#!/usr/bin/env perl

use Mojolicious::Lite;
use Data::Dump qw(dump);
use Time::HiRes;
use Clone qw(clone);
use Mojo::UserAgent;

our $VERSION = `git describe`;
chomp $VERSION;

sub new_uuid { Time::HiRes::time * 100000 }

#push @{app->static->paths}, 'app'; # default angular-seed app directory


my $couchdb = $ENV{COUCHDB} || 'http://localhost:5984';
my $couchdb_database = 'drzb2013v2';
my $couchdb_view = "http://10.60.0.92:5984/_utils/document.html?$couchdb_database";
my $client = Mojo::UserAgent->new;

sub _couchdb_put {
	my ( $url, $data ) = @_;

	$data->{'$entity'} = $1 if $url =~ m{/(\w+)\.\d+/$/};

	my $json = Mojo::JSON->new->encode( $data );

	my $rev;

	warn "# _couchdb_put $url = $json";
	return $client->put( "$couchdb/$url" => $json)->res->json;
}

sub _couchdb_get {
	my ( $url ) = @_;
	my $return = $client->get( "$couchdb/$url" )->res->json;
#	warn "# _couchdb_get $url = ",dump($return);
	return $return;
}


our $id2nr;


sub _render_jsonp {
	my ( $self, $json ) = @_;
#warn "## _render_json ",dump($json);
	my $data = $self->render( json => $json, partial => 1 );
#warn "## _render_json $data";
	if ( my $callback = $self->param('callback') ) {
		$data = "$callback($data)";
	}
	$self->render( data => $data, format => 'js' );
}

get '/' => sub {
	my $self = shift;
	$self->render_text("...");
};

# define languages

helper locale => sub {
	my $self = shift;
	my %locale = @_;
	my $lang = $self->stash('lang');
	$lang =~ s/-dev$//;
	return $locale{ $lang } || "MISSING $lang $_[1]";
};

helper ip => sub {
	my $self = shift;
	return
		$self->req->headers->header('X-Forwarded-For')
		|| $self->req->headers->header('X-Real-IP')
		|| $self->tx->{remote_address}
	;
};


get '/js/services.js' => sub {
	my $self = shift;
	$self->stash( VERSION => $VERSION );
	$self->stash( couchdb_database => $couchdb_database );
	$self->render( 'js/services', format => 'js' );
};

# short public URLs
get '/hr' => sub { shift->redirect_to('/lang/hr/drzb2013') };
get '/en' => sub { shift->redirect_to('/lang/en/drzb2013') };

get '/lang/:lang/:template' => sub {
	my $self = shift;
	$self->render( $self->stash('template') , lang => $self->stash('lang') );
};

get '/lang/:lang/partials/:template' => sub {
	my $self = shift;
	$self->stash( couchdb_view => $couchdb_view );
	$self->render( 'partials/' . $self->stash('template') , lang => $self->stash('lang') );
};

get '/lang/:lang/.template' => sub {
	my $self = shift;
	$self->render( $self->stash('template') , lang => $self->stash('lang') );
};

get '/lang/:lang/template/*template' => sub { # angular-ui templates
	my $self = shift;
	my $path = '/lib/angular-ui/bootstrap/template/' . $self->stash('template');
	warn "# render_static $path";
	$self->render_static( $path );
};

get '/data/' => sub {
	my $self = shift;
	_render_jsonp( $self, _couchdb_get('/_all_dbs') );
};

get '/data/:database' => sub {
	my $self = shift;
	my $database = $self->param('database');

	my $list_databases = { name => $database };

	my $counts = _couchdb_get("/$database/_design/entity/_view/counts?group=true");
	if ( exists $counts->{error} ) {
		warn "creating CouchDB view because of ", dump($counts);
		_couchdb_put "/$database/_design/entity", {
			_id => '_design/entity',
			language => 'javascript',
			views => {
				counts => {
					map    => q| function(doc) { emit(doc._id.split('.')[0],1); } |,
					reduce => q| function(keys,values,rereduce) { return sum(values); } |,
				}
			}
		};
		$counts = _couchdb_get("/$database/_design/entity/_view/counts?group=true")
		|| die "give up!";
	}

	warn "# counts ",dump($counts);

	foreach my $row ( @{ $counts->{rows} } ) {
		my $n = $row->{value};
		$list_databases->{entities}->{ $row->{key} } = $n;
		$list_databases->{document_counts} += $n;
	}
	warn dump($list_databases);
	_render_jsonp( $self,  $list_databases );
};

get '/data/:database/:entity' => sub {
	my $self = shift;

	my $database = $self->param('database');
	my $entity   = $self->param('entity');

	my $endkey = $entity;
	$endkey++;

	my $counts = _couchdb_get qq|/$database/_all_docs?startkey="$entity";endkey="$endkey";include_docs=true|;
#	warn "# counts ",dump($counts);

	_render_jsonp( $self, [ map { $_->{doc} } @{ $counts->{rows} } ] )
};

get '/data/:database/:entity/:id' => sub {
    my $self = shift;

	my $database = $self->param('database');
	my $entity   = $self->param('entity');
	my $id       = $self->param('id');

	_render_jsonp( $self, _couchdb_get( "/$database/$entity.$id" ) );
};

any [ 'post' ] => '/data/:database/:entity' => sub {
	my $self = shift;
	my $database = $self->param('database');
	my $entity   = $self->param('entity');
	my $json = $self->req->json;
	my $id;
	if ( exists $json->{'id'} ) { # @id in resource
		$id = $json->{'id'};
		warn "EXISTING $id\n";
	} else {
		$id = $json->{'id'} = new_uuid;
		$json->{entity} = $entity;
		warn "NEW $id\n";
	}

	$json->{x_audit} = {
		t  => Time::HiRes::time,
		ip => $self->ip(),
	};

	warn "## $database $entity $id body ",dump($self->req->body, $json);

	my $new = _couchdb_put "/$database/$entity.$id" => $json;
	warn "new: ",dump($new);
	if ( $new->{ok} ) {
		$json->{'_'.$_} = $new->{$_} foreach ( 'rev','id' );
	} else {
		warn "ERROR: ",dump($new);
		$json->{error} = $new;
	}

	_render_jsonp( $self,  $json );
};


#get '/' => sub { shift->redirect_to('/app/') };

# CouchDB proxy for _design _view

our $view_cache;

get '/:database/_design/:design/_view/:view' => sub {
	my $self = shift;
	my $format = $self->param('format');
	my $url = join('/', $self->param('database'),'_design',$self->param('design'),'_view',$self->param('view') );
	if ( my $param = $self->req->url->query->clone->remove('callback')->remove('format')->to_string ) {
		$url .= '?' . $param
	}

	if ( exists $view_cache->{$url}->{time} ) {
		if ( time() - $view_cache->{$url}->{time} < 60 ) {
			warn "HIT CouchDB cache $url";
			$view_cache->{$url}->{hit}++;
			return _render_jsonp( $self, $view_cache->{$url}->{json} );
		} else {
			warn "REFRESH CouchDB cache $url";
			$view_cache->{$url}->{refresh}++;
		}
	} else {
		$view_cache->{$url}->{miss}++;
	}
	warn "CouchDB proxy $url";
	my $json = _couchdb_get($url);

	if ( exists $json->{error} ) {
		warn "creating CouchDB view because of ", dump($json);
		my $url = "/" . $self->param('database') . "/_design/registration";
		_couchdb_put $url, {
			_id => '_design/registration',
			language => 'javascript',
			views => {
				organizations => {
					map    => q| function(doc) {
if ( doc.user.organization != '' ) {
  if ( doc.user.organization )
    emit(doc.user.organization, 1);
  if ( doc.user.persons ) {
    doc.user.persons.forEach( function(person) {
      if ( person.organization )
        emit(person.organization, 1);
    });
  }
}
					}q|,
					reduce => q| function(keys,values,rereduce) { return sum(values); } |,
				}
			}
		};
		$json = _couchdb_get($url)
		|| die "give up!";
	}

	if ( $format eq 'key_array' ) { # array of keys sorted by value
		$json->{rows} = [ map { $_->{key} } sort { $b->{value} <=> $a->{value} } @{ $json->{rows} } ];
	}

	$view_cache->{$url}->{time} = time();
	$view_cache->{$url}->{json} = $json;

	warn "# view_cache ",dump($view_cache);

	_render_jsonp( $self, $json );
};

# http://showmetheco.de/articles/2010/10/adding-etag-caching-to-your-mojolicious-app.html

hook after_dispatch => sub {
	my $self = shift;

	return unless $self->req->method eq 'GET';

	my $body = $self->res->body;
	return unless defined $body;

	return if $self->res->headers->header('ETag');

	my $our_etag = Mojo::ByteStream->new($body . $VERSION)->md5_sum;
	$self->res->headers->header('ETag' => $our_etag);

	my $browser_etag = $self->req->headers->header('If-None-Match');
	return unless $browser_etag && $browser_etag eq $our_etag;

	$self->app->log->debug("HTTP cache hit " . $self->req->url->to_string . " $our_etag" );

	$self->res->code(304);
	$self->res->body('');
};


app->start;

