import sys
import csv
import math

if len(sys.argv) < 3:
  sys.exit('Use it like: python verify.py reference.csv generated.csv [tol]')

TOL = float(sys.argv[3]) if len(sys.argv) > 3 else 1
DIFF_COL_RATIO_THRESHOLD = 0.025

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]
diff_col_count = 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
    if TOL > 0:
      try:
        if math.isclose(float(a), float(b), abs_tol=TOL):
          continue
        else:
          diff_col_count += 1
      except ValueError:
        pass

if diff_col_count / len(ref) > DIFF_COL_RATIO_THRESHOLD:
  sys.exit(f'Error Threshold Exceeded!')