import sys
import csv
import math

if len(sys.argv) < 3:
    sys.exit("Use it like: python verify.py reference.csv generated.csv [tol]")
# We can use this later in case that we wanna compare something with a tolerance
tol = float(sys.argv[3]) if len(sys.argv) > 3 else 0.00001

with open(sys.argv[1], newline="") as f:
    ref = list(csv.reader(f))
with open(sys.argv[2], newline="") as f:
    gen = list(csv.reader(f))

if len(ref) != len(gen):
    sys.exit(f"row count differs: ref={len(ref)} got={len(gen)}")

header = ref[0]
for i in range(len(ref)):
    if len(ref[i]) != len(gen[i]):
        sys.exit(f"line {i+1}: column count differs")
    for j in range(len(ref[i])):
        a = ref[i][j].strip()
        b = gen[i][j].strip()
        if a == b:
            continue
        # in case that we wanna use tolerance
        if tol > 0:
            try:
                if math.isclose(float(a), float(b), abs_tol=tol):
                    continue
            except ValueError:
                pass
        col = header[j] if j < len(header) else f"col{j}"
        sys.exit(f"mismatch at line {i+1}, col {j} ('{col}'): ref='{a}' got='{b}'")