package SL::DB::Part;

use strict;

use Carp;
use List::MoreUtils qw(any);
use Rose::DB::Object::Helpers qw(as_tree);

use SL::Locale::String qw(t8);
use SL::DBUtils;
use SL::DB::MetaSetup::Part;
use SL::DB::Manager::Part;
use SL::DB::Chart;
use SL::DB::Helper::AttrHTML;
use SL::DB::Helper::AttrSorted;
use SL::DB::Helper::TransNumberGenerator;
use SL::DB::Helper::CustomVariables (
  module      => 'IC',
  cvars_alias => 1,
);
use SL::DB::Helper::DisplayableNamePreferences (
  title   => t8('Article'),
  options => [ {name => 'partnumber',  title => t8('Part Number')     },
               {name => 'description', title => t8('Description')    },
               {name => 'notes',       title => t8('Notes')},
               {name => 'ean',         title => t8('EAN')            }, ],
);

use List::Util qw(sum);

__PACKAGE__->meta->add_relationships(
  assemblies                     => {
    type         => 'one to many',
    class        => 'SL::DB::Assembly',
    manager_args => { sort_by => 'position, oid' },
    column_map   => { id => 'id' },
  },
  prices         => {
    type         => 'one to many',
    class        => 'SL::DB::Price',
    column_map   => { id => 'parts_id' },
    manager_args => { with_objects => [ 'pricegroup' ] }
  },
  makemodels     => {
    type         => 'one to many',
    class        => 'SL::DB::MakeModel',
    manager_args => { sort_by => 'sortorder' },
    column_map   => { id => 'parts_id' },
  },
  customerprices => {
    type         => 'one to many',
    class        => 'SL::DB::PartCustomerPrice',
    column_map   => { id => 'parts_id' },
  },
  translations   => {
    type         => 'one to many',
    class        => 'SL::DB::Translation',
    column_map   => { id => 'parts_id' },
  },
  assortment_items => {
    type         => 'one to many',
    class        => 'SL::DB::AssortmentItem',
    column_map   => { id => 'assortment_id' },
  },
  history_entries   => {
    type            => 'one to many',
    class           => 'SL::DB::History',
    column_map      => { id => 'trans_id' },
    query_args      => [ what_done => 'part' ],
    manager_args    => { sort_by => 'itime' },
  },
  shop_parts     => {
    type         => 'one to many',
    class        => 'SL::DB::ShopPart',
    column_map   => { id => 'part_id' },
    manager_args => { with_objects => [ 'shop' ] },
  },
);

__PACKAGE__->meta->initialize;

__PACKAGE__->attr_html('notes');
__PACKAGE__->attr_sorted({ unsorted => 'makemodels', position => 'sortorder' });

__PACKAGE__->before_save('_before_save_set_partnumber');

sub _before_save_set_partnumber {
  my ($self) = @_;

  $self->create_trans_number if !$self->partnumber;
  return 1;
}

sub items {
  my ($self) = @_;

  if ( $self->part_type eq 'assembly' ) {
    return $self->assemblies;
  } elsif ( $self->part_type eq 'assortment' ) {
    return $self->assortment_items;
  } else {
    return undef;
  }
}

sub items_checksum {
  my ($self) = @_;

  # for detecting if the items of an (orphaned) assembly or assortment have
  # changed when saving

  return join(' ', sort map { $_->part->id } @{$self->items});
};

sub validate {
  my ($self) = @_;

  my @errors;
  push @errors, $::locale->text('The partnumber is missing.')     if $self->id and !$self->partnumber;
  push @errors, $::locale->text('The unit is missing.')           unless $self->unit;
  push @errors, $::locale->text('The buchungsgruppe is missing.') unless $self->buchungsgruppen_id or $self->buchungsgruppe;

  unless ( $self->id ) {
    push @errors, $::locale->text('The partnumber already exists.') if SL::DB::Manager::Part->get_all_count(where => [ partnumber => $self->partnumber ]);
  };

  if ($self->is_assortment && $self->orphaned && scalar @{$self->assortment_items} == 0) {
    # when assortment isn't orphaned form doesn't contain any items
    push @errors, $::locale->text('The assortment doesn\'t have any items.');
  }

  if ($self->is_assembly && scalar @{$self->assemblies} == 0) {
    push @errors, $::locale->text('The assembly doesn\'t have any items.');
  }

  return @errors;
}

sub is_type {
  my $self = shift;
  my $type  = lc(shift || '');
  die 'invalid type' unless $type =~ /^(?:part|service|assembly|assortment)$/;

  return $self->type eq $type ? 1 : 0;
}

sub is_part       { $_[0]->part_type eq 'part'       }
sub is_assembly   { $_[0]->part_type eq 'assembly'   }
sub is_service    { $_[0]->part_type eq 'service'    }
sub is_assortment { $_[0]->part_type eq 'assortment' }

sub type {
  return $_[0]->part_type;
  # my ($self, $type) = @_;
  # if (@_ > 1) {
  #   die 'invalid type' unless $type =~ /^(?:part|service|assembly)$/;
  #   $self->assembly(          $type eq 'assembly' ? 1 : 0);
  #   $self->inventory_accno_id($type ne 'service'  ? 1 : undef);
  # }

  # return 'assembly' if $self->assembly;
  # return 'part'     if $self->inventory_accno_id;
  # return 'service';
}

sub new_part {
  my ($class, %params) = @_;
  $class->new(%params, part_type => 'part');
}

sub new_assembly {
  my ($class, %params) = @_;
  $class->new(%params, part_type => 'assembly');
}

sub new_service {
  my ($class, %params) = @_;
  $class->new(%params, part_type => 'service');
}

sub new_assortment {
  my ($class, %params) = @_;
  $class->new(%params, part_type => 'assortment');
}

sub last_modification {
  my ($self) = @_;
  return $self->mtime // $self->itime;
};

sub used_in_record {
  my ($self) = @_;
  die 'not an accessor' if @_ > 1;

  return 1 unless $self->id;

  my @relations = qw(
    SL::DB::InvoiceItem
    SL::DB::OrderItem
    SL::DB::DeliveryOrderItem
  );

  for my $class (@relations) {
    eval "require $class";
    return 1 if $class->_get_manager_class->get_all_count(query => [ parts_id => $self->id ]);
  }
  return 0;
}
sub orphaned {
  my ($self) = @_;
  die 'not an accessor' if @_ > 1;

  return 1 unless $self->id;

  my @relations = qw(
    SL::DB::InvoiceItem
    SL::DB::OrderItem
    SL::DB::DeliveryOrderItem
    SL::DB::Inventory
    SL::DB::AssortmentItem
  );

  for my $class (@relations) {
    eval "require $class";
    return 0 if $class->_get_manager_class->get_all_count(query => [ parts_id => $self->id ]);
  }
  return 1;
}

sub get_sellprice_info {
  my $self   = shift;
  my %params = @_;

  confess "Missing part id" unless $self->id;

  my $object = $self->load;

  return { sellprice       => $object->sellprice,
           price_factor_id => $object->price_factor_id };
}

sub get_ordered_qty {
  my $self   = shift;
  my %result = SL::DB::Manager::Part->get_ordered_qty($self->id);

  return $result{ $self->id };
}

sub available_units {
  shift->unit_obj->convertible_units;
}

# autogenerated accessor is slightly off...
sub buchungsgruppe {
  shift->buchungsgruppen(@_);
}

sub get_taxkey {
  my ($self, %params) = @_;

  my $date     = $params{date} || DateTime->today_local;
  my $is_sales = !!$params{is_sales};
  my $taxzone  = $params{ defined($params{taxzone}) ? 'taxzone' : 'taxzone_id' } * 1;
  my $tk_info  = $::request->cache('get_taxkey');

  $tk_info->{$self->id}                                      //= {};
  $tk_info->{$self->id}->{$taxzone}                          //= { };
  my $cache = $tk_info->{$self->id}->{$taxzone}->{$is_sales} //= { };

  if (!exists $cache->{$date}) {
    $cache->{$date} =
      $self->get_chart(type => $is_sales ? 'income' : 'expense', taxzone => $taxzone)
      ->get_active_taxkey($date);
  }

  return $cache->{$date};
}

sub get_chart {
  my ($self, %params) = @_;

  my $type    = (any { $_ eq $params{type} } qw(income expense inventory)) ? $params{type} : croak("Invalid 'type' parameter '$params{type}'");
  my $taxzone = $params{ defined($params{taxzone}) ? 'taxzone' : 'taxzone_id' } * 1;

  my $charts     = $::request->cache('get_chart_id/by_part_id_and_taxzone')->{$self->id} //= {};
  my $all_charts = $::request->cache('get_chart_id/by_id');

  $charts->{$taxzone} ||= { };

  if (!exists $charts->{$taxzone}->{$type}) {
    require SL::DB::Buchungsgruppe;
    my $bugru    = SL::DB::Buchungsgruppe->load_cached($self->buchungsgruppen_id);
    my $chart_id = ($type eq 'inventory') ? ($self->is_part ? $bugru->inventory_accno_id : undef)
                 :                          $bugru->call_sub("${type}_accno_id", $taxzone);

    if ($chart_id) {
      my $chart                    = $all_charts->{$chart_id} // SL::DB::Chart->load_cached($chart_id)->load;
      $all_charts->{$chart_id}     = $chart;
      $charts->{$taxzone}->{$type} = $chart;
    }
  }

  return $charts->{$taxzone}->{$type};
}

sub get_stock {
  my ($self, %params) = @_;

  return undef unless $self->id;

  my $query = 'SELECT SUM(qty) FROM inventory WHERE parts_id = ?';
  my @values = ($self->id);

  if ( $params{bin_id} ) {
    $query .= ' AND bin_id = ?';
    push(@values, $params{bin_id});
  }

  if ( $params{warehouse_id} ) {
    $query .= ' AND warehouse_id = ?';
    push(@values, $params{warehouse_id});
  }

  if ( $params{shippingdate} ) {
    die unless ref($params{shippingdate}) eq 'DateTime';
    $query .= ' AND shippingdate <= ?';
    push(@values, $params{shippingdate});
  }

  my ($stock) = selectrow_query($::form, $self->db->dbh, $query, @values);

  return $stock || 0; # never return undef
};


# this is designed to ignore chargenumbers, expiration dates and just give a list of how much <-> where
sub get_simple_stock {
  my ($self, %params) = @_;

  return [] unless $self->id;

  my $query = <<'';
    SELECT sum(qty), warehouse_id, bin_id FROM inventory WHERE parts_id = ?
    GROUP BY warehouse_id, bin_id

  my $stock_info = selectall_hashref_query($::form, $::form->get_standard_dbh, $query, $self->id);
  [ map { bless $_, 'SL::DB::Part::SimpleStock'} @$stock_info ];
}
# helper class to have bin/warehouse accessors in stock result
{ package SL::DB::Part::SimpleStock;
  sub warehouse { require SL::DB::Warehouse; SL::DB::Manager::Warehouse->find_by_or_create(id => $_[0]->{warehouse_id}) }
  sub bin       { require SL::DB::Bin;       SL::DB::Manager::Bin      ->find_by_or_create(id => $_[0]->{bin_id}) }
}

sub clone_and_reset_deep {
  my ($self) = @_;

  my $clone = $self->clone_and_reset; # resets id and partnumber (primary key and unique constraint)
  $clone->makemodels(   map { $_->clone_and_reset } @{$self->makemodels}   ) if @{$self->makemodels};
  $clone->translations( map { $_->clone_and_reset } @{$self->translations} ) if @{$self->translations};

  if ( $self->is_assortment ) {
    # use clone rather than reset_and_clone because the unique constraint would also remove parts_id
    $clone->assortment_items( map { $_->clone } @{$self->assortment_items} );
    $_->assortment_id(undef) foreach @{ $clone->assortment_items }
  };

  if ( $self->is_assembly ) {
    $clone->assemblies( map { $_->clone_and_reset } @{$self->assemblies});
  };

  if ( $self->prices ) {
    $clone->prices( map { $_->clone } @{$self->prices}); # pricegroup_id gets reset here because it is part of a unique contraint
    if ( $clone->prices ) {
      foreach my $price ( @{$clone->prices} ) {
        $price->id(undef);
        $price->parts_id(undef);
      };
    };
  };

  return $clone;
}

sub item_diffs {
  my ($self, $comparison_part) = @_;

  die "item_diffs needs a part object" unless ref($comparison_part) eq 'SL::DB::Part';
  die "part and comparison_part need to be of the same part_type" unless
        ( $self->part_type eq 'assembly' or $self->part_type eq 'assortment' )
    and ( $comparison_part->part_type eq 'assembly' or $comparison_part->part_type eq 'assortment' )
    and $self->part_type eq $comparison_part->part_type;

  # return [], [] if $self->items_checksum eq $comparison_part->items_checksum;
  my @self_part_ids       = map { $_->parts_id } $self->items;
  my @comparison_part_ids = map { $_->parts_id } $comparison_part->items;

  my %orig       = map{ $_ => 1 } @self_part_ids;
  my %comparison = map{ $_ => 1 } @comparison_part_ids;
  my (@additions, @removals);
  @additions = grep { !exists( $orig{$_}       ) } @comparison_part_ids if @comparison_part_ids;
  @removals  = grep { !exists( $comparison{$_} ) } @self_part_ids       if @self_part_ids;

  return \@additions, \@removals;
};

sub items_sellprice_sum {
  my ($self, %params) = @_;

  return unless $self->is_assortment or $self->is_assembly;
  return unless $self->items;

  if ($self->is_assembly) {
    return sum map { $_->linetotal_sellprice          } @{$self->items};
  } else {
    return sum map { $_->linetotal_sellprice(%params) } grep { $_->charge } @{$self->items};
  }
}

sub items_lastcost_sum {
  my ($self) = @_;

  return unless $self->is_assortment or $self->is_assembly;
  return unless $self->items;
  sum map { $_->linetotal_lastcost } @{$self->items};
};

1;

__END__

=pod

=encoding utf-8

=head1 NAME

SL::DB::Part: Model for the 'parts' table

=head1 SYNOPSIS

This is a standard Rose::DB::Object based model and can be used as one.

=head1 TYPES

Although the base class is called C<Part> we usually talk about C<Articles> if
we mean instances of this class. This is because articles come in three
flavours called:

=over 4

=item Part     - a single part

=item Service  - a part without onhand, and without inventory accounting

=item Assembly - a collection of both parts and services

=item Assortment - a collection of items (parts or assemblies)

=back

These types are sadly represented by data inside the class and cannot be
migrated into a flag. To work around this, each C<Part> object knows what type
it currently is. Since the type is data driven, there ist no explicit setting
method for it, but you can construct them explicitly with C<new_part>,
C<new_service>, C<new_assembly> and C<new_assortment>. A Buchungsgruppe should be supplied in this
case, but it will use the default Buchungsgruppe if you don't.

Matching these there are assorted helper methods dealing with types,
e.g.  L</new_part>, L</new_service>, L</new_assembly>, L</type>,
L</is_type> and others.

=head1 FUNCTIONS

=over 4

=item C<new_part %PARAMS>

=item C<new_service %PARAMS>

=item C<new_assembly %PARAMS>

Will set the appropriate data fields so that the resulting instance will be of
the requested type. Since accounting targets are part of the distinction,
providing a C<Buchungsgruppe> is recommended. If none is given the constructor
will load a default one and set the accounting targets from it.

=item C<type>

Returns the type as a string. Can be one of C<part>, C<service>, C<assembly>.

=item C<is_type $TYPE>

Tests if the current object is a part, a service or an
assembly. C<$type> must be one of the words 'part', 'service' or
'assembly' (their plurals are ok, too).

Returns 1 if the requested type matches, 0 if it doesn't and
C<confess>es if an unknown C<$type> parameter is encountered.

=item C<is_part>

=item C<is_service>

=item C<is_assembly>

Shorthand for C<is_type('part')> etc.

=item C<get_sellprice_info %params>

Retrieves the C<sellprice> and C<price_factor_id> for a part under
different conditions and returns a hash reference with those two keys.

If C<%params> contains a key C<project_id> then a project price list
will be consulted if one exists for that project. In this case the
parameter C<country_id> is evaluated as well: if a price list entry
has been created for this country then it will be used. Otherwise an
entry without a country set will be used.

If none of the above conditions is met then the information from
C<$self> is used.

=item C<get_ordered_qty %params>

Retrieves the quantity that has been ordered from a vendor but that
has not been delivered yet. Only open purchase orders are considered.

=item C<get_taxkey %params>

Retrieves and returns a taxkey object valid for the given date
C<$params{date}> and tax zone C<$params{taxzone}>
(C<$params{taxzone_id}> is also recognized). The date defaults to the
current date if undefined.

This function looks up the income (for trueish values of
C<$params{is_sales}>) or expense (for falsish values of
C<$params{is_sales}>) account for the current part. It uses the part's
associated buchungsgruppe and uses the fields belonging to the tax
zone given by C<$params{taxzone}>.

The information retrieved by the function is cached.

=item C<get_chart %params>

Retrieves and returns a chart object valid for the given type
C<$params{type}> and tax zone C<$params{taxzone}>
(C<$params{taxzone_id}> is also recognized). The type must be one of
the three key words C<income>, C<expense> and C<inventory>.

This function uses the part's associated buchungsgruppe and uses the
fields belonging to the tax zone given by C<$params{taxzone}>.

The information retrieved by the function is cached.

=item C<used_in_record>

Checks if this article has been used in orders, invoices or delivery orders.

=item C<orphaned>

Checks if this article is used in orders, invoices, delivery orders or
assemblies.

=item C<buchungsgruppe BUCHUNGSGRUPPE>

Used to set the accounting information from a L<SL:DB::Buchungsgruppe> object.
Please note, that this is a write only accessor, the original Buchungsgruppe can
not be retrieved from an article once set.

=item C<items_lastcost_sum>

Non-recursive lastcost sum of all the items in an assembly or assortment.

=item C<get_stock %params>

Fetches stock qty in the default unit for a part.

bin_id and warehouse_id may be passed as params. If only a bin_id is passed,
the stock qty for that bin is returned. If only a warehouse_id is passed, the
stock qty for all bins in that warehouse is returned.  If a shippingdate is
passed the stock qty for that date is returned.

Examples:
 my $qty = $part->get_stock(bin_id => 52);

 $part->get_stock(shippingdate => DateTime->today->add(days => -5));

=back

=head1 AUTHORS

Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>,
Sven Schöling E<lt>s.schoeling@linet-services.deE<gt>

=cut