feat: add comparison stats api (/plants/stats/comparison)

app/routers/stats.py

@@ -5,8 +5,10 @@
 
 from fastapi import APIRouter, HTTPException, Depends, Query
 from supabase import Client
-from typing import List, Literal
+from typing import List, Literal, Optional
 from datetime import datetime, timedelta, timezone
+import calendar
+import re
 
 from app.core.database import get_db
 
@@ -16,6 +18,165 @@ router = APIRouter(
 )
 
 
+@router.get("/stats/comparison")
+async def get_all_plants_comparison(
+    period: Literal["day", "month", "year"] = Query("day", description="통계 기간"),
+    date: Optional[str] = Query(None, description="날짜 (YYYY-MM-DD)"),
+    year: Optional[int] = Query(None, description="연도"),
+    month: Optional[int] = Query(None, description="월"),
+    db: Client = Depends(get_db)
+) -> dict:
+    """
+    전체 발전소 발전량 비교 통계 조회
+    """
+    try:
+        # 1. 모든 발전소 기본 정보 조회 (이름, 용량)
+        plants_res = db.table("plants").select("id, name, capacity").execute()
+        plants = {p['id']: p for p in plants_res.data}
+        
+        # 결과 초기화
+        result_data = []
+        
+        # 날짜 파라미터 처리
+        # KST 시간대 고려
+        kst_timezone = timezone(timedelta(hours=9))
+        now_kst = datetime.now(kst_timezone)
+        today = now_kst.date()
+        
+        target_date = None
+        if date:
+            try:
+                target_date = datetime.strptime(date, "%Y-%m-%d").date()
+            except ValueError:
+                target_date = today
+        else:
+            target_date = today
+
+        target_year = year if year else target_date.year
+        target_month = month if month else target_date.month
+
+        # 데이터 조회 로직
+        stats_map = {} # plant_id -> generation
+
+        if period == "day":
+            date_str = target_date.isoformat()
+            
+            # (A) 오늘 날짜인 경우: solar_logs 최신값 (실시간)
+            # 서버 시간대와 클라이언트 요청 날짜 일치 여부 확인
+            if target_date == today:
+                # 오늘 00:00:00 (KST) 이후 데이터 조회
+                start_dt = f"{date_str}T00:00:00"
+                
+                # solar_logs에서 오늘 생성된 데이터 조회
+                logs_res = db.table("solar_logs") \
+                    .select("plant_id, today_kwh") \
+                    .gte("created_at", start_dt) \
+                    .order("created_at", desc=True) \
+                    .execute()
+                
+                # plant_id별로 첫 번째(최신) 값만 취함
+                seen_plants = set()
+                for log in logs_res.data:
+                    pid = log['plant_id']
+                    if pid not in seen_plants:
+                        val = log.get('today_kwh', 0)
+                        if val is None: val = 0
+                        stats_map[pid] = val
+                        seen_plants.add(pid)
+            else:
+                # 과거: daily_stats 조회
+                daily_res = db.table("daily_stats") \
+                    .select("plant_id, total_generation") \
+                    .eq("date", date_str) \
+                    .execute()
+                
+                for row in daily_res.data:
+                    val = row.get('total_generation', 0)
+                    if val is None: val = 0
+                    stats_map[row['plant_id']] = val
+        
+        elif period == "month":
+            # 월간: monthly_stats 조회 (해당 월)
+            month_str = f"{target_year}-{target_month:02d}"
+            
+            monthly_res = db.table("monthly_stats") \
+                .select("plant_id, total_generation") \
+                .eq("month", month_str) \
+                .execute()
+                
+            for row in monthly_res.data:
+                val = row.get('total_generation', 0)
+                if val is None: val = 0
+                stats_map[row['plant_id']] = val
+                
+        elif period == "year":
+            # 연간: monthly_stats 조회 (해당 연도 전체 합산)
+            start_month = f"{target_year}-01"
+            end_month = f"{target_year}-12"
+            
+            monthly_res = db.table("monthly_stats") \
+                .select("plant_id, total_generation") \
+                .gte("month", start_month) \
+                .lte("month", end_month) \
+                .execute()
+            
+            # 합산
+            for row in monthly_res.data:
+                pid = row['plant_id']
+                val = row.get('total_generation', 0)
+                if val is None: val = 0
+                stats_map[pid] = stats_map.get(pid, 0) + val
+
+        # 결과 조합
+        for pid, p_info in plants.items():
+            gen = stats_map.get(pid, 0) or 0
+            cap = p_info.get('capacity', 0) or 0
+            
+            # 발전시간 계산
+            gen_hours = 0
+            if cap > 0:
+                if period == "day":
+                    gen_hours = gen / cap
+                elif period == "month":
+                    # 해당 월의 일수 (일평균 발전시간)
+                    days_in_month = calendar.monthrange(target_year, target_month)[1]
+                    gen_hours = (gen / cap) / days_in_month
+                elif period == "year":
+                    # 연간 일평균 발전시간 (/365)
+                    gen_hours = (gen / cap) / 365
+            
+            result_data.append({
+                "plant_id": pid,
+                "plant_name": p_info['name'],
+                "capacity": cap,
+                "generation": round(gen, 2),
+                "generation_hours": round(gen_hours, 2)
+            })
+            
+        # 발전소 이름 순 정렬 (호기 추출)
+        def sort_key(item):
+            match = re.search(r'(\d+)호기', item['plant_name'])
+            if match:
+                return int(match.group(1))
+            return 999
+            
+        result_data.sort(key=sort_key)
+
+        return {
+            "status": "success",
+            "period": period,
+            "target_date": target_date.isoformat(),
+            "data": result_data,
+            "count": len(result_data)
+        }
+
+    except Exception as e:
+        raise HTTPException(
+            status_code=500,
+            detail=f"전체 통계 조회 실패: {str(e)}"
+        )
+
+
 @router.get("/{plant_id}/stats")
 async def get_plant_stats(
     plant_id: str,