-- etldoc: layer_place[shape=record fillcolor=lightpink, style="rounded,filled",
-- etldoc:     label="layer_place | <z0_3> z0-3|<z4_7> z4-7|<z8_11> z8-11| <z12_14> z12-z14+" ] ;

CREATE OR REPLACE FUNCTION layer_place(bbox geometry, zoom_level int, pixel_width numeric)
    RETURNS TABLE
            (
                osm_id   bigint,
                geometry geometry,
                name     text,
                name_en  text,
                name_de  text,
                tags     hstore,
                class    text,
                "rank"   int,
                capital  int,
                iso_a2   text
            )
AS
$$
SELECT *
FROM (
         SELECT
             -- etldoc: osm_continent_point -> layer_place:z0_3
             osm_id * 10                                  AS osm_id,
             geometry,
             name,
             COALESCE(NULLIF(name_en, ''), name)          AS name_en,
             COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
             tags,
             'continent'                                  AS class,
             1                                            AS "rank",
             NULL::int                                    AS capital,
             NULL::text                                   AS iso_a2
         FROM osm_continent_point
         WHERE geometry && bbox
           AND zoom_level < 4

         UNION ALL

         SELECT
             -- etldoc: osm_country_point -> layer_place:z0_3
             -- etldoc: osm_country_point -> layer_place:z4_7
             -- etldoc: osm_country_point -> layer_place:z8_11
             -- etldoc: osm_country_point -> layer_place:z12_14
             osm_id * 10                                  AS osm_id,
             geometry,
             name,
             COALESCE(NULLIF(name_en, ''), name)          AS name_en,
             COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
             tags,
             'country'                                    AS class,
             "rank",
             NULL::int                                    AS capital,
             iso3166_1_alpha_2                            AS iso_a2
         FROM osm_country_point
         WHERE geometry && bbox
           AND "rank" <= zoom_level + 1
           AND name <> ''

         UNION ALL

         SELECT
             -- etldoc: osm_state_point  -> layer_place:z0_3
             -- etldoc: osm_state_point  -> layer_place:z4_7
             -- etldoc: osm_state_point  -> layer_place:z8_11
             -- etldoc: osm_state_point  -> layer_place:z12_14
             osm_id * 10                                  AS osm_id,
             geometry,
             name,
             COALESCE(NULLIF(name_en, ''), name)          AS name_en,
             COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
             tags,
             'state'                                      AS class,
             "rank",
             NULL::int                                    AS capital,
             NULL::text                                   AS iso_a2
         FROM osm_state_point
         WHERE geometry && bbox
           AND name <> ''
           AND ("rank" + 2 <= zoom_level)
           AND (
                 zoom_level >= 5 OR
                 is_in_country IN ('United Kingdom', 'USA', 'Россия', 'Brasil', 'China', 'India') OR
                 is_in_country_code IN ('AU', 'CN', 'IN', 'BR', 'US'))

         UNION ALL

         SELECT
             -- etldoc: osm_island_point    -> layer_place:z12_14
             osm_id * 10                                  AS osm_id,
             geometry,
             name,
             COALESCE(NULLIF(name_en, ''), name)          AS name_en,
             COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
             tags,
             'island'                                     AS class,
             7                                            AS "rank",
             NULL::int                                    AS capital,
             NULL::text                                   AS iso_a2
         FROM osm_island_point
         WHERE zoom_level >= 12
           AND geometry && bbox

         UNION ALL

         SELECT
             -- etldoc: osm_island_polygon  -> layer_place:z8_11
             -- etldoc: osm_island_polygon  -> layer_place:z12_14
             osm_id * 10                                  AS osm_id,
             geometry,
             name,
             COALESCE(NULLIF(name_en, ''), name)          AS name_en,
             COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
             tags,
             'island'                                     AS class,
             island_rank(area)                            AS "rank",
             NULL::int                                    AS capital,
             NULL::text                                   AS iso_a2
         FROM osm_island_polygon
         WHERE geometry && bbox
           AND ((zoom_level = 8 AND island_rank(area) <= 3)
             OR (zoom_level = 9 AND island_rank(area) <= 4)
             OR (zoom_level >= 10))

         UNION ALL

         SELECT
             -- etldoc: layer_city          -> layer_place:z0_3
             -- etldoc: layer_city          -> layer_place:z4_7
             -- etldoc: layer_city          -> layer_place:z8_11
             -- etldoc: layer_city          -> layer_place:z12_14
             osm_id * 10 AS osm_id,
             geometry,
             name,
             name_en,
             name_de,
             tags,
             place::text AS class,
             "rank",
             capital,
             NULL::text  AS iso_a2
         FROM layer_city(bbox, zoom_level, pixel_width)
         ORDER BY "rank" ASC
     ) AS place_all
$$ LANGUAGE SQL STABLE
                PARALLEL SAFE;
-- TODO: Check if the above can be made STRICT -- i.e. if pixel_width could be NULL