#!/usr/bin/env python3
import os
from time import gmtime, strftime
from argparse import ArgumentParser
from configparser import ConfigParser
from pathlib import Path

def handle_args():
    parser = ArgumentParser()
    parser.add_argument('config', help='location of strike.ini file (or a directory containing it)')
    return parser.parse_args()

def read_config(location):
    location = Path(location)
    config = ConfigParser()
    if location.is_dir():
        location = location/'strike.ini'
    if not location.exists():
        raise FileNotFoundError(f'Config file not found at {location}.')
    config.read(location)
    return location.resolve().parent, config

def handle_file(file):
    meta = dict(
        title = file.stem,
        date = strftime('%a, %d %b %Y %H:%M:%S GMT', gmtime(file.stat().st_mtime))
    )
    contents = file.read_text()
    delim = '---\n'
    if contents.startswith(delim):
        parts = contents.split(delim, maxsplit=2)
        meta.update(dict((key.strip(), value.strip())
            for key, value in (line.split('=') for line in parts[1].splitlines())
        ))
        contents = parts[2]
    return contents, meta

def apply_template(content, meta, template="{content}"):
    return template.format(
        content = content,
        meta = meta
    )

def main():
    args = handle_args()
    basedir, config = read_config(args.config)

    input_dir = basedir/config['Input']['directory']

    exclusions = config['Input']['excludes'].splitlines()

    default_template = basedir/config['Templates']['default']
    template = default_template.read_text()

    output_dir = basedir/config['Output']['directory']
    output_dir.mkdir(parents=True, exist_ok=True)

    for file in os.listdir(input_dir):
        if (input_dir/file).is_dir():
            continue
        if file in exclusions:
            continue 
        contents, meta = handle_file(input_dir/file)
        output = apply_template(contents, meta, template)
        (output_dir/file).write_text(output)

if __name__ == '__main__':
    import sys
    sys.exit(main())