"""
매매일지 API 엔드포인트

- GET /: 최근 AI 생성 매매일지 목록
- GET /stats: 일지 통계 (전략별, 감정 분포)
- GET /{journal_id}: 특정 일지 상세
- POST /generate/{trade_id}: 특정 거래에 대한 일지 즉시 생성
"""
from fastapi import APIRouter, Depends, HTTPException, Query
from app.core.security import require_api_key
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, desc, func
from typing import Optional
from datetime import datetime, timezone
import logging


def _utc_iso(dt: datetime | None) -> str | None:
    """UTC naive datetime → ISO 8601 with +00:00 (JS가 UTC로 올바르게 파싱)"""
    if dt is None:
        return None
    return dt.replace(tzinfo=timezone.utc).isoformat()

from app.core.database import get_db
from app.models.models import TradeJournal, TradeHistory

logger = logging.getLogger(__name__)

router = APIRouter()


@router.get("")
async def list_journals(
    limit: int = Query(default=20, ge=1, le=100),
    offset: int = Query(default=0, ge=0),
    stock_code: Optional[str] = None,
    db: AsyncSession = Depends(get_db),
):
    """최근 AI 생성 매매일지 목록 조회"""
    try:
        query = select(TradeJournal).order_by(desc(TradeJournal.journal_date))
        if stock_code:
            query = query.where(TradeJournal.stock_code == stock_code)
        query = query.offset(offset).limit(limit)

        result = await db.execute(query)
        journals = result.scalars().all()

        return [
            {
                "id": j.id,
                "trade_id": j.trade_id,
                "stock_code": j.stock_code,
                "stock_name": j.stock_name,
                "journal_date": _utc_iso(j.journal_date) if j.journal_date else None,
                "content": j.content,
                "strategy_name": j.strategy_name,
                "mood": j.mood,
                "tags": j.tags,
                "created_at": _utc_iso(j.created_at),
            }
            for j in journals
        ]
    except Exception as e:
        logger.error(f"journals list error: {e}", exc_info=True)
        return []


@router.get("/stats")
async def get_journal_stats(db: AsyncSession = Depends(get_db)):
    """일지 통계: 전략별 / 감정별 분포."""
    try:
        result_mood = await db.execute(
            select(TradeJournal.mood, func.count(TradeJournal.id).label("cnt"))
            .group_by(TradeJournal.mood)
        )
        mood_dist = {row[0] or "unknown": row[1] for row in result_mood.fetchall()}

        result_strat = await db.execute(
            select(TradeJournal.strategy_name, func.count(TradeJournal.id).label("cnt"))
            .group_by(TradeJournal.strategy_name)
        )
        strat_dist = {row[0] or "unknown": row[1] for row in result_strat.fetchall()}

        total = sum(mood_dist.values())
        return {
            "total": total,
            "by_mood": mood_dist,
            "by_strategy": strat_dist,
        }
    except Exception as e:
        logger.error(f"journal stats error: {e}", exc_info=True)
        return {"total": 0, "by_mood": {}, "by_strategy": {}}


@router.post("/generate/{trade_id}", dependencies=[Depends(require_api_key)])
async def generate_journal_for_trade_id(
    trade_id: int,
    db: AsyncSession = Depends(get_db),
):
    """특정 완료 거래(trade_id)에 대해 템플릿 기반 매매일지를 즉시 생성."""
    from app.services.trade_analyzer import (
        analyze_performance,
        generate_journal_for_trade,
        create_journal_record,
    )
    # 기존 일지 확인
    existing = await db.execute(
        select(TradeJournal).where(TradeJournal.trade_id == trade_id)
    )
    if existing.scalar_one_or_none():
        raise HTTPException(status_code=409, detail="이미 일지가 존재합니다.")

    # 거래 조회
    trade_result = await db.execute(
        select(TradeHistory).where(TradeHistory.id == trade_id)
    )
    trade = trade_result.scalar_one_or_none()
    if not trade:
        raise HTTPException(status_code=404, detail="거래 이력을 찾을 수 없습니다.")
    if trade.order_type != "SELL" or trade.status not in ("COMPLETED", "FILLED"):
        raise HTTPException(status_code=400, detail="완료된 매도 거래에 대해서만 일지를 생성할 수 있습니다.")

    perf = await analyze_performance(db, days=30)
    content = generate_journal_for_trade(trade, perf)
    journal = await create_journal_record(db, trade, content)
    await db.commit()
    await db.refresh(journal)

    return {
        "id": journal.id,
        "trade_id": journal.trade_id,
        "stock_code": journal.stock_code,
        "stock_name": journal.stock_name,
        "journal_date": _utc_iso(journal.journal_date),
        "content": journal.content,
        "strategy_name": journal.strategy_name,
        "mood": journal.mood,
        "tags": journal.tags,
        "created_at": _utc_iso(journal.created_at),
    }


@router.get("/{journal_id}")
async def get_journal(journal_id: int, db: AsyncSession = Depends(get_db)):
    """특정 매매일지 상세 조회"""
    result = await db.execute(select(TradeJournal).where(TradeJournal.id == journal_id))
    journal = result.scalar_one_or_none()
    if not journal:
        raise HTTPException(status_code=404, detail="Journal not found")
    return {
        "id": journal.id,
        "trade_id": journal.trade_id,
        "stock_code": journal.stock_code,
        "stock_name": journal.stock_name,
        "journal_date": journal.journal_date.isoformat() if journal.journal_date else None,
        "content": journal.content,
        "strategy_name": journal.strategy_name,
        "mood": journal.mood,
        "tags": journal.tags,
        "created_at": journal.created_at.isoformat() if journal.created_at else None,
    }