If record exist update partlevel from 1 to 0?

problem

if record exist on trade code table update partlevel from 1 to 0 ?

the code below insert new record on trade code for codetypeto and codevalueto if not exist on table tradecode

i need to modify code below if codevalueto and code typeto both exist on table tradecode

then update partlevel from 1 to 0 to codetypeto and codevalueto on tradecode table that already exist

else

insert record on tradecode table to codetypeto and codevalueto that not exist

create table #MappingCodeValue
(
id int identity (1,1),
CodeTypeFrom nvarchar(50),
CodeValueFrom nvarchar(50),
CodeTypeTo nvarchar(50),
CodeValueTo nvarchar(50)
)
INSERT INTO #MappingCodeValue
(CodeTypeFrom,CodeValueFrom,CodeTypeTo,CodeValueTo)
VALUES
('ECCS-US','AB123-US','ECCS-URB','AB123-URB'),
('ECCS-US','AB555-US','ECCS-URB','AB555-URB'),
('ECCS-US','AB666-US','ECCS-URB','AB666-URB'),
('ECCS-US','AB756-US','ECCS-URB','AB778-URB')
CREATE TABLE #TradeCode
(
TradeCodeId int identity(1,1),
PartId int,
Partlevel int,
CodeType nvarchar(50),
CodeValue nvarchar(50)
)
insert into #TradeCode(PartId,Partlevel,CodeType,CodeValue)VALUES
(1222,1,'ECCS-US','AB123-US'),
(1255,1,'ECCS-US','AB555-US'),
(1444,1,'ECCS-US','AB666-US'),
(1931,1,'ECCS-US','AB756-US')
insert into #TradeCode
select c.PartId, c.Partlevel, c.CodeType, m.CodeValueTo
from #MappingCodeValue as m
inner join #TradeCode as c on c.CodeType = m.CodeTypeFrom and c.CodeValue = m.CodeValueFrom
where not exists( select * from #TradeCode where CodeType = c.CodeType and CodeValue = m.CodeValueTo)
Select * from #TradeCode

Expected Result

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