package Koha::REST::V1::Patrons::Account;

# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Koha is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Koha; if not, see <http://www.gnu.org/licenses>.

use Modern::Perl;

use Mojo::Base 'Mojolicious::Controller';

use Koha::Patrons;

use Try::Tiny qw( catch try );

=head1 NAME

Koha::REST::V1::Patrons::Account

=head1 API

=head2 Methods

=head3 get

Controller function that handles retrieving a patron's account balance

=cut

sub get {
    my $c = shift->openapi->valid_input or return;

    my $patron = Koha::Patrons->find( $c->param('patron_id') );

    unless ($patron) {
        return $c->render(
            status  => 404,
            openapi => { error => "Patron not found." }
        );
    }

    return try {
        my $account = $patron->account;

        # get outstanding debits and credits
        my $debits  = $account->outstanding_debits;
        my $credits = $account->outstanding_credits;

        return $c->render(
            status  => 200,
            openapi => {
                balance            => $account->balance,
                outstanding_debits => {
                    total => $debits->total_outstanding,
                    lines => $c->objects->to_api($debits),
                },
                outstanding_credits => {
                    total => $credits->total_outstanding,
                    lines => $c->objects->to_api($credits),
                }
            }
        );
    }
    catch {
        $c->unhandled_exception($_);
    };
}

=head3 list_credits

=cut

sub list_credits {
    my $c = shift->openapi->valid_input or return;

    my $patron = Koha::Patrons->find( $c->param('patron_id') );

    unless ($patron) {
        return $c->render(
            status  => 404,
            openapi => { error => "Patron not found." }
        );
    }

    return try {
        my $credits = $c->objects->search( $patron->account->credits );
        return $c->render( status => 200, openapi => $credits );
    }
    catch {
        $c->unhandled_exception($_);
    };
}

=head3 add_credit

Controller function that handles adding a credit to a patron's account

=cut

sub add_credit {
    my $c = shift->openapi->valid_input or return;

    my $patron = Koha::Patrons->find( $c->param('patron_id') );
    my $user   = $c->stash('koha.user');

    unless ($patron) {
        return $c->render(
            status  => 404,
            openapi => { error => "Patron not found." }
        );
    }

    my $account = $patron->account;
    my $body    = $c->req->json;

    return try {
        my $credit_type =
          $body->{credit_type} || 'PAYMENT';    # default to 'PAYMENT'
        my $amount = $body->{amount};    # mandatory, validated by openapi

        unless ( $amount > 0 )
        {    # until we support newer JSON::Validator and thus minimumExclusive
            Koha::Exceptions::BadParameter->throw( { parameter => 'amount' } );
        }

        # read the rest of the params
        my $payment_type = $body->{payment_type};
        my $description  = $body->{description};
        my $note         = $body->{note};
        my $library_id   = $body->{library_id};

        if ( C4::Context->preference("RequirePaymentType") && !defined($payment_type) ) {
            Koha::Exceptions::Account::PaymentTypeRequired->throw();
        }

        my $credit = $account->add_credit(
            {
                amount       => $amount,
                type         => $credit_type,
                payment_type => $payment_type,
                description  => $description,
                note         => $note,
                user_id      => $user->id,
                interface    => 'api',
                library_id   => $library_id
            }
        );
        $credit->discard_changes;

        my $date = $body->{date};
        $credit->date($date)->store
          if $date;

        my $debits_ids = $body->{account_lines_ids};
        my $debits;
        $debits = Koha::Account::Lines->search(
            { accountlines_id => { -in => $debits_ids } } )
          if $debits_ids;

        if ($debits) {

            # pay them!
            $credit = $credit->apply( { debits => [ $debits->as_list ] } );
        }

        if ( $credit->amountoutstanding != 0 ) {
            my $outstanding_debits = $account->outstanding_debits;
            $credit->apply( { debits => [ $outstanding_debits->as_list ] } );
        }

        $credit->discard_changes;

        return $c->render(
            status  => 201,
            openapi => $c->objects->to_api($credit),
        );
    }
    catch {
        $c->unhandled_exception($_);
    };
}

=head3 list_debits

=cut

sub list_debits {
    my $c = shift->openapi->valid_input or return;

    my $patron = Koha::Patrons->find( $c->param('patron_id') );

    unless ($patron) {
        return $c->render(
            status  => 404,
            openapi => { error => "Patron not found." }
        );
    }

    return try {
        my $debits = $c->objects->search( $patron->account->debits );
        return $c->render( status => 200, openapi => $debits );
    }
    catch {
        $c->unhandled_exception($_);
    };
}

=head3 add_debit

=cut

sub add_debit {
    my $c = shift->openapi->valid_input or return;

    my $patron = Koha::Patrons->find( $c->param('patron_id') );

    unless ($patron) {
        return $c->render(
            status  => 404,
            openapi => { error => "Patron not found." }
        );
    }

    return try {
        my $data =
          Koha::Account::Debit->new_from_api( $c->req->json )
          ->unblessed;

        $data->{library_id}       = delete $data->{branchcode};
        $data->{type}             = delete $data->{debit_type_code};
        $data->{cash_register}    = delete $data->{register_id};
        $data->{item_id}          = delete $data->{itemnumber};
        $data->{transaction_type} = delete $data->{payment_type};
        $data->{interface}        = 'api'
          ; # Should this always be API, or should we allow the API consumer to choose?
        $data->{user_id} = $patron->borrowernumber
          ; # Should this be API user OR staff the API may be acting on behalf of?

        my $debit = $patron->account->add_debit($data);
        $debit = Koha::Account::Debit->_new_from_dbic($debit->{_result});

        $c->res->headers->location(
            $c->req->url->to_string . '/' . $debit->id );
        $debit->discard_changes;

        return $c->render(
            status  => 201,
            openapi => $c->objects->to_api($debit),
        );
    }
    catch {
        if ( blessed $_ ) {
            if ( $_->isa('Koha::Exceptions::Account::RegisterRequired') ) {
                return $c->render(
                    status  => 400,
                    openapi => { error => $_->description }
                );
            }
            elsif ( $_->isa('Koha::Exceptions::Account::AmountNotPositive') ) {
                return $c->render(
                    status => 400,
                    openapi => { error => $_->description }
                );
            }
            elsif ( $_->isa('Koha::Exceptions::Account::UnrecognisedType') ) {
                return $c->render(
                    status => 400,
                    openapi => { error => $_->description }
                );
            }
        }

        $c->unhandled_exception($_);
    };
}

1;