"""
Product业务逻辑服务层
"""
from typing import Optional, Tuple, List
from flask import current_app
from sqlalchemy import func, or_
from app import db
from app.models import Product, Version
from app.utils.logger import log_operation


class ProductService:
    """产品业务逻辑服务"""

    @staticmethod
    def get_products(
        page: int = 1,
        per_page: int = 20,
        keyword: str = '',
        product_type: Optional[str] = None,
        is_paid: Optional[int] = None
    ) -> Tuple[List[Product], int]:
        """
        获取产品列表
        :param page: 页码
        :param per_page: 每页数量
        :param keyword: 关键词
        :param product_type: 产品类型
        :param is_paid: 是否付费
        :return: (产品列表, 总数)
        """
        query = Product.query.filter_by(status=1)  # 只显示启用的产品

        # 关键词搜索
        if keyword:
            escaped_keyword = keyword.replace('%', '\\%').replace('_', '\\_')
            pattern = f'%{escaped_keyword}%'
            query = query.filter(
                or_(
                    Product.product_name.like(pattern, escape='\\'),
                    Product.description.like(pattern, escape='\\')
                )
            )

        # 筛选条件
        if product_type:
            query = query.filter(Product.product_type == product_type)

        query = query.order_by(Product.create_time.desc())

        # 分页
        pagination = query.paginate(page=page, per_page=per_page, error_out=False)
        return pagination.items, pagination.total

    @staticmethod
    def get_product(product_id: str) -> Optional[Product]:
        """
        获取产品详情
        :param product_id: 产品ID
        :return: 产品对象
        """
        return Product.query.filter_by(product_id=product_id, status=1).first()

    @staticmethod
    def get_latest_version(product_id: str) -> Optional[Version]:
        """
        获取产品最新版本
        :param product_id: 产品ID
        :return: 版本对象
        """
        return Version.query.filter_by(
            product_id=product_id,
            publish_status=1
        ).order_by(Version.update_time.desc(), Version.create_time.desc()).first()