import mysql.connector
import pandas as pd
from openpyxl import Workbook
from openpyxl.utils.dataframe import dataframe_to_rows
from openpyxl.utils import get_column_letter


class DailySalesExporter:
    def __init__(self, db_config):
        self.db_config = db_config
        self.query = """
SELECT *, IF(temp.`总单数` = 0, 0, temp.`2000+单数` / temp.`总单数`) AS `2000+单数占比`, WEEK(temp.`单据日期`, 1) AS `第几周` 
FROM (
    SELECT
        t1.document_date AS 单据日期,
        SUM(CASE WHEN t1.remaining_amount_after_return <= 999 THEN 1 ELSE 0 END) AS `999及以内单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return > 999 AND t1.remaining_amount_after_return < 2000 THEN 1 ELSE 0 END) AS `1000-1999单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return >= 2000 AND t1.remaining_amount_after_return <= 2899 THEN 1 ELSE 0 END) AS `2000-2899单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return > 2899 AND t1.remaining_amount_after_return <= 3999 THEN 1 ELSE 0 END) AS `2900-3999单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return > 3999 AND t1.remaining_amount_after_return <= 4999 THEN 1 ELSE 0 END) AS `4000-4999单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return > 4999 AND t1.remaining_amount_after_return <= 7999 THEN 1 ELSE 0 END) AS `5000-7999单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return > 7999 THEN 1 ELSE 0 END) AS `8000以上单数`,
        SUM(CASE WHEN t2.refund_meets_big_order != '不符合' THEN 1 ELSE 0 END) AS `满足奖励条件大单数`,
        MAX(t2.big_order_items) AS `最大单件数`,
        MAX(t2.big_order_amount) AS `最大单金额`,
        COUNT(1) AS `总单数`,
        SUM(CASE WHEN t1.remaining_amount_after_return >= 2000 THEN 1 ELSE 0 END) AS `2000+单数`
    FROM sd_sales_order AS t1
    LEFT JOIN sd_big_sales_order AS t2 ON t1.sale_id = t2.sale_id
    GROUP BY t1.document_date
) AS temp;
"""

    def export(self, output_file='output_with_weekly_summary.xlsx'):
        global cursor, connection
        try:
            connection = mysql.connector.connect(**self.db_config)
            cursor = connection.cursor()
            cursor.execute(self.query)
            rows = cursor.fetchall()
            columns = [desc[0] for desc in cursor.description]
        finally:
            cursor.close()
            connection.close()

        df = pd.DataFrame(rows, columns=columns)
        df['单据日期'] = pd.to_datetime(df['单据日期'])
        df = df.sort_values('单据日期').reset_index(drop=True)

        weekly_summary = df.groupby('第几周').agg({
            col: 'sum' for col in df.columns if col not in ['单据日期', '2000+单数占比', '第几周']
        }).reset_index()

        weekly_summary['2000+单数'] = pd.to_numeric(weekly_summary['2000+单数'], errors='coerce')
        weekly_summary['总单数'] = pd.to_numeric(weekly_summary['总单数'], errors='coerce')
        weekly_summary['2000+单数占比'] = (weekly_summary['2000+单数'] / weekly_summary['总单数']).fillna(0).round(4)

        new_data = []
        current_week = None

        for _, row in df.iterrows():

            week_group = row['第几周']

            if current_week != week_group and current_week is not None:
                summary_row = weekly_summary[weekly_summary['第几周'] == current_week].iloc[0].to_dict()
                start_date = df[df['第几周'] == current_week]['单据日期'].min().strftime('%m-%d')
                end_date = df[df['第几周'] == current_week]['单据日期'].max().strftime('%m-%d')
                summary_row['单据日期'] = f"{start_date}-{end_date} 汇总"
                new_data.append(summary_row)

            new_data.append(row.to_dict())
            current_week = week_group

        if current_week is not None:
            summary_row = weekly_summary[weekly_summary['第几周'] == current_week].iloc[0].to_dict()
            start_date = df[df['第几周'] == current_week]['单据日期'].min().strftime('%m-%d')
            end_date = df[df['第几周'] == current_week]['单据日期'].max().strftime('%m-%d')
            summary_row['单据日期'] = f"{start_date}-{end_date} 汇总"
            new_data.append(summary_row)

        new_df = pd.DataFrame(new_data).drop(columns=['第几周'])

        wb = Workbook()
        ws = wb.active
        for r in dataframe_to_rows(new_df, index=False, header=True):
            ws.append(r)

        header = {cell.value: cell.column for cell in ws[1]}
        numeric_columns = [
            '999及以内单数', '1000-1999单数', '2000-2899单数', '2900-3999单数',
            '4000-4999单数', '5000-7999单数', '8000以上单数', '满足奖励条件大单数',
            '最大单件数', '最大单金额', '总单数', '2000+单数'
        ]

        for col_name in numeric_columns:
            if col_name in header:
                col_letter = get_column_letter(header[col_name])
                for cell in ws[col_letter]:
                    if cell.row == 1:
                        continue
                    cell.number_format = '0'

        if '2000+单数占比' in header:
            col_letter = get_column_letter(header['2000+单数占比'])
            for cell in ws[col_letter]:
                if cell.row == 1:
                    continue
                cell.number_format = '0.00%'

        wb.save(output_file)
        print(f"✅ 数据已成功导出到 {output_file}")

    def export_to_dataframe(self):
        connection = mysql.connector.connect(**self.db_config)
        cursor = connection.cursor()
        try:
            cursor.execute(self.query)
            rows = cursor.fetchall()
            columns = [desc[0] for desc in cursor.description]
        finally:
            cursor.close()
            connection.close()

        df = pd.DataFrame(rows, columns=columns)
        df['单据日期'] = pd.to_datetime(df['单据日期'])
        df = df.sort_values('单据日期').reset_index(drop=True)

        weekly_summary = df.groupby('第几周').agg({
            col: 'sum' for col in df.columns if col not in ['单据日期', '2000+单数占比', '第几周']
        }).reset_index()

        weekly_summary['2000+单数'] = pd.to_numeric(weekly_summary['2000+单数'], errors='coerce')
        weekly_summary['总单数'] = pd.to_numeric(weekly_summary['总单数'], errors='coerce')
        weekly_summary['2000+单数占比'] = (weekly_summary['2000+单数'] / weekly_summary['总单数']).fillna(0).round(4)

        new_data = []
        current_week = None

        for _, row in df.iterrows():
            week_group = row['第几周']

            if current_week != week_group and current_week is not None:
                summary_row = weekly_summary[weekly_summary['第几周'] == current_week].iloc[0].to_dict()
                start_date = df[df['第几周'] == current_week]['单据日期'].min().strftime('%m-%d')
                end_date = df[df['第几周'] == current_week]['单据日期'].max().strftime('%m-%d')
                summary_row['单据日期'] = f"{start_date}-{end_date} 汇总"
                new_data.append(summary_row)

            new_data.append(row.to_dict())
            current_week = week_group

        if current_week is not None:
            summary_row = weekly_summary[weekly_summary['第几周'] == current_week].iloc[0].to_dict()
            start_date = df[df['第几周'] == current_week]['单据日期'].min().strftime('%m-%d')
            end_date = df[df['第几周'] == current_week]['单据日期'].max().strftime('%m-%d')
            summary_row['单据日期'] = f"{start_date}-{end_date} 汇总"
            new_data.append(summary_row)

        new_df = pd.DataFrame(new_data).drop(columns=['第几周'])
        return new_df