from logging import PlaceHolder
import pandas as pd
from fuzzywuzzy import fuzz
import numpy as np
import streamlit as st
import pyodbc
from streamlit_extras.stateful_button import button
import pymssql
############
from streamlit_app import sidebar

st.set_page_config(page_title='DUPLICATE RECORDS DETECTION', layout= 'wide')

######
def main():
    # st.title('PAGE TITLE')  # Change this for each page
    sidebar()
########

    st.title('Detect Duplicate Records')
    st.subheader('SELECT TABLE')
    conn = pymssql.connect( "Server=sql-ext-dev-uks-001.database.windows.net;"
                            "Database=sqldb-ext-dev-uks-001;"
                            "UID=dbadmin;"
                            "PWD=mYpa$$w0rD" )
    query1="select * from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA='dbo' ORDER BY TABLE_NAME ASC"
    table1=pd.read_sql_query(query1,con=conn)
    table1['TABLE_NAME']=table1['TABLE_NAME'].astype('str')
    table_selector=st.selectbox('SOURCE TABLE NAME',['TCM', 'TCVM','TEM', 'TPM', 'TPP', 'TPT', 'TRM', 'TSCM', 'TSM'],index=None,placeholder='Select table for automated column mapping')
    btn11=button('RUN',key='run11')
    if table_selector is not None and btn11:
        st.markdown('---')
        query2="select * from [dbo].["+table_selector+"]"
        df = pd.read_sql_query(query2,con=conn)
        conn.close()
        st.subheader('Data Preview')
        data1=df.copy()
        if set(['ID','LOADID','FILE_NAME']).issubset(df.columns):
            df=df.drop(['ID','LOADID','FILE_NAME'],axis=1)

        df = df.replace(r'^\s*$', np.nan, regex=True)
        if 'SORTL' in df.columns.values.tolist():
            df.drop('SORTL',axis=1,inplace=True)
        main_col=st.multiselect('PLEASE PROVIDE CONTEXT FOR DEDUPLICATION',df.columns.values.tolist(),placeholder='Select entity for deduplication')
        if main_col:
            mp = df.isnull().mean()*100                               ## Missing Percentage
            col = mp[mp<20].index.tolist()
            print(col)
            up = df[col].apply(lambda x: len(x.unique())/len(x)*100)  ## Unique Percentage
            up.sort_values(ascending=False,inplace=True)
            col = up[(up>=25)&(up<=75)].index.tolist()
            df=df.replace(np.nan,'')
            if len(main_col)>1:
                if bool(set(col)&set(main_col)):
                    col=list(set(col)-set(main_col))
                df['main_column']=''
                df['main_column']=df['main_column'].astype(str)
                st.markdown('---')
                st.write('Note: Main_column comprises of concatenated data of above selected context columns')
                for i,val in enumerate(main_col):
                    df[main_col[i]]=df[main_col[i]].astype(str)
                    df['main_column']=df['main_column']+'_'+df[main_col[i]]
                col.insert(0,'main_column')
                rem_col=list(set(df.columns.values.tolist())-set(col))
            else:
                if main_col[0] in col:
                    col.remove(main_col[0])
                col.insert(0,main_col[0])
                rem_col=list(set(df.columns.values.tolist())-set(col))
            
            st.write('COLUMNS SUGGESTED BY AI FOR DETERMINING DUPLICATES:\n',pd.DataFrame(col,columns=['Column Name']))
            more_col=st.multiselect('DO YOU WANT TO INCLUDE ANY MORE COLUMN(s)',rem_col,placeholder='Select optional columns to check for potential duplicates')
            button1=button('CHECK DUPLICATES', key='btn12')
            if button1:
                if more_col:
                    col=col+more_col
                grp_col = [x+'_based_group' for x in col]
                sort_col=[]
                last_row_index = len(df)-1
                print(col)
                threshold=80                                              ## Threshold is set to 80
                for j in range(len(col)):
                    df[col[j]]=df[col[j]].astype(str)
                    df[col[j]]=df[col[j]].str.upper()
                    df[col[j]] = df[col[j]].replace(np.nan, '', regex=True)
                    sort_col = sort_col+[col[j]]
                    df.sort_values(sort_col, inplace=True)
                    df = df.reset_index(drop=True)
                    fuzz_col = col[j]+'_fuzzy_ratio'
                    df.at[0,fuzz_col]=100
                    df.at[last_row_index,fuzz_col]=100
                    for i in range(1,last_row_index):
                        current = df[col[j]].iloc[i]
                        previous = df[col[j]].iloc[i-1]
                        fuzzy_ratio = fuzz.ratio(previous,current)
                        df.at[i,fuzz_col] = fuzzy_ratio
                    df[fuzz_col] = pd.to_numeric(df[fuzz_col], errors='coerce')
                    group_counter = 1
                    fuzz_group = col[j]+'_based_group'
                    df.at[0,fuzz_group] = group_counter
                    group = df.at[0,fuzz_group]
                    for i in range (1, len(df)):
                        if df.at[i,fuzz_col] > threshold:
                            df.at[i,fuzz_group] = df.at[i-1,fuzz_group]
                        else:
                            if j>=1:
                                if df.at[i,col[j-1]+'_fuzzy_ratio'] != group:
                                    group_counter = 1
                                    group = df.at[i,col[j-1]+'_based_group']
                                else:
                                    group_counter +=1
                            else:
                                group_counter += 1
                        df.at[i,fuzz_group] = group_counter
                    #threshold=threshold*0.9
                df['Potential_Duplicate_Cluster'] = df[grp_col].astype(int).astype(str).agg('_'.join, axis=1)
                df['DUPLICATES?']=df.duplicated(subset='Potential_Duplicate_Cluster',keep=False).map({True:'Y',False:'N'})
                df = df[df['DUPLICATES?']=='Y']
                # Define a function to apply the style
                def highlight_y(val):
                    color = 'lightcoral' if val=='Y' else 'white'
                    return f'background-color: {color}'

                # Apply styles
                styled_df = df.style.applymap(highlight_y,subset=['DUPLICATES?'])
                
                st.markdown('---')
                st.subheader('Results')
                #st.write(styled_df)
                edited_df=st.data_editor(styled_df,num_rows='dynamic')
                
                #out=df.to_csv()
                #st.download_button(label='DOWNLOAD DUPLICATE CLUSTER DATA',data=out, file_name='Duplicate_Clusters.csv',mime='text/csv')

            

######
if __name__ == '__main__':
    main()