#!/usr/bin/env python3
"""Copy 10 batches of EN/en-ES/en-EU JSON or JSONL into original_input/."""
from pathlib import Path
import argparse, shutil, sys

LANGUAGES = ('EN', 'en-ES', 'en-EU')

def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('source', type=Path)
    parser.add_argument('--output', type=Path, default=Path('original_input'))
    parser.add_argument('--batches', type=int, default=10)
    parser.add_argument('--overwrite', action='store_true')
    args = parser.parse_args()
    if not args.source.is_dir():
        parser.error(f'Not a directory: {args.source}')
    if args.batches < 1:
        parser.error('--batches must be at least 1')
    copied = skipped = 0
    missing = []
    errors = []
    for n in range(1, args.batches + 1):
        bid = f'{n:03d}'
        folder = args.output / f'batch_{bid}'
        folder.mkdir(parents=True, exist_ok=True)
        for lang in LANGUAGES:
            stem = f'MT_arxiv_crx_batch_{bid}_{lang}'
            candidates = [args.source / f'{stem}.{ext}' for ext in ('json','jsonl')]
            found = [p for p in candidates if p.is_file()]
            if len(found) != 1:
                if not found: missing.append(stem)
                else: errors.append(f'Ambiguous extensions: {stem}')
                continue
            target = folder / found[0].name
            if target.exists() and not args.overwrite:
                skipped += 1
                continue
            try:
                shutil.copy2(found[0], target)
                copied += 1
            except OSError as exc:
                errors.append(f'{stem}: {exc}')
    print(f'Expected: {args.batches * 3}, copied: {copied}, skipped: {skipped}, missing: {len(missing)}, errors: {len(errors)}')
    for f in missing: print(f'MISSING {f}.json/.jsonl', file=sys.stderr)
    for e in errors: print(f'ERROR {e}', file=sys.stderr)
    return 1 if missing or errors else 0

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