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CREATE OR ALTER PROCEDURE PSESSIONS_EDIT (
    VIN_ACT SMALLINT NOT NULL,
    VIN_SESSION INTEGER,
    VIN_CASHDESK INTEGER NOT NULL,
    VIN_USER SMALLINT NOT NULL,
    VIN_ACTUAL DECIMAL(15,2),
    VIN_COMMENT VARCHAR(150))
RETURNS (
    VID INTEGER,
    VUUID VARCHAR(36),
    VOPENED TIMESTAMP,
    VCLOSED TIMESTAMP)
AS
DECLARE VARIABLE VMY_AUTOACTUAL DECIMAL(15,2);
BEGIN
    IF (:VIN_ACT = 0) THEN
     /* ОТКРЫТЬ СМЕНУ */
    BEGIN
        SELECT FIRST 1 FID, FUUID, FOPENED, FCLOSED
            FROM TSESSIONS
            WHERE FCASHDESK = :VIN_CASHDESK
            ORDER BY FID DESC
        INTO :VID, :VUUID, :VOPENED, :VCLOSED;

        IF (:VOPENED IS NOT NULL AND :VCLOSED IS NULL) THEN
            EXCEPTION ESESSION_ALREADY_OPEN;
        
        /* Открытие */
        VID = COALESCE((SELECT FIRST 1 FID FROM TSESSIONS ORDER BY FID DESC), 0) + 1;
        VUUID = LOWER(UUID_TO_CHAR(GEN_UUID()));
        INSERT INTO TSESSIONS (FID, FUUID, FCASHDESK, FOPENED, FUSER)
            VALUES (:VID, :VUUID, :VIN_CASHDESK, CURRENT_TIMESTAMP, :VIN_USER);
    END ELSE
    /* ЗАКРЫТЬ СМЕНУ */
    BEGIN
        VID = :VIN_SESSION;
        VUUID = (SELECT FIRST 1 FUUID FROM TSESSIONS WHERE FID = :VIN_SESSION);
        UPDATE TSESSIONS SET
            FCLOSED = CURRENT_TIMESTAMP,
            FACTUAL = :VIN_ACTUAL,
            FCOMMENT = :VIN_COMMENT
        WHERE FID = :VIN_SESSION AND FCASHDESK = :VIN_CASHDESK;
    END
    SUSPEND;
END