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from sklearn.metrics import pairwise_distances
import pandas as pd
import numpy as np
from sklearn.preprocessing import LabelEncoder
from sklearn.model_selection import train_test_split
from feature_engineering import *

processed_data=feature_engineering()

df=processed_data
label_enc = LabelEncoder()

df['role_name_encoded'] = label_enc.fit_transform(df['role_name'])
df['role_name_decoded'] = label_enc.inverse_transform(df['role_name_encoded'])

# Link the X vector with index
index = df.index.values

def get_top_5_person_who_resolved(df, row, distance_metric='cosine'):
    # Concatenate the input data into a single string
    input_data = ' '.join([str(row['ticket_category']), str(row['ticket_type']), str(row['ticket_item']),str(row['ticket_summary']),
                          str(row['ticket_severity']),str(row['resolution_sla_violated']),str(row['reopen_count']),
                          str(row['owner_user_id']),str(row['role_name_encoded']),str(row['ticket_resolution_time'])])

    # Calculate the pairwise distances between the input vector and X
    input_vector_x = np.array(list(row[['ticket_category', 'ticket_type', 'ticket_item','ticket_summary',
       'ticket_severity', 'resolution_sla_violated', 'reopen_count', 'owner_user_id','role_name_encoded','ticket_resolution_time']]))
    if distance_metric == 'cosine':
        distances = pairwise_distances(input_vector_x.reshape(1, -1), df[['ticket_category', 'ticket_type', 'ticket_item','ticket_summary',
       'ticket_severity', 'resolution_sla_violated', 'reopen_count', 'owner_user_id','role_name_encoded','ticket_resolution_time']], metric='cosine')[0]
    elif distance_metric == 'euclidean':
        distances = pairwise_distances(input_vector_x.reshape(1, -1), df[['ticket_category', 'ticket_type', 'ticket_item','ticket_summary',
       'ticket_severity', 'resolution_sla_violated', 'reopen_count', 'owner_user_id','role_name_encoded','ticket_resolution_time']], metric='euclidean')[0]
    elif distance_metric == 'manhattan':
        distances = pairwise_distances(input_vector_x.reshape(1, -1), df[['ticket_category', 'ticket_type', 'ticket_item','ticket_summary',
       'ticket_severity', 'resolution_sla_violated', 'reopen_count', 'owner_user_id','role_name_encoded','ticket_resolution_time']], metric='manhattan')[0]
    else:
        raise ValueError('Invalid distance metric')
    
    # Get the indices of the top 5 closest tickets
    closest_indices = np.argsort(distances)[:5]
    
    # Get the person_who_resolved, owner_user_id, and role_name values for the closest tickets
    closest_person_who_resolved = df.iloc[closest_indices]['person_who_resolved']
    closest_owner_user_id = df.iloc[closest_indices]['owner_user_id']
    closest_role_name_encoded = df.iloc[closest_indices]['role_name_encoded']
    closest_role_name_decoded = df.iloc[closest_indices]['role_name_decoded']
    
    # Get the actual person_who_resolved, owner_user_id, and role_name value for the input ticket
    actual_person_who_resolved = row['person_who_resolved']
    actual_owner_user_id = row['owner_user_id']
    actual_role_name_encoded = row['role_name_encoded']
    actual_role_name_decoded = row['role_name_decoded']

    return list(zip(closest_person_who_resolved, closest_owner_user_id, closest_role_name_decoded)), (actual_person_who_resolved, actual_owner_user_id, actual_role_name_decoded)


# Split the data into training and testing sets
train_data, test_data = train_test_split(df, test_size=0.2, random_state=42)

# Apply the function to each row of the test data to get the recommendations
test_data['recommendations'], test_data['actual_person_who_resolved'] = zip(*test_data.apply(lambda row: get_top_5_person_who_resolved(train_data, row), axis=1))

# Remove duplicate values from recommendations
test_data['recommendations'] = test_data['recommendations'].apply(lambda x: list(set(x)))

test_data.head()