from datetime import datetime, time
from sqlalchemy import delete, func, select, text, update
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.orm import selectinload
from typing import List
from module_generator.entity.do.gen_do import GenTable, GenTableColumn
from module_generator.entity.vo.gen_vo import (
    GenTableBaseModel,
    GenTableColumnBaseModel,
    GenTableColumnModel,
    GenTableModel,
    GenTablePageQueryModel,
)
from utils.page_util import PageUtil


class GenTableDao:
    """
    代码生成业务表模块数据库操作层
    """

    @classmethod
    async def get_gen_table_by_id(cls, db: AsyncSession, table_id: int):
        """
        根据业务表id获取需要生成的业务表信息

        :param db: orm对象
        :param table_id: 业务表id
        :return: 需要生成的业务表信息对象
        """
        gen_table_info = (
            (
                await db.execute(
                    select(GenTable).options(selectinload(GenTable.columns)).where(GenTable.table_id == table_id)
                )
            )
            .scalars()
            .first()
        )

        return gen_table_info

    @classmethod
    async def get_gen_table_by_name(cls, db: AsyncSession, table_name: str):
        """
        根据业务表名称获取需要生成的业务表信息

        :param db: orm对象
        :param table_name: 业务表名称
        :return: 需要生成的业务表信息对象
        """
        gen_table_info = (
            (
                await db.execute(
                    select(GenTable).options(selectinload(GenTable.columns)).where(GenTable.table_name == table_name)
                )
            )
            .scalars()
            .first()
        )

        return gen_table_info

    @classmethod
    async def get_gen_table_all(cls, db: AsyncSession):
        """
        获取所有业务表信息

        :param db: orm对象
        :return: 所有业务表信息
        """
        gen_table_all = (await db.execute(select(GenTable).options(selectinload(GenTable.columns)))).scalars().all()

        return gen_table_all

    @classmethod
    async def create_table_by_sql_dao(cls, db: AsyncSession, sql: str):
        """
        根据sql语句创建表结构

        :param db: orm对象
        :param sql: sql语句
        :return:
        """
        await db.execute(text(sql))

    @classmethod
    async def get_gen_table_list(cls, db: AsyncSession, query_object: GenTablePageQueryModel, is_page: bool = False):
        """
        根据查询参数获取代码生成业务表列表信息

        :param db: orm对象
        :param query_object: 查询参数对象
        :param is_page: 是否开启分页
        :return: 代码生成业务表列表信息对象
        """
        query = (
            select(GenTable)
            .options(selectinload(GenTable.columns))
            .where(
                func.lower(GenTable.table_name).like(f'%{query_object.table_name.lower()}%')
                if query_object.table_name
                else True,
                func.lower(GenTable.table_comment).like(f'%{query_object.table_comment.lower()}%')
                if query_object.table_comment
                else True,
                GenTable.create_time.between(
                    datetime.combine(datetime.strptime(query_object.begin_time, '%Y-%m-%d'), time(00, 00, 00)),
                    datetime.combine(datetime.strptime(query_object.end_time, '%Y-%m-%d'), time(23, 59, 59)),
                )
                if query_object.begin_time and query_object.end_time
                else True,
            )
            .distinct()
        )
        gen_table_list = await PageUtil.paginate(db, query, query_object.page_num, query_object.page_size, is_page)

        return gen_table_list

    @classmethod
    async def get_gen_db_table_list(cls, db: AsyncSession, query_object: GenTablePageQueryModel, is_page: bool = False):
        """
        根据查询参数获取数据库列表信息

        :param db: orm对象
        :param query_object: 查询参数对象
        :param is_page: 是否开启分页
        :return: 数据库列表信息对象
        """
        query_sql = """
            table_name as table_name, 
            table_comment as table_comment, 
            create_time as create_time, 
            update_time as update_time
        from 
            information_schema.tables
		where 
            table_schema = (select database())
            and table_name not like 'apscheduler\_%' 
            and table_name not like 'gen\_%'
            and table_name not in (select table_name from gen_table)
        """
        if query_object.table_name:
            query_sql += """and lower(table_name) like lower(concat('%', :table_name, '%'))"""
        if query_object.table_comment:
            query_sql += """and lower(table_comment) like lower(concat('%', :table_comment, '%'))"""
        if query_object.begin_time:
            query_sql += """and date_format(create_time, '%Y%m%d') >= date_format(:begin_time, '%Y%m%d')"""
        if query_object.end_time:
            query_sql += """and date_format(create_time, '%Y%m%d') >= date_format(:end_time, '%Y%m%d')"""
        query_sql += """order by create_time desc"""
        query = select(
            text(query_sql).bindparams(
                **{
                    k: v
                    for k, v in query_object.model_dump(exclude_none=True, exclude={'page_num', 'page_size'}).items()
                }
            )
        )
        gen_db_table_list = await PageUtil.paginate(db, query, query_object.page_num, query_object.page_size, is_page)

        return gen_db_table_list

    @classmethod
    async def get_gen_db_table_list_by_names(cls, db: AsyncSession, table_names: List[str]):
        """
        根据业务表名称组获取数据库列表信息

        :param db: orm对象
        :param table_names: 业务表名称组
        :return: 数据库列表信息对象
        """
        query_sql = """
        select
            table_name as table_name, 
            table_comment as table_comment, 
            create_time as create_time, 
            update_time as update_time 
        from 
            information_schema.tables
		where 
            table_name not like 'qrtz\_%' 
            and table_name not like 'gen\_%' 
            and table_schema = (select database())
            and table_name in :table_names
        """
        query = text(query_sql).bindparams(table_names=tuple(table_names))
        gen_db_table_list = (await db.execute(query)).fetchall()

        return gen_db_table_list

    @classmethod
    async def add_gen_table_dao(cls, db: AsyncSession, gen_table: GenTableModel):
        """
        新增业务表数据库操作

        :param db: orm对象
        :param gen_table: 业务表对象
        :return:
        """
        db_gen_table = GenTable(**GenTableBaseModel(**gen_table.model_dump(by_alias=True)).model_dump())
        db.add(db_gen_table)
        await db.flush()

        return db_gen_table

    @classmethod
    async def edit_gen_table_dao(cls, db: AsyncSession, gen_table: dict):
        """
        编辑业务表数据库操作

        :param db: orm对象
        :param gen_table: 需要更新的业务表字典
        :return:
        """
        await db.execute(update(GenTable), [GenTableBaseModel(**gen_table).model_dump()])

    @classmethod
    async def delete_gen_table_dao(cls, db: AsyncSession, gen_table: GenTableModel):
        """
        删除业务表数据库操作

        :param db: orm对象
        :param gen_table: 业务表对象
        :return:
        """
        await db.execute(delete(GenTable).where(GenTable.table_id.in_([gen_table.table_id])))


class GenTableColumnDao:
    """
    代码生成业务表字段模块数据库操作层
    """

    @classmethod
    async def get_gen_table_column_list_by_table_id(cls, db: AsyncSession, table_id: int):
        """
        根据业务表id获取需要生成的业务表字段列表信息

        :param db: orm对象
        :param table_id: 业务表id
        :return: 需要生成的业务表字段列表信息对象
        """
        gen_table_column_list = (
            (await db.execute(select(GenTableColumn).where(GenTableColumn.table_id == table_id))).scalars().all()
        )

        return gen_table_column_list

    @classmethod
    async def get_gen_db_table_columns_by_name(cls, db: AsyncSession, table_name: str):
        """
        根据业务表名称获取业务表字段列表信息

        :param db: orm对象
        :param table_name: 业务表名称
        :return: 业务表字段列表信息对象
        """
        query_sql = """
        select 
            column_name as column_name,
            case 
                when is_nullable = 'no' and column_key != 'PRI' then '1' 
                else '0' 
            end as is_required,
            case 
                when column_key = 'PRI' then '1' 
                else '0' 
            end as is_pk,
            ordinal_position as sort,
            column_comment as column_comment,
            case 
                when extra = 'auto_increment' then '1' 
                else '0' 
            end as is_increment,
            column_type as column_type
        from 
            information_schema.columns
        where 
            table_schema = (select database()) 
            and table_name = :table_name
        order by 
            ordinal_position
        """
        query = text(query_sql).bindparams(table_name=table_name)
        gen_db_table_columns = (await db.execute(query)).fetchall()

        return gen_db_table_columns

    @classmethod
    async def add_gen_table_column_dao(cls, db: AsyncSession, gen_table_column: GenTableColumnModel):
        """
        新增业务表字段数据库操作

        :param db: orm对象
        :param gen_table_column: 岗位对象
        :return:
        """
        db_gen_table_column = GenTableColumn(
            **GenTableColumnBaseModel(**gen_table_column.model_dump(by_alias=True)).model_dump()
        )
        db.add(db_gen_table_column)
        await db.flush()

        return db_gen_table_column

    @classmethod
    async def edit_gen_table_column_dao(cls, db: AsyncSession, gen_table_column: dict):
        """
        编辑业务表字段数据库操作

        :param db: orm对象
        :param gen_table_column: 需要更新的业务表字段字典
        :return:
        """
        await db.execute(update(GenTableColumn), [GenTableColumnBaseModel(**gen_table_column).model_dump()])

    @classmethod
    async def delete_gen_table_column_by_table_id_dao(cls, db: AsyncSession, gen_table_column: GenTableColumnModel):
        """
        通过业务表id删除业务表字段数据库操作

        :param db: orm对象
        :param gen_table_column: 业务表字段对象
        :return:
        """
        await db.execute(delete(GenTableColumn).where(GenTableColumn.table_id.in_([gen_table_column.table_id])))

    @classmethod
    async def delete_gen_table_column_by_column_id_dao(cls, db: AsyncSession, gen_table_column: GenTableColumnModel):
        """
        通过业务字段id删除业务表字段数据库操作

        :param db: orm对象
        :param post: 业务表字段对象
        :return:
        """
        await db.execute(delete(GenTableColumn).where(GenTableColumn.column_id.in_([gen_table_column.column_id])))