#-------------------------------------------------------------------------------------------------------
# Copyright (C) Microsoft. All rights reserved.
# Copyright (c) ChakraCore Project Contributors. All rights reserved.
# Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
#-------------------------------------------------------------------------------------------------------

# Python 2.7 and 3.x compatibility for easier testing regardless of python installation
from __future__ import print_function

import sys
import os.path
import re

copyright_lines = [
    r'-------------------------------------------------------------------------------------------------------',
    r' Copyright \(C\) Microsoft( Corporation and contributors)?\. All rights reserved\.',
    r' Copyright \(c\)( 2022)? ChakraCore Project Contributors\. All rights reserved\.',
    r' Licensed under the MIT license\. See LICENSE\.txt file in the project root for full license information\.',
    r'.*' # the above should always be followed by at least one other line, so make sure that line is present
]

regexes = []
for line in copyright_lines:
    pattern = '^.{1,5}%s$' % line
    regexes.append(re.compile(pattern))

if len(sys.argv) < 2:
    print("Requires passing a filename as an argument.")
    exit(1)

file_name = sys.argv[1]
if not os.path.isfile(file_name):
    print("File does not exist:", file_name, "(not necessarily an error)")
    exit(0)

def report_incorrect(file_name, pairs):
    # found a problem so report the problem to the caller and exit
    print(file_name, "... does not contain a correct copyright notice.\n")
    # print the relevant lines to help the reader find the problem
    for (_, line) in pairs:
        print("    ", line, end="")
    print()

linecount = 0
pairs = []
with open(file_name, 'r') as sourcefile:
    hashbang = sourcefile.readline()
    if not hashbang.startswith("#!"):
        sourcefile.seek(0)
    pairs += zip(regexes, sourcefile)

for (regex, line) in pairs:
    linecount += 1
    line = line.rstrip()
    matches = regex.match(line)
    if not matches:
        report_incorrect(file_name, pairs)
        exit(1)

if linecount == 0:
    # the file was empty (e.g. dummy.js) so no problem
    exit(0)
elif linecount != len(regexes):
    report_incorrect(file_name, pairs)
    exit(1)