/*
 * Populate the child table(s) of an id-based partition set with old data from the original parent
 */
CREATE FUNCTION partition_data_id(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval int DEFAULT NULL, p_lock_wait numeric DEFAULT 0, p_order text DEFAULT 'ASC') RETURNS bigint
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_control                   text;
v_current_partition_name    text;
v_lock_iter                 int := 1;
v_lock_obtained             boolean := FALSE;
v_max_partition_id          bigint;
v_min_partition_id          bigint;
v_parent_schema             text;
v_parent_tablename          text;
v_partition_interval             bigint;
v_partition_id              bigint[];
v_rowcount                  bigint;
v_sql                       text;
v_start_control             bigint;
v_total_rows                bigint := 0;

BEGIN

SELECT partition_interval::bigint
    , control
INTO v_partition_interval
    , v_control
FROM @extschema@.part_config 
WHERE parent_table = p_parent_table
AND partition_type = 'id';
IF NOT FOUND THEN
    RAISE EXCEPTION 'ERROR: no config found for %', p_parent_table;
END IF;

IF p_batch_interval IS NULL OR p_batch_interval > v_partition_interval THEN
    p_batch_interval := v_partition_interval;
END IF;

FOR i IN 1..p_batch_count LOOP

    IF p_order = 'ASC' THEN
        EXECUTE 'SELECT min('||v_control||') FROM ONLY '||p_parent_table INTO v_start_control;
        IF v_start_control IS NULL THEN
            EXIT;
        END IF;
        v_min_partition_id = v_start_control - (v_start_control % v_partition_interval);
        v_partition_id := ARRAY[v_min_partition_id];
        -- Check if custom batch interval overflows current partition maximum
        IF (v_start_control + p_batch_interval) >= (v_min_partition_id + v_partition_interval) THEN
            v_max_partition_id := v_min_partition_id + v_partition_interval;
        ELSE
            v_max_partition_id := v_start_control + p_batch_interval;
        END IF;

    ELSIF p_order = 'DESC' THEN
        EXECUTE 'SELECT max('||v_control||') FROM ONLY '||p_parent_table INTO v_start_control;
        IF v_start_control IS NULL THEN
            EXIT;
        END IF;
        v_min_partition_id = v_start_control - (v_start_control % v_partition_interval);
        -- Must be greater than max value still in parent table since query below grabs < max
        v_max_partition_id := v_min_partition_id + v_partition_interval;
        v_partition_id := ARRAY[v_min_partition_id];
        -- Make sure minimum doesn't underflow current partition minimum
        IF (v_start_control - p_batch_interval) >= v_min_partition_id THEN
            v_min_partition_id = v_start_control - p_batch_interval;
        END IF;
    ELSE
        RAISE EXCEPTION 'Invalid value for p_order. Must be ASC or DESC';
    END IF;

    -- do some locking with timeout, if required
    IF p_lock_wait > 0  THEN
        v_lock_iter := 0;
        WHILE v_lock_iter <= 5 LOOP
            v_lock_iter := v_lock_iter + 1;
            BEGIN
                v_sql := 'SELECT * FROM ONLY ' || p_parent_table ||
                ' WHERE '||v_control||' >= '||quote_literal(v_min_partition_id)||
                ' AND '||v_control||' < '||quote_literal(v_max_partition_id)
                ||' FOR UPDATE NOWAIT';
                EXECUTE v_sql;
                v_lock_obtained := TRUE;
            EXCEPTION
                WHEN lock_not_available THEN
                    PERFORM pg_sleep( p_lock_wait / 5.0 );
                    CONTINUE;
            END;
            EXIT WHEN v_lock_obtained;
        END LOOP;
        IF NOT v_lock_obtained THEN
           RETURN -1;
        END IF;
    END IF;

    PERFORM @extschema@.create_partition_id(p_parent_table, v_partition_id);
    SELECT schemaname, tablename INTO v_parent_schema, v_parent_tablename FROM pg_catalog.pg_tables WHERE schemaname||'.'||tablename = p_parent_table;
    v_current_partition_name := @extschema@.check_name_length(v_parent_tablename, v_parent_schema, v_min_partition_id::text, TRUE);

    EXECUTE 'WITH partition_data AS (
        DELETE FROM ONLY '||p_parent_table||' WHERE '||v_control||' >= '||v_min_partition_id||
            ' AND '||v_control||' < '||v_max_partition_id||' RETURNING *)
        INSERT INTO '||v_current_partition_name||' SELECT * FROM partition_data';        

    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    v_total_rows := v_total_rows + v_rowcount;
    IF v_rowcount = 0 THEN
        EXIT;
    END IF;

END LOOP;

PERFORM @extschema@.create_function_id(p_parent_table);

RETURN v_total_rows;

END
$$;