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 Data::Record qw();
use DateTime::Format::HTTP qw();
use DateTime::Format::RFC3339 qw();
use Digest::SHA3 qw(sha3_256_base64);
use HTTP::Headers qw();
use HTTP::Status qw(:constants);
use JSON qw();
use MooseX::ClassAttribute qw(class_has);
use NGCP::Panel::Utils::ValidateJSON qw();
use Path::Tiny qw(path);
use Regexp::Common qw(delimited); # $RE{delimited}
use Safe::Isa qw($_isa);
BEGIN { extends 'Catalyst::Controller::ActionRole'; }
require Catalyst::ActionRole::ACL;
require Catalyst::ActionRole::CheckTrailingSlash;
require Catalyst::ActionRole::HTTPMethods;
require Catalyst::ActionRole::QueryParameter;
require Catalyst::ActionRole::RequireSSL;

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

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 => 'api_admin',
            Args => 0,
            Does => [qw(ACL CheckTrailingSlash RequireSSL)],
            Method => $_,
            Path => __PACKAGE__->dispatch_path,
        } } @{ __PACKAGE__->allowed_methods }
    },
    action_roles => [qw(HTTPMethods)],
);

sub GET :Allow :Args(0) {
    my ($self, $c) = @_;
    my $page = $c->request->params->{page} // 1;
    my $rows = $c->request->params->{rows} // 10;
    {
        last if $self->cached($c);
        my $contracts = $c->model('DB')->resultset('contracts');
        $self->last_modified($contracts->get_column('modify_timestamp')->max_rs->single->modify_timestamp);
        my $total_count = int($contracts->count);
        $contracts = $contracts->search(undef, {
            page => $page,
            rows => $rows,
        });
        my (@embedded, @links);
        for my $contract ($contracts->search({}, {order_by => {-asc => 'me.id'}, prefetch => ['contact']})->all) {
            push @embedded, $self->hal_from_contract($contract);
            push @links, Data::HAL::Link->new(
                relation => 'ngcp:contracts',
                href     => sprintf('/api/contracts/%d', $contract->id),
            );
        }
        push @links,
            Data::HAL::Link->new(
                relation => 'curies',
                href => 'http://purl.org/sipwise/ngcp-api/#rel-{rel}',
                name => 'ngcp',
                templated => true,
            ),
            Data::HAL::Link->new(relation => 'profile', href => 'http://purl.org/sipwise/ngcp-api/'),
            Data::HAL::Link->new(relation => 'self', href => "/api/contracts/?page=$page&rows=$rows");
        
        if(($total_count / $rows) > $page ) {
            push @links, Data::HAL::Link->new(relation => 'next', href => "/api/contracts/?page=".($page+1)."&rows=$rows"),
        }
        if($page > 1) {
            push @links, Data::HAL::Link->new(relation => 'prev', href => "/api/contracts/?page=".($page-1)."&rows=$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(
            (map { # XXX Data::HAL must be able to generate links with multiple relations
                s|rel="(http://purl.org/sipwise/ngcp-api/#rel-contracts)"|rel="item $1"|;
                s/rel=self/rel="collection self"/;
                $_
            } $hal->http_headers),
            $hal->http_headers,
            Cache_Control => 'no-cache, private',
            ETag => $self->etag($hal->as_json),
            Expires => DateTime::Format::HTTP->format_datetime($self->expires),
            Last_Modified => DateTime::Format::HTTP->format_datetime($self->last_modified),
        ), $hal->as_json);
        $c->cache->set($c->request->uri->canonical->as_string, $response, { expires_at => $self->expires->epoch });
        $c->response->headers($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-contracts',
        Content_Language => 'en',
    ));
    $c->response->content_type('application/json');
    $c->response->body(JSON::to_json({ methods => $allowed_methods })."\n");
    return;
}

sub POST : Allow {
    my ($self, $c) = @_;
    {
        my $resource = $self->get_valid_post_data(
            c => $c,
            media_type => 'application/json',
        );
	    last unless $resource;

    	# this is only accessible by admins, so on other roles check
        my $contract_form = NGCP::Panel::Form::Contract::PeeringReseller->new;
        last unless $self->validate_form(
            c => $c,
            resource => $resource,
            form => $contract_form,
        );
	    my $contact = $c->model('DB')->resultset('contacts')->find($resource->{contact_id});
	    unless($contact) {
            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid contact_id."); # TODO: log error, ...
            last;
	    }
        if($contact->reseller_id) {
            # TODO: should be allow to create customer contracts here as well? If not, reject
            # a contact with a reseller!

            #$self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid contact for system contract, must not belong to a reseller."); # TODO: log error, ...
            #last;
        }

        # TODO: do we need to use our DateTime utils for localized "now"?
        my $now = DateTime->now;
        $resource->{create_timestamp} = $now;
        $resource->{modify_timestamp} = $now;
        my $contract = $c->model('DB')->resultset('contracts')->create($resource);

        $c->cache->remove($c->request->uri->canonical->as_string);
        $c->response->status(HTTP_CREATED);
        $c->response->header(Location => sprintf('/api/contracts/%d', $contract->id));
        $c->response->body(q());
    }
    return;
}

sub hal_from_contract : Private {
    my ($self, $contract) = @_;
    # XXX invalid 00-00-00 dates
    my %resource = $contract->get_inflated_columns;
    my $id = delete $resource{id};

    my $hal = Data::HAL->new(
        links => [
            Data::HAL::Link->new(
                relation => 'curies',
                href => 'http://purl.org/sipwise/ngcp-api/#rel-{rel}',
                name => 'ngcp',
                templated => true,
            ),
            Data::HAL::Link->new(relation => 'collection', href => '/api/contracts/'),
            Data::HAL::Link->new(relation => 'profile', href => 'http://purl.org/sipwise/ngcp-api/'),
            Data::HAL::Link->new(relation => 'self', href => "/api/contracts/$id"),
            $contract->contact
                ? Data::HAL::Link->new(
                    relation => 'ngcp:contacts',
                    href => sprintf('/api/contacts/%d', $contract->contact_id),
                ) : (),
        ],
        relation => 'ngcp:contracts',
    );

    my %fields = map { $_ => undef } qw(external_id status);
    for my $k (keys %resource) {
        delete $resource{$k} unless exists $fields{$k};
        $resource{$k} = DateTime::Format::RFC3339->format_datetime($resource{$k}) if $resource{$k}->$_isa('DateTime');
    }
    $hal->resource({%resource});
    return $hal;
}

sub valid_id : Private {
    my ($self, $c, $id) = @_;
    return 1 if $id->is_integer;
    $c->response->status(HTTP_BAD_REQUEST);
    $c->response->header('Content-Language' => 'en');
    $c->response->content_type('application/xhtml+xml');
    $c->stash(template => 'api/invalid_query_parameter.tt', key => 'id');
    return;
}

sub end : Private {
    my ($self, $c) = @_;
    $c->forward(qw(Controller::Root render));
    $c->response->content_type('')
        if $c->response->content_type =~ qr'text/html'; # stupid RenderView getting in the way
    if (@{ $c->error }) {
        my $msg = join ', ', @{ $c->error };
        $c->log->error($msg);
        $self->error($c, HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error");
        $c->clear_errors;
    }
}


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