"""일일 다이제스트 워커 — PostgreSQL/CalDAV 쿼리 → Markdown + SMTP

v1 scripts/pkm_daily_digest.py에서 포팅.
DEVONthink/OmniFocus → PostgreSQL/CalDAV 쿼리로 전환.
"""

import os
from datetime import datetime, timezone
from pathlib import Path

from sqlalchemy import func, select, text

from core.config import settings
from core.database import async_session
from core.utils import send_smtp_email, setup_logger
from models.document import Document
from models.queue import ProcessingQueue

logger = setup_logger("daily_digest")


async def run():
    """일일 다이제스트 생성 + 저장 + 발송"""
    today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
    sections = []

    async with async_session() as session:
        # ─── 1. 오늘 추가된 문서 ───
        added = await session.execute(
            select(Document.ai_domain, func.count(Document.id))
            .where(func.date(Document.created_at) == today)
            .group_by(Document.ai_domain)
        )
        added_rows = added.all()
        total_added = sum(row[1] for row in added_rows)

        section = f"## 오늘 추가된 문서 ({total_added}건)\n"
        if added_rows:
            for domain, count in added_rows:
                section += f"- {domain or '미분류'}: {count}건\n"
        else:
            section += "- 없음\n"
        sections.append(section)

        # ─── 2. 법령 변경 ───
        law_docs = await session.execute(
            select(Document.title)
            .where(
                Document.source_channel == "law_monitor",
                func.date(Document.created_at) == today,
            )
        )
        law_rows = law_docs.scalars().all()
        section = f"## 법령 변경 ({len(law_rows)}건)\n"
        if law_rows:
            for title in law_rows:
                section += f"- {title}\n"
        else:
            section += "- 변경 없음\n"
        sections.append(section)

        # ─── 3. 이메일 수집 ───
        email_count = await session.execute(
            select(func.count(Document.id))
            .where(
                Document.source_channel == "email",
                func.date(Document.created_at) == today,
            )
        )
        email_total = email_count.scalar() or 0
        sections.append(f"## 이메일 수집\n- {email_total}건 아카이브\n")

        # ─── 4. 처리 파이프라인 상태 ───
        queue_stats = await session.execute(
            text("""
                SELECT stage, status, COUNT(*)
                FROM processing_queue
                WHERE created_at > NOW() - INTERVAL '24 hours'
                GROUP BY stage, status
                ORDER BY stage, status
            """)
        )
        queue_rows = queue_stats.all()
        section = "## 파이프라인 상태 (24h)\n"
        if queue_rows:
            for stage, status, count in queue_rows:
                section += f"- {stage}/{status}: {count}건\n"
        else:
            section += "- 처리 항목 없음\n"

        # 실패 건수 강조
        failed = await session.execute(
            select(func.count())
            .select_from(ProcessingQueue)
            .where(
                ProcessingQueue.status == "failed",
                ProcessingQueue.created_at > text("NOW() - INTERVAL '24 hours'"),
            )
        )
        failed_count = failed.scalar() or 0
        if failed_count > 0:
            section += f"\n⚠️ **실패 {failed_count}건** — 수동 확인 필요\n"
        sections.append(section)

        # ─── 5. Inbox 미분류 ───
        inbox_count = await session.execute(
            select(func.count(Document.id))
            .where(Document.file_path.like("PKM/Inbox/%"))
        )
        inbox_total = inbox_count.scalar() or 0
        if inbox_total > 0:
            sections.append(f"## Inbox 미분류\n- {inbox_total}건 대기 중\n")

    # ─── Markdown 조합 ───
    date_display = datetime.now(timezone.utc).strftime("%Y년 %m월 %d일")
    markdown = f"# PKM 일일 다이제스트 — {date_display}\n\n"
    markdown += "\n".join(sections)
    markdown += f"\n---\n*생성: {datetime.now(timezone.utc).isoformat()}*\n"

    # ─── NAS 저장 ───
    digest_dir = Path(settings.nas_mount_path) / "PKM" / "Archive" / "digests"
    digest_dir.mkdir(parents=True, exist_ok=True)
    digest_path = digest_dir / f"{today}_digest.md"
    digest_path.write_text(markdown, encoding="utf-8")

    # ─── 90일 초과 아카이브 ───
    archive_dir = digest_dir / "archive"
    archive_dir.mkdir(exist_ok=True)
    cutoff = datetime.now(timezone.utc).timestamp() - (90 * 86400)
    for old in digest_dir.glob("*_digest.md"):
        if old.stat().st_mtime < cutoff:
            old.rename(archive_dir / old.name)

    # ─── SMTP 발송 ───
    smtp_host = os.getenv("MAILPLUS_HOST", "")
    smtp_port = int(os.getenv("MAILPLUS_SMTP_PORT", "465"))
    smtp_user = os.getenv("MAILPLUS_USER", "")
    smtp_pass = os.getenv("MAILPLUS_PASS", "")
    if smtp_host and smtp_user:
        send_smtp_email(
            smtp_host, smtp_port, smtp_user, smtp_pass,
            f"PKM 다이제스트 — {date_display}",
            markdown,
        )

    logger.info(f"다이제스트 생성 완료: {digest_path}")