#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Description: Script to run unit tests.
# Author: Francisco José Madrid Cuevas <fjmadrid@uco.es>
# Date: 2025-01-29
#
# CHANGELOG:
# 1.0.0
# - Initial version.
# 1.1.0
# - Improved exception handling in subprocess call.
# - Added version argument to display script version.
# - Added timeout argument to control test execution time.
#


import sys
import os
import subprocess
import glob
import argparse

__version__ = "1.1.0"


def is_executable(file_path):
    if os.name == "nt":
        file_path += ".exe"
    return os.path.isfile(file_path) and os.access(file_path, os.X_OK)


def is_directory(file_path):
    return os.path.isdir(file_path)


def is_file(file_path):
    return os.path.isfile(file_path)


def eprint(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description=f'Run unit tests ({__version__})')
    parser.add_argument('--version', '-v', action='version',
                        version=f'%(prog)s {__version__}')
    parser.add_argument('--timeout', type=int, default=30,
                        help='Timeout for each test in seconds (default: 30)')
    parser.add_argument('test_program', type=str, help='Test program')
    parser.add_argument(
        'test', type=str, help='Test file or folder with all the tests to run')
    args = parser.parse_args(sys.argv[1:])
    if not is_executable(args.test_program):
        eprint("Test program is not executable.")
        sys.exit(1)
    if not is_file(args.test) and not is_directory(args.test):
        eprint("Test file or folder does not exist.")
        sys.exit(1)
    tests = []
    if is_directory(args.test):
        tests = sorted(glob.glob(args.test + "/??"))
    else:
        tests.append(args.test)
    correct_count = 0
    for test in tests:
        print("Test running: " + test + " ... ", end="")
        try:
            output = subprocess.run([args.test_program, test],
                                    capture_output=True,
                                    text=True,
                                    encoding="utf-8",
                                    timeout=args.timeout)
            if output.returncode != 0:
                print(
                    f"\033[31mTest finished with error code {output.returncode}\033[0m")
                print(output.stderr)
            else:
                with open(test + ".a", encoding="utf-8") as f:
                    expected_output = f.read()
                if output.stdout != expected_output:
                    print("\033[31mTest failed.\033[0m")
                    print("Expected output:")
                    print("["+expected_output+"]")
                    print("Actual output:")
                    print("["+output.stdout+"]")
                else:
                    print("\033[32mTest passed.\033[0m")
                    correct_count += 1
        except subprocess.TimeoutExpired:
            print("\033[31mTest timed out.\033[0m")
        except Exception as e:
            print(f"\033[31mTest failed with an unexpected error: {e}\033[0m")
    print(f"{correct_count}/{len(tests)} tests passed.")
    if correct_count == len(tests):
        sys.exit(0)
    else:
        sys.exit(1)