from sqlalchemy.orm import Session
from sqlalchemy import asc, func
from typing import List
from fastapi.encoders import jsonable_encoder

from app.model.bussiness_model import ProjectImage as piModel, ProjectImgLabel
from app.model.schemas.project_image_schemas import ProjectImage, ProjectImagePager, ProjectImageOut
from app.db.page_util import get_pager


def get_image_pager(image: ProjectImagePager, session: Session):
    query = session.query(piModel).filter(piModel.project_id == image.project_id).order_by(asc(piModel.id))
    pager = get_pager(query, image.pagerNum, image.pagerSize)
    pager.data = [ProjectImage.from_orm(image) for image in pager.data]
    return pager


def get_image_pager2(image: ProjectImage, session: Session):
    # 1 子查询
    subquery = (
        session.query(
            ProjectImgLabel.image_id,
            func.ifnull(func.count(ProjectImgLabel.id), 0).label('label_count')
        )
        .group_by(ProjectImgLabel.image_id)
        .subquery()
    )
    # 2 主查询
    query = (
        session.query(
            piModel,
            func.ifnull(subquery.c.label_count, 0).label('label_count')
        )
        .outerjoin(subquery, piModel.id == subquery.c.image_id)
    )
    query = query.filter(piModel.project_id == image.project_id)\
        .filter(piModel.img_type == image.img_type).order_by(asc(piModel.id))
    pager = get_pager(query, image.pagerNum, image.pagerSize)
    datas = []
    for result in pager.data:
        data = ProjectImageOut.from_orm(result[0])
        data.label_count = result[1]
        datas.append(data)
    pager.data = jsonable_encoder(datas)
    return pager


def check_img_name(project_id: int, img_type: str, file_name: str, session: Session):
    """
    根据项目id和文件名称进行查重
    :param project_id:
    :param img_type:
    :param file_name:
    :param session:
    :return:
    """
    image = session.query(piModel)\
        .filter(piModel.project_id == project_id)\
        .filter(piModel.file_name == file_name)\
        .filter(piModel.img_type == img_type)\
        .first()
    if image is not None:
        return False
    return True


def get_img_url(image_id: int, session: Session):
    """
    根据id获取图片
    :param image_id:
    :param session:
    :return:
    """
    result = session.query(piModel).filter_by(id=image_id).first()
    sour_url = result.image_url
    thumb_url = result.thumb_image_url
    return sour_url, thumb_url


def get_image_list(project_id: int, img_type: str, session: Session):
    query = session.query(piModel).filter(piModel.project_id == project_id)\
        .filter(piModel.img_type == img_type)\
        .order_by(asc(piModel.id))
    image_list = [ProjectImage.from_orm(image) for image in query.all()]
    return image_list


def get_images(project_id: int, img_type: str, session: Session):
    query = session.query(piModel).filter(piModel.project_id == project_id)\
        .filter(piModel.img_type == img_type).order_by(asc(piModel.id))
    return query.all()


def get_image_count(project_id: int, img_type: str, session: Session):
    query = session.query(piModel).filter(piModel.project_id == project_id)\
        .filter(piModel.img_type == img_type).order_by(asc(piModel.id))
    return query.count()


def add_image(image: ProjectImage, session: Session):
    session.add(image)
    session.commit()
    return image


def add_image_batch(images: List[ProjectImage], session: Session):
    session.add_all(images)
    session.commit()


def del_image(image_id: str, session: Session):
    row_del = session.query(piModel).filter_by(id=image_id).delete()
    session.commit()
    return row_del