-- Assorted helper functions for the triggers.

CREATE OR REPLACE FUNCTION geometry_sector(partition INTEGER, place geometry)
  RETURNS INTEGER
  AS $$
DECLARE
  NEWgeometry geometry;
BEGIN
--  RAISE WARNING '%',place;
  NEWgeometry := ST_PointOnSurface(place);
  RETURN (partition*1000000) + (500-ST_X(NEWgeometry)::integer)*1000 + (500-ST_Y(NEWgeometry)::integer);
END;
$$
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACE FUNCTION array_merge(a INTEGER[], b INTEGER[])
  RETURNS INTEGER[]
  AS $$
DECLARE
  i INTEGER;
  r INTEGER[];
BEGIN
  IF array_upper(a, 1) IS NULL THEN
    RETURN b;
  END IF;
  IF array_upper(b, 1) IS NULL THEN
    RETURN a;
  END IF;
  r := a;
  FOR i IN 1..array_upper(b, 1) LOOP  
    IF NOT (ARRAY[b[i]] <@ r) THEN
      r := r || b[i];
    END IF;
  END LOOP;
  RETURN r;
END;
$$
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACE FUNCTION reverse_place_diameter(rank_search SMALLINT)
  RETURNS FLOAT
  AS $$
BEGIN
  IF rank_search <= 4 THEN
    RETURN 5.0;
  ELSIF rank_search <= 8 THEN
    RETURN 1.8;
  ELSIF rank_search <= 12 THEN
    RETURN 0.6;
  ELSIF rank_search <= 17 THEN
    RETURN 0.16;
  ELSIF rank_search <= 18 THEN
    RETURN 0.08;
  ELSIF rank_search <= 19 THEN
    RETURN 0.04;
  END IF;

  RETURN 0.02;
END;
$$
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACE FUNCTION get_postcode_rank(country_code VARCHAR(2), postcode TEXT,
                                             OUT rank_search SMALLINT,
                                             OUT rank_address SMALLINT)
AS $$
DECLARE
  part TEXT;
BEGIN
    rank_search := 30;
    rank_address := 30;
    postcode := upper(postcode);

    IF country_code = 'gb' THEN
        IF postcode ~ '^([A-Z][A-Z]?[0-9][0-9A-Z]? [0-9][A-Z][A-Z])$' THEN
            rank_search := 25;
            rank_address := 5;
        ELSEIF postcode ~ '^([A-Z][A-Z]?[0-9][0-9A-Z]? [0-9])$' THEN
            rank_search := 23;
            rank_address := 5;
        ELSEIF postcode ~ '^([A-Z][A-Z]?[0-9][0-9A-Z])$' THEN
            rank_search := 21;
            rank_address := 5;
        END IF;

    ELSEIF country_code = 'sg' THEN
        IF postcode ~ '^([0-9]{6})$' THEN
            rank_search := 25;
            rank_address := 11;
        END IF;

    ELSEIF country_code = 'de' THEN
        IF postcode ~ '^([0-9]{5})$' THEN
            rank_search := 21;
            rank_address := 11;
        END IF;

    ELSE
        -- Guess at the postcode format and coverage (!)
        IF postcode ~ '^[A-Z0-9]{1,5}$' THEN -- Probably too short to be very local
            rank_search := 21;
            rank_address := 11;
        ELSE
            -- Does it look splitable into and area and local code?
            part := substring(postcode from '^([- :A-Z0-9]+)([- :][A-Z0-9]+)$');

            IF part IS NOT NULL THEN
                rank_search := 25;
                rank_address := 11;
            ELSEIF postcode ~ '^[- :A-Z0-9]{6,}$' THEN
                rank_search := 21;
                rank_address := 11;
            END IF;
        END IF;
    END IF;

END;
$$
LANGUAGE plpgsql IMMUTABLE;


-- Find the nearest artificial postcode for the given geometry.
-- TODO For areas there should not be more than two inside the geometry.
CREATE OR REPLACE FUNCTION get_nearest_postcode(country VARCHAR(2), geom GEOMETRY)
  RETURNS TEXT
  AS $$
DECLARE
  outcode TEXT;
  cnt INTEGER;
BEGIN
    -- If the geometry is an area then only one postcode must be within
    -- that area, otherwise consider the area as not having a postcode.
    IF ST_GeometryType(geom) in ('ST_Polygon','ST_MultiPolygon') THEN
        SELECT min(postcode), count(*) FROM
              (SELECT postcode FROM location_postcode
                WHERE ST_Contains(geom, location_postcode.geometry) LIMIT 2) sub
          INTO outcode, cnt;

        IF cnt = 1 THEN
            RETURN outcode;
        ELSE
            RETURN null;
        END IF;
    END IF;

    SELECT postcode FROM location_postcode
     WHERE ST_DWithin(geom, location_postcode.geometry, 0.05)
          AND location_postcode.country_code = country
     ORDER BY ST_Distance(geom, location_postcode.geometry) LIMIT 1
    INTO outcode;

    RETURN outcode;
END;
$$
LANGUAGE plpgsql STABLE;


CREATE OR REPLACE FUNCTION get_country_code(place geometry)
  RETURNS TEXT
  AS $$
DECLARE
  place_centre GEOMETRY;
  nearcountry RECORD;
BEGIN
  place_centre := ST_PointOnSurface(place);

-- RAISE WARNING 'get_country_code, start: %', ST_AsText(place_centre);

  -- Try for a OSM polygon
  FOR nearcountry IN
    SELECT country_code from location_area_country
    WHERE country_code is not null and st_covers(geometry, place_centre) limit 1
  LOOP
    RETURN nearcountry.country_code;
  END LOOP;

-- RAISE WARNING 'osm fallback: %', ST_AsText(place_centre);

  -- Try for OSM fallback data
  -- The order is to deal with places like HongKong that are 'states' within another polygon
  FOR nearcountry IN
    SELECT country_code from country_osm_grid
    WHERE st_covers(geometry, place_centre) order by area asc limit 1
  LOOP
    RETURN nearcountry.country_code;
  END LOOP;

-- RAISE WARNING 'near osm fallback: %', ST_AsText(place_centre);

  -- 
  FOR nearcountry IN
    SELECT country_code from country_osm_grid
    WHERE st_dwithin(geometry, place_centre, 0.5)
    ORDER BY st_distance(geometry, place_centre) asc, area asc limit 1
  LOOP
    RETURN nearcountry.country_code;
  END LOOP;

  RETURN NULL;
END;
$$
LANGUAGE plpgsql STABLE;


CREATE OR REPLACE FUNCTION get_country_language_code(search_country_code VARCHAR(2))
  RETURNS TEXT
  AS $$
DECLARE
  nearcountry RECORD;
BEGIN
  FOR nearcountry IN
    SELECT distinct country_default_language_code from country_name
    WHERE country_code = search_country_code limit 1
  LOOP
    RETURN lower(nearcountry.country_default_language_code);
  END LOOP;
  RETURN NULL;
END;
$$
LANGUAGE plpgsql STABLE;


CREATE OR REPLACE FUNCTION get_partition(in_country_code VARCHAR(10))
  RETURNS INTEGER
  AS $$
DECLARE
  nearcountry RECORD;
BEGIN
  FOR nearcountry IN
    SELECT partition from country_name where country_code = in_country_code
  LOOP
    RETURN nearcountry.partition;
  END LOOP;
  RETURN 0;
END;
$$
LANGUAGE plpgsql STABLE;


-- Find the parent of an address with addr:street/addr:place tag.
--
-- \param street     Value of addr:street or NULL if tag is missing.
-- \param place      Value of addr:place or NULL if tag is missing.
-- \param partition  Partition where to search the parent.
-- \param centroid   Location of the address.
--
-- \return Place ID of the parent if one was found, NULL otherwise.
CREATE OR REPLACE FUNCTION find_parent_for_address(street TEXT, place TEXT,
                                                   partition SMALLINT,
                                                   centroid GEOMETRY)
  RETURNS BIGINT
  AS $$
DECLARE
  parent_place_id BIGINT;
  word_ids INTEGER[];
BEGIN
  IF street is not null THEN
    -- Check for addr:street attributes
    -- Note that addr:street links can only be indexed, once the street itself is indexed
    word_ids := word_ids_from_name(street);
    IF word_ids is not null THEN
      parent_place_id := getNearestNamedRoadPlaceId(partition, centroid, word_ids);
      IF parent_place_id is not null THEN
        --DEBUG: RAISE WARNING 'Get parent form addr:street: %', parent.place_id;
        RETURN parent_place_id;
      END IF;
    END IF;
  END IF;

  -- Check for addr:place attributes.
  IF place is not null THEN
    word_ids := word_ids_from_name(place);
    IF word_ids is not null THEN
      parent_place_id := getNearestNamedPlacePlaceId(partition, centroid, word_ids);
      IF parent_place_id is not null THEN
        --DEBUG: RAISE WARNING 'Get parent form addr:place: %', parent.place_id;
        RETURN parent_place_id;
      END IF;
    END IF;
  END IF;

  RETURN NULL;
END;
$$
LANGUAGE plpgsql STABLE;

CREATE OR REPLACE FUNCTION delete_location(OLD_place_id BIGINT)
  RETURNS BOOLEAN
  AS $$
DECLARE
BEGIN
  DELETE FROM location_area where place_id = OLD_place_id;
-- TODO:location_area
  RETURN true;
END;
$$
LANGUAGE plpgsql;


CREATE OR REPLACE FUNCTION add_location(place_id BIGINT, country_code varchar(2),
                                        partition INTEGER, keywords INTEGER[],
                                        rank_search INTEGER, rank_address INTEGER,
                                        in_postcode TEXT, geometry GEOMETRY)
  RETURNS BOOLEAN
  AS $$
DECLARE
  locationid INTEGER;
  centroid GEOMETRY;
  diameter FLOAT;
  x BOOLEAN;
  splitGeom RECORD;
  secgeo GEOMETRY;
  postcode TEXT;
BEGIN

  IF rank_search > 25 THEN
    RAISE EXCEPTION 'Adding location with rank > 25 (% rank %)', place_id, rank_search;
  END IF;

  x := deleteLocationArea(partition, place_id, rank_search);

  -- add postcode only if it contains a single entry, i.e. ignore postcode lists
  postcode := NULL;
  IF in_postcode is not null AND in_postcode not similar to '%(,|;)%' THEN
      postcode := upper(trim (in_postcode));
  END IF;

  IF ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon') THEN
    centroid := ST_Centroid(geometry);

    FOR secgeo IN select split_geometry(geometry) AS geom LOOP
      x := insertLocationAreaLarge(partition, place_id, country_code, keywords, rank_search, rank_address, false, postcode, centroid, secgeo);
    END LOOP;

  ELSE

    diameter := 0.02;
    IF rank_address = 0 THEN
      diameter := 0.02;
    ELSEIF rank_search <= 14 THEN
      diameter := 1.2;
    ELSEIF rank_search <= 15 THEN
      diameter := 1;
    ELSEIF rank_search <= 16 THEN
      diameter := 0.5;
    ELSEIF rank_search <= 17 THEN
      diameter := 0.2;
    ELSEIF rank_search <= 21 THEN
      diameter := 0.05;
    ELSEIF rank_search = 25 THEN
      diameter := 0.005;
    END IF;

--    RAISE WARNING 'adding % diameter %', place_id, diameter;

    secgeo := ST_Buffer(geometry, diameter);
    x := insertLocationAreaLarge(partition, place_id, country_code, keywords, rank_search, rank_address, true, postcode, ST_Centroid(geometry), secgeo);

  END IF;

  RETURN true;
END;
$$
LANGUAGE plpgsql;


CREATE OR REPLACE FUNCTION quad_split_geometry(geometry GEOMETRY, maxarea FLOAT,
                                               maxdepth INTEGER)
  RETURNS SETOF GEOMETRY
  AS $$
DECLARE
  xmin FLOAT;
  ymin FLOAT;
  xmax FLOAT;
  ymax FLOAT;
  xmid FLOAT;
  ymid FLOAT;
  secgeo GEOMETRY;
  secbox GEOMETRY;
  seg INTEGER;
  geo RECORD;
  area FLOAT;
  remainingdepth INTEGER;
  added INTEGER;
BEGIN

--  RAISE WARNING 'quad_split_geometry: maxarea=%, depth=%',maxarea,maxdepth;

  IF (ST_GeometryType(geometry) not in ('ST_Polygon','ST_MultiPolygon') OR NOT ST_IsValid(geometry)) THEN
    RETURN NEXT geometry;
    RETURN;
  END IF;

  remainingdepth := maxdepth - 1;
  area := ST_AREA(geometry);
  IF remainingdepth < 1 OR area < maxarea THEN
    RETURN NEXT geometry;
    RETURN;
  END IF;

  xmin := st_xmin(geometry);
  xmax := st_xmax(geometry);
  ymin := st_ymin(geometry);
  ymax := st_ymax(geometry);
  secbox := ST_SetSRID(ST_MakeBox2D(ST_Point(ymin,xmin),ST_Point(ymax,xmax)),4326);

  -- if the geometry completely covers the box don't bother to slice any more
  IF ST_AREA(secbox) = area THEN
    RETURN NEXT geometry;
    RETURN;
  END IF;

  xmid := (xmin+xmax)/2;
  ymid := (ymin+ymax)/2;

  added := 0;
  FOR seg IN 1..4 LOOP

    IF seg = 1 THEN
      secbox := ST_SetSRID(ST_MakeBox2D(ST_Point(xmin,ymin),ST_Point(xmid,ymid)),4326);
    END IF;
    IF seg = 2 THEN
      secbox := ST_SetSRID(ST_MakeBox2D(ST_Point(xmin,ymid),ST_Point(xmid,ymax)),4326);
    END IF;
    IF seg = 3 THEN
      secbox := ST_SetSRID(ST_MakeBox2D(ST_Point(xmid,ymin),ST_Point(xmax,ymid)),4326);
    END IF;
    IF seg = 4 THEN
      secbox := ST_SetSRID(ST_MakeBox2D(ST_Point(xmid,ymid),ST_Point(xmax,ymax)),4326);
    END IF;

    IF st_intersects(geometry, secbox) THEN
      secgeo := st_intersection(geometry, secbox);
      IF NOT ST_IsEmpty(secgeo) AND ST_GeometryType(secgeo) in ('ST_Polygon','ST_MultiPolygon') THEN
        FOR geo IN select quad_split_geometry(secgeo, maxarea, remainingdepth) as geom LOOP
          IF NOT ST_IsEmpty(geo.geom) AND ST_GeometryType(geo.geom) in ('ST_Polygon','ST_MultiPolygon') THEN
            added := added + 1;
            RETURN NEXT geo.geom;
          END IF;
        END LOOP;
      END IF;
    END IF;
  END LOOP;

  RETURN;
END;
$$
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACE FUNCTION split_geometry(geometry GEOMETRY)
  RETURNS SETOF GEOMETRY
  AS $$
DECLARE
  geo RECORD;
BEGIN
  -- 10000000000 is ~~ 1x1 degree
  FOR geo IN select quad_split_geometry(geometry, 0.25, 20) as geom LOOP
    RETURN NEXT geo.geom;
  END LOOP;
  RETURN;
END;
$$
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACE FUNCTION place_force_delete(placeid BIGINT)
  RETURNS BOOLEAN
  AS $$
DECLARE
    osmid BIGINT;
    osmtype character(1);
    pclass text;
    ptype text;
BEGIN
  SELECT osm_type, osm_id, class, type FROM placex WHERE place_id = placeid INTO osmtype, osmid, pclass, ptype;
  DELETE FROM import_polygon_delete where osm_type = osmtype and osm_id = osmid and class = pclass and type = ptype;
  DELETE FROM import_polygon_error where osm_type = osmtype and osm_id = osmid and class = pclass and type = ptype;
  -- force delete from place/placex by making it a very small geometry
  UPDATE place set geometry = ST_SetSRID(ST_Point(0,0), 4326) where osm_type = osmtype and osm_id = osmid and class = pclass and type = ptype;
  DELETE FROM place where osm_type = osmtype and osm_id = osmid and class = pclass and type = ptype;

  RETURN TRUE;
END;
$$
LANGUAGE plpgsql;


CREATE OR REPLACE FUNCTION place_force_update(placeid BIGINT)
  RETURNS BOOLEAN
  AS $$
DECLARE
  placegeom GEOMETRY;
  geom GEOMETRY;
  diameter FLOAT;
  rank INTEGER;
BEGIN
  UPDATE placex SET indexed_status = 2 WHERE place_id = placeid;
  SELECT geometry, rank_search FROM placex WHERE place_id = placeid INTO placegeom, rank;
  IF placegeom IS NOT NULL AND ST_IsValid(placegeom) THEN
    IF ST_GeometryType(placegeom) in ('ST_Polygon','ST_MultiPolygon') THEN
      FOR geom IN select split_geometry(placegeom) FROM placex WHERE place_id = placeid LOOP
        update placex set indexed_status = 2 where (st_covers(geom, placex.geometry) OR ST_Intersects(geom, placex.geometry)) 
        AND rank_search > rank and indexed_status = 0 and ST_geometrytype(placex.geometry) = 'ST_Point' and (rank_search < 28 or name is not null or (rank >= 16 and address ? 'place'));
        update placex set indexed_status = 2 where (st_covers(geom, placex.geometry) OR ST_Intersects(geom, placex.geometry)) 
        AND rank_search > rank and indexed_status = 0 and ST_geometrytype(placex.geometry) != 'ST_Point' and (rank_search < 28 or name is not null or (rank >= 16 and address ? 'place'));
      END LOOP;
    ELSE
        diameter := 0;
        IF rank = 11 THEN
          diameter := 0.05;
        ELSEIF rank < 18 THEN
          diameter := 0.1;
        ELSEIF rank < 20 THEN
          diameter := 0.05;
        ELSEIF rank = 21 THEN
          diameter := 0.001;
        ELSEIF rank < 24 THEN
          diameter := 0.02;
        ELSEIF rank < 26 THEN
          diameter := 0.002; -- 100 to 200 meters
        ELSEIF rank < 28 THEN
          diameter := 0.001; -- 50 to 100 meters
        END IF;
        IF diameter > 0 THEN
          IF rank >= 26 THEN
            -- roads may cause reparenting for >27 rank places
            update placex set indexed_status = 2 where indexed_status = 0 and rank_search > rank and ST_DWithin(placex.geometry, placegeom, diameter);
          ELSEIF rank >= 16 THEN
            -- up to rank 16, street-less addresses may need reparenting
            update placex set indexed_status = 2 where indexed_status = 0 and rank_search > rank and ST_DWithin(placex.geometry, placegeom, diameter) and (rank_search < 28 or name is not null or address ? 'place');
          ELSE
            -- for all other places the search terms may change as well
            update placex set indexed_status = 2 where indexed_status = 0 and rank_search > rank and ST_DWithin(placex.geometry, placegeom, diameter) and (rank_search < 28 or name is not null);
          END IF;
        END IF;
    END IF;
    RETURN TRUE;
  END IF;

  RETURN FALSE;
END;
$$
LANGUAGE plpgsql;