from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from sqlalchemy import text
from typing import Optional
from datetime import datetime, date
from pydantic import BaseModel

from ..database import get_db

router = APIRouter()

# Pydantic 모델들
class JobCreate(BaseModel):
    job_no: str
    job_name: str
    client_name: str
    end_user: Optional[str] = None
    epc_company: Optional[str] = None
    project_site: Optional[str] = None
    contract_date: Optional[date] = None
    delivery_date: Optional[date] = None
    delivery_terms: Optional[str] = None
    project_type: Optional[str] = "냉동기"
    description: Optional[str] = None

@router.get("/")
async def get_jobs(
    skip: int = Query(0, ge=0),
    limit: int = Query(100, ge=1, le=1000),
    search: Optional[str] = Query(None),
    db: Session = Depends(get_db)
):
    """Job 목록 조회 (job_name을 프로젝트명으로 사용)"""
    try:
        query = """
            SELECT job_no, job_name, client_name, end_user, epc_company,
                   project_site, contract_date, delivery_date, delivery_terms,
                   project_type, status, description, created_by, created_at, updated_at, is_active
            FROM jobs
            WHERE is_active = true
        """
        
        params = {}
        
        if search:
            query += " AND (job_no ILIKE :search OR job_name ILIKE :search OR client_name ILIKE :search)"
            params["search"] = f"%{search}%"
        
        query += " ORDER BY created_at DESC LIMIT :limit OFFSET :skip"
        params["limit"] = limit
        params["skip"] = skip
        
        result = db.execute(text(query), params)
        jobs = result.fetchall()
        
        return {
            "success": True,
            "total_count": len(jobs),
            "jobs": [
                {
                    "job_no": job.job_no,
                    "job_name": job.job_name,
                    "client_name": job.client_name,
                    "end_user": job.end_user,
                    "epc_company": job.epc_company,
                    "project_site": job.project_site,
                    "contract_date": job.contract_date,
                    "delivery_date": job.delivery_date,
                    "delivery_terms": job.delivery_terms,
                    "project_type": job.project_type,
                    "status": job.status,
                    "description": job.description,
                    "created_at": job.created_at,
                    "project_name": job.job_name  # job_name을 프로젝트명으로 사용
                }
                for job in jobs
            ]
        }
        
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Job 목록 조회 실패: {str(e)}")

@router.get("/{job_no}")
async def get_job(job_no: str, db: Session = Depends(get_db)):
    """Job 상세 정보 조회"""
    try:
        query = text("""
            SELECT job_no, job_name, client_name, end_user, epc_company,
                   project_site, contract_date, delivery_date, delivery_terms,
                   project_type, status, description, created_by, created_at, updated_at, is_active
            FROM jobs
            WHERE job_no = :job_no AND is_active = true
        """)
        
        result = db.execute(query, {"job_no": job_no})
        job = result.fetchone()
        
        if not job:
            raise HTTPException(status_code=404, detail="Job을 찾을 수 없습니다")
        
        return {
            "success": True,
            "job": {
                "job_no": job.job_no,
                "job_name": job.job_name,
                "client_name": job.client_name,
                "end_user": job.end_user,
                "epc_company": job.epc_company,
                "project_site": job.project_site,
                "contract_date": job.contract_date,
                "delivery_date": job.delivery_date,
                "delivery_terms": job.delivery_terms,
                "project_type": job.project_type,
                "status": job.status,
                "description": job.description,
                "created_by": job.created_by,
                "created_at": job.created_at
            }
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Job 조회 실패: {str(e)}")

@router.post("/")
async def create_job(job: JobCreate, db: Session = Depends(get_db)):
    """새 Job 생성"""
    try:
        # Job No. 중복 확인
        check_query = text("SELECT job_no FROM jobs WHERE job_no = :job_no")
        existing = db.execute(check_query, {"job_no": job.job_no}).fetchone()
        
        if existing:
            raise HTTPException(
                status_code=400, 
                detail=f"Job No. '{job.job_no}'가 이미 존재합니다"
            )
        
        # 새 Job 생성
        insert_query = text("""
            INSERT INTO jobs (
                job_no, job_name, client_name, end_user, epc_company,
                project_site, contract_date, delivery_date, delivery_terms,
                project_type, description, created_by, status, is_active
            )
            VALUES (
                :job_no, :job_name, :client_name, :end_user, :epc_company,
                :project_site, :contract_date, :delivery_date, :delivery_terms,
                :project_type, :description, :created_by, :status, :is_active
            )
            RETURNING job_no, job_name, client_name, project_type
        """)
        
        result = db.execute(insert_query, {
            **job.dict(),
            "created_by": "admin",
            "status": "진행중",
            "is_active": True
        })
        
        new_job = result.fetchone()
        db.commit()
        
        return {
            "success": True,
            "message": "Job이 성공적으로 생성되었습니다",
            "job": {
                "job_no": new_job.job_no,
                "job_name": new_job.job_name,
                "client_name": new_job.client_name,
                "project_type": new_job.project_type
            }
        }
        
    except HTTPException:
        db.rollback()
        raise
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f"Job 생성 실패: {str(e)}")