#!/usr/bin/env python3

import sys, os, subprocess, tempfile, threading


def which (program):
	# https://stackoverflow.com/a/377028
	def is_exe (fpath):
		return os.path.isfile (fpath) and os.access (fpath, os.X_OK)

	fpath, _ = os.path.split (program)
	if fpath:
		if is_exe (program):
			return program
	else:
		for path in os.environ["PATH"].split (os.pathsep):
			exe_file = os.path.join (path, program)
			if is_exe (exe_file):
				return exe_file

	return None


def cmd (command):
	# https://stackoverflow.com/a/4408409
	# https://stackoverflow.com/a/10012262
	with tempfile.TemporaryFile () as tempf:
		p = subprocess.Popen (command, stderr=tempf)
		is_killed = {'value': False}

		def timeout (p, is_killed):
			is_killed['value'] = True
			p.kill ()
		timeout_seconds = int (os.environ.get ("HB_TEST_SHAPE_FUZZER_TIMEOUT", "2"))
		timer = threading.Timer (timeout_seconds, timeout, [p, is_killed])

		try:
			timer.start()
			p.wait ()
			tempf.seek (0)
			text = tempf.read ()

			#TODO: Detect debug mode with a better way
			is_debug_mode = b"SANITIZE" in text

			text = "" if is_debug_mode else text.decode ("utf-8").strip ()
			returncode = p.returncode
		finally:
			timer.cancel()

		if is_killed['value']:
			text = 'error: timeout, ' + text
			returncode = 1

		return text, returncode


srcdir = os.environ.get ("srcdir", ".")
EXEEXT = os.environ.get ("EXEEXT", "")
top_builddir = os.environ.get ("top_builddir", ".")
hb_shape_fuzzer = os.path.join (top_builddir, "hb-shape-fuzzer" + EXEEXT)

if not os.path.exists (hb_shape_fuzzer):
	if len (sys.argv) == 1 or not os.path.exists (sys.argv[1]):
		print ("""Failed to find hb-shape-fuzzer binary automatically,
please provide it as the first argument to the tool""")
		sys.exit (1)

	hb_shape_fuzzer = sys.argv[1]

print ('hb_shape_fuzzer:', hb_shape_fuzzer)
fails = 0

libtool = os.environ.get ('LIBTOOL')
valgrind = None
if os.environ.get ('RUN_VALGRIND', ''):
	valgrind = which ('valgrind')
	if valgrind is None:
		print ("""Valgrind requested but not found.""")
		sys.exit (1)
	if libtool is None:
		print ("""Valgrind support is currently autotools only and needs libtool but not found.""")


parent_path = os.path.join (srcdir, "fonts")
for file in os.listdir (parent_path):
	path = os.path.join (parent_path, file)

	if valgrind:
		text, returncode = cmd (libtool.split(' ') + ['--mode=execute', valgrind + ' --leak-check=full --error-exitcode=1', '--', hb_shape_fuzzer, path])
	else:
		text, returncode = cmd ([hb_shape_fuzzer, path])
		if 'error' in text:
			returncode = 1

	if (not valgrind or returncode) and text.strip ():
		print (text)

	if returncode != 0:
		print ('failure on %s' % file)
		fails = fails + 1


if fails:
	print ("%i shape fuzzer related tests failed." % fails)
	sys.exit (1)