#! /usr/bin/env python3
#
# SPDX-License-Identifier: MIT
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import os
import sys
import configparser

def getVars(file, vars = {}):
    if not os.path.exists(file):
        sys.exit(f"{file} does not exist!")

    cf = configparser.ConfigParser()
    cf.read(file)

    for k, v in cf.items('config_bsp'):
        if k in vars and vars[k] != "":
            continue
        vars[k] = v

    return vars


def usage():
    print("Used to combine multiple qemuboot.conf files, non-blank values replace prior values.\n")
    print("%s: <command> <argument> ...\n" % sys.argv[0])
    print("     load <file>  - load a new file")
    print("     merge <file> - load and fill any new/empty variables")
    print("     remove <var> - Remove a variable\n")
    print("   Commands can be chained, such as:")
    print("      load file1 remove val1 merge file2")
    print()

def main():
    if "help" in sys.argv or '-h' in sys.argv or '--help' in sys.argv:
        usage()
        return 0

    vars = {}

    idx = 1
    while(idx < len(sys.argv)):
        arg = sys.argv[idx]
        if arg == "load":
            idx += 1
            vars = getVars(sys.argv[idx], {})
        elif arg == "merge":
            idx += 1
            vars = getVars(sys.argv[idx], vars)
        elif arg == "remove":
            idx += 1
            key = sys.argv[idx]
            if key not in vars:
                print(f"remove: Variable {key} not found")
                sys.exit(-1)
            del vars[key]
        else:
            print(f"Unknown command {arg}")
            sys.exit(-1)

        idx += 1

    print('[config_bsp]')
    for var in sorted(vars.items()):
        print('%s = %s' % (var[0], var[1]))


if __name__ == "__main__":
    sys.exit(main())