drop table m_loan_transaction_temp;

/**Temp table with primary key and indices**/
CREATE TABLE `m_loan_transaction_temp` (
	`id` BIGINT(20) NOT NULL,
	`loan_id` BIGINT(20) NOT NULL,
	`amount` DECIMAL(19,6) NOT NULL DEFAULT '0.000000',
	`transaction_date` DATE NOT NULL,
	PRIMARY KEY (`id`),
	INDEX `loan_id` (`loan_id`),
	INDEX `transaction_date` (`transaction_date`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;

/**Copy data to temp table, skip accrual transaction, greatly reduces table size**/
INSERT INTO m_loan_transaction_temp(`id`,`loan_id`,`transaction_date`,`amount`)
select lt.id, lt.loan_id,lt.transaction_date,if(lt.transaction_type_enum = 1 , IFNULL(lt.amount,0),IFNULL(-lt.principal_portion_derived,0)) from m_loan_transaction lt where lt.is_reversed=0 and lt.transaction_type_enum <> 10;


/**Drop stored procedure**/
drop procedure update_running_balance;


/**Update Balance for 500 records at a time using store procedure**/
DELIMITER //

CREATE PROCEDURE `update_running_balance` ()
LANGUAGE SQL
DETERMINISTIC
SQL SECURITY DEFINER
COMMENT 'Update Running Balances for Loans'
BEGIN

DECLARE max_transaction INT DEFAULT 0;
DECLARE i INT DEFAULT 0;
DECLARE n INT DEFAULT 0;
DECLARE page_size INT DEFAULT 500;

select max(id) into max_transaction from m_loan_transaction;


SET i = 0;

theLoop:LOOP
SET n = i + page_size;


	IF i < max_transaction THEN

	START TRANSACTION;

	  UPDATE m_loan_transaction lt SET lt.outstanding_loan_balance_derived = (select sum(ltt.amount) from m_loan_transaction_temp ltt where ((ltt.transaction_date = lt.transaction_date and ltt.id  <= lt.id) or ltt.transaction_date < lt.transaction_date) and ltt.loan_id = lt.loan_id) where lt.transaction_type_enum != 10 and lt.is_reversed = 0 and lt.id BETWEEN i AND n;
	  SET i = i + page_size;

	COMMIT;

	  ITERATE theLoop;


	END IF;

	LEAVE theLoop;
END LOOP theLoop;

END//

/**Call stored procedure**/
call update_running_balance();

/**Drop stored procedure**/
drop procedure update_running_balance;