import datetime
import random

ProductCode = {
    'Xmanager' : 0,
    'Xshell' : 1,
    'Xlpd' : 2,
    'Xfile' : 3,
    'Xftp' : 4,
    'Xmanager 3D' : 5,
    'Xmanager Enterprise' : 6,
    'Xshell Plus' : 7
}

LicenseType = [
    [ ProductCode['Xmanager'], 0x0B, 0, 'Standard', 2],
    [ ProductCode['Xmanager'], 0x0C, 0, 'Educational', 2],
    [ ProductCode['Xmanager'], 0x0F, 0, 'Standard', 1],
    [ ProductCode['Xmanager'], 0x10, 0, 'Educational', 1],
    [ ProductCode['Xmanager'], 0x16, 2, 'Student 2-year Subscription', 2],
    [ ProductCode['Xmanager'], 0x18, 4, 'Student 4-year Subscription', 2],
    [ ProductCode['Xmanager'], 0x20, 2, 'Student 2-year Subscription', 1],
    [ ProductCode['Xmanager'], 0x22, 4, 'Student 4-year Subscription', 1],
    [ ProductCode['Xmanager'], 0x3D, 0, 'Standard Subscription', 2],
    [ ProductCode['Xmanager'], 0x3E, 0, 'Educational Subscription', 2],
    [ ProductCode['Xmanager'], 0x41, 0, 'Standard Subscription', 1],
    [ ProductCode['Xmanager'], 0x42, 0, 'Educational Subscription', 1],
    [ ProductCode['Xmanager'], 0x47, 0, 'Standard Subscription', 2],      # Concurrent Registered
    [ ProductCode['Xmanager'], 0x48, 0, 'Educational Subscription', 2],   # Concurrent Registered
    [ ProductCode['Xmanager'], 0x4B, 0, 'Standard Subscription', 1],      # Concurrent Registered
    [ ProductCode['Xmanager'], 0x4C, 0, 'Educational Subscription', 1],   # Concurrent Registered
    [ ProductCode['Xmanager'], 0x51, 0, 'Standard', 2],                   # Concurrent Registered
    [ ProductCode['Xmanager'], 0x52, 0, 'Educational', 2],                # Concurrent Registered
    [ ProductCode['Xmanager'], 0x55, 0, 'Standard', 1],                   # Concurrent Registered
    [ ProductCode['Xmanager'], 0x56, 0, 'Educational', 1],                # Concurrent Registered
    [ ProductCode['Xmanager'], 0x60, 0, 'Standard', 1],
    [ ProductCode['Xmanager'], 0x61, 0, 'Standard', 2],
    [ ProductCode['Xmanager'], 0x62, 0, 'Standard', 1],
    [ ProductCode['Xmanager'], 0x63, 0, 'Standard', 2],
    [ ProductCode['Xmanager'], 0x29, 1, 'CLS Class A', 2],
    [ ProductCode['Xmanager'], 0x2A, 1, 'CLS Class B', 2],
    [ ProductCode['Xmanager'], 0x2B, 1, 'CLS Class C', 2],
    [ ProductCode['Xmanager'], 0x2C, 1, 'DLS', 2],
    [ ProductCode['Xmanager'], 0x2D, 1, 'SLS', 2],
    [ ProductCode['Xmanager'], 0x33, 1, 'CLS Class A', 1],
    [ ProductCode['Xmanager'], 0x34, 1, 'CLS Class B', 1],
    [ ProductCode['Xmanager'], 0x35, 1, 'CLS Class C', 1],
    [ ProductCode['Xmanager'], 0x36, 1, 'DLS', 1],
    [ ProductCode['Xmanager'], 0x37, 1, 'SLS', 1],
    [ ProductCode['Xshell Plus'], 0x0B, 0, 'Standard', 2],
    [ ProductCode['Xshell'], 0x0B, 0, 'Standard', 2],
    [ ProductCode['Xshell'], 0x0C, 0, 'Educational', 2],
    [ ProductCode['Xshell'], 0x0F, 0, 'Standard', 1],
    [ ProductCode['Xshell'], 0x10, 0, 'Educational', 1],
    [ ProductCode['Xshell'], 0x16, 2, 'Student 2-year Subscription', 2],
    [ ProductCode['Xshell'], 0x18, 4, 'Student 4-year Subscription', 2],
    [ ProductCode['Xshell'], 0x20, 2, 'Student 2-year Subscription', 1],
    [ ProductCode['Xshell'], 0x22, 4, 'Student 4-year Subscription', 1],
    [ ProductCode['Xshell'], 0x3D, 0, 'Standard Subscription', 2],
    [ ProductCode['Xshell'], 0x3E, 0, 'Educational Subscription', 2],
    [ ProductCode['Xshell'], 0x41, 0, 'Standard Subscription', 1],
    [ ProductCode['Xshell'], 0x42, 0, 'Educational Subscription', 1],
    [ ProductCode['Xshell'], 0x47, 0, 'Standard Subscription', 2],
    [ ProductCode['Xshell'], 0x48, 0, 'Educational Subscription', 2],
    [ ProductCode['Xshell'], 0x4B, 0, 'Standard Subscription', 1],
    [ ProductCode['Xshell'], 0x4C, 0, 'Educational Subscription', 1],
    [ ProductCode['Xshell'], 0x51, 0, 'Standard', 2],
    [ ProductCode['Xshell'], 0x52, 0, 'Educational', 2],
    [ ProductCode['Xshell'], 0x55, 0, 'Standard', 1],
    [ ProductCode['Xshell'], 0x56, 0, 'Educational', 1],
    [ ProductCode['Xshell'], 0x60, 0, 'Standard', 1],   # ������
    [ ProductCode['Xshell'], 0x61, 0, 'Standard', 2],   # ������
    [ ProductCode['Xshell'], 0x62, 0, 'Standard', 1],
    [ ProductCode['Xshell'], 0x63, 0, 'Standard', 2],
    [ ProductCode['Xlpd'], 0x0B, 0, 'Standard', 2],
    [ ProductCode['Xlpd'], 0x0F, 0, 'Standard', 1],
    [ ProductCode['Xlpd'], 0x3D, 0, 'Standard Subscription', 2],
    [ ProductCode['Xlpd'], 0x3E, 0, 'Educational Subscription', 2],
    [ ProductCode['Xlpd'], 0x41, 0, 'Standard Subscription', 1],
    [ ProductCode['Xlpd'], 0x42, 0, 'Educational Subscription', 1],
    [ ProductCode['Xlpd'], 0x47, 0, 'Standard Subscription', 2],
    [ ProductCode['Xlpd'], 0x48, 0, 'Educational Subscription', 2],
    [ ProductCode['Xlpd'], 0x4B, 0, 'Standard Subscription', 1],
    [ ProductCode['Xlpd'], 0x4C, 0, 'Educational Subscription', 1],
    [ ProductCode['Xlpd'], 0x51, 0, 'Standard', 2],
    [ ProductCode['Xlpd'], 0x55, 0, 'Standard', 1],
    [ ProductCode['Xlpd'], 0x60, 0, 'Standard', 1],
    [ ProductCode['Xlpd'], 0x61, 0, 'Standard', 2],
    [ ProductCode['Xlpd'], 0x62, 0, 'Standard', 1],
    [ ProductCode['Xlpd'], 0x63, 0, 'Standard', 2],
    [ ProductCode['Xfile'], 0x0F, 0, 'Standard', 1],
    [ ProductCode['Xftp'], 0x0B, 0, 'Standard', 2],
    [ ProductCode['Xftp'], 0x0F, 0, 'Standard', 1],
    [ ProductCode['Xftp'], 0x3D, 0, 'Standard Subscription', 2],
    [ ProductCode['Xftp'], 0x3E, 0, 'Educational Subscription', 2],
    [ ProductCode['Xftp'], 0x41, 0, 'Standard Subscription', 1],
    [ ProductCode['Xftp'], 0x42, 0, 'Educational Subscription', 1],
    [ ProductCode['Xftp'], 0x47, 0, 'Standard Subscription', 2],
    [ ProductCode['Xftp'], 0x48, 0, 'Educational Subscription', 2],
    [ ProductCode['Xftp'], 0x4B, 0, 'Standard Subscription', 1],
    [ ProductCode['Xftp'], 0x4C, 0, 'Educational Subscription', 1],
    [ ProductCode['Xftp'], 0x51, 0, 'Standard', 2],
    [ ProductCode['Xftp'], 0x55, 0, 'Standard', 1],
    [ ProductCode['Xftp'], 0x60, 0, 'Standard', 1],
    [ ProductCode['Xftp'], 0x61, 0, 'Standard', 2],
    [ ProductCode['Xftp'], 0x62, 0, 'Standard', 1],
    [ ProductCode['Xftp'], 0x63, 0, 'Standard', 2],
    [ ProductCode['Xmanager 3D'], 0x0B, 0, 'Standard', 2],
    [ ProductCode['Xmanager 3D'], 0x0C, 0, 'Educational', 2],
    [ ProductCode['Xmanager 3D'], 0x0F, 0, 'Standard', 1],
    [ ProductCode['Xmanager 3D'], 0x10, 0, 'Educational', 1],
    [ ProductCode['Xmanager Enterprise'], 0x0B, 0, '', 2],
    [ ProductCode['Xmanager Enterprise'], 0x0C, 0, 'Educational', 2],
    [ ProductCode['Xmanager Enterprise'], 0x0F, 0, '', 1],
    [ ProductCode['Xmanager Enterprise'], 0x10, 0, 'Educational', 1],
    [ ProductCode['Xmanager Enterprise'], 0x3D, 0, 'Standard Subscription', 2],
    [ ProductCode['Xmanager Enterprise'], 0x3E, 0, 'Educational Subscription', 2],
    [ ProductCode['Xmanager Enterprise'], 0x41, 0, 'Standard Subscription', 1],
    [ ProductCode['Xmanager Enterprise'], 0x42, 0, 'Educational Subscription', 1],
    [ ProductCode['Xmanager Enterprise'], 0x47, 0, 'Standard Subscription', 2],
    [ ProductCode['Xmanager Enterprise'], 0x48, 0, 'Educational Subscription', 2],
    [ ProductCode['Xmanager Enterprise'], 0x4B, 0, 'Standard Subscription', 1],
    [ ProductCode['Xmanager Enterprise'], 0x4C, 0, 'Educational Subscription', 1],
    [ ProductCode['Xmanager Enterprise'], 0x51, 0, '', 2],
    [ ProductCode['Xmanager Enterprise'], 0x52, 0, 'Educational', 2],
    [ ProductCode['Xmanager Enterprise'], 0x55, 0, '', 1],
    [ ProductCode['Xmanager Enterprise'], 0x56, 0, 'Educational', 1],
    [ ProductCode['Xmanager Enterprise'], 0x60, 0, 'Standard', 1],
    [ ProductCode['Xmanager Enterprise'], 0x61, 0, 'Standard', 2],
    [ ProductCode['Xmanager Enterprise'], 0x62, 0, 'Standard', 1],
    [ ProductCode['Xmanager Enterprise'], 0x63, 0, 'Standard', 2],
]

ProductPublishList = (
    { 'ProductName' : 'Xmanager', 'Version' : 2, 'PublishDate' : datetime.date(2003, 1, 1) },
    { 'ProductName' : 'Xshell', 'Version' : 2, 'PublishDate' : datetime.date(2004, 10, 1) },

    { 'ProductName' : 'Xmanager', 'Version' : 3, 'PublishDate' : datetime.date(2007, 1, 1) },
    { 'ProductName' : 'Xshell', 'Version' : 3, 'PublishDate' : datetime.date(2007, 1, 1) },
    { 'ProductName' : 'Xlpd', 'Version' : 3, 'PublishDate' : datetime.date(2007, 1, 1) },
    { 'ProductName' : 'Xftp', 'Version' : 3, 'PublishDate' : datetime.date(2007, 1, 1) },
    { 'ProductName' : 'Xmanager Enterprise', 'Version' : 3, 'PublishDate' : datetime.date(2007, 1, 1) },

    { 'ProductName' : 'Xmanager', 'Version' : 4, 'PublishDate' : datetime.date(2010, 8, 1) },
    { 'ProductName' : 'Xshell', 'Version' : 4, 'PublishDate' : datetime.date(2010, 8, 1) },
    { 'ProductName' : 'Xlpd', 'Version' : 4, 'PublishDate' : datetime.date(2010, 8, 1) },
    { 'ProductName' : 'Xftp', 'Version' : 4, 'PublishDate' : datetime.date(2010, 8, 1) },
    { 'ProductName' : 'Xmanager Enterprise', 'Version' : 4, 'PublishDate' : datetime.date(2010, 8, 1) },
    { 'ProductName' : 'Xmanager', 'Version' : 5, 'PublishDate' : datetime.date(2014, 4, 28) },
    { 'ProductName' : 'Xshell', 'Version' : 5, 'PublishDate' : datetime.date(2014, 4, 28) },
    { 'ProductName' : 'Xlpd', 'Version' : 5, 'PublishDate' : datetime.date(2014, 4, 28) },
    { 'ProductName' : 'Xftp', 'Version' : 5, 'PublishDate' : datetime.date(2014, 4, 28) },
    { 'ProductName' : 'Xmanager Enterprise', 'Version' : 5, 'PublishDate' : datetime.date(2014, 4, 28) },
    { 'ProductName' : 'Xmanager', 'Version' : 6, 'PublishDate' : datetime.date(2018, 4, 29) },
    { 'ProductName' : 'Xshell', 'Version' : 6, 'PublishDate' : datetime.date(2018, 4, 29) },
    { 'ProductName' : 'Xshell Plus', 'Version' : 6, 'PublishDate' : datetime.date(2018, 4, 29) },
    { 'ProductName' : 'Xlpd', 'Version' : 6, 'PublishDate' : datetime.date(2018, 4, 29) },
    { 'ProductName' : 'Xftp', 'Version' : 6, 'PublishDate' : datetime.date(2018, 4, 29) },
    { 'ProductName' : 'Xmanager Enterprise', 'Version' : 6, 'PublishDate' : datetime.date(2018, 4, 29) }
)

def GetChecksum(preProductKey : str):
    Checksum = 1
    for i in range(0, len(preProductKey)):
        if preProductKey[i] != '-' and preProductKey[i] != '8' and preProductKey[i] != '9':
            place = int(preProductKey[i])
            Checksum = (9 - place) * Checksum % -1000
    Checksum = (Checksum + int(preProductKey[9])) % 1000
    return Checksum

def GenerateProductKey(IssueDate : datetime.date,
                       ProductName : str,
                       ProductVersion : int,
                       NumberOfLicense : int):
    if IssueDate.year < 2002:
        raise ValueError('IssueDate cannot be earlier than 2002.')
    if IssueDate > datetime.date.today() + datetime.timedelta(days = 7):
        raise ValueError('IssueDate cannot be later than today after a week.')
    if NumberOfLicense < 0 or NumberOfLicense > 999:
        raise ValueError('NumberOfLicense must vary from 0 to 999.')

    for item in ProductPublishList:
        if item['ProductName'] == ProductName and item['Version'] == ProductVersion:
            if item['PublishDate'] > IssueDate:
                raise ValueError('IssueDate cannot be earlier than the publish date.')
            break
        if item == ProductPublishList[-1]:
            raise ValueError('Invalid product.')

    preProductKey = '%02d%02d%02d-%02d%d%03d-%03d' % (IssueDate.year - 2000,
                                                        IssueDate.month,
                                                        IssueDate.day,
                                                        0x0B,
                                                        ProductCode[ProductName],
                                                        random.randint(0, 999),
                                                        NumberOfLicense)
    Checksum = GetChecksum(preProductKey)
    ProductKey = preProductKey + '%03d' % Checksum
    return ProductKey

print(GenerateProductKey(datetime.date(2017, 12, 15), 'Xmanager Enterprise', 5, 999))