package NGCP::Panel::Controller::API::Contracts;
use Sipwise::Base;
use namespace::sweep;
use boolean qw(true);
use Data::HAL qw();
use Data::HAL::Link qw();
use HTTP::Headers qw();
use HTTP::Status qw(:constants);
use MooseX::ClassAttribute qw(class_has);
use NGCP::Panel::Utils::DateTime;
use NGCP::Panel::Utils::Contract;
use Path::Tiny qw(path);
BEGIN { extends 'Catalyst::Controller::ActionRole'; }
require Catalyst::ActionRole::ACL;
require Catalyst::ActionRole::CheckTrailingSlash;
require Catalyst::ActionRole::HTTPMethods;
require Catalyst::ActionRole::RequireSSL;

class_has 'api_description' => (
    is => 'ro',
    isa => 'Str',
    default => 
        'Defines a billing container for peerings and resellers. A <a href="#billingprofiles">Billing Profile</a> is assigned to a contract, and it has <a href="#contractbalances">Contract Balances</a> indicating the saldo of the contract for current and past billing intervals.'
);

class_has 'query_params' => (
    is => 'ro',
    isa => 'ArrayRef',
    default => sub {[
        {
            param => 'contact_id',
            description => 'Filter for contracts with a specific contact id',
            query => {
                first => sub {
                    my $q = shift;
                    { contact_id => $q };
                },
                second => sub {},
            },
        },
        {
            param => 'status',
            description => 'Filter for contracts with a specific status (except "terminated")',
            query => {
                first => sub {
                    my $q = shift;
                    { status => $q };
                },
                second => sub {},
            },
        },
    ]},
);

with 'NGCP::Panel::Role::API::Contracts';

class_has('resource_name', is => 'ro', default => 'contracts');
class_has('dispatch_path', is => 'ro', default => '/api/contracts/');
class_has('relation', is => 'ro', default => 'http://purl.org/sipwise/ngcp-api/#rel-contracts');

__PACKAGE__->config(
    action => {
        map { $_ => {
            ACLDetachTo => '/api/root/invalid_user',
            AllowedRole => 'admin',
            Args => 0,
            Does => [qw(ACL CheckTrailingSlash RequireSSL)],
            Method => $_,
            Path => __PACKAGE__->dispatch_path,
        } } @{ __PACKAGE__->allowed_methods }
    },
    action_roles => [qw(HTTPMethods)],
);

sub auto :Private {
    my ($self, $c) = @_;

    $self->set_body($c);
    $self->log_request($c);
}

sub GET :Allow {
    my ($self, $c) = @_;
    my $page = $c->request->params->{page} // 1;
    my $rows = $c->request->params->{rows} // 10;
    {
        my $contracts = $self->item_rs($c);
        my $total_count = int($contracts->count);
        $contracts = $contracts->search(undef, {
            page => $page,
            rows => $rows,
        });
        my (@embedded, @links);
        my $form = $self->get_form($c);
        for my $contract ($contracts->all) {
            push @embedded, $self->hal_from_contract($c, $contract, $form);
            push @links, Data::HAL::Link->new(
                relation => 'ngcp:'.$self->resource_name,
                href     => sprintf('/%s%d', $c->request->path, $contract->id),
            );
        }
        push @links,
            Data::HAL::Link->new(
                relation => 'curies',
                href => 'http://purl.org/sipwise/ngcp-api/#rel-{rel}',
                name => 'ngcp',
                templated => true,
            ),
            Data::HAL::Link->new(relation => 'profile', href => 'http://purl.org/sipwise/ngcp-api/'),
            Data::HAL::Link->new(relation => 'self', href => sprintf('/%s?page=%s&rows=%s', $c->request->path, $page, $rows));

        if(($total_count / $rows) > $page ) {
            push @links, Data::HAL::Link->new(relation => 'next', href => sprintf('/%s?page=%d&rows=%d', $c->request->path, $page + 1, $rows));
        }
        if($page > 1) {
            push @links, Data::HAL::Link->new(relation => 'prev', href => sprintf('/%s?page=%d&rows=%d', $c->request->path, $page - 1, $rows));
        }

        my $hal = Data::HAL->new(
            embedded => [@embedded],
            links => [@links],
        );
        $hal->resource({
            total_count => $total_count,
        });
        my $response = HTTP::Response->new(HTTP_OK, undef, 
            HTTP::Headers->new($hal->http_headers(skip_links => 1)), $hal->as_json);
        $c->response->headers($response->headers);
        $c->response->body($response->content);
        return;
    }
    return;
}

sub HEAD :Allow {
    my ($self, $c) = @_;
    $c->forward(qw(GET));
    $c->response->body(q());
    return;
}

sub OPTIONS :Allow {
    my ($self, $c) = @_;
    my $allowed_methods = $self->allowed_methods;
    $c->response->headers(HTTP::Headers->new(
        Allow => $allowed_methods->join(', '),
        Accept_Post => 'application/hal+json; profile=http://purl.org/sipwise/ngcp-api/#rel-'.$self->resource_name,
    ));
    $c->response->content_type('application/json');
    $c->response->body(JSON::to_json({ methods => $allowed_methods })."\n");
    return;
}

sub POST :Allow {
    my ($self, $c) = @_;

    my $guard = $c->model('DB')->txn_scope_guard;
    {
        my $schema = $c->model('DB');
        my $resource = $self->get_valid_post_data(
            c => $c, 
            media_type => 'application/json',
        );
        last unless $resource;

        # TODO: check type
        my $product_class = delete $resource->{type};
        unless($product_class eq "sippeering" || $product_class eq "reseller") {
            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'type', must be 'sippeering' or 'reseller'.");
            last;
        }

        unless(defined $resource->{billing_profile_id}) {
            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'billing_profile_id', not defined.");
            last;
        }


        $resource->{contact_id} //= undef;
        my $form = $self->get_form($c);
        last unless $self->validate_form(
            c => $c,
            resource => $resource,
            form => $form,
        );

        my $now = NGCP::Panel::Utils::DateTime::current_local;
        $resource->{create_timestamp} = $now;
        $resource->{modify_timestamp} = $now;
        my $contract;
        
        my $billing_profile_id = delete $resource->{billing_profile_id};
        my $billing_profile = $schema->resultset('billing_profiles')->find($billing_profile_id);
        unless($billing_profile) {
            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'billing_profile_id'.");
            last;
        }
        my $product = $schema->resultset('products')->find({ class => $product_class });
        unless($product) {
            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'type'.");
            last;
        }
        try {
            $contract = $schema->resultset('contracts')->create($resource);
        } catch($e) {
            $c->log->error("failed to create contract: $e"); # TODO: user, message, trace, ...
            $self->error($c, HTTP_INTERNAL_SERVER_ERROR, "Failed to create contract.");
            last;
        }

        if($contract->contact->reseller_id) {
            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "The contact_id is not a valid ngcp:systemcontacts item, but an ngcp:customercontacts item");
            last;
        }

        try {
            $contract->billing_mappings->create({
                billing_profile_id => $billing_profile->id,
                product_id => $product->id,
            });
            NGCP::Panel::Utils::Contract::create_contract_balance(
                c => $c,
                profile => $billing_profile,
                contract => $contract,
            );
        } catch($e) {
            $c->log->error("failed to create contract: $e"); # TODO: user, message, trace, ...
            $self->error($c, HTTP_INTERNAL_SERVER_ERROR, "Failed to create contract.");
            last;
        }

        $guard->commit;

        $c->response->status(HTTP_CREATED);
        $c->response->header(Location => sprintf('/%s%d', $c->request->path, $contract->id));
        $c->response->body(q());
    }
    return;
}

sub end : Private {
    my ($self, $c) = @_;

    $self->log_response($c);
}

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