from sqlalchemy.orm import Session
from sqlalchemy import desc, and_, func, case
from fastapi.encoders import jsonable_encoder

from app.model.bussiness_model import ProjectInfo, ProjectImage, ProjectImgLeafer
from app.model.schemas.project_info_schemas import ProjectInfoOut, ProjectInfoPager, ProjectInfoPagerOut
from app.db.page_util import get_pager


def get_project_pager(info: ProjectInfoPager, session: Session):
    """分页查询项目信息"""
    query = session.query(ProjectInfo).order_by(desc(ProjectInfo.id))
    filters = [ProjectInfo.del_flag == 0]
    if info.project_name is not None and info.project_name != '':
        filters.append(ProjectInfo.project_name.ilike(f"%{info.project_name}%"))
    if len(filters) > 0:
        query = query.filter(and_(*filters))
    pager = get_pager(query, info.pagerNum, info.pagerSize)
    pager.data = [ProjectInfoOut.from_orm(info).dict() for info in pager.data]
    return pager


def get_project_pager2(info: ProjectInfoPager, session: Session):
    # 1. 定义子查询
    subquery = (
        session.query(
            ProjectImage.project_id,
            func.sum(case((ProjectImgLeafer.id.is_(None), 1), else_=0)).label('no_mark_count'),
            func.sum(case((ProjectImgLeafer.id.isnot(None), 1), else_=0)).label('mark_count')
        )
        .outerjoin(ProjectImgLeafer, ProjectImage.id == ProjectImgLeafer.image_id)
        .group_by(ProjectImage.project_id)
        .subquery()
    )

    # 2. 主查询
    query = (
        session.query(
            ProjectInfo,
            func.ifnull(subquery.c.mark_count, 0).label('mark_count'),
            func.ifnull(subquery.c.no_mark_count, 0).label('no_mark_count')
        )
        .outerjoin(subquery, ProjectInfo.id == subquery.c.project_id)
    )
    query = query.order_by(desc(ProjectInfo.id))
    filters = [ProjectInfo.del_flag == 0]
    if info.project_name is not None and info.project_name != '':
        filters.append(ProjectInfo.project_name.ilike(f"%{info.project_name}%"))
    query = query.filter(and_(*filters))
    pager = get_pager(query, info.pagerNum, info.pagerSize)
    datas = []
    for result in pager.data:
        data = ProjectInfoPagerOut.from_orm(result[0])
        data.mark_count = result[1]
        data.no_mark_count = result[2]
        datas.append(data)
    pager.data = jsonable_encoder(datas)
    return pager


def get_project_by_id(project_id: str, session: Session):
    info = session.query(ProjectInfo).filter_by(id=project_id).filter_by(del_flag=0).first()
    info_out = ProjectInfoOut.from_orm(info)
    return info_out


def add_project(info: ProjectInfo, session: Session):
    """新建项目,并在对应文件夹下面创建文件夹"""
    info.del_flag = 0
    session.add(info)
    session.commit()
    return info


def check_project_name(project_name: str, session: Session):
    """检验是否存在重名的项目名称"""
    count = session.query(ProjectInfo).filter(ProjectInfo.project_name == project_name)\
        .filter(ProjectInfo.del_flag==0).count()
    if count > 0:
        return True
    else:
        return False


def update_project_status(project_id: int, project_status: str, session: Session):
    """
    更新项目训练状态,如果是已完成的话，train_version自动+1
    :param project_id:
    :param project_status: 0-未运行，1-运行中，2-已完成,-1-执行失败
    :param session:
    :return:
    """
    if project_status == '2':
        session.query(ProjectInfo).filter_by(id=project_id).update({
            'project_status': project_status,
            'train_version': ProjectInfo.train_version + 1
        })
    else:
        session.query(ProjectInfo).filter_by(id=project_id).update({
            'project_status': project_status
        })
    session.commit()


def del_project(project_id: int, session: Session):
    """
    删除项目
    :param project_id:
    :param session:
    :return:
    """
    session.query(ProjectInfo).filter_by(id=project_id).update({
        'del_flag': 1
    })
    session.commit()