import argparse, json

parser = argparse.ArgumentParser(description="Calculate diff between holder lists")
parser.add_argument('-a', '--a', help="First json file")
parser.add_argument('-b', '--b', help="Second json file")
parser.add_argument('-o', '--output', help="Output json file")
args = parser.parse_args()

with open(args.a) as f:
    a_data = json.load(f)
    a = {k.lower(): v for k, v in a_data.items()}

with open(args.b) as f:
    b_data = json.load(f)
    b = {k.lower(): v for k, v in b_data.items()}


different_values = {}
only_in_a = {}
for key in a:
    if key in b:
        if a[key] != b[key]:
            different_values[key] = {
                "a": a[key], 
                "b": b[key]
            }
    else:
        only_in_a[key] = a[key]
        continue

only_in_b = {}
for key in b:
    if key not in b:
        only_in_b[key] = b[key]

print('Only in A:', len(only_in_a))
print('Only in B:', len(only_in_b))

with open(args.output, 'w') as f:
    json.dump({
        "only_in_a": only_in_a,
        "only_in_b": only_in_b,
        "different_value": different_values
    }, f, indent=2)