from collections import defaultdict
from datasets import Dataset, load_dataset

SOURCE = "divinity-library/thg-02"   # page-level dataset with OCR column
TARGET = "divinity-library/thg-03"
OCR_COLUMN = "markdown_glm_ocr"
PAGE_MARKERS = True   # insert <!-- page N --> between pages

# Drop the image column so no images are decoded
ds = load_dataset(SOURCE, split="train").select_columns(["source", "page", OCR_COLUMN])

pages = defaultdict(list)
for row in ds:
    pages[row["source"]].append((row["page"], row[OCR_COLUMN]))

docs = []
for source, items in sorted(pages.items()):
    items.sort(key=lambda x: x[0])
    failed = [p for p, text in items if text == "[OCR ERROR]"]
    if failed:
        print(f"WARNING {source}: OCR failed on pages {failed}")
    parts = [
        (f"<!-- page {p} -->\n" if PAGE_MARKERS else "") + text
        for p, text in items
    ]
    docs.append({
        "source": source,
        "num_pages": len(items),
        "markdown": "\n\n".join(parts),
    })

Dataset.from_list(docs).push_to_hub(TARGET, private=True)