"""
구매신청 관리 API
"""
from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.responses import FileResponse
from pydantic import BaseModel
from sqlalchemy import text
from sqlalchemy.orm import Session
from typing import Optional, List, Dict
from datetime import datetime
import os
import json

from ..database import get_db
from ..auth.middleware import get_current_user
from ..utils.logger import get_logger

logger = get_logger(__name__)

router = APIRouter(prefix="/purchase-request", tags=["Purchase Request"])

# 엑셀 파일 저장 경로
EXCEL_DIR = "exports"
os.makedirs(EXCEL_DIR, exist_ok=True)

class PurchaseRequestCreate(BaseModel):
    file_id: int
    job_no: Optional[str] = None
    category: Optional[str] = None
    material_ids: List[int] = []
    materials_data: List[Dict] = []
    grouped_materials: Optional[List[Dict]] = []  # 그룹화된 자재 정보

@router.post("/create")
async def create_purchase_request(
    request_data: PurchaseRequestCreate,
    # current_user: dict = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    구매신청 생성 (엑셀 내보내기 = 구매신청)
    """
    try:
        # 구매신청 번호 생성
        today = datetime.now().strftime('%Y%m%d')
        count_query = text("""
            SELECT COUNT(*) as count
            FROM purchase_requests
            WHERE request_no LIKE :pattern
        """)
        count = db.execute(count_query, {"pattern": f"PR-{today}%"}).fetchone().count
        request_no = f"PR-{today}-{str(count + 1).zfill(3)}"
        
        # 자재 데이터를 JSON 파일로 저장 (나중에 재다운로드 시 사용)
        json_filename = f"{request_no}.json"
        json_path = os.path.join(EXCEL_DIR, json_filename)
        save_materials_data(
            request_data.materials_data, 
            json_path, 
            request_no, 
            request_data.job_no,
            request_data.grouped_materials  # 그룹화 정보 추가
        )
        
        # 구매신청 레코드 생성
        insert_request = text("""
            INSERT INTO purchase_requests (
                request_no, file_id, job_no, category, 
                material_count, excel_file_path, requested_by
            ) VALUES (
                :request_no, :file_id, :job_no, :category,
                :material_count, :excel_path, :requested_by
            ) RETURNING request_id
        """)
        
        result = db.execute(insert_request, {
            "request_no": request_no,
            "file_id": request_data.file_id,
            "job_no": request_data.job_no,
            "category": request_data.category,
            "material_count": len(request_data.material_ids),
            "excel_path": json_filename,
            "requested_by": 1  # current_user.get("user_id")
        })
        request_id = result.fetchone().request_id
        
        # 구매신청 자재 상세 저장
        logger.info(f"Processing {len(request_data.material_ids)} material IDs for purchase request {request_no}")
        logger.info(f"First 10 Material IDs: {request_data.material_ids[:10]}")  # 처음 10개만 로그
        logger.info(f"Category: {request_data.category}, Job: {request_data.job_no}")
        
        inserted_count = 0
        for i, material_id in enumerate(request_data.material_ids):
            material_data = request_data.materials_data[i] if i < len(request_data.materials_data) else {}
            
            # 이미 구매신청된 자재인지 확인
            check_existing = text("""
                SELECT 1 FROM purchase_request_items 
                WHERE material_id = :material_id
            """)
            existing = db.execute(check_existing, {"material_id": material_id}).fetchone()
            
            if not existing:
                insert_item = text("""
                    INSERT INTO purchase_request_items (
                        request_id, material_id, quantity, unit, user_requirement
                    ) VALUES (
                        :request_id, :material_id, :quantity, :unit, :user_requirement
                    )
                """)
                # quantity를 정수로 변환 (소수점 제거)
                quantity_str = str(material_data.get("quantity", 0))
                try:
                    quantity = int(float(quantity_str))
                except (ValueError, TypeError):
                    quantity = 0
                    
                db.execute(insert_item, {
                    "request_id": request_id,
                    "material_id": material_id,
                    "quantity": quantity,
                    "unit": material_data.get("unit", ""),
                    "user_requirement": material_data.get("user_requirement", "")
                })
                inserted_count += 1
            else:
                logger.warning(f"Material {material_id} already in another purchase request, skipping")
        
        db.commit()
        
        logger.info(f"Purchase request created: {request_no} with {inserted_count} materials (out of {len(request_data.material_ids)} requested)")
        
        # 실제 저장된 자재 확인
        verify_query = text("""
            SELECT COUNT(*) as count FROM purchase_request_items WHERE request_id = :request_id
        """)
        verified_count = db.execute(verify_query, {"request_id": request_id}).fetchone().count
        logger.info(f"✅ DB 검증: purchase_request_items에 {verified_count}개 저장됨")
        
        return {
            "success": True,
            "request_no": request_no,
            "request_id": request_id,
            "material_count": len(request_data.material_ids),
            "inserted_count": inserted_count,
            "verified_count": verified_count,
            "message": f"구매신청 {request_no}이 생성되었습니다"
        }
        
    except Exception as e:
        db.rollback()
        logger.error(f"Failed to create purchase request: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"구매신청 생성 실패: {str(e)}"
        )


@router.get("/list")
async def get_purchase_requests(
    file_id: Optional[int] = None,
    job_no: Optional[str] = None,
    status: Optional[str] = None,
    # current_user: dict = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    구매신청 목록 조회
    """
    try:
        query = text("""
            SELECT 
                pr.request_id,
                pr.request_no,
                pr.file_id,
                pr.job_no,
                pr.category,
                pr.material_count,
                pr.excel_file_path,
                pr.requested_at,
                pr.status,
                u.name as requested_by,
                f.original_filename,
                j.job_name,
                COUNT(pri.item_id) as item_count
            FROM purchase_requests pr
            LEFT JOIN users u ON pr.requested_by = u.user_id
            LEFT JOIN files f ON pr.file_id = f.id
            LEFT JOIN jobs j ON pr.job_no = j.job_no
            LEFT JOIN purchase_request_items pri ON pr.request_id = pri.request_id
            WHERE 1=1
                AND (:file_id IS NULL OR pr.file_id = :file_id)
                AND (:job_no IS NULL OR pr.job_no = :job_no)
                AND (:status IS NULL OR pr.status = :status)
            GROUP BY 
                pr.request_id, pr.request_no, pr.file_id, pr.job_no,
                pr.category, pr.material_count, pr.excel_file_path,
                pr.requested_at, pr.status, u.name, f.original_filename, j.job_name
            ORDER BY pr.requested_at DESC
        """)
        
        results = db.execute(query, {
            "file_id": file_id,
            "job_no": job_no,
            "status": status
        }).fetchall()
        
        requests = []
        for row in results:
            requests.append({
                "request_id": row.request_id,
                "request_no": row.request_no,
                "file_id": row.file_id,
                "job_no": row.job_no,
                "job_name": row.job_name,
                "category": row.category,
                "material_count": row.material_count,
                "item_count": row.item_count,
                "excel_file_path": row.excel_file_path,
                "requested_at": row.requested_at.isoformat() if row.requested_at else None,
                "status": row.status,
                "requested_by": row.requested_by,
                "source_file": row.original_filename
            })
        
        return {
            "success": True,
            "requests": requests,
            "count": len(requests)
        }
        
    except Exception as e:
        logger.error(f"Failed to get purchase requests: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"구매신청 목록 조회 실패: {str(e)}"
        )


@router.get("/{request_id}/materials")
async def get_request_materials(
    request_id: int,
    # current_user: dict = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    구매신청에 포함된 자재 목록 조회 (그룹화 정보 포함)
    """
    try:
        # 구매신청 정보 조회하여 JSON 파일 경로 가져오기
        info_query = text("""
            SELECT excel_file_path 
            FROM purchase_requests 
            WHERE request_id = :request_id
        """)
        info_result = db.execute(info_query, {"request_id": request_id}).fetchone()
        
        grouped_materials = []
        if info_result and info_result.excel_file_path:
            json_path = os.path.join(EXCEL_DIR, info_result.excel_file_path)
            if os.path.exists(json_path):
                with open(json_path, 'r', encoding='utf-8') as f:
                    data = json.load(f)
                    grouped_materials = data.get("grouped_materials", [])
        
        # 개별 자재 정보 조회 (기존 코드)
        query = text("""
            SELECT 
                pri.item_id,
                pri.material_id,
                pri.quantity as requested_quantity,
                pri.unit as requested_unit,
                pri.user_requirement,
                pri.is_ordered,
                pri.is_received,
                m.original_description,
                m.classified_category,
                m.size_spec,
                m.schedule,
                m.material_grade,
                m.quantity as original_quantity,
                m.unit as original_unit
            FROM purchase_request_items pri
            JOIN materials m ON pri.material_id = m.id
            WHERE pri.request_id = :request_id
            ORDER BY m.classified_category, m.original_description
        """)
        
        results = db.execute(query, {"request_id": request_id}).fetchall()
        
        materials = []
        for row in results:
            # quantity를 정수로 변환 (소수점 제거)
            qty = row.requested_quantity or row.original_quantity
            try:
                qty_int = int(float(qty)) if qty else 0
            except (ValueError, TypeError):
                qty_int = 0
                
            materials.append({
                "item_id": row.item_id,
                "material_id": row.material_id,
                "description": row.original_description,
                "category": row.classified_category,
                "size": row.size_spec,
                "schedule": row.schedule,
                "material_grade": row.material_grade,
                "quantity": qty_int,  # 정수로 변환
                "unit": row.requested_unit or row.original_unit,
                "user_requirement": row.user_requirement,
                "is_ordered": row.is_ordered,
                "is_received": row.is_received
            })
        
        return {
            "success": True,
            "materials": materials,
            "grouped_materials": grouped_materials,  # 그룹화 정보 추가
            "count": len(grouped_materials) if grouped_materials else len(materials)
        }
        
    except Exception as e:
        logger.error(f"Failed to get request materials: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"구매신청 자재 조회 실패: {str(e)}"
        )


@router.get("/{request_id}/download-excel")
async def download_request_excel(
    request_id: int,
    # current_user: dict = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    구매신청 자재 데이터 조회 (프론트엔드에서 엑셀 생성용)
    """
    try:
        # 구매신청 정보 조회
        query = text("""
            SELECT request_no, excel_file_path, job_no
            FROM purchase_requests
            WHERE request_id = :request_id
        """)
        result = db.execute(query, {"request_id": request_id}).fetchone()
        
        if not result:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="구매신청을 찾을 수 없습니다"
            )
        
        file_path = os.path.join(EXCEL_DIR, result.excel_file_path)
        
        if not os.path.exists(file_path):
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="데이터 파일을 찾을 수 없습니다"
            )
        
        # JSON 파일 읽기
        with open(file_path, 'r', encoding='utf-8') as f:
            data = json.load(f)
        
        return {
            "success": True,
            "request_no": result.request_no,
            "job_no": result.job_no,
            "materials": data.get("materials", []),
            "grouped_materials": data.get("grouped_materials", [])  # 그룹화 정보도 반환
        }
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Failed to download request excel: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"엑셀 다운로드 실패: {str(e)}"
        )


def save_materials_data(materials_data: List[Dict], file_path: str, request_no: str, job_no: str, grouped_materials: List[Dict] = None):
    """
    자재 데이터를 JSON으로 저장 (프론트엔드에서 동일한 엑셀 포맷으로 생성하기 위해)
    """
    data_to_save = {
        "request_no": request_no,
        "job_no": job_no,
        "created_at": datetime.now().isoformat(),
        "materials": materials_data,
        "grouped_materials": grouped_materials or []  # 그룹화된 자재 정보 저장
    }
    
    with open(file_path, 'w', encoding='utf-8') as f:
        json.dump(data_to_save, f, ensure_ascii=False, indent=2)