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"""Validate annotation counts, label distributions, and local resources."""

from __future__ import annotations

import json
import sqlite3
import sys
from collections import Counter
from pathlib import Path

from load_armbench_vl import iter_document_pages, load_records, resolve_images


def main(root: Path) -> None:
    config = json.loads((root / "dataset_config.json").read_text(encoding="utf-8"))
    errors: list[str] = []

    for task, expected in config.items():
        records = load_records(root, task)
        if len(records) != expected["expected_examples"]:
            errors.append(
                f"{task}: expected {expected['expected_examples']} examples, "
                f"found {len(records)}"
            )

        actual_tags = Counter(record.get("rm_tag") for record in records)
        if dict(actual_tags) != expected["rm_tag_counts"]:
            errors.append(
                f"{task}: expected rm_tag counts {expected['rm_tag_counts']}, "
                f"found {dict(actual_tags)}"
            )

        for record in records:
            for image in resolve_images(root, task, record):
                if not image.is_file():
                    errors.append(f"{task}: missing image {image}")

        if task == "multimodal_long_document_qa":
            doc_ids = {record["doc_id"] for record in records}
            for doc_id in doc_ids:
                if not list(iter_document_pages(root, doc_id)):
                    errors.append(f"{task}: no retrieval pages for {doc_id}")

            index_db = root / expected["retrieval_index"] / "chroma.sqlite3"
            if not index_db.is_file():
                errors.append(f"{task}: missing retrieval index {index_db}")
            else:
                connection = sqlite3.connect(f"file:{index_db}?mode=ro", uri=True)
                collections = {
                    row[0] for row in connection.execute("SELECT name FROM collections")
                }
                if expected["retrieval_collection"] not in collections:
                    errors.append(
                        f"{task}: missing Chroma collection "
                        f"{expected['retrieval_collection']}"
                    )
                indexed_docs = {
                    row[0]
                    for row in connection.execute(
                        "SELECT DISTINCT string_value FROM embedding_metadata "
                        "WHERE key = 'source'"
                    )
                }
                expected_docs = {Path(doc_id).stem for doc_id in doc_ids}
                missing_docs = expected_docs - indexed_docs
                if missing_docs:
                    errors.append(
                        f"{task}: {len(missing_docs)} documents are missing from "
                        "the retrieval index"
                    )
                connection.close()

        print(f"validated {task}: {len(records)} examples")

    if errors:
        print("\n".join(errors[:100]), file=sys.stderr)
        raise SystemExit(f"validation failed with {len(errors)} error(s)")
    print("ARMBench-VL validation passed: 1,499 examples")


if __name__ == "__main__":
    main(Path(sys.argv[1] if len(sys.argv) > 1 else ".").resolve())