# app/api/endpoints/events.py
from fastapi import APIRouter, Depends, Query
from sqlalchemy.orm import Session
from datetime import timedelta
from typing import List

from app.api.dependencies import get_db
from app.models.models import UnifiedEvent, TrendingEvent, InfoSource, RankingLog, utcnow
# 导入你上传的 Schema
from app.schemas.event_schema import UnifiedEventResponse, PlatformTrendResponse

router = APIRouter()


@router.get("/unified", response_model=List[UnifiedEventResponse])
def list_unified_events(
        min_hot: int = Query(5, description="热度过滤阈值"),
        hours: int = Query(24, description="查询过去 X 小时的数据"),
        db: Session = Depends(get_db)
):
    """
    获取聚合大事件列表，完全适配前端 template.html 所需的数据结构
    """
    # 计算时间水位线
    time_limit = utcnow() - timedelta(hours=hours)

    # 1. 查询大事件（按热度降序，且满足时间范围）
    events = db.query(UnifiedEvent).filter(
        UnifiedEvent.hot_score >= min_hot,
        UnifiedEvent.created_at >= time_limit
    ).order_by(UnifiedEvent.hot_score.desc()).all()

    results = []
    for ev in events:
        # 2. 联表查询：获取该大事件下关联的所有平台及其具体热搜信息
        trends = db.query(TrendingEvent, InfoSource.source_name).join(
            InfoSource, TrendingEvent.source_id == InfoSource.id
        ).filter(TrendingEvent.unified_event_id == ev.id).all()

        platform_list = []
        for trend, s_name in trends:
            # 3. 获取排名历史轨迹 (用于前端渲染)
            # 这里的排序顺序 asc 保证了数组从旧到新
            logs = db.query(RankingLog.ranking_position).filter(
                RankingLog.event_id == trend.id,
                RankingLog.observed_at >= time_limit
            ).order_by(RankingLog.observed_at.asc()).all()

            # 组装符合 PlatformTrendResponse 结构的字典
            platform_list.append(PlatformTrendResponse(
                source_id=trend.source_id,
                platform_name=s_name,
                headline=trend.current_headline,
                url=trend.event_url,
                current_ranking=trend.current_ranking,
                ranking_history=[log[0] for log in logs]
            ))

        # 4. 组装符合 UnifiedEventResponse 结构的字典
        results.append(UnifiedEventResponse(
            event_id=ev.id,
            unified_title=ev.unified_title if ev.unified_title else "暂无标题",
            summary=ev.ai_comprehensive_summary,
            hot_score=ev.hot_score,
            created_at=ev.created_at,
            platforms=platform_list
        ))

    return results