from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from typing import List, Optional
from datetime import datetime

from database.database import get_db
from database.models import Issue, IssueStatus, User, UserRole
from database import schemas
from routers.auth import get_current_user
from services.file_service import save_base64_image, delete_file

router = APIRouter(prefix="/api/issues", tags=["issues"])

@router.post("/", response_model=schemas.Issue)
async def create_issue(
    issue: schemas.IssueCreate,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    # 이미지 저장
    photo_path = None
    if issue.photo:
        photo_path = save_base64_image(issue.photo)
    
    # Issue 생성
    db_issue = Issue(
        category=issue.category,
        description=issue.description,
        photo_path=photo_path,
        reporter_id=current_user.id,
        status=IssueStatus.NEW
    )
    db.add(db_issue)
    db.commit()
    db.refresh(db_issue)
    return db_issue

@router.get("/", response_model=List[schemas.Issue])
async def read_issues(
    skip: int = 0,
    limit: int = 100,
    status: Optional[IssueStatus] = None,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    query = db.query(Issue)
    
    # 일반 사용자는 자신의 이슈만 조회
    if current_user.role == UserRole.USER:
        query = query.filter(Issue.reporter_id == current_user.id)
    
    if status:
        query = query.filter(Issue.status == status)
    
    issues = query.offset(skip).limit(limit).all()
    return issues

@router.get("/{issue_id}", response_model=schemas.Issue)
async def read_issue(
    issue_id: int,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    issue = db.query(Issue).filter(Issue.id == issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="Issue not found")
    
    # 권한 확인
    if current_user.role == UserRole.USER and issue.reporter_id != current_user.id:
        raise HTTPException(status_code=403, detail="Not authorized to view this issue")
    
    return issue

@router.put("/{issue_id}", response_model=schemas.Issue)
async def update_issue(
    issue_id: int,
    issue_update: schemas.IssueUpdate,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    issue = db.query(Issue).filter(Issue.id == issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="Issue not found")
    
    # 권한 확인
    if current_user.role == UserRole.USER and issue.reporter_id != current_user.id:
        raise HTTPException(status_code=403, detail="Not authorized to update this issue")
    
    # 업데이트
    update_data = issue_update.dict(exclude_unset=True)
    
    # 사진이 업데이트되는 경우 처리
    if "photo" in update_data:
        # 기존 사진 삭제
        if issue.photo_path:
            delete_file(issue.photo_path)
        
        # 새 사진 저장
        if update_data["photo"]:
            photo_path = save_base64_image(update_data["photo"])
            update_data["photo_path"] = photo_path
        else:
            update_data["photo_path"] = None
        
        # photo 필드는 제거 (DB에는 photo_path만 저장)
        del update_data["photo"]
    
    # work_hours가 입력되면 자동으로 상태를 complete로 변경
    if "work_hours" in update_data and update_data["work_hours"] > 0:
        if issue.status == IssueStatus.NEW:
            update_data["status"] = IssueStatus.COMPLETE
    
    for field, value in update_data.items():
        setattr(issue, field, value)
    
    db.commit()
    db.refresh(issue)
    return issue

@router.delete("/{issue_id}")
async def delete_issue(
    issue_id: int,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    issue = db.query(Issue).filter(Issue.id == issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="Issue not found")
    
    # 권한 확인 (관리자만 삭제 가능)
    if current_user.role != UserRole.ADMIN:
        raise HTTPException(status_code=403, detail="Only admin can delete issues")
    
    # 이미지 파일 삭제
    if issue.photo_path:
        delete_file(issue.photo_path)
    
    db.delete(issue)
    db.commit()
    return {"detail": "Issue deleted successfully"}

@router.get("/stats/summary")
async def get_issue_stats(
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """이슈 통계 조회"""
    query = db.query(Issue)
    
    # 일반 사용자는 자신의 이슈만
    if current_user.role == UserRole.USER:
        query = query.filter(Issue.reporter_id == current_user.id)
    
    total = query.count()
    new = query.filter(Issue.status == IssueStatus.NEW).count()
    progress = query.filter(Issue.status == IssueStatus.PROGRESS).count()
    complete = query.filter(Issue.status == IssueStatus.COMPLETE).count()
    
    return {
        "total": total,
        "new": new,
        "progress": progress,
        "complete": complete
    }