use strict;
use warnings FATAL => 'all';
use feature qw/say/;

use Mojolicious::Lite -signatures;

use URI;
use DBIx::Struct qw/connector hash_ref_slice/;
use Data::Dumper;

my $SITE_NAME = 'shrl.be/';

my $db_file = 'shrl.db';
DBIx::Struct::connect(sprintf('dbi:SQLite:dbname=%s', $db_file),"","");

# Render template "index.html.ep" from the DATA section
get '/' => sub ($c) {
    $c->render(template => 'index', page_data => {});
};

post '/' => sub ($c) {
    my $url = normalize_source_url($c->param('url'));
    my $shorten_path = write_url($url);
    my $shorten_url = $SITE_NAME.$shorten_path;
    $c->render(template => 'index', page_data => { url => $url, shorten_url => $shorten_url});
};

get '/:shorten_path' => sub ($c) {
    my $path = $c->param('shorten_path');
    my $url = get_url($path);
    if ($url) {
        $c->res->code(307);
        $c->redirect_to($url);
    } else {
        $c->render(status => 404, text => 'Page not found :(');
    }

};

app->start;


sub rand_str() {
    my @set = ('0' ..'9', 'A' .. 'z', 'a'..'z');
    my $str = join '' => map $set[rand @set], 1 .. 8;
    return $str;
}

sub normalize_source_url($source_url) {
    my $uri = URI->new($source_url);
    $uri = URI->new('http://'.$source_url) if !$uri->scheme;
    return $uri->as_string;
}

sub write_url($source_url) {

    my $shorten_path;
    eval {
        my $short_row = one_row('urls',{ source_url => $source_url});
        if (!$short_row) {
            $shorten_path = rand_str();
            new_row('urls' =>
                source_url => $source_url,
                shorten_path => $shorten_path,
            );

        } else {
            $shorten_path = $short_row->shorten_path;
        }
    };
    if ($@) { #may fall with deep recursion if no free names available
        if ($@ =~ /urls.shorten_path inserting /) {
            &write_url($source_url);
        }
        die $@;
    }
    return $shorten_path;

}

sub get_url($shorten_path) {
    my $row = one_row('urls', { shorten_path => $shorten_path});

    return $row->source_url if($row);

    return;
}