package Trog::Routes::HTML;

use strict;
use warnings;

no warnings 'experimental';
use feature qw{signatures state};

use Errno qw{ENOENT};
use File::Touch();
use List::Util();
use List::MoreUtils();
use Capture::Tiny qw{capture};
use HTML::SocialMeta;

use Trog::Utils;
use Trog::Config;
use Trog::Data;

my $conf = Trog::Config::get();
my $template_dir = 'www/templates';
my $theme_dir = '';
$theme_dir = "themes/".$conf->param('general.theme') if $conf->param('general.theme') && -d "www/themes/".$conf->param('general.theme');
my $td = $theme_dir ? "/$theme_dir" : '';

use lib 'www';

our $landing_page  = 'default.tx';
our $htmltitle     = 'title.tx';
our $midtitle      = 'midtitle.tx';
our $rightbar      = 'rightbar.tx';
our $leftbar       = 'leftbar.tx';
our $topbar        = 'topbar.tx';
our $footbar       = 'footbar.tx';

# Note to maintainers: never ever remove backends from this list.
# the auth => 1 is a crucial protection, even with forbidden() guards in these routes.
our %routes = (
    default => {
        callback => \&Trog::Routes::HTML::setup,
    },
    '/' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::index,
    },
    #Deal with most indexDocument directives interfering with proxied requests to /
    '/index.html' => {
        method   => 'GET',
        callback  => \&Trog::Routes::HTML::index,
    },
    '/index.php'  => {
        method => 'GET',
        callback => \&Trog::Routes::HTML::index,
    },
# This should only be enabled to debug
#    '/setup' => {
#        method   => 'GET',
#        callback => \&Trog::Routes::HTML::setup,
#    },
    '/login' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::login,
    },
    '/logout' => {
        method => 'GET',
        callback => \&Trog::Routes::HTML::logout,
    },
    '/auth' => {
        method   => 'POST',
        nostatic => 1,
        callback => \&Trog::Routes::HTML::login,
    },
    '/post/save' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::post_save,
    },
    '/post/delete' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::post_delete,
    },
    '/config/save' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::config_save,
    },
    '/themeclone' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::themeclone,
    },
    '/profile' => {
        method   => 'POST',
        auth     => 1,
        callback => \&Trog::Routes::HTML::profile,
    },
    '/manual' => {
        method => 'GET',
        auth   => 1,
        callback => \&Trog::Routes::HTML::manual,
    },
    '/lib/(.*)' => {
        method => 'GET',
        auth   => 1,
        captures => ['module'],
        callback => \&Trog::Routes::HTML::manual,
    },

    #TODO transform into posts?
    '/sitemap', => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
    },
    '/sitemap_index.xml', => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1 },
    },
    '/sitemap_index.xml.gz', => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, compressed => 1 },
    },
    '/sitemap/static.xml' => {
        method => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, map => 'static' },
    },
    '/sitemap/static.xml.gz' => {
        method => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, compressed => 1, map => 'static' },
    },
    '/sitemap/(.*).xml' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1 },
        captures => ['map'],
    },
    '/sitemap/(.*).xml.gz' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::sitemap,
        data     => { xml => 1, compressed => 1},
        captures => ['map'],
    },
    '/robots.txt' => {
        method    => 'GET',
        callback  => \&Trog::Routes::HTML::robots,
    },
    '/humans.txt' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::posts,
        data     => { tag => ['about'] },
    },
    '/styles/avatars.css' => {
        method   => 'GET',
        callback => \&Trog::Routes::HTML::avatars,
        data     => { tag => ['about'] },
    },
);

# Grab theme routes
my $themed = 0;
if ($theme_dir) {
    my $theme_mod = "$theme_dir/routes.pm";
    if (-f "www/$theme_mod" ) {
        require $theme_mod;
        @routes{keys(%Theme::routes)} = values(%Theme::routes);
        $themed = 1;
    }
}

=head1 PRIMARY ROUTE

=head2 index

Implements the primary route used by all pages not behind auth.
Most subsequent functions simply pass content to this function.

=cut

sub index ($query,$render_cb, $content = '', $i_styles = []) {
    $query->{theme_dir}  = $td;

    my $processor = Text::Xslate->new(
        path   => $template_dir,
    );

    my $t_processor;
    $t_processor = Text::Xslate->new(
        path =>  "www/$theme_dir/templates",
    ) if $theme_dir;

    $content ||= _pick_processor("templates/$landing_page",$processor,$t_processor)->render($landing_page,$query);

    my @styles = ('/styles/avatars.css');
    if ($theme_dir) {
        if ($query->{embed}) {
            unshift(@styles, _themed_style("embed.css")) if -f 'www/'._themed_style("embed.css");
        }
        unshift(@styles, _themed_style("screen.css"))    if -f 'www/'._themed_style("screen.css");
        unshift(@styles, _themed_style("print.css"))     if -f 'www/'._themed_style("print.css");
        unshift(@styles, _themed_style("structure.css")) if -f 'www/'._themed_style("structure.css");
    }
    push( @styles, @$i_styles );

    #TODO allow theming of print css
    my $search_info = Trog::Data->new($conf);
    my @series = _get_series(0, $search_info);

    my $title = $query->{primary_post}{title} // $query->{title} // $Theme::default_title // 'tCMS';

    # Handle link "unfurling" correctly
    my ($default_tags, $meta_desc, $meta_tags) = _build_social_meta($query,$title);

    #Do embed content
    my $tmpl = $query->{embed} ? 'embed.tx' : 'index.tx';
    return $render_cb->( $tmpl, {
        code           => $query->{code},
        user           => $query->{user},
        search_lang    => $search_info->lang(),
        search_help    => $search_info->help(),
        route          => $query->{route},
        domain         => $query->{domain},
        theme_dir      => $td,
        content        => $content,
        title          => $title,
        htmltitle      => _pick_processor("templates/$htmltitle" ,$processor,$t_processor)->render($htmltitle,$query),
        midtitle       => _pick_processor("templates/$midtitle"  ,$processor,$t_processor)->render($midtitle,$query),
        rightbar       => _pick_processor("templates/$rightbar"  ,$processor,$t_processor)->render($rightbar,$query),
        leftbar        => _pick_processor("templates/$leftbar"   ,$processor,$t_processor)->render($leftbar,$query),
        topbar         => _pick_processor("templates/$topbar"    ,$processor,$t_processor)->render($topbar,$query),
        footbar        => _pick_processor("templates/$footbar"   ,$processor,$t_processor)->render($footbar,$query),
        categories     => \@series,
        stylesheets    => \@styles,
        show_madeby    => $Theme::show_madeby ? 1 : 0,
        embed          => $query->{embed} ? 1 : 0,
        embed_video    => $query->{primary_post}{is_video},
        default_tags   => $default_tags,
        meta_desc      => $meta_desc,
        meta_tags      => $meta_tags,
    deflate        => $query->{deflate},
    });
}

sub _build_social_meta ($query,$title) {
    return (undef,undef,undef) unless $query->{social_meta} && $query->{route} && $query->{domain};

    my $default_tags = $Theme::default_tags;
    $default_tags .= ','.join(',',@{$query->{primary_post}->{tags}}) if $default_tags && $query->{primary_post}->{tags};

    my $meta_desc  = $query->{primary_post}{data} // $Theme::description // "tCMS Site";
    $meta_desc = Trog::Utils::strip_and_trunc($meta_desc);

    my $meta_tags = '';
    my $card_type = 'summary';
    $card_type = 'featured_image' if $query->{primary_post} && $query->{primary_post}{is_image};
    $card_type = 'player'         if $query->{primary_post} && $query->{primary_post}{is_video};

    my $image = $Theme::default_image ? "https://$query->{domain}/$td/$Theme::default_image" : '';
    $image = "https://$query->{domain}/$query->{primary_post}{preview}" if $query->{primary_post} && $query->{primary_post}{preview};
    $image = "https://$query->{domain}/$query->{primary_post}{href}"    if $query->{primary_post} && $query->{primary_post}{is_image};

    my $primary_route =  "https://$query->{domain}/$query->{route}";
    $primary_route =~  s/[\/]+/\//g;

    my $display_name = $Theme::display_name // 'Another tCMS Site';

    my $extra_tags ='';

    my %sopts = (
        site_name   => $display_name,
        app_name    => $display_name,
        title       => $title,
        description => $meta_desc,
        url         => $primary_route,
    );
    $sopts{site}  = $Theme::twitter_account if $Theme::twitter_account;
    $sopts{image} = $image if $image;
    $sopts{fb_app_id} = $Theme::fb_app_id if $Theme::fb_app_id;
    if ($query->{primary_post} && $query->{primary_post}{is_video}) {
    #$sopts{player} = "$primary_route?embed=1";
    $sopts{player} = "https://$query->{domain}/$query->{primary_post}{href}";
        #XXX don't hardcode this
        $sopts{player_width} = 1280;
        $sopts{player_height} = 720;
    $extra_tags .= "<meta property='og:video:type' content='$query->{primary_post}{content_type}' />\n";
    }
    my $social = HTML::SocialMeta->new(%sopts);
    $meta_tags = eval { $social->create($card_type) };
    $meta_tags =~ s/content="video"/content="video:other"/mg if $meta_tags;
    $meta_tags .= $extra_tags if $extra_tags;

    print STDERR "WARNING: Theme misconfigured, social media tags will not be included\n$@\n" if $theme_dir && !$meta_tags;
    return ($default_tags, $meta_desc, $meta_tags);
}

=head1 ADMIN ROUTES

These are things that issue returns other than 200, and are not directly accessible by users via any defined route.

=head2 notfound, forbidden, badrequest

Implements the 4XX status codes.  Override templates named the same for theming this.

=cut

sub _generic_route ($rname, $code, $title, $query, $render_cb) {
    $query->{code} = $code;

    my $processor = Text::Xslate->new(
        path   => _dir_for_resource("$rname.tx"),
    );

    $query->{title} = $title;
    my $styles = _build_themed_styles("$rname.css");
    my $content = $processor->render("$rname.tx", {
        title    => $title,
        route    => $query->{route},
        user     => $query->{user},
        styles   => $styles,
    deflate  => $query->{deflate},
    });
    return Trog::Routes::HTML::index($query, $render_cb, $content, $styles);
}

sub notfound (@args) {
    return _generic_route('notfound',404,"Return to sender, Address unknown", @args);
}

sub forbidden (@args) {
    return _generic_route('forbidden', 403, "STAY OUT YOU RED MENACE", @args);
}

sub badrequest (@args) {
    return _generic_route('badrequest', 400, "Bad Request", @args);
}

sub redirect ($to) {
    return [302, ["Location" => $to],['']]
}

sub redirect_permanent ($to) {
    return [301, ["Location" => $to], ['']];
}

=head1 NORMAL ROUTES

These are expected to either return a 200, or redirect to something which does.

=head2 robots

Return an appropriate robots.txt

=cut

sub robots ($query, $render_cb) {
    my $processor = Text::Xslate->new(
        path   => $template_dir,
    );
    return [200, ["Content-type:text/plain\n"],[$processor->render('robots.tx', { domain => $query->{domain} })]];
}

=head2 setup

One time setup page; should only display to the first user to visit the site which we presume to be the administrator.

=cut

sub setup ($query, $render_cb) {
    File::Touch::touch("config/setup");
    return $render_cb->('notconfigured.tx', {
        title => 'tCMS Requires Setup to Continue...',
        stylesheets => _build_themed_styles('notconfigured.css'),
    });
}

=head2 login

Sets the user cookie if the provided user exists, or sets up the user as an admin with the provided credentials in the event that no users exist.

=cut

sub login ($query, $render_cb) {

    # Redirect if we actually have a logged in user.
    # Note to future me -- this user value is overwritten explicitly in server.psgi.
    # If that ever changes, you will die
    $query->{to} //= $query->{route};
    $query->{to} = '/config' if $query->{to} eq '/login';
    if ($query->{user}) {
        return $routes{$query->{to}}{callback}->($query,$render_cb);
    }

    #Check and see if we have no users.  If so we will just accept whatever creds are passed.
    $query->{'hasusers'} = -f "config/has_users";
    my $btnmsg = $query->{'hasusers'} ? "Log In" : "Register";

    my @headers;
    my $do_auth = grep { $query->{$_} } qw{username extAuthProvider};
    my $failed = -1;

    if($do_auth) {
        my $auth_module = "Default";
        $auth_module = ucfirst($query->{'extAuthProvider'}) if($query->{'extAuthProvider'});
        require Trog::Authz;
        my $auth_obj = Trog::Authz::do_auth_for( $auth_module, $query );
        $failed  = $auth_obj->failed();
        @headers = $auth_obj->headers();
    }

    return $render_cb->('login.tx', {
        title       => 'tCMS 2 ~ Login',
        to          => $query->{to},
        failure     => int( $failed ),
        message     => int( $failed ) == 0 ? "Login Successful, Redirecting..." : "Login Failed.",
        btnmsg      => $btnmsg,
        hasusers    => $query->{'hasusers'} ? 1 : 0,
        stylesheets => _build_themed_styles('login.css'),
        theme_dir   => $td,
    }, @headers);
}

=head2 logout

Deletes your users' session and opens the index.

=cut

sub logout ($query, $render_cb) {
    Trog::Auth::killsession($query->{user}) if $query->{user};
    delete $query->{user};
    return Trog::Routes::HTML::index($query,$render_cb);
}

=head2 config

Renders the configuration page, or redirects you back to the login page.

=cut

sub config ($query, $render_cb) {
    if (!$query->{user}) {
        return login($query,$render_cb);
    }
    #NOTE: we are relying on this to skip the ACL check with 'admin', this may not be viable in future?
    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};

    my $css   = _build_themed_styles('config.css');
    my $js    = _build_themed_scripts('post.js');

    $query->{failure} //= -1;
    my @series = _get_series(1);

    return $render_cb->('config.tx', {
        title              => 'Configure tCMS',
        theme_dir          => $td,
        stylesheets        => $css,
        scripts            => $js,
        categories         => \@series,
        themes             => _get_themes() || [],
        data_models        => _get_data_models(),
        current_theme      => $conf->param('general.theme') // '',
        current_data_model => $conf->param('general.data_model') // 'DUMMY',
        message     => $query->{message},
        failure     => $query->{failure},
        to          => '/config',
    });
}

sub _get_series($edit=0,$search_info=0) {
    $search_info ||= Trog::Data->new($conf);
    my @series = $search_info->get(
        acls    => [qw{public}],
        tags    => [qw{topbar}],
        limit   => 10,
        page    => 1,
    );
    @series = map { $_->{local_href} = "/post$_->{local_href}"; $_ } @series if $edit;
    return @series;
}

sub _get_themes {
    my $dir = 'www/themes';
    opendir(my $dh, $dir) || do { die "Can't opendir $dir: $!" unless $!{ENOENT} };
    my @tdirs = grep { !/^\./ && -d "$dir/$_" } readdir($dh);
    closedir $dh;
    return \@tdirs;
}

sub _get_data_models {
    my $dir = 'lib/Trog/Data';
    opendir(my $dh, $dir) || die "Can't opendir $dir: $!";
    my @dmods = map { s/\.pm$//g; $_ } grep { /\.pm$/ && -f "$dir/$_" } readdir($dh);
    closedir $dh;
    return \@dmods
}

=head2 config_save

Implements /config/save route.  Saves what little configuration we actually use to ~/.tcms/tcms.conf

=cut

sub config_save ($query, $render_cb) {
    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};

    $conf->param( 'general.theme',      $query->{theme} )      if defined $query->{theme};
    $conf->param( 'general.data_model', $query->{data_model} ) if $query->{data_model};

    $query->{failure} = 1;
    $query->{message} = "Failed to save configuration!";
    if ($conf->write($Trog::Config::home_cfg)) {
        $query->{failure} = 0;
        $query->{message} = "Configuration updated succesfully.";
    }
    #Get the PID of the parent port using lsof, send HUP
    my $parent = getppid;
    kill 'HUP', $parent;

    return config($query, $render_cb);
}

=head2 themeclone

Clone a theme by copying a directory.

=cut

sub themeclone ($query, $render_cb) {
    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};
    my ($theme, $newtheme) = ($query->{theme},$query->{newtheme});

    my $themedir = 'www/themes';

    $query->{failure} = 1;
    $query->{message} = "Failed to clone theme '$theme' as '$newtheme'!";
    require File::Copy::Recursive;
    if ($theme && $newtheme && File::Copy::Recursive::dircopy( "$themedir/$theme", "$themedir/$newtheme" )) {
        $query->{failure} = 0;
        $query->{message} = "Successfully cloned theme '$theme' as '$newtheme'.";
    }
    return config($query, $render_cb);
}

=head2 post_save

Saves posts submitted via the /post pages

=cut

sub post_save ($query, $render_cb) {

    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};
    my $to = delete $query->{to};

    #Copy this down since it will be deleted later
    my $acls = $query->{acls};

    state $data = Trog::Data->new($conf);
    $query->{tags}  = _coerce_array($query->{tags});

    # Filter bits and bobs
    delete $query->{primary_post};
    delete $query->{social_meta};
    delete $query->{deflate};
    delete $query->{acls};

    # Ensure there are no null tags
    @{$query->{tags}} = grep { defined $_ } @{$query->{tags}};

    $query->{failure} = $data->add($query);
    $query->{to} = $to;
    $query->{acls} = $acls;
    $query->{message} = $query->{failure} ? "Failed to add post!" : "Successfully added Post";
    delete $query->{id};
    return posts($query, $render_cb);
}

=head2 profile

Saves / updates new users.

=cut

sub profile ($query, $render_cb) {
    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};

    #TODO allow users to do something OTHER than be admins
    if ($query->{password}) {
        Trog::Auth::useradd($query->{username}, $query->{password}, ['admin'] );
    }

    #Make sure it is "self-authored", redact pw
    $query->{user} = delete $query->{username};
    delete $query->{password};

    return post_save($query, $render_cb);
}

=head2 post_delete

deletes posts.

=cut

sub post_delete ($query, $render_cb) {
    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};

    state $data = Trog::Data->new($conf);
    $query->{failure} = $data->delete($query);
    $query->{to} = $query->{to};
    $query->{message} = $query->{failure} ? "Failed to delete post $query->{id}!" : "Successfully deleted Post $query->{id}";
    delete $query->{id};
    return posts($query, $render_cb);
}

=head2 series

Series specific view, much like the users/ route
Displays identified series, not all series.

=cut

sub series ($query, $render_cb) {
    my $is_admin = grep { $_ eq 'admin' } @{$query->{acls}};

    #we are either viewed one of two ways, /post/$id or /$aclname
    my (undef,$aclname,$id) = split(/\//,$query->{route});
    $query->{aclname} = $aclname if !$id;
    $query->{id}      = $id      if $id;

    # Don't show topbar series on the series page.  That said, don't exclude it from direct series view.
    $query->{exclude_tags} = ['topbar'] if !$is_admin && $aclname && $aclname eq 'series';

    #XXX I'd prefer to overload id to actually *be* the aclname...
    # but this way, accomodates things like the flat file time-indexing hack.
    # TODO I should probably have it for all posts, and make *everything* a series.
    # WE can then do threaded comments/posts.
    # That will essentially necessitate it *becoming* the ID for real.

    #Grab the relevant tag (aclname), then pass that to posts
    my @posts = _post_helper($query, ['series'], $query->{acls});

    delete $query->{id};
    delete $query->{aclname};

    $query->{subhead} = $posts[0]->{data};
    $query->{title} = $posts[0]->{title};
    $query->{tag} = $posts[0]->{aclname};
    $query->{primary_post} = $posts[0];
    $query->{in_series} = 1;

    return posts($query,$render_cb);
}

=head2 avatars

Returns the avatars.css.  Limited to 1000 users.

=cut

sub avatars ($query, $render_cb) {
    #XXX if you have more than 1000 editors you should stop
    push(@{$query->{acls}}, 'public');
    my $tags = _coerce_array($query->{tag});
    my $processor = Text::Xslate->new(
        function => {
            css_escape => sub {
                my ( $str ) = @_;
                return '' if !$str;
                $str =~ s/([!"#$%&'()*+,.\/:;<=>?@\[\\\]^`{|}~-]+)/\\$1/g;
                return $str;
            },
        },
        path     => $template_dir,
    );

    my @posts = _post_helper($query, $tags, $query->{acls});

    my $content = $processor->render('avatars.tx', {
        users => \@posts,
    });

    return [200, ["Content-type" => "text/css" ],[$content]];
}

=head2 users

Implements direct user profile view.

=cut

sub users ($query, $render_cb) {
    # Capture the username
    my (undef, undef, $username) = split(/\//, $query->{route});

    $query->{username} //= $username;
    push(@{$query->{acls}}, 'public');
    $query->{exclude_tags} = ['about'];

    # Don't show topbar series on the series page.  That said, don't exclude it from direct series view.
    my $is_admin = grep { $_ eq 'admin' } @{$query->{acls}};
    push(@{$query->{exclude_tags}}, 'topbar') if !$is_admin;

    my @posts = _post_helper({ author => $query->{username} }, ['about'], $query->{acls});
    $query->{id}           = $posts[0]->{id};
    $query->{title}        = $posts[0]->{title};
    $query->{user_obj}     = $posts[0];
    $query->{primary_post} = $posts[0];
    $query->{in_series}    = 1;
    return posts($query,$render_cb);
}

=head2 posts

Display multi or single posts, supports RSS and pagination.

=cut

sub posts ($query, $render_cb, $direct=0) {
    #Process the input URI to capture tag/id
    $query->{route} //= $query->{to};
    my (undef, undef, $id) = split(/\//, $query->{route});

    my $tags = _coerce_array($query->{tag});
    $query->{id} = $id if $id && !$query->{in_series};

    my $is_admin = grep { $_ eq 'admin' } @{$query->{acls}};
    push(@{$query->{acls}}, 'public');
    push(@{$query->{acls}}, 'unlisted') if $query->{id};
    push(@{$query->{acls}}, 'private')  if $is_admin;
    my @posts;

    # Discover this user's visibility, so we can make them post in this category by default
    my $user_visibility = 'public';

    if ($query->{user_obj}) {
        #Optimize the /users/* route
        @posts = ($query->{user_obj});
        $user_visibility = $query->{user_obj}->{visibility};
    } else {
        if ($query->{user}) {
            my @me = _post_helper({ author => $query->{user} }, ['about'], $query->{acls});
            $user_visibility = $me[0]->{visibility};
        }
        @posts = _post_helper($query, $tags, $query->{acls});
    }

    if ($query->{id}) {
        $query->{primary_post} = $posts[0] if @posts;
    }

    #OK, so if we have a user as the ID we found, go grab the rest of their posts
    if ($query->{id} && @posts && grep { $_ eq 'about'} @{$posts[0]->{tags}} ) {
        my $user = shift(@posts);
        my $id = delete $query->{id};
        $query->{author} = $user->{user};
        @posts = _post_helper($query, $tags, $query->{acls});
        @posts = grep { $_->{id} ne $id } @posts;
        unshift @posts, $user;
    }

    if (!$is_admin) {
        return notfound($query, $render_cb) unless @posts;
    }

    my $fmt = $query->{format} || '';
    return _rss($query,\@posts) if $fmt eq 'rss';

    my $processor = Text::Xslate->new(
        path   => $template_dir,
        function => {
            render_it => sub {
                my ($template_string, $options) = @_;
                return Text::Xslate->new(
                    # Prevent a recursive descent.  If the renderer is hit again, just do nothing
                    # XXX unfortunately if the post tries to include itself, it will die.
                    function => {
                        embed => sub {
                            my ($this_id, $style) = @_;
                            $style //= 'embed';
                            # If instead the style is 'content', then we will only show the content w/ no formatting, and no title.
                            return Text::Xslate::mark_raw(Trog::Routes::HTML::posts(
                                { route => "/post/$this_id", style => $style },
                                sub {},
                            1));
                        },
                    },
                )->render_string($template_string,$options);
            },
        },
    );

    #XXX Is used by the sitemap, maybe just fix there?
    my @post_aliases = map { $_->{local_href} } _get_series();

    my ($header,$footer);
    my $t_processor;
    $t_processor = Text::Xslate->new(
        path =>  "www/$theme_dir/templates",
    ) if $theme_dir;

    $header = _pick_processor('templates/headers/'.$query->{primary_post}{header}, $processor,$t_processor)->render('headers/'.$query->{primary_post}{header}, { theme_dir => $td } ) if $query->{primary_post}{header};
    $footer = _pick_processor('templates/footers/'.$query->{primary_post}{footer}, $processor,$t_processor)->render('footers/'.$query->{primary_post}{footer}, { theme_dir => $td } ) if $query->{primary_post}{footer};

    # List the available headers/footers
    my $headers = _templates_in_dir($theme_dir ? "www/$theme_dir/templates/headers" : "www/templates/headers");
    my $footers = _templates_in_dir($theme_dir ? "www/$theme_dir/templates/footers" : "www/templates/footers");

    my $styles = _build_themed_styles('posts.css');

    #Correct page headers
    my $ph = $themed ? _themed_title($query->{route}) : $query->{route};

    # Build page title if it wasn't set by a wrapping sub
    $query->{title} = "$query->{domain} : $query->{title}" if $query->{title} && $query->{domain};
    $query->{title} ||= @$tags && $query->{domain} ? "$query->{domain} : @$tags" : undef;

    #Handle paginator vars
    my $limit = int($query->{limit} || 25);
    my $now_year = (localtime(time))[5] + 1900;
    my $oldest_year = $now_year - 20; #XXX actually find oldest post year

    # Handle post style.
    if ($query->{style}) {
        undef $header;
        undef $footer;
    }

    my $older = !@posts ? 0 : $posts[-1]->{created};
    $query->{failure} //= -1;
    $query->{id} //= '';

    #XXX messed up data has to be fixed unfortunately
    @$tags = List::Util::uniq @$tags;

    #Filter displaying visibility tags
    my @visibuddies = qw{public unlisted private};
    foreach my $post (@posts) {
        @{$post->{tags}} = grep { my $tag = $_; !grep { $tag eq $_ } @visibuddies } @{$post->{tags}};
    }

    #XXX note that we are explicitly relying on the first tag to be the ACL
    my $aclselected = $tags->[0] || '';
    my @acls  = map {
        $_->{selected} = $_->{aclname} eq $aclselected ? 'selected' : '';
        $_
    } _post_helper({}, ['series'], $query->{acls});

    my $forms = _templates_in_dir("$template_dir/forms");

    my $edittype = $query->{primary_post} ? $query->{primary_post}->{child_form} : $query->{form};
    my $tiled    = $query->{primary_post} ? !$is_admin && $query->{primary_post}->{tiled} : 0;

    # Grab the rest of the tags to dump into the edit form
    state $data = Trog::Data->new($conf);
    my @tags_all = $data->tags();
    #Filter out the visibilities and special series tags
    @tags_all = grep { my $subj = $_; scalar(grep { $_ eq $subj } qw{public private unlisted admin series about topbar}) == 0 } @tags_all;

    @posts = map {
        my $subject = $_;
        my @et = grep { my $subj = $_; grep { $subj eq $_ } @tags_all } @{$subject->{tags}};
        @et = grep { $_ ne $aclselected } @et;
        $_->{extra_tags} = \@et;
        $_
    } @posts;
    my @et = List::MoreUtils::singleton(@$tags, @tags_all);

    my $content = $processor->render('posts.tx', {
        acls      => \@acls,
        can_edit  => $is_admin,
        forms     => $forms,
        post      => { tags => $tags, extra_tags => \@et, form => $edittype, visibility => $user_visibility, addpost => 1 },
        post_visibilities => \@visibuddies,
        failure   => $query->{failure},
        to        => $query->{to},
        message   => $query->{failure} ? "Failed to add post!" : "Successfully added Post as $query->{id}",
        direct    => $direct,
        title     => $query->{title},
        style     => $query->{style},
        posts     => \@posts,
        like      => $query->{like},
        in_series => exists $query->{in_series} || !!($query->{route} =~ m/^\/series\//),
        route     => $query->{route},
        limit     => $limit,
        pages     => scalar(@posts) == $limit,
        older     => $older,
        sizes     => [25,50,100],
        rss       => !$query->{id} && !$query->{older},
        tiled     => $tiled,
        category  => $ph,
        subhead   => $query->{subhead},
        header    => $header,
        footer    => $footer,
        headers   => $headers,
        footers   => $footers,
        years     => [reverse($oldest_year..$now_year)],
        months    => [0..11],
    });
    return $content if $direct;
    return Trog::Routes::HTML::index($query, $render_cb, $content, $styles);
}

sub _templates_in_dir($path) {
    my $forms = [];
    opendir(my $dh, $path);
    while (my $form = readdir($dh)) {
        push(@$forms, $form) if -f "$path/$form" && $form =~ m/.*\.tx$/;
    }
    close($dh);
    return $forms;
}

sub _themed_title ($path) {
    return $path unless %Theme::paths;
    return $Theme::paths{$path} ? $Theme::paths{$path} : $path;
}

sub _post_helper ($query, $tags, $acls) {
    state $data = Trog::Data->new($conf);
    return $data->get(
        older   => $query->{older},
        page    => int($query->{page} || 1),
        limit   => int($query->{limit} || 25),
        tags    => $tags,
        exclude_tags => $query->{exclude_tags},
        acls    => $acls,
        aclname => $query->{aclname},
        like    => $query->{like},
        author  => $query->{author},
        id      => $query->{id},
        version => $query->{version},
    );
}

=head2 sitemap

Return the sitemap index unless the static or a set of dynamic routes is requested.
We have a maximum of 99,990,000 posts we can make under this model
As we have 10,000 * 10,000 posts which are indexable via the sitemap format.
1 top level index slot (10k posts) is taken by our static routes, the rest will be /posts.

Passing ?xml=1 will result in an appropriate sitemap.xml instead.
This is used to generate the static sitemaps as expected by search engines.

Passing compressed=1 will gzip the output.

=cut

sub sitemap ($query, $render_cb) {

    my (@to_map, $is_index, $route_type);
    my $warning = '';
    $query->{map} //= '';
    if ($query->{map} eq 'static') {
        # Return the map of static routes
        $route_type = 'Static Routes';
        @to_map = grep { !defined $routes{$_}->{captures} && $_ !~ m/^default|login|auth$/ && !$routes{$_}->{auth} } keys(%routes);
    } elsif ( !$query->{map} ) {
        # Return the index instead
        @to_map = ('static');
        my $data = Trog::Data->new($conf);
        my $tot = $data->count();
        my $size = 50000;
        my $pages = int($tot / $size) + (($tot % $size) ? 1 : 0);

        # Truncate pages at 10k due to standard
        my $clamped = $pages > 49999 ? 49999 : $pages;
        $warning = "More posts than possible to represent in sitemaps & index!  Old posts have been truncated." if $pages > 49999;

        foreach my $page ($clamped..1) {
            push(@to_map, "$page");
        }
        $is_index = 1;
    } else {
        $route_type = "Posts: Page $query->{map}";
        # Return the map of the particular range of dynamic posts
        $query->{limit} = 50000;
        $query->{page} = $query->{map};
        @to_map = _post_helper($query, [], ['public']);
    }

    if ( $query->{xml} ) {
        my $sm;
        my $xml_date = time();
        my $fmt = "xml";
        $fmt .= ".gz" if $query->{compressed};
        if ( !$query->{map}) {
            require WWW::SitemapIndex::XML;
            $sm = WWW::SitemapIndex::XML->new();
            foreach my $url (@to_map) {
                $sm->add(
                    loc     => "http://$query->{domain}/sitemap/$url.$fmt",
                    lastmod => $xml_date,
                );
            }
        } else {
            require WWW::Sitemap::XML;
            $sm = WWW::Sitemap::XML->new();
            my $changefreq = $query->{map} eq 'static' ? 'monthly' : 'daily';
            foreach my $url (@to_map) {
                my $true_uri = "http://$query->{domain}$url";
                if (ref $url eq 'HASH') {
                    my $is_user_page = grep { $_ eq 'about' } @{$url->{tags}};
                    $true_uri = "http://$query->{domain}/posts/$url->{id}";
                    $true_uri = "http://$query->{domain}/users/$url->{title}" if $is_user_page;
                }
                my %data = (
                    loc        => $true_uri,
                    lastmod    => $xml_date,
                    mobile     => 1,
                    changefreq => $changefreq,
                    priority   => 1.0,
                );

                if (ref $url eq 'HASH') {
                    #add video & preview image if applicable
                    $data{images} = [{
                        loc => "http://$query->{domain}$url->{href}",
                        caption => $url->{data},
                        title => substr($url->{title},0,100),
                    }] if $url->{is_image};

                    # Truncate descriptions
                    my $desc = substr($url->{data},0,2048);
                    $desc //= '';
                    $data{videos} = [{
                        content_loc   => "http://$query->{domain}$url->{href}",
                        thumbnail_loc => "http://$query->{domain}$url->{preview}",
                        title         => substr($url->{title},0,100),
                        description   => $desc,
                    }] if $url->{is_video};
                }

                $sm->add(%data);
            }
        }
        my $xml = $sm->as_xml();
        require IO::String;
        my $buf = IO::String->new();
        my $ct = 'application/xml';
        $xml->toFH($buf, 0);
        seek $buf, 0, 0;

        if ($query->{compressed}) {
            require IO::Compress::Gzip;
            my $compressed = IO::String->new();
            IO::Compress::Gzip::gzip($buf => $compressed);
            $ct = 'application/gzip';
            $buf = $compressed;
            seek $compressed, 0, 0;
        }
        return [200,["Content-type" => $ct], $buf];
    }

    @to_map = sort @to_map unless $is_index;
    my $processor = Text::Xslate->new(
        path   => _dir_for_resource('sitemap.tx'),
    );

    my $styles = _build_themed_styles('sitemap.css');

    $query->{title} = "$query->{domain} : Sitemap";
    my $content = $processor->render('sitemap.tx', {
        title      => "Site Map",
        to_map     => \@to_map,
        is_index   => $is_index,
        route_type => $route_type,
        route      => $query->{route},
    });

    return Trog::Routes::HTML::index($query, $render_cb,$content,$styles);
}

sub _rss ($query,$posts) {
    require XML::RSS;
    my $rss = XML::RSS->new (version => '2.0');
    my $now = DateTime->from_epoch(epoch => time());
    $rss->channel(
        title          => "$query->{domain}",
        link           => "http://$query->{domain}/$query->{route}?format=rss",
        language       => 'en', #TODO localization
        description    => "$query->{domain} : $query->{route}",
        pubDate        => $now,
        lastBuildDate  => $now,
    );

    #TODO configurability
    $rss->image(
        title       => $query->{domain},
        url         => "$td/img/icon/favicon.ico",
        link        => "http://$query->{domain}",
        width       => 88,
        height      => 31,
        description => "$query->{domain} favicon",
    );

    foreach my $post (@$posts) {
        my $url = "http://$query->{domain}$post->{local_href}";
        _post2rss($rss,$url,$post);
        next unless ref $post->{aliases} eq 'ARRAY';
        foreach my $alias (@{$post->{aliases}}) {
            $url = "http://$query->{domain}$alias";
            _post2rss($rss,$url,$post);
        }
    }

    require Encode;
    return [200, ["Content-type" => "application/rss+xml"], [Encode::encode_utf8($rss->as_string)]];
}

sub _post2rss ($rss,$url,$post) {
    $rss->add_item(
        title       => $post->{title},
        permaLink   => $url,
        link        => $url,
        enclosure   => { url => $url, type=>"text/html" },
        description => "<![CDATA[$post->{data}]]>",
        pubDate     => DateTime->from_epoch(epoch => $post->{created} ), #TODO format like Thu, 23 Aug 1999 07:00:00 GMT
        author      => $post->{user}, #TODO translate to "email (user)" format
    );
}

=head2 manual

Implements the /manual and /lib/* routes.

Basically a thin wrapper around Pod::Html.

=cut

sub manual ($query, $render_cb) {
    require Pod::Html;
    require Capture::Tiny;

    return forbidden($query, $render_cb) unless grep { $_ eq 'admin' } @{$query->{acls}};

    #Fix links from Pod::HTML
    $query->{module} =~ s/\.html$//g if $query->{module};

    my $infile = $query->{module} ? "$query->{module}.pm" : 'tCMS/Manual.pod';
    return notfound($query,$render_cb) unless -f "lib/$infile";
    my $content = capture { Pod::Html::pod2html(qw{--podpath=lib --podroot=.},"--infile=lib/$infile") };

    my @series = _get_series(1);

    return $render_cb->('manual.tx', {
        title       => 'tCMS Manual',
        theme_dir   => $td,
        content     => $content,
        categories  => \@series,
        stylesheets => _build_themed_styles('post.css'),
    });
}

# Deal with Params which may or may not be arrays
sub _coerce_array ($param) {
    my $p = $param || [];
    $p = [$param] if $param && (ref $param ne 'ARRAY');
    return $p;
}

sub _build_themed_styles ($style) {
    my @styles;
    @styles = ("/styles/$style") if -f "www/styles/$style";
    my $ts = _themed_style($style);
    push(@styles, $ts) if $theme_dir && -f "www/$ts";
    return \@styles;
}

sub _build_themed_scripts ($script) {
    my @scripts = ("/scripts/$script");
    my $ts = _themed_script($script);
    push(@scripts, $ts) if $theme_dir && -f "www/$ts";
    return \@scripts;
}

sub _build_themed_templates ($template) {
    my @templates = ("/templates/$template");
    my $ts = _themed_template($template);
    push(@templates, $ts) if $theme_dir && -f "www/$ts";
    return \@templates;
}

sub _pick_processor($file, $normal, $themed) {
    return _dir_for_resource($file) eq $template_dir ? $normal : $themed;
}

# Pick appropriate dir based on whether theme override exists
sub _dir_for_resource ($resource) {
    return $theme_dir && -f "www/$theme_dir/$resource" ? $theme_dir : $template_dir;
}

sub _themed_style ($resource) {
    return _dir_for_resource("styles/$resource")."/styles/$resource";
}

sub _themed_script ($resource) {
    return _dir_for_resource("scripts/$resource")."/scripts/$resource";
}

sub _themed_template ($resource) {
    return _dir_for_resource("templates/$resource")."/templates/$resource";
}

1;