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package SL::Dev::Inventory;

use strict;
use base qw(Exporter);
our @EXPORT = qw(create_warehouse_and_bins set_stock);

use SL::DB::Warehouse;
use SL::DB::Bin;
use SL::DB::Inventory;
use SL::DB::TransferType;
use SL::DB::Employee;
use SL::WH;
use DateTime;
use Data::Dumper;

sub create_warehouse_and_bins {
my (%params) = @_;

my $number_of_bins = $params{number_of_bins} || 5;
my $wh = SL::DB::Warehouse->new(description => $params{warehouse_description} || "Warehouse", invalid => 0);
for my $i ( 1 .. $number_of_bins ) {
$wh->add_bins( SL::DB::Bin->new(description => ( $params{bin_description} || "Bin" ) . " $i" ) );
}
$wh->save;
return ($wh, $wh->bins->[0]);
}

sub set_stock {
my (%params) = @_;

die "param part is missing or not an SL::DB::Part object" unless ref($params{part}) eq 'SL::DB::Part';
my $part = delete $params{part};
die "qty is missing" unless $params{qty} or $params{abs_qty};
die "need a bin or default bin" unless $part->warehouse_id or $part->bin_id or $params{bin} or $params{bin_id};

my ($warehouse_id, $bin_id);

if ( $params{bin} ) {
die "illegal param bin: " . Dumper($params{bin}) unless ref($params{bin}) eq 'SL::DB::Bin';
my $bin = delete $params{bin};
$bin_id = $bin->id;
$warehouse_id = $bin->warehouse_id;
} elsif ( $params{bin_id} ) {
my $bin = SL::DB::Manager::Bin->find_by(id => delete $params{bin_id});
$bin_id = $bin->id;
$warehouse_id = $bin->warehouse_id;
} elsif ( $part->bin_id ) {
$bin_id = $part->bin_id;
$warehouse_id = $part->warehouse_id;
} else {
die "can't determine bin and warehouse";
}

my $employee_id = delete $params{employee_id} // SL::DB::Manager::Employee->current->id;
die "Can't determine employee" unless $employee_id;

my $qty = delete $params{qty};

my $transfer_type_description;
my $transfer_type;
if ( $params{abs_qty} ) {
# determine the current qty and calculate the qty diff that needs to be applied
# if abs_qty is set then any value that was in $params{qty} is ignored/overwritten
my %get_stock_params;
$get_stock_params{bin_id} = $bin_id if $bin_id;
# $get_stock_params{warehouse_id} = $warehouse_id if $warehouse_id; # redundant
my $current_qty = $part->get_stock(%get_stock_params);
$qty = $params{abs_qty} - $current_qty;
}

if ( $qty > 0 ) {
$transfer_type_description = delete $params{transfer_type} // 'stock';
$transfer_type = SL::DB::Manager::TransferType->find_by( description => $transfer_type_description, direction => 'in' );
} else {
$transfer_type_description = delete $params{transfer_type} // 'shipped';
$transfer_type = SL::DB::Manager::TransferType->find_by( description => $transfer_type_description, direction => 'out' );
}
die "can't determine transfer_type" unless $transfer_type;

my $shippingdate;
if ( $params{shippingdate} ) {
$shippingdate = delete $params{shippingdate};
$shippingdate = $::locale->parse_date_to_object($shippingdate) unless ref($shippingdate) eq 'DateTime';
} else {
$shippingdate = DateTime->today;
}

my $unit;
if ( $params{unit} ) {
$unit = delete $params{unit};
$unit = SL::DB::Manager::Unit->find_by( name => $unit ) unless ref($unit) eq 'SL::DB::Unit';
$qty = $unit->convert_to($qty, $part->unit_obj);
}

my ($trans_id) = $part->db->dbh->selectrow_array("select nextval('id')", {});

SL::DB::Inventory->new(
parts_id => $part->id,
bin_id => $bin_id,
warehouse_id => $warehouse_id,
employee_id => $employee_id,
trans_type_id => $transfer_type->id,
comment => $params{comment},
shippingdate => $shippingdate,
qty => $qty,
trans_id => $trans_id,
)->save;
}

sub transfer_stock {
my (%params) = @_;

# check params:
die "missing params" unless ( $params{parts_id} or $params{part} ) and $params{from_bin} and $params{to_bin};

my $part;
if ( $params{parts_id} ) {
$part = SL::DB::Manager::Part->find_by( id => delete $params{parts_id} ) or die "illegal parts_id";
} else {
$part = delete $params{part};
}
die "illegal part" unless ref($part) eq 'SL::DB::Part';

my $from_bin = delete $params{from_bin};
my $to_bin = delete $params{to_bin};
die "illegal bins" unless ref($from_bin) eq 'SL::DB::Bin' and ref($to_bin) eq 'SL::DB::Bin';

my $qty = delete($params{qty});
die "qty must be > 0" unless $qty > 0;

# set defaults
my $transfer_type = SL::DB::Manager::TransferType->find_by(description => 'transfer') or die "can't determine transfer type";
my $employee_id = delete $params{employee_id} // SL::DB::Manager::Employee->current->id;

my $WH_params = {
'bestbefore' => undef,
'change_default_bin' => undef,
'chargenumber' => '',
'comment' => delete $params{comment} // '',
'dst_bin_id' => $to_bin->id,
'dst_warehouse_id' => $to_bin->warehouse_id,
'parts_id' => $part->id,
'qty' => $qty,
'src_bin_id' => $from_bin->id,
'src_warehouse_id' => $from_bin->warehouse_id,
'transfer_type_id' => $transfer_type->id,
};

WH->transfer($WH_params);

return 1;

# do it manually via rose:
# my $trans_id;

# my $db = SL::DB::Inventory->new->db;
# $db->with_transaction(sub{
# ($trans_id) = $db->dbh->selectrow_array("select nextval('id')", {});
# die "no trans_id" unless $trans_id;

# my %params = (
# shippingdate => delete $params{shippingdate} // DateTime->today,
# employee_id => $employee_id,
# trans_id => $trans_id,
# trans_type_id => $transfer_type->id,
# parts_id => $part->id,
# comment => delete $params{comment} || 'Umlagerung',
# );

# SL::DB::Inventory->new(
# warehouse_id => $from_bin->warehouse_id,
# bin_id => $from_bin->id,
# qty => $qty * -1,
# %params,
# )->save;

# SL::DB::Inventory->new(
# warehouse_id => $to_bin->warehouse_id,
# bin_id => $to_bin->id,
# qty => $qty,
# %params,
# )->save;
# }) or die $@ . "\n";
# return 1;
}

1;

__END__

=head1 NAME

SL::Dev::Inventory - create inventory-related objects for testing, with minimal
defaults

=head1 FUNCTIONS

=head2 C<create_warehouse_and_bins %PARAMS>

Creates a new warehouse and bins, and immediately saves them. Returns the
warehouse and the first bin object.
my ($wh, $bin) = SL::Dev::Inventory::create_warehouse_and_bins();

Create named warehouse with 10 bins:
my ($wh, $bin) = SL::Dev::Inventory::create_warehouse_and_bins(warehouse_description => 'Testlager',
bin_description => 'Testlagerplatz',
number_of_bins => 10,
);
To access the second bin:
my $bin2 = $wh->bins->[1];

=head2 C<set_stock %PARAMS>

Change the stock level of a certain part by creating an inventory event.
To access the updated onhand the part object needs to be loaded afterwards.

Mandatory params:
part - an SL::DB::Part object or a parts_id
qty | abs_qty
qty : the qty to increase of decrease the stock level by
abs_qty : sets stock level for a certain part to abs_qty by creating
a stock event with the current difference

Optional params:
bin_id | bin
shippingdate : may be a DateTime object or a string that needs to be parsed by parse_date_to_object.
unit : SL::DB::Unit object, or the name of an SL::DB::Unit object

If no bin is passed the default bin of the part is used, if that doesn't exist
either there will be an error.

C<set_stock> creates the SL::DB::Inventory object from scratch, rather
than passing params to WH->transfer_in or WH->transfer_out.

Examples:
my $part = SL::DB::Manager::Part->find_by(partnumber => '1');
SL::Dev::Inventory::set_stock(part => $part, qty => 5);
SL::Dev::Inventory::set_stock(part => $part, qty => -2);
$part->load;
$part->onhand; # 3

Set stock level of a part in a certain bin_id to 10:
SL::Dev::Inventory::set_stock(part => $part, bin_id => 99, abs_qty => 10);

Create 10 warehouses with 5 bins each, then create 100 parts and increase the
stock qty in a random bin by a random positive qty for each of the parts:

SL::Dev::Inventory::create_warehouse_and_bins(warehouse_description => "Testlager $_") for ( 1 .. 10 );
SL::Dev::Part::create_part(description => "Testpart $_")->save for ( 1 .. 100 );
my $bins = SL::DB::Manager::Bin->get_all;
SL::Dev::Inventory::set_stock(part => $_,
qty => int(rand(99))+1,
bin => $bins->[ rand @{$bins} ],
) foreach @{ SL::DB::Manager::Part->get_all() };

=head2 C<transfer_stock %PARAMS>

Transfers parts from one bin to another.

Mandatory params:
part | parts_id - an SL::DB::Part object or a parts_id
from_bin - an SL::DB::Bin object
to_bin qty - an SL::DB::Bin object

Optional params: shippingdate

The unit is always base_unit and there is no check for negative stock values.

Example: Create a warehouse and bins, a part, stock the part and then move some
of the stock to a different bin inside the same warehouse:

my ($wh, $bin) = SL::Dev::Inventory::create_warehouse_and_bins();
my $part = SL::Dev::Part::create_part->save;
SL::Dev::Inventory::set_stock(part => $part, bin_id => $wh->bins->[2]->id, qty => 5);
SL::Dev::Inventory::transfer_stock(part => $part,
from_bin => $wh->bins->[2],
to_bin => $wh->bins->[4],
qty => 3
);
$part->get_stock(bin_id => $wh->bins->[4]->id); # 3.00000
$part->get_stock(bin_id => $wh->bins->[2]->id); # 2.00000

=head1 BUGS

Nothing here yet.

=head1 AUTHOR

G. Richardson E<lt>grichardson@kivitendo-premium.deE<gt>

=cut
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