From f3e2d7f1637629f9c4c2224feb0da2735c022a72 Mon Sep 17 00:00:00 2001
From: lukasmartinelli <me@lukasmartinelli.ch>
Date: Fri, 28 Oct 2016 18:01:31 +0200
Subject: [PATCH] Add gridrank attribute

---
 layers/poi/class.sql | 30 ++++++++++++++++++++++++++++++
 layers/poi/layer.sql | 13 +++++++++----
 layers/poi/poi.yaml  |  2 +-
 3 files changed, 40 insertions(+), 5 deletions(-)

diff --git a/layers/poi/class.sql b/layers/poi/class.sql
index 7a915dab..d4f0795e 100644
--- a/layers/poi/class.sql
+++ b/layers/poi/class.sql
@@ -1,3 +1,33 @@
+CREATE OR REPLACE FUNCTION poi_class_rank(class TEXT)
+RETURNS INT AS $$
+    SELECT CASE class
+        WHEN 'hospital' THEN 20
+        WHEN 'park' THEN 25
+        WHEN 'cemetery' THEN 30
+        WHEN 'bus' THEN 50
+        WHEN 'attraction' THEN 70
+        WHEN 'harbor' THEN 75
+        WHEN 'college' THEN 80
+        WHEN 'school' THEN 85
+        WHEN 'stadium' THEN 90
+        WHEN 'zoo' THEN 95
+        WHEN 'town_hall' THEN 100
+        WHEN 'campsite' THEN 110
+        WHEN 'cemetery' THEN 115
+        WHEN 'park' THEN 120
+        WHEN 'library' THEN 130
+        WHEN 'police' THEN 135
+        WHEN 'post' THEN 140
+        WHEN 'golf' THEN 150
+        WHEN 'shop' THEN 400
+        WHEN 'grocery' THEN 500
+        WHEN 'fast_food' THEN 600
+        WHEN 'clothing_store' THEN 700
+        WHEN 'bar' THEN 800
+        ELSE 1000
+    END;
+$$ LANGUAGE SQL IMMUTABLE;
+
 CREATE OR REPLACE FUNCTION poi_class(subclass TEXT)
 RETURNS TEXT AS $$
     SELECT CASE
diff --git a/layers/poi/layer.sql b/layers/poi/layer.sql
index 33ac661f..421e7761 100644
--- a/layers/poi/layer.sql
+++ b/layers/poi/layer.sql
@@ -1,8 +1,13 @@
-CREATE OR REPLACE FUNCTION layer_poi(bbox geometry, zoom_level integer)
-RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, class text, subclass text) AS $$
-    SELECT id, geometry, name, NULLIF(name_en, ''), poi_class(subclass) AS class, subclass
+CREATE OR REPLACE FUNCTION layer_poi(bbox geometry, zoom_level integer, pixel_width numeric)
+RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, class text, subclass text, gridrank bigint) AS $$
+    SELECT id, geometry, name, NULLIF(name_en, ''), poi_class(subclass) AS class, subclass,
+        row_number() OVER (
+            PARTITION BY LabelGrid(geometry, 100 * pixel_width)
+            ORDER BY poi_class_rank(poi_class(subclass)) ASC, length(name) DESC
+        ) AS gridrank
     FROM osm_poi_point
     WHERE geometry && bbox
+      AND zoom_level >= 14
       AND name <> ''
-      AND (zoom_level >= 14);
+    ORDER BY gridrank;
 $$ LANGUAGE SQL IMMUTABLE;
diff --git a/layers/poi/poi.yaml b/layers/poi/poi.yaml
index fa996ea1..aab9e50b 100644
--- a/layers/poi/poi.yaml
+++ b/layers/poi/poi.yaml
@@ -9,7 +9,7 @@ layer:
   datasource:
     geometry_field: geometry
     srid: 900913
-    query: (SELECT geometry, name, name_en, class, subclass FROM layer_poi(!bbox!, z(!scale_denominator!))) AS t
+    query: (SELECT geometry, name, name_en, class, subclass, gridrank FROM layer_poi(!bbox!, z(!scale_denominator!), !pixel_width!)) AS t
 schema:
   - ./class.sql
   - ./layer.sql