-- MBTiles schema

BEGIN;

CREATE TABLE IF NOT EXISTS map (
   zoom_level INTEGER,
   tile_column INTEGER,
   tile_row INTEGER,
   tile_id TEXT,
   grid_id TEXT
);

CREATE TABLE IF NOT EXISTS grid_key (
    grid_id TEXT,
    key_name TEXT
);

CREATE TABLE IF NOT EXISTS keymap (
    key_name TEXT,
    key_json TEXT
);

CREATE TABLE IF NOT EXISTS grid_utfgrid (
    grid_id TEXT,
    grid_utfgrid BLOB
);

CREATE TABLE IF NOT EXISTS images (
    tile_data blob,
    tile_id text
);

CREATE TABLE IF NOT EXISTS metadata (
    name text,
    value text
);


CREATE UNIQUE INDEX IF NOT EXISTS map_index ON map (zoom_level, tile_column, tile_row);
CREATE UNIQUE INDEX IF NOT EXISTS grid_key_lookup ON grid_key (grid_id, key_name);
CREATE UNIQUE INDEX IF NOT EXISTS keymap_lookup ON keymap (key_name);
CREATE UNIQUE INDEX IF NOT EXISTS grid_utfgrid_lookup ON grid_utfgrid (grid_id);
CREATE UNIQUE INDEX IF NOT EXISTS images_id ON images (tile_id);
CREATE UNIQUE INDEX IF NOT EXISTS name ON metadata (name);


CREATE VIEW IF NOT EXISTS tiles AS
    SELECT
        map.zoom_level AS zoom_level,
        map.tile_column AS tile_column,
        map.tile_row AS tile_row,
        images.tile_data AS tile_data
    FROM map
    JOIN images ON images.tile_id = map.tile_id;

CREATE VIEW IF NOT EXISTS grids AS
    SELECT
        map.zoom_level AS zoom_level,
        map.tile_column AS tile_column,
        map.tile_row AS tile_row,
        grid_utfgrid.grid_utfgrid AS grid
    FROM map
    JOIN grid_utfgrid ON grid_utfgrid.grid_id = map.grid_id;

CREATE VIEW IF NOT EXISTS grid_data AS
    SELECT
        map.zoom_level AS zoom_level,
        map.tile_column AS tile_column,
        map.tile_row AS tile_row,
        keymap.key_name AS key_name,
        keymap.key_json AS key_json
    FROM map
    JOIN grid_key ON map.grid_id = grid_key.grid_id
    JOIN keymap ON grid_key.key_name = keymap.key_name;

COMMIT;
