"""Parser worker - HTML-to-text, boilerplate reduction, quality scoring.

Uses BeautifulSoup-based parsing pipeline for structured HTML extraction,
metadata extraction, outbound link extraction, and quality scoring.
Persists normalized text and structured parser output to MinIO,
and updates document metadata in PostgreSQL.

Requirements: 4.1, 4.2, 4.3, 9.1, 9.2
"""
import asyncio
import json
import logging
import time
from datetime import datetime, timezone
from typing import Any, Optional

import asyncpg
import httpx
import redis.asyncio as aioredis
from minio import Minio

from services.parser.html_parser import ParsedDocument, detect_company_mentions, parse_html
from services.shared.config import load_config
from services.shared.db import get_minio, get_pg_pool, get_redis
from services.shared.logging import Span, extract_trace_context, inject_trace_context, new_trace_id, set_trace_context, setup_logging
from services.shared.metrics import (
    ACTIVE_JOBS,
    PARSE_DURATION,
    PARSE_JOBS_TOTAL,
    PARSE_LOW_QUALITY_TOTAL,
    PARSE_QUALITY_SCORE,
)
from services.shared.metadata import update_document_parse_results
from services.shared.redis_keys import QUEUE_EXTRACTION, QUEUE_PARSING, queue_key
from services.shared.storage import upload_normalized_text, upload_parser_output

logger = logging.getLogger("parser_worker")


async def fetch_html(url: str) -> Optional[str]:
    """Fetch article HTML for scraping."""
    if not url:
        return None
    async with httpx.AsyncClient(timeout=30, follow_redirects=True) as client:
        try:
            resp = await client.get(url, headers={"User-Agent": "StonksOracle/1.0"})
            resp.raise_for_status()
            return resp.text
        except Exception as e:
            logger.warning(f"Failed to fetch {url}: {e}")
            return None


def build_parser_output_json(parsed: ParsedDocument, mentions: list[dict[str, Any]]) -> dict[str, Any]:
    """Build a structured JSON dict from ParsedDocument and detected mentions.

    This captures the full parser output for audit and downstream use:
    metadata, quality signals, warnings, outbound links, tags, and mentions.
    """
    return {
        "title": parsed.title,
        "author": parsed.author,
        "publisher": parsed.publisher,
        "published_at": parsed.published_at,
        "canonical_url": parsed.canonical_url,
        "language": parsed.language,
        "description": parsed.description,
        "document_type": parsed.document_type,
        "word_count": parsed.word_count,
        "outbound_links": parsed.outbound_links,
        "tags": parsed.tags,
        "quality_score": parsed.quality_score,
        "confidence": parsed.confidence,
        "low_quality_flag": parsed.low_quality_flag,
        "quality_warnings": parsed.quality_warnings,
        "quality_signals": parsed.quality_signals.as_dict(),
        "mentioned_companies": mentions,
    }


async def process_job(
    job: dict[str, Any],
    pool: asyncpg.Pool,
    rds: aioredis.Redis,
    minio_client: Minio,
) -> None:
    doc_id = job["document_id"]
    ticker = job["ticker"]
    url = job.get("url", "")
    now = datetime.now(timezone.utc)
    _parse_start = time.monotonic()

    set_trace_context(trace_id=job.get("_trace_id") or new_trace_id())

    # Fetch HTML if we have a URL
    html = await fetch_html(url) if url else None

    if html:
        # Parse using BeautifulSoup pipeline
        parsed = parse_html(html, url)
    else:
        parsed = ParsedDocument()

    text = parsed.body_text

    # Upload normalized text to MinIO
    norm_ref: str | None = None
    if text:
        norm_ref = upload_normalized_text(
            minio_client, ticker, doc_id,
            text.encode("utf-8"), timestamp=now,
        )

    # Detect company mentions
    aliases = await pool.fetch(
        """SELECT ca.company_id::text, ca.alias, ca.alias_type, c.ticker
           FROM company_aliases ca JOIN companies c ON ca.company_id = c.id
           UNION ALL
           SELECT c.id::text as company_id, c.ticker as alias, 'ticker' as alias_type, c.ticker
           FROM companies c
           UNION ALL
           SELECT c.id::text as company_id, c.legal_name as alias, 'legal_name' as alias_type, c.ticker
           FROM companies c"""
    )
    mentions = detect_company_mentions(text, [dict(a) for a in aliases]) if text else []

    # Build and upload structured parser output JSON
    output_json = build_parser_output_json(parsed, mentions)
    output_bytes = json.dumps(output_json, default=str, indent=2).encode("utf-8")
    parser_output_ref = upload_parser_output(
        minio_client, ticker, doc_id,
        output_bytes, timestamp=now,
    )

    # Update document in PostgreSQL
    status = "parsed" if parsed.confidence != "low" else "low_quality"
    await update_document_parse_results(
        pool,
        document_id=doc_id,
        normalized_storage_ref=norm_ref,
        parser_output_ref=parser_output_ref,
        parse_quality_score=parsed.quality_score,
        parse_confidence=parsed.confidence,
        status=status,
    )

    # Insert company mentions
    for m in mentions:
        await pool.execute(
            """INSERT INTO document_company_mentions (document_id, company_id, ticker, mention_type, confidence)
               VALUES ($1, $2, $3, $4, $5) ON CONFLICT DO NOTHING""",
            doc_id, m["company_id"], m["ticker"], m["mention_type"], m["confidence"],
        )

    # Only enqueue for extraction if quality is acceptable
    if parsed.confidence != "low":
        await rds.rpush(queue_key(QUEUE_EXTRACTION), json.dumps(inject_trace_context({
            "document_id": doc_id,
            "ticker": ticker,
            "normalized_text": text[:8000],
        })))
        PARSE_JOBS_TOTAL.labels(status="parsed").inc()
        PARSE_QUALITY_SCORE.observe(parsed.quality_score)
        PARSE_DURATION.observe(time.monotonic() - _parse_start)
        logger.info(
            "Parsed doc %s for %s: quality=%.2f, confidence=%s",
            doc_id, ticker, parsed.quality_score, parsed.confidence,
            extra={"ticker": ticker, "document_id": doc_id},
        )
    else:
        PARSE_JOBS_TOTAL.labels(status="low_quality").inc()
        PARSE_LOW_QUALITY_TOTAL.inc()
        PARSE_QUALITY_SCORE.observe(parsed.quality_score)
        PARSE_DURATION.observe(time.monotonic() - _parse_start)
        logger.warning(
            "Low quality parse for doc %s, skipping extraction",
            doc_id,
            extra={"ticker": ticker, "document_id": doc_id},
        )


async def main() -> None:
    config = load_config()
    setup_logging("parser_worker", level=config.log_level, json_output=config.json_logs)

    pool = await get_pg_pool(config)
    rds = get_redis(config)
    minio_client = get_minio(config)

    logger.info("Parser worker started")
    queue = queue_key(QUEUE_PARSING)

    try:
        while True:
            raw = await rds.lpop(queue)
            if raw:
                job = json.loads(raw)
                try:
                    await process_job(job, pool, rds, minio_client)
                except Exception as e:
                    logger.error("Parse error: %s", e, exc_info=True)
            else:
                await asyncio.sleep(2)
    finally:
        await pool.close()
        await rds.close()


if __name__ == "__main__":
    asyncio.run(main())