Is there if-like Conditional Structure in SQLite (different statement in different cases)?

Is there any if-like structure in SQLite? In the below code, I tried to Insert if it is exists, or update the value if it does, but neither works:

SELECT CASE EXISTS(SELECT BuildingType FROM Building_GreatPersonPoints WHERE BuildingType = 'BUILDING_OP_BUILDING' AND GreatPersonClassType='GREAT_PERSON_CLASS_PROPHET')
    WHEN 0 THEN
        INSERT INTO Building_GreatPersonPoints(BuildingType, GreatPersonClassType, PointsPerTurn) VALUES('BUILDING_OP_BUILDING', 'GREAT_PERSON_CLASS_PROPHET', 3)
    WHEN 1 THEN
        UPDATE Building_GreatPersonPoints SET PointsPerTurn = 3 WHERE BuildingType='BUILDING_OP_BUILDING' AND  GreatPersonClassType='GREAT_PERSON_CLASS_PROPHET';

Error

near "INSERT": syntax error: SELECT CASE EXISTS(SELECT BuildingType FROM Building_GreatPersonPoints WHERE BuildingType = 'BUILDING_OP_BUILDING' AND GreatPersonClassType='GREAT_PERSON_CLASS_PROPHET') WHEN 0 THEN INSERT

INSERT INTO Building_GreatPersonPoints(BuildingType, GreatPersonClassType, PointsPerTurn) VALUES('BUILDING_OP_BUILDING', 'GREAT_PERSON_CLASS_PROPHET', 3)
WHEN NOT EXIST(SELECT * FROM Building_GreatPersonPoints WHERE BuildingType = 'BUILDING_OP_BUILDING' AND GreatPersonClassType='GREAT_PERSON_CLASS_PROPHET');

UPDATE Building_GreatPersonPoints SET PointsPerTurn = 3 WHERE BuildingType='BUILDING_OP_BUILDING' AND  GreatPersonClassType='GREAT_PERSON_CLASS_PROPHET';

Error

near "WHEN": syntax error: INSERT INTO Building_GreatPersonPoints(BuildingType, GreatPersonClassType, PointsPerTurn) VALUES('BUILDING_OP_BUILDING', 'GREAT_PERSON_CLASS_PROPHET', 3) WHEN

Please tell me the problem and how should I solve it? If possible, please tell me the generic conditional structure (for example, do A and B and C if true, do C and D if false).