import os
import argparse
import glob
import json
import sys

def check_python_version():
    python_version = sys.version_info
    if not (python_version.major >= 3 and python_version.minor >= 3):
        print("Minimum Python version needed: 3.3.0")
        sys.exit(1)


def init():
    # set up two parsers: first parse config directory,  and add dynamic arguments to full parser
    config_parser = argparse.ArgumentParser(add_help=False)
    parser = argparse.ArgumentParser()

    # parsers need to share known arguments
    config_parser.add_argument('--config', help='Path to config directory [$pwd/config]', default=os.getcwd()+"/config")
    config_parser.add_argument('--prefix', help='Path where install directory should be generated [$pwd]', default=os.getcwd())
    config_parser.add_argument('--src', help='Path where to download source  code to [$pwd/src]', default=os.getcwd()+"/src")
    config_parser.add_argument('--work', help='Path to working directory for builds [$pwd/work', default=os.getcwd()+"/work")
    config_parser.add_argument('--keep-work', help='Disable removal of work directory after successful builds', action='store_true')
    config_parser.add_argument('--compiler', help='Select compiler (gnu, intel, aocc) [gnu]', default='gnu')
    config_parser.add_argument('--mpi', help='Select compiler (hpcx, intelmpi, openmpi) [hpcx]', default='hpcx')
    config_parser.add_argument('--threads', help='Number of threads used for make [8]', default='8')
    config_parser.add_argument('--verbose', help='Print build output to screen instead piping it to logile', action='store_true')
    config_parser.add_argument('--separate-lib64', help='Do not create symbolic links of files from lib64 in lib', action='store_true')
    config_parser.add_argument('--disable-shared', help='Disable building of shared libraries', action='store_true')
    
    parser.add_argument('--config', help='Path to config directory [$pwd/config]', default=os.getcwd()+"/config")
    parser.add_argument('--prefix', help='Path where install directory should be generated [$pwd]', default=os.getcwd())
    parser.add_argument('--src', help='Path where to download source  code to [$pwd/src]', default=os.getcwd()+"/src")
    parser.add_argument('--work', help='Path to working directory for builds [$pwd/work]', default=os.getcwd()+"/work")
    parser.add_argument('--keep-work', help='Disable removal of work directory after successful builds', action='store_true')
    parser.add_argument('--compiler', help='Select compiler (gnu, intel, aocc) [gnu]', default='gnu')
    parser.add_argument('--mpi', help='Select compiler (hpcx, intelmpi, openmpi) [hpcx]', default='hpcx')
    parser.add_argument('--threads', help='Number of threads used for make [8]', default='8')
    parser.add_argument('--verbose', help='Print build output to screen instead piping it to logile', action='store_true')
    parser.add_argument('--separate-lib64', help='Do not create symbolic links of files from lib64 in lib', action='store_true')
    parser.add_argument('--disable-shared', help='Disable building of shared libraries', action='store_true')
    
    # run config parser and search config/*.json to add a build and version argument for it to the full parser
    config_dir = config_parser.parse_known_args()[0].config
    for cf in glob.glob(config_dir+"/*.json"):
        with open(cf, 'r') as f:
            lib_data = json.load(f)
            parser.add_argument('--'+lib_data['name'], help='Enable build of '+lib_data['name'], action='store_true')
            parser.add_argument('--'+lib_data['name']+'-version', help='Set '+lib_data['name']+' version ['+lib_data['default version']+']', default=str(lib_data['default version']))

    # run full parser
    arg_namespace = parser.parse_args()
    args = vars(arg_namespace)
    
    return arg_namespace, args