#!/usr/bin/python
from __future__ import print_function

from pybin.tools import *
from pybin.test_run import *
from pybin import settings

import argparse
import re
import sys
import time

################################################################################
#               help functions
################################################################################

def findTests():
	expected = []

	def matchTest(path):
		match = re.search("(\.[\w\/\-_]*)\/.expect\/([\w\-_]+)(\.[\w\-_]+)?\.txt", path)
		if match :
			test = Test()
			test.name = match.group(2)
			test.path = match.group(1)
			test.arch = match.group(3)[1:] if match.group(3) else None
			if settings.arch.match(test.arch):
				expected.append(test)

	pathWalk( matchTest )

	return expected

# reads the directory ./.expect and indentifies the tests
def listTests( includes, excludes ):
	includes = [canonicalPath( i ) for i in includes] if includes else None
	excludes = [canonicalPath( i ) for i in excludes] if excludes else None

	# tests directly in the .expect folder will always be processed
	test_list = findTests()

	# if we have a limited number of includes, filter by them
	if includes:
		test_list = [x for x in test_list if
			x.target().startswith( tuple(includes) )
		]

	# # if we have a folders to excludes, filter by them
	if excludes:
		test_list = [x for x in test_list if not
			x.target().startswith( tuple(excludes) )
		]

	return test_list

# from the found tests, filter all the valid tests/desired tests
def validTests( options ):
	tests = []

	# if we are regenerating the tests we need to find the information of the
	# already existing tests and create new info for the new tests
	if options.regenerate_expected :
		for testname in options.tests :
			testname = canonicalPath( testname )
			if Test.valid_name(testname):
				found = [test for test in allTests if test.target() == testname]
				tests.append( found[0] if len(found) == 1 else Test.from_target(testname) )
			else :
				print('ERROR: "%s", tests are not allowed to end with a C/C++/CFA extension, ignoring it' % testname, file=sys.stderr)

	else :
		# otherwise we only need to validate that all tests are present in the complete list
		for testname in options.tests:
			test = [t for t in allTests if pathCmp( t.target(), testname )]

			if test :
				tests.append( test[0] )
			else :
				print('ERROR: No expected file for test %s, ignoring it' % testname, file=sys.stderr)

	# make sure we have at least some test to run
	if not tests :
		print('ERROR: No valid test to run', file=sys.stderr)
		sys.exit(1)

	return tests

# parses the option
def getOptions():
	# create a parser with the arguments for the tests script
	parser = argparse.ArgumentParser(description='Script which runs cforall tests')
	parser.add_argument('--debug', help='Run all tests in debug or release', type=yes_no, default='no')
	parser.add_argument('--arch', help='Test for specific architecture', type=str, default='')
	parser.add_argument('--dry-run', help='Don\'t run the tests, only output the commands', action='store_true')
	parser.add_argument('--list', help='List all test available', action='store_true')
	parser.add_argument('--all', help='Run all test available', action='store_true')
	parser.add_argument('--regenerate-expected', help='Regenerate the .expect by running the specified tets, can be used with --all option', action='store_true')
	parser.add_argument('-j', '--jobs', help='Number of tests to run simultaneously', type=int, default='8')
	parser.add_argument('--list-comp', help='List all valide arguments', action='store_true')
	parser.add_argument('-I','--include', help='Directory of test to include, can be used multiple time, All  if omitted', action='append')
	parser.add_argument('-E','--exclude', help='Directory of test to exclude, can be used multiple time, None if omitted', action='append')
	parser.add_argument('tests', metavar='test', type=str, nargs='*', help='a list of tests to run')

	options =  parser.parse_args()

	# script must have at least some tests to run or be listing
	listing    = options.list or options.list_comp
	all_tests  = options.all
	some_tests = len(options.tests) > 0
	some_dirs  = len(options.include) > 0 if options.include else 0

	# check that exactly one of the booleans is set to true
	if not sum( (listing, all_tests, some_tests, some_dirs) ) > 0 :
		print('ERROR: must have option \'--all\', \'--list\', \'--include\', \'-I\' or non-empty test list', file=sys.stderr)
		parser.print_help()
		sys.exit(1)

	return options

################################################################################
#               running test functions
################################################################################
# logic to run a single test and return the result (No handling of printing or other test framework logic)
def run_single_test(test):

	# find the output file based on the test name and options flag
	out_file = test.target_output()
	err_file = test.error_log()
	cmp_file = test.expect()
	in_file  = test.input()

	# prepare the proper directories
	test.prepare()

	# remove any outputs from the previous tests to prevent side effects
	rm( (out_file, err_file, test.target()) )

	# build, skipping to next test on error
	before = time.time()
	make_ret, _ = make( test.target(),
		redirects  = "2> %s 1> /dev/null" % out_file,
		error_file = err_file
	)
	after = time.time()

	comp_dur = after - before

	run_dur = None

	# if the make command succeds continue otherwise skip to diff
	if make_ret == 0 or settings.dry_run:
		before = time.time()
		if settings.dry_run or fileIsExecutable(test.target()) :
			# run test
			retcode, _ = sh("timeout 60 %s > %s 2>&1" % (test.target(), out_file), input = in_file)
		else :
			# simply cat the result into the output
			retcode, _ = sh("cat %s > %s" % (test.target(), out_file))

		after = time.time()
		run_dur = after - before
	else:
		retcode, _ = sh("mv %s %s" % (err_file, out_file))


	if retcode == 0:
		if settings.generating :
			# if we are ounly generating the output we still need to check that the test actually exists
			if not settings.dry_run and fileContainsOnly(out_file, "make: *** No rule to make target `%s'.  Stop." % test.target()) :
				retcode = 1;
				error = "\t\tNo make target for test %s!" % test.target()
				sh("rm %s" % out_file, False)
			else:
				error = None
		else :
			# fetch return code and error from the diff command
			retcode, error = diff(cmp_file, out_file)

	else:
		with open (out_file, "r") as myfile:
			error = myfile.read()


	# clean the executable
	sh("rm -f %s > /dev/null 2>&1" % test.target())

	return retcode, error, [comp_dur, run_dur]

# run a single test and handle the errors, outputs, printing, exception handling, etc.
def run_test_worker(t) :

	with SignalHandling():
		# print formated name
		name_txt = "%20s  " % t.name

		retcode, error, duration = run_single_test(t)

		# update output based on current action
		result_txt = TestResult.toString( retcode, duration )

		#print result with error if needed
		text = name_txt + result_txt
		out = sys.stdout
		if error :
			text = text + "\n" + error
			out = sys.stderr

		print(text, file = out)
		sys.stdout.flush()
		sys.stderr.flush()

	return retcode != TestResult.SUCCESS

# run the given list of tests with the given parameters
def run_tests(tests, jobs) :
	# clean the sandbox from previous commands
	make('clean', redirects = '> /dev/null 2>&1')

	# create the executor for our jobs and handle the signal properly
	pool = setupPool(jobs)

	# for each test to run
	try :
		results = pool.map_async(
			run_test_worker,
			tests,
			chunksize = 1
		).get(7200)
	except KeyboardInterrupt:
		pool.terminate()
		print("Tests interrupted by user")
		sys.exit(1)

	# clean the workspace
	make('clean', redirects = '> /dev/null 2>&1')

	for failed in results:
		if failed :
			return 1

	return 0


################################################################################
#               main loop
################################################################################
if __name__ == "__main__":
	#always run from same folder
	chdir()

	# parse the command line arguments
	options = getOptions()

	# init global settings
	settings.init( options )

	# fetch the liest of all valid tests
	allTests = listTests( options.include, options.exclude )

	# if user wants all tests than no other treatement of the test list is required
	if options.all or options.list or options.list_comp or options.include :
		tests = allTests

	#otherwise we need to validate that the test list that was entered is valid
	else :
		tests = validTests( options )

	# sort the test alphabetically for convenience
	tests.sort(key=lambda t: (t.arch if t.arch else '') + t.target())

	# users may want to simply list the tests
	if options.list_comp :
		print("-h --help --debug --dry-run --list --arch --all --regenerate-expected -j --jobs ", end='')
		print(" ".join(map(lambda t: "%s" % (t.target()), tests)))

	elif options.list :
		print("Listing for %s:%s"% (settings.arch.string, settings.debug.string))
		print("\n".join(map(lambda t: "%s" % (t.toString()), tests)))

	else :
		options.jobs, forceJobs = jobCount( options, tests )
		settings.updateMakeCmd(forceJobs, options.jobs)

		print('%s (%s:%s) on %i cores' % (
			'Regenerate tests' if settings.generating else 'Running',
			settings.arch.string,
			settings.debug.string,
			options.jobs
		))

		# otherwise run all tests and make sure to return the correct error code
		sys.exit( run_tests(tests, options.jobs) )