"""대시보드 위젯 데이터 API"""

from typing import Annotated

from fastapi import APIRouter, Depends
from pydantic import BaseModel
from sqlalchemy import func, select, text
from sqlalchemy.ext.asyncio import AsyncSession

from core.auth import get_current_user
from core.database import get_session
from models.document import Document
from models.queue import ProcessingQueue
from models.user import User

router = APIRouter()


class DomainCount(BaseModel):
    domain: str | None
    count: int


class RecentDocument(BaseModel):
    id: int
    title: str | None
    file_format: str
    ai_domain: str | None
    created_at: str


class PipelineStatus(BaseModel):
    stage: str
    status: str
    count: int


class DashboardResponse(BaseModel):
    today_added: int
    today_by_domain: list[DomainCount]
    inbox_count: int
    law_alerts: int
    recent_documents: list[RecentDocument]
    pipeline_status: list[PipelineStatus]
    failed_count: int
    total_documents: int
    # 카운트 분리: 문서함(비-note/비-news) / 메모(memo+note) / 뉴스(news)
    documents_count: int = 0
    memos_count: int = 0
    news_count: int = 0


@router.get("/", response_model=DashboardResponse)
async def get_dashboard(
    user: Annotated[User, Depends(get_current_user)],
    session: Annotated[AsyncSession, Depends(get_session)],
):
    """대시보드 위젯 데이터 집계"""

    # 오늘 추가된 문서
    today_result = await session.execute(
        select(Document.ai_domain, func.count(Document.id))
        .where(func.date(Document.created_at) == func.current_date())
        .group_by(Document.ai_domain)
    )
    today_rows = today_result.all()
    today_added = sum(row[1] for row in today_rows)

    # Inbox 미분류 수 (review_status = pending)
    inbox_result = await session.execute(
        select(func.count(Document.id))
        .where(
            Document.review_status == "pending",
            Document.deleted_at == None,
        )
    )
    inbox_count = inbox_result.scalar() or 0

    # 법령 알림 (오늘)
    law_result = await session.execute(
        select(func.count(Document.id))
        .where(
            Document.source_channel == "law_monitor",
            func.date(Document.created_at) == func.current_date(),
        )
    )
    law_alerts = law_result.scalar() or 0

    # 최근 문서 7건
    recent_result = await session.execute(
        select(Document)
        .order_by(Document.created_at.desc())
        .limit(7)
    )
    recent_docs = recent_result.scalars().all()

    # 파이프라인 상태 (24h)
    pipeline_result = await session.execute(
        text("""
            SELECT stage, status, COUNT(*)
            FROM processing_queue
            WHERE created_at > NOW() - INTERVAL '24 hours'
            GROUP BY stage, status
        """)
    )

    # 실패 건수
    failed_result = await session.execute(
        select(func.count())
        .select_from(ProcessingQueue)
        .where(ProcessingQueue.status == "failed")
    )
    failed_count = failed_result.scalar() or 0

    # 전체 문서 수 + 카테고리별 분리 (단일 쿼리)
    # 문서함: 비-note, 비-news / 메모: memo+note / 뉴스: news 유입 경로 기준
    count_result = await session.execute(
        text("""
            SELECT
                COUNT(*) AS total,
                COUNT(*) FILTER (WHERE source_channel != 'news' AND file_type != 'note') AS documents,
                COUNT(*) FILTER (WHERE source_channel = 'memo' AND file_type = 'note') AS memos,
                COUNT(*) FILTER (WHERE source_channel = 'news') AS news
            FROM documents WHERE deleted_at IS NULL
        """)
    )
    counts = count_result.one()
    total_documents = counts[0]
    documents_count = counts[1]
    memos_count = counts[2]
    news_count = counts[3]

    return DashboardResponse(
        today_added=today_added,
        today_by_domain=[
            DomainCount(domain=row[0], count=row[1]) for row in today_rows
        ],
        inbox_count=inbox_count,
        law_alerts=law_alerts,
        recent_documents=[
            RecentDocument(
                id=doc.id,
                title=doc.title,
                file_format=doc.file_format,
                ai_domain=doc.ai_domain,
                created_at=doc.created_at.isoformat() if doc.created_at else "",
            )
            for doc in recent_docs
        ],
        pipeline_status=[
            PipelineStatus(stage=row[0], status=row[1], count=row[2])
            for row in pipeline_result
        ],
        failed_count=failed_count,
        total_documents=total_documents,
        documents_count=documents_count,
        memos_count=memos_count,
        news_count=news_count,
    )