i need an algorithm for this code 
import dash
from dash import dcc, html, dash_table
from dash.dependencies import Input, Output, State
import sqlite3
import pandas as pd
import base64
import io;

# إعداد التطبيق مع ورقة الأنماط الخارجية
app = dash.Dash(__name__, external_stylesheets=['assets/styles.css'])

# إعداد قاعدة البيانات
conn = sqlite3.connect('RetailDB_db.sqlite')
cursor = conn.cursor()
cursor.execute('''
    CREATE TABLE IF NOT EXISTS RetailDB
    (id INTEGER PRIMARY KEY, filename TEXT, filetype TEXT, filedata BLOB, upload_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP)
''')
conn.commit()
conn.close()

# دمج التصميمات
app.layout = html.Div([
    # الرأس وشريط التنقل والشريط الجانبي والمحتوى الرئيسي
    html.Div(className='header', children=[
    html.Div(className='dashboard-name', children='Retail Sector Analysis'),
    html.Div(className='page-title', children=[
        dcc.Link('Control Board', href='/Control_board'),
        dcc.Link('Dashboard', href='/dashboard'),
    ]),
]),

    html.Div(className='navbar', children=[
        html.Div(id='navbar-title', children='Dashboard'),
    ]),
    html.Div(className="sidebar"),
    dcc.Location(id='url', refresh=False),
    html.Div(id='page-content', className='main-content'),

    # أقسام إدارة الملفات
    html.Div(className='section', children=[
        html.H2('File Upload'),
        dcc.Upload(
            id='upload-data',
            children=html.Div(['Drag and Drop or ', html.A('Select Files')]),
            style={
                'width': '60%',
                'height': '60px',
                'lineHeight': '60px',
                'borderWidth': '1px',
                'borderStyle': 'dashed',
                'borderRadius': '5px',
                'textAlign': 'center',
                'margin': '10px'
            },
            multiple=False
        ),
        html.Button('Upload File', id='upload-button'),
        html.Button('Cancel', id='cancel-upload-button'),
        html.Div(id='file-info', style={'margin-top': '10px'}),
        html.Div(id='output-data-upload', style={'color': 'red'}),
    ]),
    html.Div(className='section', children=[
        html.H2('File Management'),
        html.Button('View Files', id='view-files-button'),
        html.Button('Delete ', id='delete-files-button'),
        html.Button('Cancel', id='cancel-button'),
        dash_table.DataTable(
            id='files-table',
            columns=[
                {'name': 'ID', 'id': 'id'},
                {'name': 'Filename', 'id': 'filename'},
                {'name': 'Filetype', 'id': 'filetype'},
                {'name': 'Upload Date', 'id': 'upload_date'}
            ],
            row_selectable='multi',
            filter_action="native"
        ),
        html.Div(id='delete-message', style={'color': 'green'})
    ]),
    html.Div(className='section', children=[
    html.H2('Data Cleaning'),
    html.Button('Clean Data', id='clean-data-button'),
    dash_table.DataTable(id='cleaning-results-table', columns=[
        {'name': 'Filename', 'id': 'filename'},
        {'name': 'Missing Values', 'id': 'missing_values'},
        {'name': 'Outliers', 'id': 'outliers'},
        {'name': 'Duplicates', 'id': 'duplicates'},
        {'name': 'Transformations', 'id': 'transformations'},
        {'name': 'Cleaned Rows', 'id': 'cleaned_rows'}
    ])
])

])

# Callback للتنقل بين الصفحات
@app.callback(
    Output('navbar-title', 'children'),
    Output('page-content', 'children'),
    Input('url', 'pathname')
)
def display_page(pathname):
    if pathname == '/about_retail_sector':
        return 'About Retail Sector', html.Div()
    elif pathname == '/Control_board':
        return 'Control Board', html.Div()
    else:
        return 'Dashboard', html.Div()

# Callback لرفع الملفات
@app.callback(
    Output('output-data-upload', 'children'),
    Input('upload-button', 'n_clicks'),
    State('upload-data', 'contents'),
    State('upload-data', 'filename'),
    State('upload-data', 'last_modified')
)
def upload_file(n_clicks, content, filename, last_modified):
    if n_clicks is None or content is None:
        return ''

    # تحقق من نوع الملف
    ALLOWED_TYPES = ['xls', 'csv', 'xlsx']
    if not filename.endswith(tuple(ALLOWED_TYPES)):
        return f'File type not allowed. Allowed types: {", ".join(ALLOWED_TYPES)}'

    try:
        content_type, content_string = content.split(',')
        decoded = base64.b64decode(content_string)

        conn = sqlite3.connect('RetailDB_db.sqlite')
        cursor = conn.cursor()
        cursor.execute("INSERT INTO RetailDB (filename, filetype, filedata) VALUES (?, ?, ?)", (filename, content_type, decoded))
        conn.commit()
        conn.close()

        return f"File {filename} uploaded successfully!"
    except Exception as e:
        return f"An error occurred: {str(e)}"

# Callback لتحديث معلومات الملف بعد الرفع
@app.callback(
    Output('file-info', 'children'),
    [Input('upload-data', 'contents')],
    [State('upload-data', 'filename'), State('upload-data', 'last_modified')]
)
def update_file_info(contents, filename, last_modified):
    if contents is None:
        return 'No file selected.'
    else:
        content_type, content_string = contents.split(',')
        decoded = base64.b64decode(content_string)
        size_in_mb = len(decoded) / (1024 )  # حجم الملف بالميغابايت

        return html.Div([
            html.P(f"File Name: {filename}"),
            html.P(f"File Size: {size_in_mb:.2f} KB")
        ])

# دمج Callbacks لعرض وحذف الملفات
# الدمج بين Callbacks لعرض وحذف الملفات
@app.callback(
    [Output('files-table', 'data'),
     Output('delete-message', 'children')],
    [Input('view-files-button', 'n_clicks'),
     Input('delete-files-button', 'n_clicks'),
     Input('cancel-button', 'n_clicks')],
    [State('files-table', 'selected_rows'),
     State('files-table', 'data')],
    prevent_initial_call=True
)
def update_and_delete_files(view_clicks, delete_clicks, cancel_clicks, selected_rows, rows):
    ctx = dash.callback_context

    if not ctx.triggered:
        raise dash.exceptions.PreventUpdate

    button_id = ctx.triggered[0]['prop_id'].split('.')[0]

    if button_id == 'view-files-button':
        conn = sqlite3.connect('RetailDB_db.sqlite')
        df = pd.read_sql_query("SELECT id, filename, filetype, upload_date FROM RetailDB", conn)
        conn.close()
        return df.to_dict('records'), ''

    elif button_id == 'delete-files-button':
        try:
            if not selected_rows:
                return dash.no_update, 'No file selected for deletion.'

            selected_ids = [rows[i]['id'] for i in selected_rows]
            conn = sqlite3.connect('RetailDB_db.sqlite')
            cursor = conn.cursor()
            cursor.executemany("DELETE FROM RetailDB WHERE id=?", [(id,) for id in selected_ids])
            conn.commit()
            conn.close()

            updated_rows = [row for row in rows if row['id'] not in selected_ids]
            return updated_rows, 'Selected RetailDB have been deleted.'
        except Exception as e:
            return dash.no_update, f'Error in deleting files: {str(e)}'

    elif button_id == 'cancel-button':
        return dash.no_update, ''

    else:
        raise dash.exceptions.PreventUpdate
    
    
@app.callback(
   
    Output('cleaning-results-table', 'data'),
    Input('clean-data-button', 'n_clicks'),
    prevent_initial_call=True
)
def clean_data(n_clicks):
    if n_clicks is None:
        raise dash.exceptions.PreventUpdate

    conn = sqlite3.connect('RetailDB_db.sqlite')
    cursor = conn.cursor()
    
    cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
    table_names = [name[0] for name in cursor.fetchall()]

    cleaning_results = []

    for table_name in table_names:
        cursor.execute(f"SELECT * FROM {table_name}")
        files = cursor.fetchall()

        for file_row in files:
            if len(file_row) < 3:
                continue

            file_id, filename, filedata = file_row[:3]

            # تحويل البيانات إلى كائن ثنائي إذا كانت في شكل نص
            if isinstance(filedata, str):
                filedata = filedata.encode('utf-8')

            try:
                df = pd.read_csv(io.BytesIO(filedata), encoding='utf-8')
            except UnicodeDecodeError:
                try:
                    df = pd.read_csv(io.BytesIO(filedata), encoding='ISO-8859-1')
                except Exception as e:
                    continue

            # تنظيف البيانات
            df = clean_dataframe(df)

            cleaned_rows = df.shape[0]

            cleaning_results.append({
                'filename': filename,
                'missing_values': count_missing_values(df),
                'outliers': detect_outliers(df),
                'duplicates': count_duplicates(df),
                'transformations': apply_transformations(df),
                'cleaned_rows': cleaned_rows
            })

    conn.close()
    return cleaning_results

# تعريف الوظائف المساعدة لتنظيف البيانات
def clean_dataframe(df):
    # معالجة القيم المفقودة
    df.fillna(method='ffill', inplace=True)
    
    # إزالة السجلات المكررة
    df.drop_duplicates(inplace=True)

    return df

def count_missing_values(df):
    return df.isnull().sum().sum()

def detect_outliers(df):
    # يمكنك تعريف كيفية اكتشاف القيم الشاذة هنا
    return "Not implemented"

def count_duplicates(df):
    return df.duplicated().sum()

def apply_transformations(df):
    # يمكنك تطبيق التحويلات هنا
    return "Not implemented"
if __name__ == '__main__':
    app.run_server(debug=True)