package WebService::ForecastIo;
use Moo;
use 5.10.0;
use Types::Standard -types,'slurpy';
use Type::Utils -all;
use Types::URI 'Uri';
use Types::DateTime 'DateTimeT';
use Type::Params;
use WebService::ForecastIo::Response;
use DateTime::TimeZone;
use namespace::autoclean;

has base_uri => (
    is => 'ro',
    isa => Uri,
    default => 'https://api.forecast.io/forecast',
    coerce => Uri->coercion,
);

has api_key => (
    is => 'ro',
    isa => Str,
    required => 1,
);

has user_agent => (
    is => 'lazy',
    isa => duck_type(['get']),
);
sub _build_user_agent {
    require LWP::UserAgent;
    my $agent = LWP::UserAgent->new(
        agent => __PACKAGE__ . ' version ' . ($WebService::ForecastIo::VERSION // 'devel' ),
        env_proxy => 1,
        keep_alive => 1,
    );
    $agent->default_header( 'Accept-Encoding' => 'gzip' );
    return $agent;
}

sub _make_request_uri {
    my ($self,$opts) = @_;

    my ($lat,$lon,$time) = delete @$opts{qw(latitude longitude time)};

    my $req_uri = $self->base_uri->clone;

    my $time_str;
    if ($time) {
        $time_str = $time->iso8601;
        my $tz = $time->time_zone;
        if ($tz->is_utc) { $time_str .= 'Z' }
        elsif (not $tz->is_floating) {
            $time_str .= DateTime::TimeZone->offset_as_string(
                $tz->offset_for_datetime($time)
            );
        }
    }

    $req_uri->path_segments(
        grep { length($_) }
            $req_uri->path_segments,
            $self->api_key,
            "$lat,$lon",
            $time_str,
        );

    if ($opts->{exclude}) {
        $opts->{exclude} = join ',',@{$opts->{exclude}};
    }

    $req_uri->query_form($opts);

    return $req_uri;
}

my $units_type = enum [qw(us si ca uk auto)];
my $block_type = enum [qw(currently minutely hourly daily alerts flags sources)];

sub request {
    state $argcheck = compile(
        Object, Dict[
            latitude => Num,
            longitude => Num,
            time => Optional[DateTimeT],
            units => Optional[$units_type],
            exclude => Optional[ArrayRef[$block_type]],
            raw => Optional[Bool],
        ],
    );
    my ($self,$opts) = $argcheck->(@_);
    $opts->{units} //= 'si';
    $opts->{exclude} //= [];
    $opts->{raw} //= 0;

    my $uri = $self->_make_request_uri({%$opts});

    my $response = $self->user_agent->get($uri);
    if ($response->is_success) {
        my $json = $response->decoded_content;
        return $json if $opts->{raw};
        my $res = WebService::ForecastIo::Response->new($json);
        return wantarray ? ($res,$json) : $res
    }
    else {
        die $response->status_line
    }
}

1;