"""This script finds all '.properties-MERGED' files and writes relative path, key, and value to a CSV file.
This script requires the python libraries: gitpython and jproperties.  As a consequence, it also requires
git >= 1.7.0 and python >= 3.4.  This script relies on fetching 'HEAD' from current branch.  So make sure
repo is on correct branch (i.e. develop).
"""

import sys

from envutil import get_proj_dir
from gitutil import get_property_file_entries, get_commit_id, get_git_root
from csvutil import records_to_csv
from typing import Union
import re
import argparse


def write_items_to_csv(repo_path: str, output_path: str, show_commit: bool, value_regex: Union[str, None]):
    """Determines the contents of '.properties-MERGED' files and writes to a csv file.

    Args:
        repo_path (str): The local path to the git repo.
        output_path (str): The output path for the csv file.
        show_commit (bool): Whether or not to include the commit id in the header
    """

    row_header = ['Relative path', 'Key', 'Value']
    if show_commit:
        row_header.append(get_commit_id(repo_path, 'HEAD'))

    rows = [row_header]

    for entry in get_property_file_entries(repo_path):
        if value_regex is None or re.match(value_regex, entry.value):
            rows.append([entry.rel_path, entry.key, entry.value])

    records_to_csv(output_path, rows)


def main():
    parser = argparse.ArgumentParser(description='Gathers all key-value pairs within .properties-MERGED files into '
                                                 'one csv file.',
                                     formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument(dest='output_path', type=str, help='The path to the output csv file.')
    parser.add_argument('-r', '--repo', dest='repo_path', type=str, required=False,
                        help='The path to the repo.  If not specified, path of script is used.')
    parser.add_argument('-nc', '--no_commit', dest='no_commit', action='store_true', default=False,
                        required=False, help="Suppresses adding commits to the generated csv header.")
    parser.add_argument('-vr', '--value-regex', dest='value_regex', type=str, default=None, required=False,
                        help='Specify the regex for the property value where a regex match against the property value '
                             'will display the key value pair in csv output (i.e. \'[a-zA-Z]\' or \'\\S\' for removing '
                             'just whitespace items).  If this option is not specified, all key value pairs will be '
                             'accepted.')

    args = parser.parse_args()
    repo_path = args.repo_path if args.repo_path is not None else get_git_root(get_proj_dir())
    output_path = args.output_path
    show_commit = not args.no_commit
    value_regex = args.value_regex

    write_items_to_csv(repo_path, output_path, show_commit, value_regex)

    sys.exit(0)


if __name__ == "__main__":
    main()