@cust_pay) {

    my $h_cust_pay = $cust_pay->h_search('insert');
    if ( $h_cust_pay ) {
      next if $cust_pay->otaker eq $h_cust_pay->history_user;
      $cust_pay->otaker($h_cust_pay->history_user);
    } else {
      $cust_pay->otaker('legacy');
    }

    delete $FS::payby::hash{'COMP'}->{cust_pay}; #quelle kludge
    my $error = $cust_pay->replace;

    if ( $error ) {
      warn " *** WARNING: Error updating order taker for payment paynum ".
           $cust_pay->paynun. ": $error\n";
      next;
    }

    $FS::payby::hash{'COMP'}->{cust_pay} = ''; #restore it

    $count++;
    if ( $DEBUG > 1 && $lastprog + 30 < time ) {
      warn "$me $count/$total (". sprintf('%.2f',100*$count/$total). '%)'. "\n";
      $lastprog = time;
    }

  }

}

=back

=head1 SUBROUTINES

=over 4 

=item batch_import HASHREF

Inserts new payments.

=cut

sub batch_import {
  my $param = shift;

  my $fh = $param->{filehandle};
  my $agentnum = $param->{agentnum};
  my $format = $param->{'format'};
  my $paybatch = $param->{'paybatch'};

  # here is the agent virtualization
  my $extra_sql = ' AND '. $FS::CurrentUser::CurrentUser->agentnums_sql;

  my @fields;
  my $payby;
  if ( $format eq 'simple' ) {
    @fields = qw( custnum agent_custid paid payinfo );
    $payby = 'BILL';
  } elsif ( $format eq 'extended' ) {
    die "unimplemented\n";
    @fields = qw( );
    $payby = 'BILL';
  } else {
    die "unknown format $format";
  }

  eval "use Text::CSV_XS;";
  die $@ if $@;

  my $csv = new Text::CSV_XS;

  my $imported = 0;

  local $SIG{HUP} = 'IGNORE';
  local $SIG{INT} = 'IGNORE';
  local $SIG{QUIT} = 'IGNORE';
  local $SIG{TERM} = 'IGNORE';
  local $SIG{TSTP} = 'IGNORE';
  local $SIG{PIPE} = 'IGNORE';

  my $oldAutoCommit = $FS::UID::AutoCommit;
  local $FS::UID::AutoCommit = 0;
  my $dbh = dbh;
  
  my $line;
  while ( defined($line=<$fh>) ) {

    $csv->parse($line) or do {
      $dbh->rollback if $oldAutoCommit;
      return "can't parse: ". $csv->error_input();
    };

    my @columns = $csv->fields();

    my %cust_pay = (
      payby    => $payby,
      paybatch => $paybatch,
    );

    my $cust_main;
    foreach my $field ( @fields ) {

      if ( $field eq 'agent_custid'
        && $agentnum
        && $columns[0] =~ /\S+/ )
      {

        my $agent_custid = $columns[0];
        my %hash = ( 'agent_custid' => $agent_custid,
                     'agentnum'     => $agentnum,
                   );

        if ( $cust_pay{'custnum'} !~ /^\s*$/ ) {
          $dbh->rollback if $oldAutoCommit;
          return "can't specify custnum with agent_custid $agent_custid";
        }

        $cust_main = qsearchs({
                                'table'     => 'cust_main',
                                'hashref'   => \%hash,
                                'extra_sql' => $extra_sql,
                             });

        unless ( $cust_main ) {
          $dbh->rollback if $oldAutoCommit;
          return "can't find customer with agent_custid $agent_custid";
        }

        $field = 'custnum';
        $columns[0] = $cust_main->custnum;
      }

      $cust_pay{$field} = shift @columns; 
    }

    my $cust_pay = new FS::cust_pay( \%cust_pay );
    my $error = $cust_pay->insert;

    if ( $error ) {
      $dbh->rollback if $oldAutoCommit;
      return "can't insert payment for $line: $error";
    }

    if ( $format eq 'simple' ) {
      # include agentnum for less surprise?
      $cust_main = qsearchs({
                             'table'     => 'cust_main',
                             'hashref'   => { 'custnum' => $cust_pay->custnum },
                             'extra_sql' => $extra_sql,
                           })
        unless $cust_main;

      unless ( $cust_main ) {
        $dbh->rollback if $oldAutoCommit;
        return "can't find customer to which payments apply at line: $line";
      }

      $error = $cust_main->apply_payments_and_credits;
      if ( $error ) {
        $dbh->rollback if $oldAutoCommit;
        return "can't apply payments to customer for $line: $error";
      }

    }

    $imported++;
  }

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

  return "Empty file!" unless $imported;

  ''; #no error

}

=back

=head1 BUGS

Delete and replace methods.  

=head1 SEE ALSO

L<FS::cust_pay_pending>, L<FS::cust_bill_pay>, L<FS::cust_bill>, L<FS::Record>,
schema.html from the base documentation.

=cut

1;