src/streamlit_app.py

import os
os.environ['HF_HOME'] = '/tmp'
import time
import streamlit as st
import pandas as pd
import io
import plotly.express as px
import zipfile
import json
import string
from cryptography.fernet import Fernet
from streamlit_extras.stylable_container import stylable_container
from typing import Optional
from gliner import GLiNER
from comet_ml import Experiment



# --- Page Configuration and UI Elements ---
st.set_page_config(layout="wide", page_title="Named Entity Recognition App")
st.subheader("DataHarvest", divider="violet")
st.link_button("by nlpblogs", "https://nlpblogs.com", type="tertiary")
st.markdown(':rainbow[**Supported Languages: English**]')
expander = st.expander("**Important notes**")
expander.write("""**Named Entities:** This DataHarvest web app predicts nine (9) labels: "person", "country", "city", "organization", "date", "time", "cardinal", "money", "position"

Results are presented in easy-to-read tables, visualized in an interactive tree map, pie chart and bar chart, and are available for download along with a Glossary of tags.

**How to Use:** Type or paste your text into the text area below, then press Ctrl + Enter. Click the 'Results' button to extract and tag entities in your text data.

**Usage Limits:** You can request results unlimited times for one (1) month.

**Technical issues:** If your connection times out, please refresh the page or reopen the app's URL. 

For any errors or inquiries, please contact us at info@nlpblogs.com""")

with st.sidebar:
    st.write("Use the following code to embed the DataHarvest web app on your website. Feel free to adjust the width and height values to fit your page.")
    code = '''
    <iframe
	src="https://aiecosystem-dataharvest.hf.space"
	frameborder="0"
	width="850"
	height="450"
    ></iframe>

    '''
    st.code(code, language="html")
    st.text("")
    st.text("")
    st.divider()
    st.subheader("🚀 Ready to build your own AI Web App?", divider="violet")
    st.link_button("AI Web App Builder", "https://nlpblogs.com/build-your-named-entity-recognition-app/", type="primary")

# --- Comet ML Setup ---
COMET_API_KEY = os.environ.get("COMET_API_KEY")
COMET_WORKSPACE = os.environ.get("COMET_WORKSPACE")
COMET_PROJECT_NAME = os.environ.get("COMET_PROJECT_NAME")
comet_initialized = bool(COMET_API_KEY and COMET_WORKSPACE and COMET_PROJECT_NAME)
if not comet_initialized:
    st.warning("Comet ML not initialized. Check environment variables.")

# --- Label Definitions ---
labels = ["person", "country", "city", "organization", "date", "time", "cardinal", "money", "position"]
# Corrected mapping dictionary
# Create a mapping dictionary for labels to categories
category_mapping = {
    "People": ["person", "organization", "position"],
    "Locations": ["country", "city"],
    "Time": ["date", "time"],
    "Numbers": ["money", "cardinal"]}

# --- Model Loading ---
@st.cache_resource
def load_ner_model():
    """Loads the GLiNER model and caches it."""
    try:
        return GLiNER.from_pretrained("knowledgator/gliner-multitask-large-v0.5", nested_ner=True, num_gen_sequences=2, gen_constraints= labels)
    except Exception as e:
        st.error(f"Failed to load NER model. Please check your internet connection or model availability: {e}")
        st.stop()
model = load_ner_model()
# Flatten the mapping to a single dictionary
reverse_category_mapping = {label: category for category, label_list in category_mapping.items() for label in label_list}

# --- Text Input and Clear Button ---
word_limit = 200
text = st.text_area(f"Type or paste your text below (max {word_limit} words), and then press Ctrl + Enter", height=250, key='my_text_area')
word_count = len(text.split())
st.markdown(f"**Word count:** {word_count}/{word_limit}")

def clear_text():
    """Clears the text area."""
    st.session_state['my_text_area'] = ""

def remove_punctuation(text):
    """Removes punctuation from a string."""
    translator = str.maketrans('', '', string.punctuation)
    return text.translate(translator)

st.button("Clear text", on_click=clear_text)

# --- Results Section ---
if st.button("Results"):
    if not text.strip():
        st.warning("Please enter some text to extract entities.")
    elif word_count > word_limit:
        st.warning(f"Your text exceeds the {word_limit} word limit. Please shorten it to continue.")
    else:
        start_time = time.time()
        # Call the new function to remove punctuation from the input text
        cleaned_text = remove_punctuation(text)
        with st.spinner("Extracting entities...", show_time=True):
            # Use the cleaned text for prediction
            entities = model.predict_entities(cleaned_text, labels)
            df = pd.DataFrame(entities)
            if not df.empty:
                df['category'] = df['label'].map(reverse_category_mapping)
                if comet_initialized:
                    experiment = Experiment(
                        api_key=COMET_API_KEY,
                        workspace=COMET_WORKSPACE,
                        project_name=COMET_PROJECT_NAME,
                    )
                    experiment.log_parameter("input_text", text)
                    experiment.log_table("predicted_entities", df)
                st.subheader("Grouped Entities by Category", divider = "violet")
                # Create tabs for each category
                category_names = sorted(list(category_mapping.keys()))
                category_tabs = st.tabs(category_names)
                for i, category_name in enumerate(category_names):
                    with category_tabs[i]:
                        df_category_filtered = df[df['category'] == category_name]
                        if not df_category_filtered.empty:
                            st.dataframe(df_category_filtered.drop(columns=['category']), use_container_width=True)
                        else:
                            st.info(f"No entities found for the '{category_name}' category.")
                with st.expander("See Glossary of tags"):
                    st.write('''
                    - **text**: ['entity extracted from your text data']
                    - **score**: ['accuracy score; how accurately a tag has been assigned to a given entity']
                    - **label**: ['label (tag) assigned to a given extracted entity']
                    - **start**: ['index of the start of the corresponding entity']
                    - **end**: ['index of the end of the corresponding entity']
                    ''')
                st.divider()
                # Tree map
                st.subheader("Tree map", divider = "violet")
                fig_treemap = px.treemap(df, path=[px.Constant("all"), 'category', 'label', 'text'], values='score', color='category')
                fig_treemap.update_layout(margin=dict(t=50, l=25, r=25, b=25))
                st.plotly_chart(fig_treemap)
                # Pie and Bar charts
                grouped_counts = df['category'].value_counts().reset_index()
                grouped_counts.columns = ['category', 'count']
                col1, col2 = st.columns(2)
                with col1:
                    st.subheader("Pie chart", divider = "violet")
                    fig_pie = px.pie(grouped_counts, values='count', names='category', hover_data=['count'], labels={'count': 'count'}, title='Percentage of predicted categories')
                    fig_pie.update_traces(textposition='inside', textinfo='percent+label')
                    fig_pie.update_layout(
                    )
                    st.plotly_chart(fig_pie)
                with col2:
                    st.subheader("Bar chart", divider = "violet")
                    fig_bar = px.bar(grouped_counts, x="count", y="category", color="category", text_auto=True, title='Occurrences of predicted categories')
                    fig_bar.update_layout(  # Changed from fig_pie to fig_bar
                    )
                    st.plotly_chart(fig_bar)
                # Most Frequent Entities
                st.subheader("Most Frequent Entities", divider="violet")
                word_counts = df['text'].value_counts().reset_index()
                word_counts.columns = ['Entity', 'Count']
                repeating_entities = word_counts[word_counts['Count'] > 1]
                if not repeating_entities.empty:
                    st.dataframe(repeating_entities, use_container_width=True)
                    fig_repeating_bar = px.bar(repeating_entities, x='Entity', y='Count', color='Entity')
                    fig_repeating_bar.update_layout(xaxis={'categoryorder': 'total descending'},
                    )
                    st.plotly_chart(fig_repeating_bar)
                else:
                    st.warning("No entities were found that occur more than once.")
                # Download Section
                st.divider()
                dfa = pd.DataFrame(
                    data={
                        'Column Name': ['text', 'label', 'score', 'start', 'end'],
                        'Description': [
                            'entity extracted from your text data',
                            'label (tag) assigned to a given extracted entity',
                            'accuracy score; how accurately a tag has been assigned to a given entity',
                            'index of the start of the corresponding entity',
                            'index of the end of the corresponding entity',
                        ]
                    }
                )
                buf = io.BytesIO()
                with zipfile.ZipFile(buf, "w") as myzip:
                    myzip.writestr("Summary of the results.csv", df.to_csv(index=False))
                    myzip.writestr("Glossary of tags.csv", dfa.to_csv(index=False))
                with stylable_container(
                    key="download_button",
                    css_styles="""button { background-color: red; border: 1px solid black; padding: 5px; color: white; }""",
                ):
                    st.download_button(
                        label="Download results and glossary (zip)",
                        data=buf.getvalue(),
                        file_name="nlpblogs_results.zip",
                        mime="application/zip",
                    )
                if comet_initialized:
                    experiment.log_figure(figure=fig_treemap, figure_name="entity_treemap_categories")
                    experiment.end()
            
                # Corrected placement for time calculation and display
                end_time = time.time()
                elapsed_time = end_time - start_time
                st.text("")
                st.text("")
                st.info(f"Results processed in **{elapsed_time:.2f} seconds**.")
            else: # If df is empty
                st.warning("No entities were found in the provided text.")