#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2023/4/2 9:08
# @Author  : old tom
# @File    : fu_excel.py
# @Project : futool
# @Desc    : 读写excel,需要引入openPyxl

from futool.core import fu_file
from openpyxl import load_workbook, Workbook


class ExcelNotFoundError(Exception):
    """
    excel文件不存在
    """

    def __init__(self, msg=''):
        Exception.__init__(self, msg)


class SheetNotExistError(Exception):
    """
    sheet不存在
    """

    def __init__(self, msg=''):
        Exception.__init__(self, msg)


class ExcelReader(object):
    """
    excel读取
    TODO 存在性能问题需要重构;增加流式读取功能;sheet分片方式存在问题
    """

    class SheetNotLoadError(Exception):
        def __init__(self):
            Exception.__init__(self, 'sheet not load,you need call load_sheet()')

    class OutOfColIndexError(Exception):
        def __init__(self, msg):
            Exception.__init__(self, msg)

    def __init__(self, file_path):
        if not fu_file.exist(file_path):
            raise ExcelNotFoundError(msg=f'path={file_path}')
        self.wb = load_workbook(file_path, read_only=True)
        self.sheetnames = self.wb.sheetnames
        self.sheet = None
        self.col_nums = 0

    def load_sheet(self, sheet_name: str):
        """
        指定名称读取sheet
        """
        if sheet_name not in self.sheetnames:
            raise SheetNotExistError(msg=f'{sheet_name} not exists')
        self.sheet = self.wb[sheet_name]
        return self.sheet

    def load_sheet_by_index(self, sheet_index: int):
        """
        指定下标读取sheet,从0开始
        """
        return self.load_sheet(self.sheetnames[sheet_index])

    def load_sheet_first(self):
        """
        加载第一个sheet
        :return:
        """
        return self.load_sheet_by_index(0)

    def read_row(self, row_index):
        """
        读取某一行
        """
        self._check_sheet()
        element = []
        for i, row in enumerate(self.sheet):
            if i == row_index:
                for cell in row:
                    element.append(cell.value)
        return element

    def read_range_rows(self, start, end):
        """
        范围读取
        """
        self._check_sheet()
        elements = []
        for i, row in enumerate(self.sheet):
            if start <= i <= end:
                element = []
                for cell in row:
                    element.append(cell.value)
                elements.append(tuple(element))
        return elements

    def read_rows(self, row_index: [] = None):
        """
        指定读取多行
        :param row_index: 行号,例如:[1,3,5]
        :return:
        """
        self._check_sheet()
        elements = []
        for i, row in enumerate(self.sheet):
            if i in row_index:
                element = []
                for cell in row:
                    element.append(cell.value)
                elements.append(tuple(element))
        return elements

    def read_first(self):
        """
        读取标题行
        """
        return self.read_row(0)

    def read_all(self, skip_head=True):
        """
        读取全部
        :return:
        """
        self._check_sheet()
        elements = []
        for i, row in enumerate(self.sheet):
            if skip_head:
                if i > 0:
                    element = []
                    for cell in row:
                        element.append(cell.value)
                    elements.append(tuple(element))
        return elements

    def read_column(self, col_index, skip_head=True):
        """
        按列读取
        :param col_index: 列下标，从0开始
        :param skip_head: 跳过第一行
        :return: list
        """
        self._check_sheet()
        element = []
        for i, row in enumerate(self.sheet):
            if skip_head:
                if i > 0:
                    for j, cell in enumerate(row):
                        if j == col_index:
                            element.append(cell.value)
        return element

    def read_range_column(self, start, end, skip_head=True):
        """
        范围读取列,下标从0开始
        :param start: 开始下标
        :param end: 结束下标
        :param skip_head: 跳过第一行
        :return:
        """
        self._col_nums()
        if end >= self.col_nums:
            raise self.OutOfColIndexError(msg=f'out of column index,max col was {self.col_nums} ')
        elements = []
        for i in range(start, end + 1):
            elements.append(tuple(self.read_column(i, skip_head)))
        return elements

    def _check_sheet(self):
        if self.sheet is None:
            raise self.SheetNotLoadError()

    def _col_nums(self):
        self.col_nums = len(self.read_first())


class SimpleExcelWriter(object):
    """
    excel写入
    """

    class ExcelFileExistsError(Exception):
        """
        excel文件已存在
        """

        def __init__(self, msg=''):
            Exception.__init__(self, msg)

    def __init__(self, write_path):
        if fu_file.exist(write_path):
            raise self.ExcelFileExistsError(f'{write_path} all ready exists')
        self.write_path = write_path
        self.wb = Workbook(write_only=True)

    def write(self, head: [], data: [], sheet_name='Sheet1', index=0):
        """
        写excel文件
        :param index: sheet 下标
        :param head: 第一行标题
        :param data: 数据
        :param sheet_name: sheet名称
        :return:
        """
        ws = self.wb.create_sheet(title=sheet_name, index=index)
        # 写入列头
        ws.append(head)
        for d in data:
            ws.append(d)
        self.wb.save(self.write_path)