package FS::detail_format;

use strict;
use vars qw( $DEBUG );
use FS::Conf;
use FS::cdr;
use FS::cust_bill_pkg_detail;
use FS::L10N;
use Date::Language;
use Text::CSV_XS;

my $me = '[FS::detail_format]';

=head1 NAME

FS::detail_format - invoice detail formatter

=head1 DESCRIPTION

An FS::detail_format object is a converter to create invoice details 
(L<FS::cust_bill_pkg_detail>) from call detail records (L<FS::cdr>)
or other usage information.  FS::detail_format inherits from nothing.

Subclasses of FS::detail_format represent specific detail formats.

=head1 CLASS METHODS

=over 4

=item new FORMAT, OPTIONS

Returns a new detail formatter.  The FORMAT argument is the name of 
a subclass.

OPTIONS may contain:

- buffer: an arrayref to store details into.  This may avoid the need for a
large copy operation at the end of processing.  However, since summary
formats will produce nothing until the end of processing, C<finish> must be
called after all CDRs have been appended.

- inbound: a flag telling the formatter to format CDRs for display to the
receiving party, rather than the originator.  In this case, the
L<FS::cdr_termination> object will be fetched and its values used for
rated_price, rated_seconds, rated_minutes, and svcnum.  This can be changed
with the C<inbound> method.

- locale: a locale string to use for static text and date formats.  This is
optional.

- rounding: the number of decimal places to show in the amount column. This
is optional, and defaults to whatever's in the schema (which is 4).

=cut

sub new {
  my $class = shift;
  if ( $class eq 'FS::detail_format' ) {
    my $format = shift
      or die "$me format name required";
    $class = "FS::detail_format::$format"
      unless $format =~ /^FS::detail_format::/;
  }
  eval "use $class";
  die "$me error loading $class: $@" if $@;
  my %opt = @_;

  my $locale = $opt{'locale'} || '';
  my $conf = FS::Conf->new({ locale => $locale });
  $locale ||= $conf->config('locale') || 'en_US';

  my %locale_info = FS::Locales->locale_info($locale);
  my $language_name = $locale_info{'name'};

  my $self = { conf => FS::Conf->new({ locale => $locale }),
               csv  => Text::CSV_XS->new({ binary => 1 }),
               inbound  => ($opt{'inbound'} ? 1 : 0),
               rounding => $opt{'rounding'},
               buffer   => ($opt{'buffer'} || []),
               _lh      => FS::L10N->get_handle($locale),
               _dh      => eval { Date::Language->new($language_name) } ||
                           Date::Language->new()
             };
  bless $self, $class;
}

=back

=head1 METHODS

=over 4

=item inbound VALUE

Set/get the 'inbound' flag.

=cut

sub inbound {
  my $self = shift;
  $self->{inbound} = ($_[0] > 0) if (@_);
  $self->{inbound};
}

=item phonenum VALUE

Set/get the locally meaningful phone number.  This is used to tag call details
for presentation on certain kinds of invoices.

=cut

sub phonenum {
  my $self = shift;
  $self->{phonenum} = shift if @_;
  $self->{phonenum};
}

=item append CDRS

Takes any number of call detail records (as L<FS::cdr> objects),
formats them, and appends them to the internal buffer.

By default, this simply calls C<single_detail> on each CDR in the 
set.  Subclasses should override C<append> and maybe C<finish> if 
they do not produce detail lines from CDRs in a 1:1 fashion.

The 'billpkgnum', 'invnum', 'pkgnum', and 'phonenum' fields will 
be set later.

=cut

sub append {
  my $self = shift;
  foreach (@_) {
    push @{ $self->{buffer} }, $self->single_detail($_);
  }
}

=item details

Returns all invoice detail records in the buffer.  This will perform 
a C<finish> first.  Subclasses generally shouldn't override this.

=cut

sub details {
  my $self = shift;
  $self->finish;
  @{ $self->{buffer} }
}

=item finish

Ensures that all invoice details are generated given the CDRs that 
have been appended.  By default, this does nothing.

=cut

sub finish {}

=item header

Returns a header row for the format, as an L<FS::cust_bill_pkg_detail>
object.  By default this has 'format' = 'C', 'detail' = the value 
returned by C<header_detail>, and all other fields empty.

This is called after C<finish>, so it can use information from the CDRs.

=cut

sub header {
  my $self = shift;

  FS::cust_bill_pkg_detail->new(
    { 'format' => 'C', 'detail' => $self->header_detail }
  )
}

=item single_detail CDR

Takes a single CDR and returns an invoice detail to describe it.

By default, this maps the following fields from the CDR:

acctid            => acctid
rated_price       => amount
rated_classnum    => classnum
rated_seconds     => duration
rated_regionname  => regionname
accountcode       => accountcode
startdate         => startdate

If the formatter is in inbound mode, it will look up a C<cdr_termination>
record and use rated_price and rated_seconds from that, and acctid will be
set to null to avoid linking the CDR to the detail record for the inbound
leg of the call.

'phonenum' is set to the internal C<phonenum> value set on the formatter
object.

It then calls C<columns> on the CDR to obtain a list of detail
columns, formats them as a CSV string, and stores that in the 
'detail' field.

=cut

sub single_detail {
  my $self = shift;
  my $cdr = shift;

  my @columns = $self->columns($cdr);
  my $status = $self->csv->combine(@columns);
  die "$me error combining ".$self->csv->error_input."\n"
    if !$status;

  my $object = $self->{inbound} ? $cdr->cdr_termination(1) : $cdr;
  my $price = $object->rated_price if $object;
  $price = 0 if $cdr->freesidestatus eq 'no-charge';
  $price = sprintf('%.*f', $self->{'rounding'}, $price)
    if $self->{'rounding'} and length($price);

  FS::cust_bill_pkg_detail->new( {
      'acctid'      => ($self->{inbound} ? '' : $cdr->acctid),
      'amount'      => $price,
      'classnum'    => $cdr->rated_classnum,
      'duration'    => $object->rated_seconds,
      'regionname'  => $cdr->rated_regionname,
      'accountcode' => $cdr->accountcode,
      'startdate'   => $cdr->startdate,
      'format'      => 'C',
      'detail'      => $self->csv->string,
      'phonenum'    => $self->phonenum,
  });
}

=item columns CDR

Returns a list of CSV columns (to be shown on the invoice) for
the CDR.  This is the method most subclasses should override.

=cut

sub columns {
  my $self = shift;
  die "$me no columns method in ".ref($self);
}

=item header_detail

Returns the 'detail' field for the header row.  This should 
probably be a CSV string of column headers for the values returned
by C<columns>.

=cut

sub header_detail {
  my $self = shift;
  die "$me no header_detail method in ".ref($self);
}

# convenience methods for subclasses

sub conf { $_[0]->{conf} }

sub csv { $_[0]->{csv} }

sub date_format {
  my $self = shift;
  $self->{date_format} ||= ($self->conf->config('date_format') || '%m/%d/%Y');
}

sub money_char {
  my $self = shift;
  $self->{money_char} ||= ($self->conf->config('money_char') || '$');
}

# localization methods

sub time2str_local {
  my $self = shift;
  $self->{_dh}->time2str(@_);
}

# header strings are now localized in FS::TemplateItem_Mixin::detail

#imitate previous behavior for now

sub duration {
  my $self = shift;
  my $cdr = shift;
  my $object = $self->{inbound} ? $cdr->cdr_termination(1) : $cdr;
  my $sec = $object->rated_seconds if $object;
  $sec ||= 0;
  # termination objects now have rated_granularity.
  if ( $object->rated_granularity eq '0' ) {
    '1 call';
  }
  elsif ( $object->rated_granularity eq '60' ) {
    sprintf('%dm', ($sec + 59)/60);
  }
  else {
    sprintf('%dm %ds', $sec / 60, $sec % 60);
  }
}

sub price {
  my $self = shift;
  my $cdr = shift;
  my $object = $self->{inbound} ? $cdr->cdr_termination(1) : $cdr;
  my $price = $object->rated_price if $object;
  $price = '0.00' if $object->freesidestatus eq 'no-charge';
  $price = sprintf('%.*f', $self->{'rounding'}, $price)
    if $self->{'rounding'};
  if (length($price)) {
    $price = sprintf('%.*f', $self->{'rounding'}, $price)
      if $self->{'rounding'};
    return $self->money_char . $price;
  } else {
    return '';
  }
}

1;