#!/usr/bin/env python3
# encoding: utf-8
"""
This script runs a sequence of C++ unit test scenarios.
"""

import argparse, os, subprocess, sys

def get_tests(filename):
    test_list = []
    for line in open(filename, mode="rt"):
        line = line.strip()
        if line == "" or line.startswith("#"):
            continue

        test_list.append(line)
    return test_list

def run_with_rerun_for_sdl_video(executable, test_name):
    """A wrapper for subprocess.run with a workaround for the issue on CI  of intermittently failing to initialise SDL.
    """
    # Sanity check on the number of retries.
    # It's a rare failure, a single retry would probably be enough.
    sdl_retries = 0
    timeout_retries = 0
    while sdl_retries < 10 and timeout_retries < 5:
        sdl_retry = False
        timeout_retry = False

        try:
            res = subprocess.run([executable, "--run_test="+test_name, "--color_output"], timeout=20, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        except subprocess.TimeoutExpired as t:
            timeout_retries += 1
            timeout_retry = True
            print("Test timed out, attempt", timeout_retries)
        else:
            if b"Could not initialize SDL_video" in res.stdout:
                sdl_retries += 1
                sdl_retry = True
                print("Could not initialise SDL_video error, attempt", sdl_retries)

        if not sdl_retry and not timeout_retry:
            return res

if __name__ == '__main__':
    ap = argparse.ArgumentParser()
    ap.add_argument("-e", "--executable", help="The name of the boost unit test executable. Default is boost_unit_tests.", default="boost_unit_tests")
    ap.add_argument("-p", "--path", metavar="dir", help="Path to boost unit test binary. By default assume it is the current directory.", default=".")
    ap.add_argument("-l", "--test_list", metavar="filename", help="Loads the list of tests from the given file. Default is boost_test_schedule.", default="boost_test_schedule")

    options = ap.parse_args()

    tests = get_tests(options.test_list)
    executable = options.executable
    success=0
    failure=0

    for test in tests:
        res = run_with_rerun_for_sdl_video(os.path.join(options.path, executable), test)
        if res.returncode == 0:
            success+=1
            print("Test "+test+" passed")
        else:
            failure+=1
            print("Test "+test+" failed with return code "+str(res.returncode)+":")
            print(res.stdout.decode('utf-8'))
    
    print("Tests passed: "+str(success))
    print("Tests failed: "+str(failure))
    if failure != 0:
        exit(1)