/*
 *  Inserter maker function. 
 */
CREATE FUNCTION inserter_maker(
    p_src_table text
    , p_control_field text
    , p_dblink_id int
    , p_boundary interval DEFAULT '00:10:00'
    , p_dest_table text DEFAULT NULL
    , p_index boolean DEFAULT true
    , p_filter text[] DEFAULT NULL
    , p_condition text DEFAULT NULL
    , p_pulldata boolean DEFAULT true
    , p_debug boolean DEFAULT false) 
RETURNS void
    LANGUAGE plpgsql
    AS $$
DECLARE

v_data_source               text;
v_dest_schema_name          text;
v_dest_table_name           text;
v_dst_active                boolean;
v_insert_refresh_config     text;
v_max_timestamp             timestamptz;
v_table_exists              boolean;

BEGIN

SELECT data_source INTO v_data_source FROM @extschema@.dblink_mapping WHERE data_source_id = p_dblink_id; 
IF NOT FOUND THEN
	RAISE EXCEPTION 'ERROR: database link ID is incorrect %', p_dblink_id; 
END IF;  

IF p_dest_table IS NULL THEN
    p_dest_table := p_src_table;
END IF;

IF position('.' in p_dest_table) > 0 AND position('.' in p_src_table) > 0 THEN
    v_dest_schema_name := split_part(p_dest_table, '.', 1); 
    v_dest_table_name := split_part(p_dest_table, '.', 2);
ELSE
    RAISE EXCEPTION 'Source (and destination) table must be schema qualified';
END IF;

v_dst_active := @extschema@.dst_utc_check();

v_insert_refresh_config := 'INSERT INTO @extschema@.refresh_config_inserter(source_table, dest_table, dblink, control, boundary, last_value, last_run, dst_active, filter, condition) VALUES('
    ||quote_literal(p_src_table)||','||quote_literal(p_dest_table)||','|| p_dblink_id||','||quote_literal(p_control_field)||','
    ||quote_literal(p_boundary)||',''0001-01-01''::date,'||quote_literal(CURRENT_TIMESTAMP)||','||v_dst_active||','
    ||COALESCE(quote_literal(p_filter), 'NULL')||','||COALESCE(quote_literal(p_condition), 'NULL')||');';

PERFORM @extschema@.gdb(p_debug, 'v_insert_refresh_config: '||v_insert_refresh_config);
EXECUTE v_insert_refresh_config;

SELECT p_table_exists FROM @extschema@.manage_dest_table(p_dest_table, NULL, p_debug) INTO v_table_exists;

IF p_pulldata AND v_table_exists = false THEN
    RAISE NOTICE 'Pulling all data from source...';
    EXECUTE 'SELECT @extschema@.refresh_inserter('||quote_literal(p_dest_table)||', p_repull := true, p_debug := '||p_debug||')';
END IF;

IF p_index AND v_table_exists = false THEN
    PERFORM @extschema@.create_index(p_dest_table, NULL, p_debug);
END IF;

IF v_table_exists THEN
    RAISE NOTICE 'Destination table % already exists. No data or indexes were pulled from source', p_dest_table;
END IF;

RAISE NOTICE 'Getting the maximum destination timestamp...';
EXECUTE 'SELECT max('||p_control_field||') FROM '||p_dest_table||';' INTO v_max_timestamp;

EXECUTE 'UPDATE @extschema@.refresh_config_inserter SET last_value = '||quote_literal(COALESCE(v_max_timestamp, CURRENT_TIMESTAMP))||' WHERE dest_table = '||quote_literal(p_dest_table);

RAISE NOTICE 'Done';
END
$$;

