#!/usr/bin/env perl
use 5.024;
use warnings;
use utf8;

use Data::Dump qw( pp );
use LWP::Authen::OAuth2;
use JSON qw( decode_json );
use List::Util qw( all );

my ($profileid, $clanmatch) = @ARGV;  # clan host and name
$profileid and $profileid =~ /\A\d+\z/
	or die "Usage: $0 <profile id> [<clan name>]\n";

my $bliz = LWP::Authen::OAuth2->new(
	client_id               => '7f0f95ac9529474f854ee8d68a12c3e0',
	client_secret           => 'Kfa8n98UAaDo4brOeqxe9C2kJE9pqpSd',
	token_endpoint          => 'https://us.battle.net/oauth/token',
	request_required_params => [qw( client_id client_secret grant_type )],
);
$bliz->request_tokens(grant_type => 'client_credentials');

sub blizget {
	my $args = join('/', @_);
	my $res = $bliz->get("https://us.api.blizzard.com/sc2/$args");
	$res->is_success or die $res->status_line;
	my $json = $res->decoded_content;
	return decode_json($json);
}

# find largest group consisting entirely of clan members
# prefer deprecated interface to prevent costly ladder search
my $ladderdata = blizget(legacy => profile => 2 => 1 => $profileid => 'ladders');
my @ladders = (
	sort { $b->{characters}->@* <=> $a->{characters}->@* } # population desc
	grep {
		!$clanmatch or
		all { fc $_->{clanName} eq fc $clanmatch } $_->{characters}->@*
	} # members
	grep { $_->{ladder}->[0]->{division} }
	$ladderdata->{currentSeason}->@*
) or die "No matching groups found\n";
my @members = $ladders[0]->{characters}->@*;
my %memberidx = map { $members[$_]->{id} => $_ } 0 .. $#members;

say JSON->new->canonical->pretty->encode({
	name     => $members[0]->{clanName},
	tag      => $members[0]->{clanTag},
	ladders  => [map {{
		league   => lc $_->{ladder}->[0]->{league},
		division => $_->{ladder}->[0]->{ladderName},
		rank     => $_->{ladder}->[0]->{rank},
		members  => [map { $memberidx{$_->{id}} } $_->{characters}->@*],
	}} @ladders],
	members  => [map {
		blizget(metadata => profile => 2 => 1 => $_->{id})
		# lacks mmr, fav race (available in new api)
	} @members],
});