--DO NOT MODIFY THIS FILE, IT IS GENERATED AUTOMATICALLY FROM SOURCES
-- Complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION crankshaft" to load this file. \quit
-- Version number of the extension release
CREATE OR REPLACE FUNCTION cdb_crankshaft_version()
RETURNS text AS $$
  SELECT '0.3.1'::text;
$$ language 'sql' STABLE STRICT;

-- Internal identifier of the installed extension instence
-- e.g. 'dev' for current development version
CREATE OR REPLACE FUNCTION _cdb_crankshaft_internal_version()
RETURNS text AS $$
  SELECT installed_version FROM pg_available_extensions where name='crankshaft' and pg_available_extensions IS NOT NULL;
$$ language 'sql' STABLE STRICT;
-- Internal function.
-- Set the seeds of the RNGs (Random Number Generators)
-- used internally.
CREATE OR REPLACE FUNCTION
_cdb_random_seeds (seed_value INTEGER) RETURNS VOID
AS $$
  from crankshaft import random_seeds
  random_seeds.set_random_seeds(seed_value)
$$ LANGUAGE plpythonu;
CREATE OR REPLACE FUNCTION
    CDB_PyAggS(current_state Numeric[], current_row Numeric[]) 
    returns NUMERIC[] as $$
    BEGIN
        if array_upper(current_state,1) is null  then
            RAISE NOTICE 'setting state %',array_upper(current_row,1);
            current_state[1] = array_upper(current_row,1);
        end if;
        return array_cat(current_state,current_row) ;
    END
    $$ LANGUAGE plpgsql;

-- Create aggregate if it did not exist
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT *
        FROM pg_catalog.pg_proc p
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
        WHERE n.nspname = 'cdb_crankshaft'
            AND p.proname = 'cdb_pyagg'
            AND p.proisagg)
    THEN
        CREATE AGGREGATE CDB_PyAgg(NUMERIC[]) (
            SFUNC = CDB_PyAggS,
            STYPE = Numeric[],
            INITCOND = "{}"
        );
    END IF;
END
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION
  CDB_CreateAndPredictSegment(
    target NUMERIC[],
    features NUMERIC[],
    target_features NUMERIC[],
    target_ids NUMERIC[],
    n_estimators INTEGER DEFAULT 1200,
    max_depth INTEGER DEFAULT 3,
    subsample DOUBLE PRECISION DEFAULT 0.5,
    learning_rate DOUBLE PRECISION DEFAULT 0.01,
    min_samples_leaf INTEGER DEFAULT 1)
RETURNS TABLE(cartodb_id NUMERIC, prediction NUMERIC, accuracy NUMERIC)
AS $$
    import numpy as np
    import plpy

    from crankshaft.segmentation import create_and_predict_segment_agg
    model_params = {'n_estimators': n_estimators,
                    'max_depth': max_depth,
                    'subsample': subsample,
                    'learning_rate': learning_rate,
                    'min_samples_leaf': min_samples_leaf}

    def unpack2D(data):
        dimension = data.pop(0)
        a = np.array(data, dtype=float)
        return a.reshape(len(a)/dimension, dimension)

    return create_and_predict_segment_agg(np.array(target, dtype=float),
            unpack2D(features),
            unpack2D(target_features),
            target_ids,
            model_params)

$$ LANGUAGE plpythonu;

CREATE OR REPLACE FUNCTION
  CDB_CreateAndPredictSegment (
      query TEXT,
      variable_name TEXT,
      target_table TEXT,
      n_estimators INTEGER DEFAULT 1200,
      max_depth INTEGER DEFAULT 3,
      subsample DOUBLE PRECISION DEFAULT 0.5,
      learning_rate DOUBLE PRECISION DEFAULT 0.01,
      min_samples_leaf INTEGER DEFAULT 1)
RETURNS TABLE (cartodb_id TEXT, prediction NUMERIC, accuracy NUMERIC)
AS $$
  from crankshaft.segmentation import create_and_predict_segment
  model_params = {'n_estimators': n_estimators, 'max_depth':max_depth, 'subsample' : subsample, 'learning_rate': learning_rate, 'min_samples_leaf' : min_samples_leaf}
  return create_and_predict_segment(query,variable_name,target_table, model_params)
$$ LANGUAGE plpythonu;
CREATE OR REPLACE FUNCTION CDB_Gravity(
    IN target_query text,
    IN weight_column text,
    IN source_query text,
    IN pop_column text,
    IN target bigint,
    IN radius integer,
    IN minval numeric DEFAULT -10e307
    )
RETURNS TABLE(
    the_geom geometry,
    source_id bigint,
    target_id bigint,
    dist numeric,
    h numeric,
    hpop numeric)  AS $$
DECLARE
    t_id bigint[];
    t_geom geometry[];
    t_weight numeric[];
    s_id bigint[];
    s_geom geometry[];
    s_pop numeric[];
BEGIN
    EXECUTE 'WITH foo as('+target_query+') SELECT array_agg(cartodb_id), array_agg(the_geom), array_agg(' || weight_column || ') FROM foo' INTO t_id, t_geom, t_weight;
    EXECUTE 'WITH foo as('+source_query+') SELECT array_agg(cartodb_id), array_agg(the_geom), array_agg(' || pop_column || ') FROM foo' INTO s_id, s_geom, s_pop;
    RETURN QUERY
    SELECT g.* FROM t, s, CDB_Gravity(t_id, t_geom, t_weight, s_id, s_geom, s_pop, target, radius, minval) g;
END;
$$ language plpgsql;

CREATE OR REPLACE FUNCTION CDB_Gravity(
    IN t_id bigint[],
    IN t_geom geometry[],
    IN t_weight numeric[],
    IN s_id bigint[],
    IN s_geom geometry[],
    IN s_pop numeric[],
    IN target bigint,
    IN radius integer,
    IN minval numeric DEFAULT -10e307
    )
RETURNS TABLE(
    the_geom geometry,
    source_id bigint,
    target_id bigint,
    dist numeric,
    h numeric,
    hpop numeric)  AS $$
DECLARE
    t_type text;
    s_type text;
    t_center geometry[];
    s_center geometry[];
BEGIN
    t_type := GeometryType(t_geom[1]);
    s_type := GeometryType(s_geom[1]);
    IF t_type = 'POINT' THEN
        t_center := t_geom;
    ELSE
        WITH tmp as (SELECT unnest(t_geom) as g) SELECT array_agg(ST_Centroid(g)) INTO t_center FROM tmp;
    END IF;
    IF s_type = 'POINT' THEN
        s_center := s_geom;
    ELSE
        WITH tmp as (SELECT unnest(s_geom) as g) SELECT array_agg(ST_Centroid(g)) INTO s_center FROM tmp;
    END IF;
    RETURN QUERY
        with target0 as(
            SELECT unnest(t_center) as tc, unnest(t_weight) as tw, unnest(t_id) as td
        ),
        source0 as(
            SELECT unnest(s_center) as sc, unnest(s_id) as sd, unnest (s_geom) as sg, unnest(s_pop) as sp
        ),
        prev0 as(
            SELECT
                source0.sg,
                source0.sd as sourc_id,
                coalesce(source0.sp,0) as sp,
                target.td as targ_id,
                coalesce(target.tw,0) as tw,
                GREATEST(1.0,ST_Distance(geography(target.tc), geography(source0.sc)))::numeric as distance
            FROM source0
            CROSS JOIN LATERAL
                (
                SELECT
                    *
                FROM target0
                    WHERE tw > minval
                    AND ST_DWithin(geography(source0.sc), geography(tc), radius)
                ) AS target
        ),
        deno as(
            SELECT
                sourc_id,
                sum(tw/distance) as h_deno
            FROM
                prev0
            GROUP BY sourc_id
        )
        SELECT
            p.sg as the_geom,
            p.sourc_id as source_id,
            p.targ_id as target_id,
            case when p.distance > 1 then p.distance else 0.0 end as dist,
            100*(p.tw/p.distance)/d.h_deno as h,
            p.sp*(p.tw/p.distance)/d.h_deno as hpop
        FROM
            prev0 p,
            deno d
        WHERE
            p.targ_id = target AND
            p.sourc_id = d.sourc_id;
END;
$$ language plpgsql;
-- 0: nearest neighbor
-- 1: barymetric
-- 2: IDW

CREATE OR REPLACE FUNCTION CDB_SpatialInterpolation(
    IN query text,
    IN point geometry,
    IN method integer DEFAULT 1,
    IN p1 numeric DEFAULT 0,
    IN p2 numeric DEFAULT 0
    )
RETURNS numeric AS
$$
DECLARE
    gs geometry[];
    vs numeric[];
    output numeric;
BEGIN
    EXECUTE 'WITH a AS('||query||') SELECT array_agg(the_geom), array_agg(attrib) FROM a' INTO gs, vs;
    SELECT CDB_SpatialInterpolation(gs, vs, point, method, p1,p2) INTO output FROM a;

    RETURN output;
END;
$$
language plpgsql IMMUTABLE;

CREATE OR REPLACE FUNCTION CDB_SpatialInterpolation(
    IN geomin geometry[],
    IN colin numeric[],
    IN point geometry,
    IN method integer DEFAULT 1,
    IN p1 numeric DEFAULT 0,
    IN p2 numeric DEFAULT 0
    )
RETURNS numeric AS
$$
DECLARE
    gs geometry[];
    vs numeric[];
    gs2 geometry[];
    vs2 numeric[];
    g geometry;
    vertex geometry[];
    sg numeric;
    sa numeric;
    sb numeric;
    sc numeric;
    va numeric;
    vb numeric;
    vc numeric;
    output numeric;
BEGIN
    output :=  -999.999;
    -- nearest
    IF method = 0 THEN

        WITH    a as (SELECT unnest(geomin) as g, unnest(colin) as v)
        SELECT a.v INTO output FROM a ORDER BY point<->a.g LIMIT 1;
        RETURN output;

    -- barymetric
    ELSIF method = 1 THEN
        WITH    a as (SELECT unnest(geomin) AS e),
                b as (SELECT ST_DelaunayTriangles(ST_Collect(a.e),0.001, 0) AS t FROM a),
                c as (SELECT (ST_Dump(t)).geom as v FROM b),
                d as (SELECT v FROM c WHERE ST_Within(point, v))
            SELECT v INTO g FROM d;
        IF g is null THEN
            -- out of the realm of the input data
            RETURN -888.888;
        END IF;
        -- vertex of the selected cell
        WITH a AS (SELECT (ST_DumpPoints(g)).geom AS v)
                SELECT array_agg(v) INTO vertex FROM a;

            -- retrieve the value of each vertex
        WITH a AS(SELECT unnest(geomin) as geo, unnest(colin) as c)
            SELECT c INTO va FROM a WHERE ST_Equals(geo, vertex[1]);
        WITH a AS(SELECT unnest(geomin) as geo, unnest(colin) as c)
            SELECT c INTO vb FROM a WHERE ST_Equals(geo, vertex[2]);
        WITH a AS(SELECT unnest(geomin) as geo, unnest(colin) as c)
                SELECT c INTO vc FROM a WHERE ST_Equals(geo, vertex[3]);

        SELECT ST_area(g), ST_area(ST_MakePolygon(ST_MakeLine(ARRAY[point, vertex[2], vertex[3], point]))), ST_area(ST_MakePolygon(ST_MakeLine(ARRAY[point, vertex[1], vertex[3], point]))), ST_area(ST_MakePolygon(ST_MakeLine(ARRAY[point,vertex[1],vertex[2], point]))) INTO sg, sa, sb, sc;

        output := (coalesce(sa,0) * coalesce(va,0) + coalesce(sb,0) * coalesce(vb,0) + coalesce(sc,0) * coalesce(vc,0)) / coalesce(sg);
        RETURN output;

    -- IDW
    -- p1: limit the number of neighbors, 0->no limit
    -- p2: order of distance decay, 0-> order 1
    ELSIF method = 2 THEN

        IF p2 = 0 THEN
            p2 := 1;
        END IF;

        WITH    a as (SELECT unnest(geomin) as g, unnest(colin) as v),
                b as (SELECT a.g, a.v FROM a ORDER BY point<->a.g)
        SELECT array_agg(b.g), array_agg(b.v) INTO gs, vs FROM b;
        IF p1::integer>0 THEN
            gs2:=gs;
            vs2:=vs;
            FOR i IN 1..p1
            LOOP
                gs2 := gs2 || gs[i];
                vs2 := vs2 || vs[i];
            END LOOP;
        ELSE
            gs2:=gs;
            vs2:=vs;
        END IF;

        WITH    a as (SELECT unnest(gs2) as g, unnest(vs2) as v),
                b as (
                    SELECT
                    (1/ST_distance(point, a.g)^p2::integer) as k,
                    (a.v/ST_distance(point, a.g)^p2::integer) as f
                    FROM a
                )
        SELECT sum(b.f)/sum(b.k) INTO output FROM b;
        RETURN output;

    END IF;

    RETURN -777.777;

END;
$$
language plpgsql IMMUTABLE;
-- =============================================================================================
--
-- CDB_Voronoi
--
-- =============================================================================================
CREATE OR REPLACE FUNCTION CDB_voronoi(
    IN geomin geometry[],
    IN buffer numeric DEFAULT 0.5,
    IN tolerance numeric DEFAULT 1e-9
    )
RETURNS geometry  AS $$
DECLARE
    geomout geometry;
BEGIN
    -- we need to make the geometry calculations in (pseudo)meters!!!
    with a as (
        SELECT unnest(geomin) as g1
    ),
    b as(
        SELECT st_transform(g1, 3857) g2 from a
    )
    SELECT array_agg(g2) INTO geomin from b;

    WITH
    convexhull_1 as (
        SELECT
            ST_ConvexHull(ST_Collect(geomin)) as g,
            buffer * |/ st_area(ST_ConvexHull(ST_Collect(geomin))) as r
    ),
    clipper as(
        SELECT
            st_buffer(ST_MinimumBoundingCircle(a.g), buffer*a.r)  as g
        FROM convexhull_1 a
    ),
    env0 as (
        SELECT
            (st_dumppoints(st_expand(a.g, buffer*a.r))).geom as e
        FROM  convexhull_1 a
    ),
    env as (
        SELECT
            array_agg(env0.e) as e
        FROM  env0
    ),
    sample AS (
        SELECT
            ST_Collect(geomin || env.e) as geom
        FROM env
    ),
    convexhull as (
        SELECT
            ST_ConvexHull(ST_Collect(geomin)) as cg
    ),
    tin as (
        SELECT
            ST_Dump(ST_DelaunayTriangles(geom, tolerance, 0)) as gd
        FROM
            sample
    ),
    tin_polygons as (
        SELECT
            (gd).Path as id,
            (gd).Geom as pg,
            ST_Centroid(ST_MinimumBoundingCircle((gd).Geom, 180)) as ct
        FROM tin
    ),
    tin_lines as (
        SELECT
            id,
            ST_ExteriorRing(pg) as lg
        FROM tin_polygons
    ),
    tin_nodes as (
        SELECT
            id,
            ST_PointN(lg,1) p1,
            ST_PointN(lg,2) p2,
            ST_PointN(lg,3) p3
        FROM tin_lines
    ),
    tin_edges AS (
        SELECT
            p.id,
            UNNEST(ARRAY[
            ST_MakeLine(n.p1,n.p2) ,
            ST_MakeLine(n.p2,n.p3) ,
            ST_MakeLine(n.p3,n.p1)]) as Edge,
            ST_Force2D(cdb_crankshaft._Find_Circle(n.p1,n.p2,n.p3)) as ct,
            CASE WHEN st_distance(p.ct, ST_ExteriorRing(p.pg)) < tolerance THEN
                TRUE
            ELSE  FALSE END AS ctx,
            p.pg,
            ST_within(p.ct, convexhull.cg) as ctin
        FROM
            tin_polygons p,
            tin_nodes n,
            convexhull
        WHERE p.id = n.id
    ),
    voro_nodes as (
        SELECT
            CASE WHEN x.ctx = TRUE THEN
                ST_Centroid(x.edge)
            ELSE
                x.ct
            END as xct,
            CASE WHEN y.id is null THEN
                CASE WHEN x.ctin = TRUE THEN
                    ST_SetSRID(ST_MakePoint(
                        ST_X(x.ct) + ((ST_X(ST_Centroid(x.edge)) - ST_X(x.ct)) * (1+buffer)),
                        ST_Y(x.ct) + ((ST_Y(ST_Centroid(x.edge)) - ST_Y(x.ct)) * (1+buffer))
                    ), ST_SRID(x.ct))
                END
            ELSE
                y.ct
            END as yct
        FROM
            tin_edges x
        LEFT OUTER JOIN
            tin_edges y
        ON x.id <> y.id AND ST_Equals(x.edge, y.edge)
    ),
    voro_edges as(
        SELECT
            ST_LineMerge(ST_Collect(ST_MakeLine(xct, yct))) as v
        FROM
            voro_nodes
    ),
    voro_cells as(
        SELECT
            ST_Polygonize(
                ST_Node(
                    ST_LineMerge(
                        ST_Union(v, ST_ExteriorRing(
                            ST_Convexhull(v)
                            )
                        )
                    )
                )
            ) as g
        FROM
            voro_edges
    ),
    voro_set as(
        SELECT
        (st_dump(v.g)).geom as g
        FROM voro_cells v
    )
    SELECT
        st_collect(
            ST_Transform(ST_intersection(c.g, v.g), 4326)
        )
    INTO geomout
    FROM
        voro_set v,
        clipper c;
    RETURN geomout;
END;
$$ language plpgsql IMMUTABLE;

/** ----------------------------------------------------------------------------------------
  * @function   : FindCircle
  * @precis     : Function that determines if three points form a circle. If so a table containing
  *               centre and radius is returned. If not, a null table is returned.
  * @version    : 1.0.1
  * @param      : p_pt1        : First point in curve
  * @param      : p_pt2        : Second point in curve
  * @param      : p_pt3        : Third point in curve
  * @return     : geometry     : In which X,Y ordinates are the centre X, Y and the Z being the radius of found circle
  *                              or NULL if three points do not form a circle.
  * @history    : Simon Greener - Feb 2012 - Original coding.
  *               Rafa de la Torre - Aug 2016 - Small fix for type checking
  * @copyright  : Simon Greener @ 2012
  *               Licensed under a Creative Commons Attribution-Share Alike 2.5 Australia License. (http://creativecommons.org/licenses/by-sa/2.5/au/)
**/
CREATE OR REPLACE FUNCTION _Find_Circle(
    IN p_pt1 geometry,
    IN p_pt2 geometry,
    IN p_pt3 geometry)
  RETURNS geometry AS
$BODY$
DECLARE
   v_Centre geometry;
   v_radius NUMERIC;
   v_CX     NUMERIC;
   v_CY     NUMERIC;
   v_dA     NUMERIC;
   v_dB     NUMERIC;
   v_dC     NUMERIC;
   v_dD     NUMERIC;
   v_dE     NUMERIC;
   v_dF     NUMERIC;
   v_dG     NUMERIC;
BEGIN
   IF ( p_pt1 IS NULL OR p_pt2 IS NULL OR p_pt3 IS NULL ) THEN
      RAISE EXCEPTION 'All supplied points must be not null.';
      RETURN NULL;
   END IF;
   IF ( ST_GeometryType(p_pt1) <> 'ST_Point' OR
        ST_GeometryType(p_pt2) <> 'ST_Point' OR
        ST_GeometryType(p_pt3) <> 'ST_Point' ) THEN
      RAISE EXCEPTION 'All supplied geometries must be points.';
      RETURN NULL;
   END IF;
   v_dA := ST_X(p_pt2) - ST_X(p_pt1);
   v_dB := ST_Y(p_pt2) - ST_Y(p_pt1);
   v_dC := ST_X(p_pt3) - ST_X(p_pt1);
   v_dD := ST_Y(p_pt3) - ST_Y(p_pt1);
   v_dE := v_dA * (ST_X(p_pt1) + ST_X(p_pt2)) + v_dB * (ST_Y(p_pt1) + ST_Y(p_pt2));
   v_dF := v_dC * (ST_X(p_pt1) + ST_X(p_pt3)) + v_dD * (ST_Y(p_pt1) + ST_Y(p_pt3));
   v_dG := 2.0  * (v_dA * (ST_Y(p_pt3) - ST_Y(p_pt2)) - v_dB * (ST_X(p_pt3) - ST_X(p_pt2)));
   -- If v_dG is zero then the three points are collinear and no finite-radius
   -- circle through them exists.
   IF ( v_dG = 0 ) THEN
      RETURN NULL;
   ELSE
      v_CX := (v_dD * v_dE - v_dB * v_dF) / v_dG;
      v_CY := (v_dA * v_dF - v_dC * v_dE) / v_dG;
      v_Radius := SQRT(POWER(ST_X(p_pt1) - v_CX,2) + POWER(ST_Y(p_pt1) - v_CY,2) );
   END IF;
   RETURN ST_SetSRID(ST_MakePoint(v_CX, v_CY, v_radius),ST_Srid(p_pt1));
END;
$BODY$
  LANGUAGE plpgsql VOLATILE STRICT;

-- Moran's I Global Measure (public-facing)
CREATE OR REPLACE FUNCTION
  CDB_AreasOfInterestGlobal(
      subquery TEXT,
      column_name TEXT,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
      permutations INT DEFAULT 99,
      geom_col TEXT DEFAULT 'the_geom',
      id_col TEXT DEFAULT 'cartodb_id')
RETURNS TABLE (moran NUMERIC, significance NUMERIC)
AS $$
  from crankshaft.clustering import moran_local
  # TODO: use named parameters or a dictionary
  return moran(subquery, column_name, w_type, num_ngbrs, permutations, geom_col, id_col)
$$ LANGUAGE plpythonu;

-- Moran's I Local (internal function)
CREATE OR REPLACE FUNCTION
  _CDB_AreasOfInterestLocal(
      subquery TEXT,
      column_name TEXT,
      w_type TEXT,
      num_ngbrs INT,
      permutations INT,
      geom_col TEXT,
      id_col TEXT)
RETURNS TABLE (moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$
  from crankshaft.clustering import moran_local
  # TODO: use named parameters or a dictionary
  return moran_local(subquery, column_name, w_type, num_ngbrs, permutations, geom_col, id_col)
$$ LANGUAGE plpythonu;

-- Moran's I Local (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_AreasOfInterestLocal(
    subquery TEXT,
    column_name TEXT,
    w_type TEXT DEFAULT 'knn',
    num_ngbrs INT DEFAULT 5,
    permutations INT DEFAULT 99,
    geom_col TEXT DEFAULT 'the_geom',
    id_col TEXT DEFAULT 'cartodb_id')
RETURNS TABLE (moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocal(subquery, column_name, w_type, num_ngbrs, permutations, geom_col, id_col);

$$ LANGUAGE SQL;

-- Moran's I only for HH and HL (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_GetSpatialHotspots(
    subquery TEXT,
    column_name TEXT,
    w_type TEXT DEFAULT 'knn',
    num_ngbrs INT DEFAULT 5,
    permutations INT DEFAULT 99,
    geom_col TEXT DEFAULT 'the_geom',
    id_col TEXT DEFAULT 'cartodb_id')
    RETURNS TABLE (moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocal(subquery, column_name, w_type, num_ngbrs, permutations, geom_col, id_col)
  WHERE quads IN ('HH', 'HL');

$$ LANGUAGE SQL;

-- Moran's I only for LL and LH (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_GetSpatialColdspots(
    subquery TEXT,
    attr TEXT,
    w_type TEXT DEFAULT 'knn',
    num_ngbrs INT DEFAULT 5,
    permutations INT DEFAULT 99,
    geom_col TEXT DEFAULT 'the_geom',
    id_col TEXT DEFAULT 'cartodb_id')
    RETURNS TABLE (moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocal(subquery, attr, w_type, num_ngbrs, permutations, geom_col, id_col)
  WHERE quads IN ('LL', 'LH');

$$ LANGUAGE SQL;

-- Moran's I only for LH and HL (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_GetSpatialOutliers(
    subquery TEXT,
    attr TEXT,
    w_type TEXT DEFAULT 'knn',
    num_ngbrs INT DEFAULT 5,
    permutations INT DEFAULT 99,
    geom_col TEXT DEFAULT 'the_geom',
    id_col TEXT DEFAULT 'cartodb_id')
    RETURNS TABLE (moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocal(subquery, attr, w_type, num_ngbrs, permutations, geom_col, id_col)
  WHERE quads IN ('HL', 'LH');

$$ LANGUAGE SQL;

-- Moran's I Global Rate (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_AreasOfInterestGlobalRate(
      subquery TEXT,
      numerator TEXT,
      denominator TEXT,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
      permutations INT DEFAULT 99,
      geom_col TEXT DEFAULT 'the_geom',
      id_col TEXT DEFAULT 'cartodb_id')
RETURNS TABLE (moran FLOAT, significance FLOAT)
AS $$
  from crankshaft.clustering import moran_local
  # TODO: use named parameters or a dictionary
  return moran_rate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)
$$ LANGUAGE plpythonu;


-- Moran's I Local Rate (internal function)
CREATE OR REPLACE FUNCTION
  _CDB_AreasOfInterestLocalRate(
      subquery TEXT,
      numerator TEXT,
      denominator TEXT,
      w_type TEXT,
      num_ngbrs INT,
      permutations INT,
      geom_col TEXT,
      id_col TEXT)
RETURNS
TABLE(moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$
  from crankshaft.clustering import moran_local_rate
  # TODO: use named parameters or a dictionary
  return moran_local_rate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)
$$ LANGUAGE plpythonu;

-- Moran's I Local Rate (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_AreasOfInterestLocalRate(
      subquery TEXT,
      numerator TEXT,
      denominator TEXT,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
      permutations INT DEFAULT 99,
      geom_col TEXT DEFAULT 'the_geom',
      id_col TEXT DEFAULT 'cartodb_id')
RETURNS
TABLE(moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocalRate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col);

$$ LANGUAGE SQL;

-- Moran's I Local Rate only for HH and HL (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_GetSpatialHotspotsRate(
      subquery TEXT,
      numerator TEXT,
      denominator TEXT,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
      permutations INT DEFAULT 99,
      geom_col TEXT DEFAULT 'the_geom',
      id_col TEXT DEFAULT 'cartodb_id')
RETURNS
TABLE(moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocalRate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)
  WHERE quads IN ('HH', 'HL');

$$ LANGUAGE SQL;

-- Moran's I Local Rate only for LL and LH (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_GetSpatialColdspotsRate(
      subquery TEXT,
      numerator TEXT,
      denominator TEXT,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
      permutations INT DEFAULT 99,
      geom_col TEXT DEFAULT 'the_geom',
      id_col TEXT DEFAULT 'cartodb_id')
RETURNS
TABLE(moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocalRate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)
  WHERE quads IN ('LL', 'LH');

$$ LANGUAGE SQL;

-- Moran's I Local Rate only for LH and HL (public-facing function)
CREATE OR REPLACE FUNCTION
  CDB_GetSpatialOutliersRate(
      subquery TEXT,
      numerator TEXT,
      denominator TEXT,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
      permutations INT DEFAULT 99,
      geom_col TEXT DEFAULT 'the_geom',
      id_col TEXT DEFAULT 'cartodb_id')
RETURNS
TABLE(moran NUMERIC, quads TEXT, significance NUMERIC, rowid INT, vals NUMERIC)
AS $$

  SELECT moran, quads, significance, rowid, vals
  FROM cdb_crankshaft._CDB_AreasOfInterestLocalRate(subquery, numerator, denominator, w_type, num_ngbrs, permutations, geom_col, id_col)
  WHERE quads IN ('HL', 'LH');

$$ LANGUAGE SQL;
CREATE OR REPLACE FUNCTION  CDB_KMeans(query text, no_clusters integer,no_init integer default 20)
RETURNS table (cartodb_id integer, cluster_no integer) as $$
    
    from crankshaft.clustering import kmeans
    return kmeans(query,no_clusters,no_init)

$$ language plpythonu;


CREATE OR REPLACE FUNCTION CDB_WeightedMeanS(state Numeric[],the_geom GEOMETRY(Point, 4326), weight NUMERIC)
RETURNS Numeric[] AS 
$$
DECLARE 
    newX NUMERIC;
    newY NUMERIC;
    newW NUMERIC;
BEGIN
    IF weight IS NULL OR the_geom IS NULL THEN 
        newX = state[1];
        newY = state[2];
        newW = state[3];
    ELSE
        newX = state[1] + ST_X(the_geom)*weight;
        newY = state[2] + ST_Y(the_geom)*weight;
        newW = state[3] + weight;
    END IF;
    RETURN Array[newX,newY,newW];

END
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION CDB_WeightedMeanF(state Numeric[])
RETURNS GEOMETRY AS 
$$
BEGIN
    IF state[3] = 0 THEN 
        RETURN ST_SetSRID(ST_MakePoint(state[1],state[2]), 4326);
    ELSE 
        RETURN ST_SETSRID(ST_MakePoint(state[1]/state[3], state[2]/state[3]),4326);
    END IF;
END
$$ LANGUAGE plpgsql;

-- Create aggregate if it did not exist
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT *
        FROM pg_catalog.pg_proc p
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
        WHERE n.nspname = 'cdb_crankshaft'
            AND p.proname = 'cdb_weightedmean'
            AND p.proisagg)
    THEN
        CREATE AGGREGATE CDB_WeightedMean(geometry(Point, 4326), NUMERIC) (
            SFUNC = CDB_WeightedMeanS,
            FINALFUNC = CDB_WeightedMeanF,
            STYPE = Numeric[],
            INITCOND = "{0.0,0.0,0.0}" 
        );
    END IF;
END
$$ LANGUAGE plpgsql;
-- Spatial Markov

-- input table format:
-- id | geom | date_1 | date_2 | date_3
--  1 | Pt1  | 12.3   | 13.1   | 14.2
--  2 | Pt2  | 11.0   | 13.2   | 12.5
--  ...
-- Sample Function call:
-- SELECT CDB_SpatialMarkov('SELECT * FROM real_estate',
--                          Array['date_1', 'date_2', 'date_3'])

CREATE OR REPLACE FUNCTION
  CDB_SpatialMarkovTrend (
      subquery TEXT,
      time_cols TEXT[],
      num_classes INT DEFAULT 7,
      w_type TEXT DEFAULT 'knn',
      num_ngbrs INT DEFAULT 5,
  	  permutations INT DEFAULT 99,
  	  geom_col TEXT DEFAULT 'the_geom',
  	  id_col TEXT DEFAULT 'cartodb_id')
RETURNS TABLE (trend NUMERIC, trend_up NUMERIC, trend_down NUMERIC, volatility NUMERIC, rowid INT)
AS $$

  from crankshaft.space_time_dynamics import spatial_markov_trend

  ## TODO: use named parameters or a dictionary
  return spatial_markov_trend(subquery, time_cols, num_classes, w_type, num_ngbrs, permutations, geom_col, id_col)
$$ LANGUAGE plpythonu;

-- input table format: identical to above but in a predictable format
-- Sample function call:
-- SELECT cdb_spatial_markov('SELECT * FROM real_estate',
--                           'date_1')


-- CREATE OR REPLACE FUNCTION
--   cdb_spatial_markov (
--       subquery TEXT,
--       time_col_min text,
--       time_col_max text,
--       date_format text, -- '_YYYY_MM_DD'
--       num_time_per_bin INT DEFAULT 1,
--   	  permutations INT DEFAULT 99,
--   	  geom_column TEXT DEFAULT 'the_geom',
--   	  id_col TEXT DEFAULT 'cartodb_id',
--       w_type TEXT DEFAULT 'knn',
--       num_ngbrs int DEFAULT 5)
-- RETURNS TABLE (moran FLOAT, quads TEXT, significance FLOAT, ids INT)
-- AS $$
--   plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
--   from crankshaft.clustering import moran_local
--   # TODO: use named parameters or a dictionary
--   return spatial_markov(subquery, time_cols, permutations, geom_column, id_col, w_type, num_ngbrs)
-- $$ LANGUAGE plpythonu;
--
-- -- input table format:
-- -- id | geom | date  | measurement
-- --  1 | Pt1  | 12/3  | 13.2
-- --  2 | Pt2  | 11/5  | 11.3
-- --  3 | Pt1  | 11/13 | 12.9
-- --  4 | Pt3  | 12/19 | 10.1
-- -- ...
--
-- CREATE OR REPLACE FUNCTION
--   cdb_spatial_markov (
--       subquery TEXT,
--       time_col text,
--       num_time_per_bin INT DEFAULT 1,
--   	  permutations INT DEFAULT 99,
--   	  geom_column TEXT DEFAULT 'the_geom',
--   	  id_col TEXT DEFAULT 'cartodb_id',
--       w_type TEXT DEFAULT 'knn',
--       num_ngbrs int DEFAULT 5)
-- RETURNS TABLE (moran FLOAT, quads TEXT, significance FLOAT, ids INT)
-- AS $$
--   plpy.execute('SELECT cdb_crankshaft._cdb_crankshaft_activate_py()')
--   from crankshaft.clustering import moran_local
--   # TODO: use named parameters or a dictionary
--   return spatial_markov(subquery, time_cols, permutations, geom_column, id_col, w_type, num_ngbrs)
-- $$ LANGUAGE plpythonu;
-- Function by Stuart Lynn for a simple interpolation of a value
-- from a polygon table over an arbitrary polygon
-- (weighted by the area proportion overlapped)
-- Aereal weighting is a very simple form of aereal interpolation.
--
-- Parameters:
--   * geom a Polygon geometry which defines the area where a value will be
--     estimated as the area-weighted sum of a given table/column
--   * target_table_name table name of the table that provides the values
--   * target_column column name of the column that provides the values
--   * schema_name optional parameter to defina the schema the target table
--     belongs to, which is necessary if its not in the search_path.
--     Note that target_table_name should never include the schema in it.
-- Return value:
--   Aereal-weighted interpolation of the column values over the geometry
CREATE OR REPLACE
FUNCTION cdb_overlap_sum(geom geometry, target_table_name text, target_column text, schema_name text DEFAULT NULL)
  RETURNS numeric AS
$$
DECLARE
	result numeric;
  qualified_name text;
BEGIN
  IF schema_name IS NULL THEN
    qualified_name := Format('%I', target_table_name);
  ELSE
    qualified_name := Format('%I.%s', schema_name, target_table_name);
  END IF;
  EXECUTE Format('
    SELECT sum(%I*ST_Area(St_Intersection($1, a.the_geom))/ST_Area(a.the_geom))
    FROM %s AS a
    WHERE $1 && a.the_geom
  ', target_column, qualified_name)
  USING geom
  INTO result;
  RETURN result;
END;
$$ LANGUAGE plpgsql;
--
-- Creates N points randomly distributed arround the polygon
--
-- @param g - the geometry to be turned in to points
--
-- @param no_points - the number of points to generate
--
-- @params max_iter_per_point - the function generates points in the polygon's bounding box
-- and discards points which don't lie in the polygon. max_iter_per_point specifies how many
-- misses per point the funciton accepts before giving up.
--
-- Returns: Multipoint with the requested points
CREATE OR REPLACE FUNCTION cdb_dot_density(geom geometry , no_points Integer, max_iter_per_point Integer DEFAULT 1000)
RETURNS GEOMETRY AS $$
DECLARE
  extent GEOMETRY;
  test_point Geometry;
  width                NUMERIC;
  height               NUMERIC;
  x0                   NUMERIC;
  y0                   NUMERIC;
  xp                   NUMERIC;
  yp                   NUMERIC;
  no_left              INTEGER;
  remaining_iterations INTEGER;
  points               GEOMETRY[];
  bbox_line            GEOMETRY;
  intersection_line    GEOMETRY;
BEGIN
  extent  := ST_Envelope(geom);
  width   := ST_XMax(extent) - ST_XMIN(extent);
  height  := ST_YMax(extent) - ST_YMIN(extent);
  x0 	  := ST_XMin(extent);
  y0 	  := ST_YMin(extent);
  no_left := no_points;

  LOOP
    if(no_left=0) THEN
      EXIT;
    END IF;
    yp = y0 + height*random();
    bbox_line  = ST_MakeLine(
      ST_SetSRID(ST_MakePoint(yp, x0),4326),
      ST_SetSRID(ST_MakePoint(yp, x0+width),4326)
    );
    intersection_line = ST_Intersection(bbox_line,geom);
  	test_point = ST_LineInterpolatePoint(st_makeline(st_linemerge(intersection_line)),random());
	  points := points || test_point;
	  no_left = no_left - 1 ;
  END LOOP;
  RETURN ST_Collect(points);
END;
$$
LANGUAGE plpgsql VOLATILE;
-- Make sure by default there are no permissions for publicuser
-- NOTE: this happens at extension creation time, as part of an implicit transaction.
-- REVOKE ALL PRIVILEGES ON SCHEMA cdb_crankshaft FROM PUBLIC, publicuser CASCADE;

-- Grant permissions on the schema to publicuser (but just the schema)
GRANT USAGE ON SCHEMA cdb_crankshaft TO publicuser;

-- Revoke execute permissions on all functions in the schema by default
-- REVOKE EXECUTE ON ALL FUNCTIONS IN SCHEMA cdb_crankshaft FROM PUBLIC, publicuser;