#!/usr/bin/env python3
from __future__ import annotations

import argparse
from pathlib import Path


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument('--file', required=True)
    ap.add_argument('--items', required=True)
    args = ap.parse_args()

    p = Path(args.file)
    items = Path(args.items).read_text(encoding='utf-8')
    s = p.read_text(encoding='utf-8')

    marker = 'const CourseItem items[] = {'
    i = s.find(marker)
    if i < 0:
        raise SystemExit(f'cannot find marker: {marker}')

    j = s.find('};', i)
    if j < 0:
        raise SystemExit('cannot find end marker "};" after items start')

    before = s[:i]
    after = s[j+2:]

    out = before + items + after
    if out == s:
        print('no change')
        return

    backup = p.with_suffix(p.suffix + '.bak_cppbasic20')
    backup.write_text(s, encoding='utf-8')
    p.write_text(out, encoding='utf-8')
    print('patched', str(p))
    print('backup', str(backup))


if __name__ == '__main__':
    main()