"""dataClean FastAPI 入口"""
import logging
import os
from contextlib import asynccontextmanager
from datetime import datetime, timedelta, timezone
from typing import Optional, List

from fastapi import FastAPI, Depends, HTTPException, Query, Body, Security, status
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel, ConfigDict
from sqlalchemy.orm import Session

from config import settings
from database import init_db, get_db, SessionLocal
from scheduler import init_scheduler, stop_scheduler, get_scheduler, get_task_lock
from app.taxonomy import bootstrap_taxonomy, list_taxonomy, ensure_taxonomy
from app.summarizer import fetch_and_summarize
from app.tagger import tag_articles
from app.deduplicator import deduplicate_articles
from app.scorer import score_articles
from app.brief import generate_daily_brief
from app.settings_manager import (
    init_default_settings,
    list_settings,
    get_setting,
    set_setting,
    reset_settings,
    apply_db_settings_to_config,
)
from models import EnrichedArticle, DailyBrief, Taxonomy, DuplicateGroup, AppSetting

logging.basicConfig(
    level=getattr(logging, settings.LOG_LEVEL.upper(), logging.INFO),
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
)
logger = logging.getLogger(__name__)

# API Token 鉴权（当配置时启用）
security_scheme = HTTPBearer(auto_error=False)


def _get_allowed_origins() -> List[str]:
    """解析 CORS 允许来源配置"""
    raw = settings.CORS_ALLOWED_ORIGINS
    if raw:
        return [o.strip() for o in raw.split(",") if o.strip()]
    # 默认只允许同源（Docker/生产由反向代理或浏览器同源访问）
    return []


def verify_token(credentials: Optional[HTTPAuthorizationCredentials] = Security(security_scheme)):
    """验证 API Token；未配置时跳过鉴权"""
    token = settings.API_TOKEN
    if not token:
        return None
    if not credentials:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="缺少 Authorization 请求头",
            headers={"WWW-Authenticate": "Bearer"},
        )
    if credentials.scheme != "Bearer" or credentials.credentials != token:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="无效的 API Token",
        )
    return credentials.credentials


def _run_task_locked(func, db: Session):
    """带互斥锁执行任务"""
    acquired = get_task_lock().acquire(blocking=False)
    if not acquired:
        raise HTTPException(status_code=409, detail="已有任务正在执行，请稍后再试")
    try:
        return func(db)
    finally:
        get_task_lock().release()


@asynccontextmanager
async def lifespan(app: FastAPI):
    """应用生命周期管理"""
    logger.info("启动 dataClean 服务")
    init_db()

    db = SessionLocal()
    try:
        # 初始化默认配置
        init_default_settings(db)
        # 用数据库配置覆盖全局 settings
        apply_db_settings_to_config(db)
        # 首次启动时确保 taxonomy 表存在
        ensure_taxonomy(db)
    except Exception as exc:
        logger.error("启动初始化失败: %s", exc)
    finally:
        db.close()

    init_scheduler()
    yield
    stop_scheduler()


app = FastAPI(
    title="dataClean",
    description="RSS 数据清洗、摘要、分类、打分与简报生成服务",
    version="1.0.0",
    lifespan=lifespan,
)

# CORS 配置：生产环境收敛到具体域名，且不与 credentials=true 同时用通配符
_allowed_origins = _get_allowed_origins()
app.add_middleware(
    CORSMiddleware,
    allow_origins=_allowed_origins or ["*"],
    allow_credentials=bool(_allowed_origins),
    allow_methods=["*"],
    allow_headers=["*"],
)


# ---------- Pydantic 模型 ----------

class ArticleOut(BaseModel):
    id: int
    rk_article_id: int
    title: str
    link: str
    feed_title: str
    category: str
    tags: List[str]
    heat_score: float
    importance_score: float
    duplication_score: float
    composite_score: float
    ai_summary: str
    is_representative: bool
    published_at: Optional[str]

    model_config = ConfigDict(from_attributes=True)


class ArticleListOut(BaseModel):
    items: List[ArticleOut]
    total: int


class BriefOut(BaseModel):
    id: int
    brief_date: str
    total_articles: int
    unique_articles: int
    by_category: dict
    markdown_path: str

    model_config = ConfigDict(from_attributes=True)


class TaxonomyOut(BaseModel):
    id: int
    name: str
    kind: str
    description: str
    keywords: List[str]
    weight: float
    created_by_ai: bool

    model_config = ConfigDict(from_attributes=True)


class SettingOut(BaseModel):
    key: str
    value: str
    description: str
    is_sensitive: bool
    is_masked: bool
    updated_at: Optional[str]


class SettingUpdate(BaseModel):
    value: str


class BatchSettingsUpdate(BaseModel):
    settings: dict


class StatsOut(BaseModel):
    total_articles: int
    today_articles: int
    ai_summarized: int
    categories: int
    tags: int
    duplicate_groups: int
    briefs: int
    next_jobs: dict


# ---------- 健康检查 ----------

@app.get("/health")
def health():
    return {"status": "ok", "service": "dataClean"}


# ---------- 文章接口 ----------

@app.get("/api/articles", response_model=ArticleListOut)
def list_articles(
    date: Optional[str] = Query(None, description="日期 YYYY-MM-DD"),
    category: Optional[str] = Query(None),
    tag: Optional[str] = Query(None),
    representative_only: bool = Query(False, description="仅返回重复组代表文章"),
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    db: Session = Depends(get_db),
):
    query = db.query(EnrichedArticle)

    if date:
        day = datetime.strptime(date, "%Y-%m-%d")
        next_day = day + timedelta(days=1)
        query = query.filter(EnrichedArticle.fetched_at >= day, EnrichedArticle.fetched_at < next_day)
    if category:
        query = query.filter(EnrichedArticle.category == category)
    if tag:
        # SQLite JSON 列使用 json_each 做精确匹配，避免字符串子串误命中
        query = query.filter(
            EnrichedArticle.tags.contains([tag])
        )
    if representative_only:
        query = query.filter(
            (EnrichedArticle.is_representative == True) | (EnrichedArticle.duplicate_group_id == None)
        )

    total = query.count()
    items = query.order_by(EnrichedArticle.composite_score.desc()).offset(offset).limit(limit).all()
    return {"items": items, "total": total}


@app.get("/api/articles/{article_id}", response_model=ArticleOut)
def get_article(article_id: int, db: Session = Depends(get_db)):
    article = db.query(EnrichedArticle).filter(EnrichedArticle.id == article_id).first()
    if not article:
        raise HTTPException(status_code=404, detail="文章不存在")
    return article


# ---------- 简报接口 ----------

@app.get("/api/briefs", response_model=List[BriefOut])
def list_briefs(
    limit: int = Query(30, ge=1, le=100),
    db: Session = Depends(get_db),
):
    return (
        db.query(DailyBrief)
        .order_by(DailyBrief.brief_date.desc())
        .limit(limit)
        .all()
    )


@app.get("/api/briefs/{date}", response_model=BriefOut)
def get_brief(date: str, db: Session = Depends(get_db)):
    brief = db.query(DailyBrief).filter(DailyBrief.brief_date == date).first()
    if not brief:
        raise HTTPException(status_code=404, detail="简报不存在")
    return brief


@app.post("/api/briefs/{date}/regenerate")
def regenerate_brief(date: str, db: Session = Depends(get_db), _=Depends(verify_token)):
    try:
        data = generate_daily_brief(db, date_str=date, force=True)
        return {"message": "简报已重新生成", "data": data}
    except Exception as exc:
        logger.error("重新生成简报失败: %s", exc)
        raise HTTPException(status_code=500, detail=str(exc))


# ---------- 分类体系接口 ----------

@app.get("/api/taxonomy", response_model=List[TaxonomyOut])
def get_taxonomy(kind: Optional[str] = Query(None), db: Session = Depends(get_db)):
    return list_taxonomy(db, kind=kind)


@app.post("/api/taxonomy/bootstrap")
def trigger_taxonomy_bootstrap(
    force: bool = False,
    db: Session = Depends(get_db),
    _=Depends(verify_token),
):
    ok = bootstrap_taxonomy(db, force=force)
    if not ok:
        return {"message": "taxonomy 已存在或初始化失败，请检查日志"}
    return {"message": "taxonomy 初始化成功"}


# ---------- 手动触发任务接口 ----------

@app.post("/api/tasks/summarize")
def task_summarize(db: Session = Depends(get_db), _=Depends(verify_token)):
    stats = _run_task_locked(lambda session: fetch_and_summarize(session, hours=24, limit=200), db)
    return {"message": "摘要任务完成", "stats": stats}


@app.post("/api/tasks/tag-score-dedup")
def task_tag_score_dedup(db: Session = Depends(get_db), _=Depends(verify_token)):
    def _run(session):
        tag_articles(session)
        today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
        deduplicate_articles(session, date_str=today)
        score_articles(session, update_duplication=True)
        return None
    _run_task_locked(_run, db)
    return {"message": "分类/去重/打分任务完成"}


@app.post("/api/tasks/brief")
def task_brief(db: Session = Depends(get_db), _=Depends(verify_token)):
    def _run(session):
        today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
        return generate_daily_brief(session, date_str=today, force=True)
    data = _run_task_locked(_run, db)
    return {"message": "简报生成任务完成", "data": data}


# ---------- 配置管理接口 ----------

@app.get("/api/settings", response_model=List[SettingOut])
def get_settings(db: Session = Depends(get_db), _=Depends(verify_token)):
    return list_settings(db, mask_sensitive=True)


@app.put("/api/settings/{key}")
def update_setting(
    key: str,
    body: SettingUpdate,
    db: Session = Depends(get_db),
    _=Depends(verify_token),
):
    ok = set_setting(db, key, body.value)
    if not ok:
        raise HTTPException(status_code=400, detail="无效的配置项")
    return {"message": "配置已保存，重启服务后生效"}


@app.put("/api/settings")
def update_settings_batch(
    body: BatchSettingsUpdate,
    db: Session = Depends(get_db),
    _=Depends(verify_token),
):
    errors = []
    for key, value in body.settings.items():
        if not set_setting(db, key, value):
            errors.append(key)
    if errors:
        raise HTTPException(status_code=400, detail=f"以下配置项无效: {', '.join(errors)}")
    return {"message": "配置已保存，重启服务后生效"}


@app.post("/api/settings/reset")
def reset_all_settings(db: Session = Depends(get_db), _=Depends(verify_token)):
    reset_settings(db)
    return {"message": "配置已重置为环境变量默认值，重启服务后生效"}


# ---------- 仪表盘统计接口 ----------

@app.get("/api/stats", response_model=StatsOut)
def get_stats(db: Session = Depends(get_db)):
    today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
    day_start = datetime.strptime(today, "%Y-%m-%d")
    day_end = day_start + timedelta(days=1)

    total_articles = db.query(EnrichedArticle).count()
    today_articles = (
        db.query(EnrichedArticle)
        .filter(EnrichedArticle.fetched_at >= day_start, EnrichedArticle.fetched_at < day_end)
        .count()
    )
    ai_summarized = db.query(EnrichedArticle).filter(EnrichedArticle.ai_summary != "").count()
    categories = db.query(Taxonomy).filter(Taxonomy.kind == "category").count()
    tags = db.query(Taxonomy).filter(Taxonomy.kind == "tag").count()
    duplicate_groups = db.query(DuplicateGroup).count()
    briefs = db.query(DailyBrief).count()

    scheduler = get_scheduler()
    next_jobs = {}
    for job in scheduler.get_jobs():
        next_jobs[job.id] = job.next_run_time.isoformat() if job.next_run_time else None

    return {
        "total_articles": total_articles,
        "today_articles": today_articles,
        "ai_summarized": ai_summarized,
        "categories": categories,
        "tags": tags,
        "duplicate_groups": duplicate_groups,
        "briefs": briefs,
        "next_jobs": next_jobs,
    }


# ---------- 静态文件托管（生产环境） ----------

static_dir = os.path.join(os.path.dirname(__file__), "static")
if not os.path.isdir(static_dir):
    # 本地构建时 frontend/dist 也可作为静态文件源
    frontend_dist = os.path.join(os.path.dirname(__file__), "frontend", "dist")
    if os.path.isdir(frontend_dist):
        static_dir = frontend_dist

if os.path.isdir(static_dir):
    app.mount("/", StaticFiles(directory=static_dir, html=True), name="static")


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7331)