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, get_current_admin
from routers.page_permissions import check_page_access
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)
):
    print(f"DEBUG: 받은 issue 데이터: {issue}")
    print(f"DEBUG: project_id: {issue.project_id}")
    # 이미지 저장
    photo_path = None
    photo_path2 = None
    
    if issue.photo:
        photo_path = save_base64_image(issue.photo)
    
    if issue.photo2:
        photo_path2 = save_base64_image(issue.photo2)
    
    # Issue 생성
    db_issue = Issue(
        category=issue.category,
        description=issue.description,
        photo_path=photo_path,
        photo_path2=photo_path2,
        reporter_id=current_user.id,
        project_id=issue.project_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)
    
    # 권한별 조회 제한
    if current_user.role == UserRole.admin:
        # 관리자는 모든 이슈 조회 가능
        pass
    else:
        # 일반 사용자는 본인이 등록한 이슈만 조회 가능
        query = query.filter(Issue.reporter_id == current_user.id)
    
    if status:
        query = query.filter(Issue.status == status)
    
    # 최신순 정렬 (report_date 기준)
    issues = query.order_by(Issue.report_date.desc()).offset(skip).limit(limit).all()
    return issues

@router.get("/admin/all", response_model=List[schemas.Issue])
async def read_all_issues_admin(
    skip: int = 0,
    limit: int = 100,
    status: Optional[IssueStatus] = None,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """이슈 관리 권한이 있는 사용자: 모든 부적합 조회"""
    # 이슈 관리 페이지 권한 확인 (관리함, 폐기함 등에서 사용)
    from routers.page_permissions import check_page_access
    
    # 관리자이거나 이슈 관리 권한이 있는 사용자만 접근 가능
    if (current_user.role != 'admin' and 
        not check_page_access(current_user.id, 'issues_manage', db) and
        not check_page_access(current_user.id, 'issues_inbox', db) and
        not check_page_access(current_user.id, 'issues_management', db) and
        not check_page_access(current_user.id, 'issues_archive', db)):
        raise HTTPException(status_code=403, detail="이슈 관리 권한이 없습니다.")
    
    query = db.query(Issue)
    
    if status:
        query = query.filter(Issue.status == status)
    
    # 최신순 정렬 (report_date 기준)
    issues = query.order_by(Issue.report_date.desc()).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")
    
    # 권한별 조회 제한
    if current_user.role != UserRole.admin and issue.reporter_id != current_user.id:
        raise HTTPException(
            status_code=403, 
            detail="본인이 등록한 부적합만 조회할 수 있습니다."
        )
    
    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)
    
    # 첫 번째 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"]
    
    # 두 번째 사진이 업데이트되는 경우 처리
    if "photo2" in update_data:
        # 기존 사진 삭제
        if issue.photo_path2:
            delete_file(issue.photo_path2)
        
        # 새 사진 저장
        if update_data["photo2"]:
            photo_path2 = save_base64_image(update_data["photo2"])
            update_data["photo_path2"] = photo_path2
        else:
            update_data["photo_path2"] = None
        
        # photo2 필드는 제거 (DB에는 photo_path2만 저장)
        del update_data["photo2"]
    
    # 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
    }

@router.put("/{issue_id}/management")
async def update_issue_management(
    issue_id: int,
    management_update: schemas.ManagementUpdateRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    관리함에서 이슈의 관리 관련 필드들을 업데이트합니다.
    """
    print(f"DEBUG: Received management update for issue {issue_id}")
    print(f"DEBUG: Update data: {management_update}")
    print(f"DEBUG: Current user: {current_user.username}")
    
    # 관리함 페이지 권한 확인
    if not (current_user.role == UserRole.admin or check_page_access(current_user.id, 'issues_management', db)):
        raise HTTPException(status_code=403, detail="관리함 접근 권한이 없습니다.")
    
    # 이슈 조회
    issue = db.query(Issue).filter(Issue.id == issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="부적합을 찾을 수 없습니다.")
    
    print(f"DEBUG: Found issue: {issue.id}")
    
    # 관리함에서만 수정 가능한 필드들만 업데이트
    update_data = management_update.dict(exclude_unset=True)
    print(f"DEBUG: Update data dict: {update_data}")
    
    for field, value in update_data.items():
        print(f"DEBUG: Processing field {field} = {value}")
        if field == 'completion_photo' and value:
            # 완료 사진 업로드 처리
            try:
                completion_photo_path = save_base64_image(value, "completion")
                setattr(issue, 'completion_photo_path', completion_photo_path)
                print(f"DEBUG: Saved completion photo: {completion_photo_path}")
            except Exception as e:
                print(f"DEBUG: Photo save error: {str(e)}")
                raise HTTPException(status_code=400, detail=f"완료 사진 저장 실패: {str(e)}")
        elif field != 'completion_photo':  # completion_photo는 위에서 처리됨
            try:
                setattr(issue, field, value)
                print(f"DEBUG: Set {field} = {value}")
            except Exception as e:
                print(f"DEBUG: Field set error for {field}: {str(e)}")
                raise HTTPException(status_code=400, detail=f"필드 {field} 설정 실패: {str(e)}")
    
    try:
        db.commit()
        db.refresh(issue)
        print(f"DEBUG: Successfully updated issue {issue.id}")
    except Exception as e:
        print(f"DEBUG: Database commit error: {str(e)}")
        db.rollback()
        raise HTTPException(status_code=500, detail=f"데이터베이스 저장 실패: {str(e)}")
    
    return {
        "message": "관리 정보가 업데이트되었습니다.",
        "issue_id": issue.id,
        "updated_fields": list(update_data.keys())
    }