import streamlit as st
import pandas as pd
from transformers import pipeline
from stqdm import stqdm
from simplet5 import SimpleT5
from transformers import AutoTokenizer, AutoModelForSeq2SeqLM
from transformers import BertTokenizer
from tensorflow.keras.models import load_model
from tensorflow.nn import softmax
import numpy as np
from datetime import datetime
import logging

date = datetime.now().strftime(r"%Y-%m-%d")
model_classes = {
    {0: 'Ads',
 1: 'Apps',
 2: 'Battery',
 3: 'Charging',
 4: 'Delivery',
 5: 'Display',
 6: 'FOS',
 7: 'HW',
 8: 'Order',
 9: 'Refurb',
 10: 'SD',
 11: 'Setup',
 12: 'Unknown'}

@st.cache
def load_t5():
    model = AutoModelForSeq2SeqLM.from_pretrained("t5-base")

    tokenizer = AutoTokenizer.from_pretrained("t5-base")
    return model, tokenizer


@st.cache
def custom_model():
    return pipeline("summarization", model="my_awesome_sum/")


@st.cache
def convert_df(df):
    # IMPORTANT: Cache the conversion to prevent computation on every rerun
    return df.to_csv(index=False).encode("utf-8")


@st.cache
def load_one_line_summarizer(model):
    return model.load_model("t5", "snrspeaks/t5-one-line-summary")


@st.cache
def classify_category():
    tokenizer = BertTokenizer.from_pretrained("bert-base-uncased")
    new_model = load_model("model")
    return tokenizer, new_model


st.set_page_config(layout="wide", page_title="Amazon Review Summarizer")
st.title("Amazon Review Summarizer")

uploaded_file = st.file_uploader("Choose a file", type=["xlsx", "xls", "csv"])
summarizer_option = st.selectbox(
    "Select Summarizer",
    ("Custom trained on the dataset", "t5-base", "t5-one-line-summary"),
)
classification = st.checkbox("Classify Category", value=True)
hide_streamlit_style = """
            <style>
            #MainMenu {visibility: hidden;}
            footer {visibility: hidden;}
            </style>
            """
st.markdown(hide_streamlit_style, unsafe_allow_html=True)

ps = st.empty()
if st.button("Process",type="primary"):
    if uploaded_file is not None:
        if uploaded_file.name.split(".")[-1] in ["xls", "xlsx"]:

            df = pd.read_excel(uploaded_file, engine="openpyxl")
        if uploaded_file.name.split(".")[-1] in [".csv"]:
            df = pd.read_csv(uploaded_file)
        columns = df.columns.values.tolist()
        columns = [x.lower() for x in columns]
        df.columns = columns
        print(summarizer_option)

        try:
            text = df["text"].values.tolist()
            if summarizer_option == "Custom trained on the dataset":
                model = custom_model()

                progress_text = "Summarization in progress. Please wait."
                summary = []

                for x in stqdm(range(len(text))):
                    try:
                        summary.append(
                            model(
                                f"summarize: {text[x]}",
                                max_length=50,
                                early_stopping=True,
                            )[0]["summary_text"]
                        )
                    except:
                        pass
                output = pd.DataFrame(
                    {"text": df["text"].values.tolist(), "summary": summary}
                )
                if classification:
                    classification_token, classification_model = classify_category()
                    tf_batch = classification_token(
                        text,
                        max_length=128,
                        padding=True,
                        truncation=True,
                        return_tensors="tf",
                    )
                    with st.spinner(text="identifying theme"):
                        tf_outputs = classification_model(tf_batch)
                    classes = []
                    with st.spinner(text="creating output file"):
                        for x in stqdm(range(len(text))):
                            tf_o = softmax(tf_outputs["logits"][x], axis=-1)
                            label = np.argmax(tf_o, axis=0)
                            keys = model_classes
                            classes.append(keys.get(label))
                        output["category"] = classes

                csv = convert_df(output)
                st.download_button(
                    label="Download data as CSV",
                    data=csv,
                    file_name=f"{summarizer_option}_{date}_df.csv",
                    mime="text/csv",
                )
            if summarizer_option == "t5-base":
                model, tokenizer = load_t5()
                summary = []
                for x in stqdm(range(len(text))):

                    tokens_input = tokenizer.encode(
                        "summarize: " + text[x],
                        return_tensors="pt",
                        max_length=tokenizer.model_max_length,
                        truncation=True,
                    )
                    summary_ids = model.generate(
                        tokens_input,
                        min_length=80,
                        max_length=150,
                        length_penalty=20,
                        num_beams=2,
                    )
                    summary_gen = tokenizer.decode(
                        summary_ids[0], skip_special_tokens=True
                    )
                    summary.append(summary_gen)

                output = pd.DataFrame(
                    {"text": df["text"].values.tolist(), "summary": summary}
                )
                if classification:
                    classification_token, classification_model = classify_category()
                    tf_batch = classification_token(
                        text,
                        max_length=128,
                        padding=True,
                        truncation=True,
                        return_tensors="tf",
                    )
                    with st.spinner(text="identifying theme"):
                        tf_outputs = classification_model(tf_batch)
                    classes = []
                    with st.spinner(text="creating output file"):
                        for x in stqdm(range(len(text))):
                            tf_o = softmax(tf_outputs["logits"][x], axis=-1)
                            label = np.argmax(tf_o, axis=0)
                            keys = model_classes
                            classes.append(keys.get(label))
                        output["category"] = classes

                csv = convert_df(output)
                st.download_button(
                    label="Download data as CSV",
                    data=csv,
                    file_name=f"{summarizer_option}_{date}_df.csv",
                    mime="text/csv",
                )

            if summarizer_option == "t5-one-line-summary":
                model = SimpleT5()
                load_one_line_summarizer(model=model)

                summary = []
                for x in stqdm(range(len(text))):
                    try:
                        summary.append(model.predict(text[x])[0])
                    except:
                        pass
                output = pd.DataFrame(
                    {"text": df["text"].values.tolist(), "summary": summary}
                )
                if classification:
                    classification_token, classification_model = classify_category()
                    tf_batch = classification_token(
                        text,
                        max_length=128,
                        padding=True,
                        truncation=True,
                        return_tensors="tf",
                    )
                    with st.spinner(text="identifying theme"):
                        tf_outputs = classification_model(tf_batch)
                    classes = []
                    with st.spinner(text="creating output file"):
                        for x in stqdm(range(len(text))):
                            tf_o = softmax(tf_outputs["logits"][x], axis=-1)
                            label = np.argmax(tf_o, axis=0)
                            keys = model_classes
                            classes.append(keys.get(label))
                        output["category"] = classes

                csv = convert_df(output)
                st.download_button(
                    label="Download data as CSV",
                    data=csv,
                    file_name=f"{summarizer_option}_{date}_df.csv",
                    mime="text/csv",
                )

        except KeyError:
            st.error(
                "Please Make sure that your data must have a column named text",
                icon="🚨",
            )
            st.info("Text column must have amazon reviews", icon="ℹ️")
        except BaseException as e:
            logging.exception("An exception was occurred")