#!/usr/bin/env python

import difflib
import email.parser
import mailbox
import sys

f1, f2 = sys.argv[1:3]

expected = email.parser.Parser().parse(open(f1))

mbox = mailbox.mbox(f2, create=False)
msg = mbox[0]

diff = False

for h, val in expected.items():
	if h not in msg:
		print("Header missing: %r" % h)
		diff = True
		continue

	if expected[h] == '*':
		continue

	if msg[h] != val:
		print("Header %r differs: %r != %r" % (h, val, msg[h]))
		diff = True


def flexible_eq(expected, got):
    """Compare two strings, supporting wildcards.

    This functions compares two strings, but supports wildcards on the
    expected string. The following characters have special meaning:

     - ?  matches any character.
     - *  matches anything until the end of the line.

    Returns True if equal (considering wildcards), False otherwise.
    """
    posG = 0
    for c in expected:
        if posG >= len(got):
            return False

        if c == '?':
            posG += 1
            continue
        if c == '*':
            while got[posG] != '\n':
                posG += 1
                continue
            continue

        if c != got[posG]:
            return False

        posG += 1

    return True


if not flexible_eq(expected.get_payload(), msg.get_payload()):
	diff = True

	if expected.is_multipart() != msg.is_multipart():
		print("Multipart differs, expected %s, got %s" % (
			expected.is_multipart(), msg.is_multipart()))
	elif not msg.is_multipart():
		exp = expected.get_payload().splitlines()
		got = msg.get_payload().splitlines()
		print("Payload differs:")
		for l in difflib.ndiff(exp, got):
			print(l)

sys.exit(0 if not diff else 1)