'''
Command line module for making Team Fortress 2 macro scripts from
YAML source code.
'''

__all__     = ['parseFile']
__author__  = 'Nicholas Hope <tfscript@nickhope.world'
__date__    = '26 August 2022'
__version__ = '1.0'
__copyright__ = 'Copyright © 2022 Nicholas Hope. See LICENSE for details.'

# Standard libraries
from sys import stderr
from os import mkdir, sep as dirsep
from os.path import isdir, expanduser, normpath
import argparse
from warnings import warn
from tempfile import NamedTemporaryFile
import yaml
from platform import system as GetOSName, release as GetOSRelease

try:
    from winreg import HKEY_LOCAL_MACHINE, ConnectRegistry, OpenKey, EnumValue
except ModuleNotFoundError:
    # Not running on windows
    pass

# Local libraries
import tfscript
from tfscript import verify, writing, makeCFG

args = {}
targetDir = ''

def parseFile(inputFile) -> (dict, dict):
    '''Parse, verify, and do the conversion.'''
    config = yaml.safe_load(inputFile)

    # See verify.py
    config, defaults = verify.verifyConfig(config)
    if 'warnings' in config:
        for cclass, messages in config.pop('warnings').items():
            print(f'Warning in {cclass}:', file=stderr)
            for msg in messages:
                print(f'    {msg}', file=stderr)

    if 'errors' in config:
        for cclass, messages in config['errors'].items():
            print(f'Error in {cclass}:', file=stderr)
            for msg in messages:
                print(f'    {msg}', file=stderr)
        return None, None
    else:
        return config, defaults

def parseConfig(config, defaults):
    '''With validated data structure, write out all the files.'''
    global args
    global targetDir

    if isdir(targetDir) == False:
        mkdir(targetDir)
        if args.debug:
            print( f'DEBUG: Created directory {targetDir}', file=stderr)

    tempsAndReals = {}

    if defaults is not None:
        config.update({'default': defaults})

    for class_ in config:
        stringToWrite = makeCFG(
            config[class_],
            default=(class_ == 'default')
        )
        replaceDict = writing.writeOutput(stringToWrite, class_, args)
        tempsAndReals.update(replaceDict)

    return tempsAndReals

def parseCLI():
    # Handle command line
    parser = argparse.ArgumentParser(
        description='Parse YAML file and produce TF2 config script.'
    )
    parser.add_argument( '-d', '--debug', action='store_true',
        help='Enable debugging messages.')
    parser.add_argument( '-n', '--dry-run', action='store_true',
        help='Parse input file, but don\'t write anything.')
    parser.add_argument( '-f', '--force', action='store_true',
        help='Force tfscript to continue until catastrophic failure')
    parser.add_argument( '-D', '--directory', action='store', type=str,
        help='Change output directory')
    # warnings
    parseWarnNames = [
        'implicit-release', 'implicit-off',
        'implicit-primary', 'implicit-secondary',
        'implicit'
    ]
    for warnName in parseWarnNames:
        splitWarnName = ' '.join(warnName.split('-'))
        parser.add_argument( '-W' + warnName, action='store_true',
            help=f'Generate warning on {splitWarnName} creation')
    # positional argument: first non-hyphenated argument is input file
    parser.add_argument( 'infile', type=argparse.FileType('r'),
        help='File containing YAML to convert.')
    return parser

def getTargetDir(systemName):
    if systemName == 'Darwin':
        if float( '.'.join( GetOSRelease().split('.')[0:2] ) ) >= 10.15:
            warn(
                'As of macOS Catalina (v10.15), 32-bit applications'
                + ' like TF2 do not run. tfscript will run, but you can\'t run TF2'
                + ' on this system',
                category=RuntimeWarning )
        return expanduser('~/Library/Application Support/Steam')

    if systemName == 'Windows':
        # oh god why do we have to use the registry
        accessReg = ConnectRegistry(None, HKEY_LOCAL_MACHINE)
        accessKey = OpenKey(accessReg, 'SOFTWARE\\WOW6432Node\\Valve\\Steam')
        keyNum = 0
        while True:
            try:
                accessSubkeyName, data, _ = EnumValue(accessKey, keyNum)
            except EnvironmentError:
                break
            else:
                if accessSubkeyName == 'InstallPath':
                    return data
                keyNum += 1
        return None

    if systemName == 'Linux':
        homedir = expanduser('~')
        for potentialdir in ['.steam/steam', '.local/share/Steam']:
            fullTargetPath = normpath(f'{homedir}/{potentialdir}')
            if isdir(fullTargetPath):
                return fullTargetPath
        return None

    if systemName == 'Java':
        warn('Java-based OSes are not supported yet by tfscript.', category=RuntimeWarning)

    return None

def main() -> int:
    ''' Command line interface. '''
    global args
    global targetDir
    parser = parseCLI()

    args = parser.parse_args()

    systemName = GetOSName()
    if args.directory is not None:
        targetDir = normpath(args.directory) + dirsep
    else:
        targetDir = getTargetDir(systemName)
        if targetDir is not None:
            # Supported OS: add steamapps path
            targetDir += normpath('/steamapps/common/Team Fortress 2/tf/cfg') + dirsep
        elif args.force:
            # Unsupported OS but -f specified
            if args.debug:
                print('DEBUG: forced to continue, output set to current directory', file=stderr)
            targetDir = '.'
        else:
            # Unsupported OS and not forced to continue
            return 2

    config, defaults = parseFile(args.infile)
    if config is None:
        return 2

    fileNames = parseConfig(config, defaults)
    fileList = writing.replaceFiles(targetDir, fileNames, args)
    defaultsGiven = (defaults is not None)
    writing.appendToActuals(targetDir, fileList, defaultsGiven, args)

    return 0

if __name__ == '__main__':
    exit(main())