data is dataframe having columns Close, ph, slope_ph and upper

# Initialize variables
data['upos'] = 0

length = 14

# Calculate breakout conditions
for i in range(len(data)):
    
    # Calculate upward breakout condition
    if data.loc[i, 'ph'] and i + length < len(data):  # if ph and not exceeding index limit
        data.loc[i + length, 'upos'] = 0
    elif i > 0:
        if data.loc[i, 'Close'] > data.loc[i, 'upper'] - (data.loc[i, 'slope_ph'] * length):
            data.loc[i, 'upos'] = 1
        else:
            data.loc[i, 'upos'] = data.loc[i - 1, 'upos']

print(data)

I am trying to get results based on below conditions :

1. When ph = True, reset the value of 14th row of upos to 0
2. Else check if Close > upper – slope_ph * length — if yes set value of upos to 1
3. if 2nd point is not true, retain old value of upos

Tried to update the code multiple time, but each time code keeps updating same row of upos to 0 where ph = True

Data_Image