#!/usr/bin/env python

import sys
import json
import pprint
import argparse
import datetime
import itertools


defaults = {
    '--sdram-module': [
        'IS42S16160',
        'IS42S16320',
        'MT48LC4M16',
        'MT48LC16M16',
        'AS4C16M16',
        'AS4C32M16',
        'AS4C32M8',
        'M12L64322A',
        'M12L16161A',
        'MT46V32M16',
        'MT46H32M16',
        'MT46H32M32',
        'MT47H128M8',
        'MT47H32M16',
        'MT47H64M16',
        'P3R1GE4JGF',
        'MT41K64M16',
        'MT41J128M16',
        'MT41K128M16',
        'MT41J256M16',
        'MT41K256M16',
        'K4B1G0446F',
        'K4B2G1646F',
        'H5TC4G63CFR',
        'IS43TR16128B',
        'MT8JTF12864',
        'MT8KTF51264',
        #  'MT18KSF1G72HZ',
        #  'AS4C256M16D3A',
        #  'MT16KTF1G64HZ',
        #  'EDY4016A',
        #  'MT40A1G8',
        #  'MT40A512M16',
    ],
    '--sdram-data-width': [32],
    '--bist-alternating': [True, False],
    '--bist-length':      [1, 4096],
    '--bist-random':      [True, False],
    '--num-generators':   [1],
    '--num-checkers':     [1],
    '--access-pattern':   ['access_pattern.csv']
}


def convert_string_arg(args, arg, type):
    map_func = {
        bool: lambda s: {'false': False, 'true': True}[s.lower()],
        int:  lambda s: int(s, 0),
    }
    setattr(args, arg, [map_func[type](val) if not isinstance(val, type) else val for val in getattr(args, arg)])


def generate_header(args):
    header = 'Auto-generated on {} by {}'.format(
        datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
        sys.argv[0],
    )
    args_str = pprint.pformat(vars(args), sort_dicts=False)
    arg_lines = args_str.split('\n')
    lines = [60*'=', header, 60*'-', *arg_lines, 60*'=']
    return '\n'.join('# ' + line for line in lines)


def main():
    parser = argparse.ArgumentParser(description='Generate configuration for all possible argument combinations.',
                                     formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('--name-format', default='test_%d', help='Name format for i-th test')
    for name, default in defaults.items():
        parser.add_argument(name, nargs='+', default=default, help='%s options' % name)
    args = parser.parse_args()

    # make sure not to write those as strings
    convert_string_arg(args, 'sdram_data_width', int)
    convert_string_arg(args, 'bist_alternating', bool)
    convert_string_arg(args, 'bist_length',      int)
    convert_string_arg(args, 'bist_random',      bool)
    convert_string_arg(args, 'num_generators',   int)
    convert_string_arg(args, 'num_checkers',     int)

    common_args = ('sdram_module', 'sdram_data_width', 'bist_alternating', 'num_generators', 'num_checkers')
    generated_pattern_args = ('bist_length', 'bist_random')
    custom_pattern_args = ('access_pattern', )

    def generated_pattern_configuration(values):
        config = dict(zip(common_args + generated_pattern_args, values))
        # move access pattern parameters deeper
        config['access_pattern'] = {
            'bist_length': config.pop('bist_length'),
            'bist_random': config.pop('bist_random'),
        }
        return config

    def custom_pattern_configuration(values):
        config = dict(zip(common_args + custom_pattern_args, values))
        # "rename" --access-pattern to access_pattern.pattern_file due to name difference between
        # command line args and run_benchmarks.py configuration format
        config['access_pattern'] = {
            'pattern_file': config.pop('access_pattern'),
        }
        return config

    # iterator over the product of given command line arguments
    def args_product(names):
        return itertools.product(*(getattr(args, name) for name in names))

    generated_pattern_iter = zip(itertools.repeat(generated_pattern_configuration), args_product(common_args + generated_pattern_args))
    custom_pattern_iter = zip(itertools.repeat(custom_pattern_configuration), args_product(common_args + custom_pattern_args))

    i = 0
    configurations = {}
    for config_generator, values in itertools.chain(generated_pattern_iter, custom_pattern_iter):
        config = config_generator(values)
        # ignore unsupported case: bist_random=True and bist_alternating=False
        if config['access_pattern'].get('bist_random', False) and not config['bist_alternating']:
            continue
        configurations[args.name_format % i] = config
        i += 1

    json_str = json.dumps(configurations, indent=4)
    print(generate_header(args))
    print(json_str)


if __name__ == "__main__":
    main()