-- etldoc: ne_110m_admin_0_boundary_lines_land  -> boundary_z0

CREATE OR REPLACE VIEW boundary_z0 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_110m_admin_0_boundary_lines_land
);

-- etldoc: ne_50m_admin_0_boundary_lines_land  -> boundary_z1
-- etldoc: ne_50m_admin_1_states_provinces_lines -> boundary_z1

CREATE OR REPLACE VIEW boundary_z1 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_50m_admin_0_boundary_lines_land
    UNION ALL
    SELECT geom, 4 AS admin_level
    FROM ne_50m_admin_1_states_provinces_lines
    WHERE scalerank <= 2
);


-- etldoc: ne_50m_admin_0_boundary_lines_land -> boundary_z3
-- etldoc: ne_50m_admin_1_states_provinces_lines -> boundary_z3

CREATE OR REPLACE VIEW boundary_z3 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_50m_admin_0_boundary_lines_land
    UNION ALL
    SELECT geom, 4 AS admin_level
    FROM ne_50m_admin_1_states_provinces_lines
);


-- etldoc: ne_10m_admin_0_boundary_lines_land -> boundary_z4
-- etldoc: ne_10m_admin_1_states_provinces_lines_shp -> boundary_z4

CREATE OR REPLACE VIEW boundary_z4 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_10m_admin_0_boundary_lines_land
    UNION ALL
    SELECT geom, 4 AS admin_level
    FROM ne_10m_admin_1_states_provinces_lines_shp
    WHERE scalerank <= 3 AND featurecla = 'Adm-1 boundary'
);

-- etldoc: ne_10m_admin_0_boundary_lines_land -> boundary_z5
-- etldoc: ne_10m_admin_1_states_provinces_lines_shp -> boundary_z5

CREATE OR REPLACE VIEW boundary_z5 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_10m_admin_0_boundary_lines_land
    UNION ALL
    SELECT geom, 4 AS admin_level
    FROM ne_10m_admin_1_states_provinces_lines_shp
    WHERE scalerank <= 7 AND featurecla = 'Adm-1 boundary'
);

-- etldoc: ne_10m_admin_0_boundary_lines_land -> boundary_z6
-- etldoc: ne_10m_admin_1_states_provinces_lines_shp -> boundary_z6

CREATE OR REPLACE VIEW boundary_z6 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_10m_admin_0_boundary_lines_land
    UNION ALL
    SELECT geom, 4 AS admin_level
    FROM ne_10m_admin_1_states_provinces_lines_shp
    WHERE scalerank <= 9 AND featurecla = 'Adm-1 boundary'
);

-- etldoc: ne_10m_admin_0_boundary_lines_land -> boundary_z7
-- etldoc: ne_10m_admin_1_states_provinces_lines_shp -> boundary_z7
CREATE OR REPLACE VIEW boundary_z7 AS (
    SELECT geom, 2 AS admin_level
    FROM ne_10m_admin_0_boundary_lines_land
    UNION ALL
    SELECT geom, 4 AS admin_level
    FROM ne_10m_admin_1_states_provinces_lines_shp
    WHERE featurecla = 'Adm-1 boundary'

);

-- etldoc: osm_boundary_linestring_gen5 -> boundary_z8
CREATE OR REPLACE VIEW boundary_z8 AS (
    SELECT geometry AS geom, admin_level
    FROM osm_boundary_linestring_gen5
    WHERE admin_level <= 4 AND ST_Length(geometry) > 1000
);

-- etldoc: osm_boundary_linestring_gen4 -> boundary_z9
CREATE OR REPLACE VIEW boundary_z9 AS (
    SELECT geometry AS geom, admin_level
    FROM osm_boundary_linestring_gen4
    WHERE admin_level <= 6
);

-- etldoc: osm_boundary_linestring_gen3 -> boundary_z10
CREATE OR REPLACE VIEW boundary_z10 AS (
    SELECT geometry AS geom, admin_level
    FROM osm_boundary_linestring_gen3
    WHERE admin_level <= 6
);

-- etldoc: osm_boundary_linestring_gen2 -> boundary_z11
CREATE OR REPLACE VIEW boundary_z11 AS (
    SELECT geometry AS geom, admin_level
    FROM osm_boundary_linestring_gen2
    WHERE admin_level <= 8
);

-- etldoc: osm_boundary_linestring_gen1 -> boundary_z12
CREATE OR REPLACE VIEW boundary_z12 AS (
    SELECT geometry AS geom, admin_level
    FROM osm_boundary_linestring_gen1
);

-- etldoc: layer_boundary[shape=record fillcolor=lightpink, style="rounded,filled",
-- etldoc:     label="<sql> layer_boundary |<z0> z0 |<z1_2> z1_2 | <z3> z3 | <z4> z4 | <z5> z5 || <z6> z6 || <z7> z7 | <z8> z8 | <z9> z9    |<z10> z10 |<z11> z11 |<z12> z12|<z13> z13+"]

CREATE OR REPLACE FUNCTION layer_boundary (bbox geometry, zoom_level int)
RETURNS TABLE(geometry geometry, admin_level int) AS $$
    SELECT geom, admin_level FROM (
        -- etldoc: boundary_z0 ->  layer_boundary:z0
        SELECT * FROM boundary_z0 WHERE geom && bbox AND zoom_level = 0
        UNION ALL
        -- etldoc: boundary_z1 ->  layer_boundary:z1_2
        SELECT * FROM boundary_z1 WHERE geom && bbox AND zoom_level BETWEEN 1 AND 2
        UNION ALL
        -- etldoc: boundary_z3 ->  layer_boundary:z3
        SELECT * FROM boundary_z3 WHERE geom && bbox AND zoom_level = 3
        UNION ALL
        -- etldoc: boundary_z4 ->  layer_boundary:z4
        SELECT * FROM boundary_z4 WHERE geom && bbox AND zoom_level = 4
        UNION ALL
        -- etldoc: boundary_z5 ->  layer_boundary:z5
        SELECT * FROM boundary_z5 WHERE geom && bbox AND zoom_level = 5
        UNION ALL
        -- etldoc: boundary_z6 ->  layer_boundary:z6
        SELECT * FROM boundary_z6 WHERE geom && bbox AND zoom_level = 6
        UNION ALL
        -- etldoc: boundary_z7 ->  layer_boundary:z7
        SELECT * FROM boundary_z7 WHERE geom && bbox AND zoom_level = 7
        UNION ALL
        -- etldoc: boundary_z8 ->  layer_boundary:z8
        SELECT * FROM boundary_z8 WHERE geom && bbox AND zoom_level = 8
        UNION ALL
        -- etldoc: boundary_z9 ->  layer_boundary:z9
        SELECT * FROM boundary_z9 WHERE geom && bbox AND zoom_level = 9
        UNION ALL
        -- etldoc: boundary_z10 ->  layer_boundary:z10
        SELECT * FROM boundary_z10 WHERE geom && bbox AND zoom_level = 10
        UNION ALL
        -- etldoc: boundary_z11 ->  layer_boundary:z11
        SELECT * FROM boundary_z11 WHERE geom && bbox AND zoom_level = 11
        UNION ALL
        -- etldoc: boundary_z12 ->  layer_boundary:z12
        SELECT * FROM boundary_z12 WHERE geom && bbox AND zoom_level = 12
        UNION ALL
        -- etldoc: boundary_z12 -> layer_boundary:z13
        SELECT * FROM boundary_z12 WHERE geom && bbox AND zoom_level >= 13
    ) AS zoom_levels;
$$ LANGUAGE SQL IMMUTABLE;