#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
@Version: 1.0
@Python Version:3.6.6
@Author: ludq1
@Email: ludq1@chinaunicom.cn
@date: 2023/04/07 11:40:00
@Description:
"""

from typing import Union, List, Tuple, Optional

from .globalutility import Utility
from .my_baseexception import create_base_exception
from .my_stringutils import MyStringUtils


class MysqlUtils:
    """
    mysql语句生成工具类
    """

    @classmethod
    def gen_insertsql(cls, table_name: str, a_dict: dict) -> str:
        r"""
        生成 数据库插入语句,

        map 中的值必须是字符串或None

        当 map 中的值为 None 时，填充null值,

        当 map 为 None 或empty时返回空字符串

        Args:
            table_name:
            a_dict:
        Returns:

        """

        # 判断参数
        if a_dict is None or not a_dict:
            return MyStringUtils.EMPTY

        if not isinstance(a_dict, dict):
            raise ValueError("a_dict 不是字典")

        table_name = MyStringUtils.to_str(table_name, trim=True)
        if MyStringUtils.is_empty(table_name):
            raise ValueError("table_name 不能为空")

        table_name = Utility.do_filter_mysql_field(table_name, append_fix='`')

        columns = []
        values = []
        for tmp_k, tmp_v in a_dict.items():
            tmp_k = Utility.do_filter_mysql_field(tmp_k, append_fix='`')
            tmp_v = Utility.do_filter_mysql_param(tmp_v, append_fix="'")
            columns.append(tmp_k)
            values.append(tmp_v)

        return Utility.join_str_with_none("insert ", table_name, "(",
                                          Utility.list_join_to_str(columns, separator_str=",", ignore_none=False),
                                          ") select ",
                                          Utility.list_join_to_str(values, separator_str=",", ignore_none=False))

    @classmethod
    def gen_insertsql_with_on_duplcate_key_update(cls, table_name: str, a_dict: dict) -> str:
        r"""
        生成 数据库插入语句,当值为null时，填充null值, 使用 ON DUPLICATE KEY UPDATE

        map 中的值必须是字符串或None

        当 map 中的值为 None 时，填充null值,

        当 map 为 None 或empty时返回空字符串

        Args:
            table_name:
            a_dict:
        Returns:

        """

        # 判断参数
        if a_dict is None or not a_dict:
            return MyStringUtils.EMPTY

        if not isinstance(a_dict, dict):
            raise ValueError("a_dict 不是字典")

        table_name = MyStringUtils.to_str(table_name, trim=True)
        if MyStringUtils.is_empty(table_name):
            raise ValueError("table_name 不能为空")

        table_name = Utility.do_filter_mysql_field(table_name, append_fix='`')

        columns = []
        values = []
        on_duplicate_key_update_list = []

        for tmp_k, tmp_v in a_dict.items():
            tmp_k = Utility.do_filter_mysql_field(tmp_k, append_fix='`')
            tmp_v = Utility.do_filter_mysql_param(tmp_v, append_fix="'")
            columns.append(tmp_k)
            values.append(tmp_v)
            tmp_on_duplcate_key_update_content = Utility.join_str(
                tmp_k, "=values(", tmp_v, ")",
                separator_str='', wrapper_str=None,
                ignore_none=False
            )
            on_duplicate_key_update_list.append(tmp_on_duplcate_key_update_content)

        return Utility.join_str_with_none(
            "insert ", table_name, "(",
            Utility.list_join_to_str(columns, separator_str=",", ignore_none=False),
            ") select ",
            Utility.list_join_to_str(values, separator_str=",", ignore_none=False),
            " ON DUPLICATE KEY UPDATE ",
            Utility.list_join_to_str(
                on_duplicate_key_update_list,
                separator_str=",", ignore_none=False
            )
        )

    @classmethod
    def gen_insertsql_multi(cls, table_name: str, a_list: Union[List[dict], Tuple[dict]]) -> Optional[List[str]]:
        r"""
        批量生成 数据库插入语句,

        a_list 中必须是字典,

        a_list 为 None时返回 None

        map 中的值必须是字符串或None

        当 map 中的值为 None 时，填充null值,

        当 map 为 None 或empty时返回空字符串

        Args:
            table_name:
            a_list:
        Returns:

        """

        # 判断参数
        if a_list is None:
            return None

        if not isinstance(a_list, (list, tuple)):
            raise ValueError("a_list 不是列表")

        if not a_list:
            return []

        result_list = []
        for tmp_dict in a_list:
            tmp_sql = cls.gen_insertsql(table_name, tmp_dict)
            result_list.append(tmp_sql)

        return result_list

    @classmethod
    def gen_part_sql_for_update(cls, update_dict: dict, ignore_none: bool = True) -> str:
        r"""
        生成update语句中 set k1=v1,k2=v2 这部分语句(不包括set)

        update中的值为null时，根据 ignore_none 的值决定时忽略该key,还是设置为 set key=null

        ignore_none 默认为True

        Args:
            update_dict:
            ignore_none:
        Returns:

        """
        # 检查参数
        if update_dict is None or not update_dict:
            return MyStringUtils.EMPTY

        if not isinstance(update_dict, dict):
            raise ValueError("update_dict 不是字典")

        col_values = []
        for tmp_k, tmp_v in update_dict.items():
            tmp_k = Utility.do_filter_mysql_field(tmp_k, append_fix='`')
            tmp_v = Utility.do_filter_mysql_param(tmp_v, append_fix="'")
            if tmp_v is None:
                if ignore_none:
                    continue
                else:
                    tmp_v = 'null'

            col_values.append(Utility.join_str(tmp_k, '=', tmp_v))

        if not col_values:
            raise create_base_exception(
                Utility.join_str_with_none("参数错误:",
                                           "update_dict所有的value都是None"),
                submitted_webarg=Utility.join_str_with_none(cls.__name__,
                                                            " gen_part_sql_for_update时 ",
                                                            "update_dict所有的value都是None")
            )

        return Utility.list_join_to_str(col_values, separator_str=',')

    @classmethod
    def gen_part_sql_for_where(cls, where_dict: dict, where_dict_can_be_none_or_empty: bool = False,
                               table_alias_name: str = None) -> str:
        r"""
        生成update语句中 where k1=v1 and k2=v2 这部分语句(不包括where)

        where_dict 中的值为null时，判断语句为 key is null

        当 where_dict 为 None 或 空字典时, 根据 where_dict_can_be_none_or_empty 决定是抛出异常还是返回 1=1

        where_dict_can_be_none_or_empty 默认为False

        Args:
            where_dict:
            where_dict_can_be_none_or_empty:
            table_alias_name: 表的别名
        Returns:

        """
        # 检查参数
        if not where_dict:
            if not where_dict_can_be_none_or_empty:
                raise create_base_exception(
                    Utility.join_str_with_none("参数错误:", "where_dict为空"),
                    submitted_webarg=Utility.join_str_with_none(
                        cls.__name__, " gen_part_sql_for_where时 ", "where_dict为空"
                    )
                )
            else:
                return '1=1'

        if not isinstance(where_dict, dict):
            raise ValueError("where_dict 不是字典")

        where_args = []
        table_alias_name = Utility.do_filter_mysql_field(
            table_alias_name, append_fix='`') if table_alias_name else table_alias_name
        for tmp_k, tmp_v in where_dict.items():
            tmp_k = Utility.do_filter_mysql_field(tmp_k, append_fix='`')
            if table_alias_name:
                tmp_k = Utility.join_str(table_alias_name, ".", tmp_k)
            tmp_v = Utility.do_filter_mysql_param(tmp_v, append_fix="'")
            if tmp_v is None:
                where_args.append(Utility.join_str(tmp_k, ' is null'))
            else:
                where_args.append(Utility.join_str(tmp_k, '=', tmp_v))

        return Utility.list_join_to_str(where_args, separator_str=' and ')

    @classmethod
    def gen_updatesql(cls, table_name: str, update_dict: dict, where_dict: dict, ignore_none: bool = True,
                      where_dict_can_be_none_or_empty: bool = False) -> str:
        r"""
        生成update语句,

        update_dict 中的值为null时，根据 ignore_none 的值决定时忽略该key,还是设置为 set key=null

        ignore_none 默认为True

        如果 update_dict 为 None 或 空字典时,返回 EMPTY

        where_dict 中的值为null时，判断语句为 key is null

        当 where_dict 为 None 或 空字典时, 根据 where_dict_can_be_none_or_empty 决定是抛出异常还是使用 1=1

        where_dict_can_be_none_or_empty 默认为False

        Args:
            table_name:
            update_dict:
            where_dict:
            ignore_none:
            where_dict_can_be_none_or_empty:
        Returns:

        """
        # 检查参数
        if update_dict is None or not update_dict:
            return MyStringUtils.EMPTY

        if (where_dict is None or not where_dict) and not where_dict_can_be_none_or_empty:
            raise create_base_exception(
                Utility.join_str_with_none("参数错误:",
                                           "where_dict为空"),
                submitted_webarg=Utility.join_str_with_none(cls.__name__,
                                                            " gen_updatesql时 ",
                                                            "where_dict为空")
            )

        table_name = MyStringUtils.to_str(table_name, trim=True)
        if MyStringUtils.is_empty(table_name):
            raise ValueError("table_name 不能为空")

        table_name = Utility.do_filter_mysql_field(table_name, append_fix='`')

        return Utility.join_str("update ", table_name, " set ",
                                cls.gen_part_sql_for_update(update_dict, ignore_none), " where ",
                                cls.gen_part_sql_for_where(where_dict,
                                                           where_dict_can_be_none_or_empty))

    @classmethod
    def gen_delsql(cls, table_name: str, where_dict: dict, where_dict_can_be_none_or_empty: bool = False) -> str:
        r"""
        生成delete语句,

        where_dict 中的值为null时，判断语句为 key is null

        当 where_dict 为 None 或 空字典时, 根据 where_dict_can_be_none_or_empty 决定是抛出异常还是使用 1=1

        where_dict_can_be_none_or_empty 默认为False

        Args:
            table_name:
            where_dict:
            where_dict_can_be_none_or_empty:
        Returns:

        """
        # 检查参数
        if (where_dict is None or not where_dict) and not where_dict_can_be_none_or_empty:
            raise create_base_exception(
                Utility.join_str_with_none("参数错误:",
                                           "where_dict为空"),
                submitted_webarg=Utility.join_str_with_none(cls.__name__,
                                                            " gen_delsql时 ",
                                                            "where_dict为空")
            )

        table_name = MyStringUtils.to_str(table_name, trim=True)
        if MyStringUtils.is_empty(table_name):
            raise ValueError("table_name 不能为空")

        table_name = Utility.do_filter_mysql_field(table_name, append_fix='`')

        return Utility.join_str("delete from ", table_name, " where ",
                                cls.gen_part_sql_for_where(where_dict,
                                                           where_dict_can_be_none_or_empty))