from storage import vector_store


def chunk_text(text: str, chunk_size: int = 500, overlap: int = 50) -> list[str]:
    words = text.split()
    if len(words) <= chunk_size:
        return [text]
    chunks, start = [], 0
    while start < len(words):
        end = min(start + chunk_size, len(words))
        chunks.append(" ".join(words[start:end]))
        start += chunk_size - overlap
    return chunks


def clear_ticker_data(ticker: str) -> None:
    """Delete all existing chunks for a ticker from both Chroma collections."""
    vector_store.delete_by_ticker("filings", ticker)
    vector_store.delete_by_ticker("transcripts", ticker)


def embed_and_store_filing(
    ticker: str,
    company_name: str,
    mda_text: str,
    risk_text: str,
    filing_date: str,
    period: str,
    form_type: str,
    accession: str = "",
    source_url: str = "",
    document_id: str = "",
    business_text: str = "",
    segments_geography_text: str = "",
) -> None:
    ticker = ticker.upper()
    filing_document_id = document_id or f"sec:{ticker}:{accession or f'{form_type}:{period}:{filing_date}'}"
    sections = [
        ("MD&A", "mda", mda_text),
        ("Risk Factors", "risk_factors", risk_text),
        ("Business", "business", business_text),
        ("Segments & Geography", "segments_geography", segments_geography_text),
    ]
    for section, section_slug, text in sections:
        if not text.strip():
            print(f"WARNING: empty section '{section}' for {ticker} {period} ({form_type}) — Chroma chunk not written")
            continue
        chunks = chunk_text(text)
        total = len(chunks)
        chunk_ids = [f"{section_slug}:{i}" for i in range(total)]
        metadatas = [
            {
                "ticker": ticker,
                "company_name": company_name,
                "source": form_type,
                "filing_date": filing_date,
                "period": period,
                "section": section,
                "accession": accession,
                "source_url": source_url,
                "document_id": filing_document_id,
                "chunk_id": chunk_ids[i],
                "chunk_context": f"{company_name} | {form_type} {period} | {section} | Chunk {i + 1}/{total}",
            }
            for i in range(total)
        ]
        ids = [f"{ticker}-{form_type}-{period}-{section.replace(' ', '_')}-{i}" for i in range(total)]
        vector_store.add_chunks("filings", chunks, metadatas, ids)


def embed_and_store_transcript(
    ticker: str,
    company_name: str,
    transcript_text: str,
    transcript_date: str,
    period: str,
    source_url: str = "",
    document_id: str = "",
    provider: str = "alphavantage",
) -> None:
    ticker = ticker.upper()
    if not transcript_text.strip():
        return
    chunks = chunk_text(transcript_text)
    total = len(chunks)
    transcript_document_id = document_id or f"transcript:{ticker}:{period}:{transcript_date}"
    metadatas = [
        {
            "ticker": ticker,
            "company_name": company_name,
            "source": "transcript",
            "date": transcript_date,
            "period": period,
            "speaker": "mixed",
            "source_url": source_url,
            "provider": provider,
            "document_id": transcript_document_id,
            "chunk_id": f"transcript:{i}",
            "chunk_context": f"{company_name} | Earnings Call {period} | Chunk {i + 1}/{total}",
        }
        for i in range(total)
    ]
    ids = [f"{ticker}-transcript-{period}-{i}" for i in range(total)]
    vector_store.add_chunks("transcripts", chunks, metadatas, ids)