import pandas as pd
import streamlit as st
import datasets
import plotly.express as px
from sentence_transformers import SentenceTransformer, util
import os
from pandas.api.types import (
    is_categorical_dtype,
    is_datetime64_any_dtype,
    is_numeric_dtype,
    is_object_dtype,
)
import subprocess

st.set_page_config(layout="wide")

model_dir = "./models/sbert.net_models_sentence-transformers_clip-ViT-B-32-multilingual-v1"

@st.cache_data(show_spinner=True)
def download_models():
    # Directory doesn't exist, download and extract the model
    subprocess.run(["mkdir", "models"])
    subprocess.run(["wget", "--no-check-certificate", "https://public.ukp.informatik.tu-darmstadt.de/reimers/sentence-transformers/v0.2/clip-ViT-B-32-multilingual-v1.zip"], check=True)
    subprocess.run(["unzip", "-q", "clip-ViT-B-32-multilingual-v1.zip", "-d", model_dir], check=True)

# Check if the directory exists
if not os.path.exists(model_dir):
    download_models()

token = os.getenv('token')


@st.cache_data(show_spinner=True)
def load_dataset():
    dataset = datasets.load_dataset('rjadr/ditaduranuncamais', split='train', use_auth_token=token)
    dataset.add_faiss_index(column="txt_embs")
    dataset.add_faiss_index(column="img_embs")
    dataset = dataset.remove_columns(['Post Created Date','Post Created Time','Type','Like and View Counts Disabled','Link','Photo','Title','Sponsor Id','Sponsor Name'])
    return dataset

@st.cache_data(show_spinner=False)
def load_dataframe(_dataset):
    dataframe = _dataset.remove_columns(['txt_embs', 'img_embs', 'image_base64']).to_pandas()
    return dataframe

@st.cache_resource(show_spinner=True)
def load_img_model():
    # We use the original clip-ViT-B-32 for encoding images
    return SentenceTransformer('clip-ViT-B-32')

@st.cache_resource(show_spinner=True)
def load_txt_model():
    # Our text embedding model is aligned to the img_model and maps 50+
    # languages to the same vector space
    return SentenceTransformer('./models/sbert.net_models_sentence-transformers_clip-ViT-B-32-multilingual-v1')

def filter_dataframe(df: pd.DataFrame) -> pd.DataFrame:
    """
    Adds a UI on top of a dataframe to let viewers filter columns

    Args:
        df (pd.DataFrame): Original dataframe

    Returns:
        pd.DataFrame: Filtered dataframe
    """
    modify = st.checkbox("Add filters")

    if not modify:
        return df

    df = df.copy()

    # Try to convert datetimes into a standard format (datetime, no timezone)
    for col in df.columns:
        if is_object_dtype(df[col]):
            try:
                df[col] = pd.to_datetime(df[col])
            except Exception:
                pass

        if is_datetime64_any_dtype(df[col]):
            df[col] = df[col].dt.tz_localize(None)

    modification_container = st.container()

    with modification_container:
        to_filter_columns = st.multiselect("Filter dataframe on", df.columns)
        for column in to_filter_columns:
            left, right = st.columns((1, 20))
            left.write("↳")
            # Treat columns with < 10 unique values as categorical
            if is_categorical_dtype(df[column]) or df[column].nunique() < 10:
                user_cat_input = right.multiselect(
                    f"Values for {column}",
                    df[column].unique(),
                    default=list(df[column].unique()),
                )
                df = df[df[column].isin(user_cat_input)]
            elif is_numeric_dtype(df[column]):
                _min = float(df[column].min())
                _max = float(df[column].max())
                step = (_max - _min) / 100
                user_num_input = right.slider(
                    f"Values for {column}",
                    _min,
                    _max,
                    (_min, _max),
                    step=step,
                )
                df = df[df[column].between(*user_num_input)]
            elif is_datetime64_any_dtype(df[column]):
                user_date_input = right.date_input(
                    f"Values for {column}",
                    value=(
                        df[column].min(),
                        df[column].max(),
                    ),
                )
                if len(user_date_input) == 2:
                    user_date_input = tuple(map(pd.to_datetime, user_date_input))
                    start_date, end_date = user_date_input
                    df = df.loc[df[column].between(start_date, end_date)]
            else:
                user_text_input = right.text_input(
                    f"Substring or regex in {column}",
                )
                if user_text_input:
                    df = df[df[column].str.contains(user_text_input)]

    return df

@st.cache_data
def get_image_embs(image):
    """
    Get image embeddings
    Parameters:
    uploaded_file (PIL.Image): Uploaded image file
    Returns:
    img_emb (np.array): Image embeddings
    """
    img_emb = image_model.encode(image, convert_to_tensor=True)
    return img_emb

@st.cache_data(show_spinner=False)
def get_text_embs(text):
    """
    Get text embeddings
    Parameters:
    text (str): Text to encode
    Returns:
    text_emb (np.array): Text embeddings
    """
    txt_emb = text_model.encode(text, convert_to_tensor=True)
    return txt_emb

@st.cache_data
def postprocess_results(scores, samples):
    """
    Postprocess results to tuple of labels and scores
    Parameters:
    scores (np.array): Scores
    samples (datasets.Dataset): Samples
    Returns:
    labels (list): List of tuples of PIL images and labels/scores
    """
    samples_df = pd.DataFrame.from_dict(samples)
    samples_df["scores"] = scores
    samples_df["scores"] = (1 - (samples_df["scores"] - samples_df["scores"].min()) / (
            samples_df["scores"].max() - samples_df["scores"].min())) * 100
    samples_df["scores"] = samples_df["scores"].astype(int)
    samples_df.reset_index(inplace=True, drop=True)
    samples_df['label'] = samples_df['text_full'] + ' (' + samples_df['scores'].astype(str) + '%)'
    return samples_df.drop(columns=['txt_embs', 'img_embs'])

@st.cache_data
def text_to_text(text, k=5):
    """
    Text to text
    Parameters:
    text (str): Input text
    k (int): Number of top results to return
    Returns:
    results (list): List of tuples of PIL images and labels/scores
    """
    text_emb = get_text_embs(text)
    scores, samples = dataset.get_nearest_examples('txt_embs', text_emb, k=k)
    return postprocess_results(scores, samples)

@st.cache_data
def image_to_text(image, k=5):
    """
    Image to text
    Parameters:
    image (str): Temp filepath to image
    k (int): Number of top results to return
    Returns:
    results (list): List of tuples of PIL images and labels/scores
    """
    img_emb = get_image_embs(image.name)
    scores, samples = dataset.get_nearest_examples('txt_embs', img_emb, k=k)
    return postprocess_results(scores, samples)

@st.cache_data
def text_to_image(text, k=5):
    """
    Text to image
    Parameters:
    text (str): Input text
    k (int): Number of top results to return
    Returns:
    results (list): List of tuples of PIL images and labels/scores
    """
    text_emb = get_text_embs(text)
    scores, samples = dataset.get_nearest_examples('img_embs', text_emb, k=k)
    return postprocess_results(scores, samples)

@st.cache_data
def image_to_image(image, k=5):
    """
    Image to image
    Parameters:
    image (str): Temp filepath to image
    k (int): Number of top results to return
    Returns:
    results (list): List of tuples of PIL images and labels/scores
    """
    img_emb = get_image_embs(image.name)
    scores, samples = dataset.get_nearest_examples('img_embs', img_emb, k=k)
    return postprocess_results(scores, samples)

dataset = load_dataset()
df = load_dataframe(dataset)
image_model = load_img_model()
text_model = load_txt_model()

st.title("#ditaduranuncamais Data Explorer")
st.title(f'My first app {st.__version__}')

tab1, tab2, tab3 = st.tabs(["Data exploration", "Semantic search", "Stats"])

with tab1:
    st.dataframe(
        data=filter_dataframe(df),
    # use_container_width=True,
        column_config={
            "Download URL": st.column_config.ImageColumn(
                "image", help="Instagram image"
            ),
            "URL": st.column_config.LinkColumn(
                "link", help="Instagram link", width="small"
            )
        },
        hide_index=True,
    )

with tab2:
    tabs = ["Text to Text", "Text to Image", "Image to Image", "Image to Text"]
    selected_tab = st.radio("Select a search type", tabs)

    if selected_tab == "Text to Text":
        text_to_text_input = st.text_input("Enter text")
        text_to_text_k_top = st.slider("Number of results", 1, 20, 8)
        if st.button("Search"):
            st.dataframe(
                data=text_to_text(text_to_text_input, text_to_text_k_top),
                column_config={
                "Download URL": st.column_config.ImageColumn(
                    "image", help="Instagram image"
                ),
                "URL": st.column_config.LinkColumn(
                    "link", help="Instagram link", width="small"
                )
                },
                hide_index=True,
            )   
            
    elif selected_tab == "Text to Image":
        text_to_image_input = st.text_input("Enter text")
        text_to_image_k_top = st.slider("Number of results", 1, 20, 8)
        if st.button("Search"):
            st.dataframe(
                data=text_to_image(text_to_image_input, text_to_image_k_top),
                column_config={
                    "Download URL": st.column_config.ImageColumn(
                        "image", help="Instagram image"
                    ),
                    "URL": st.column_config.LinkColumn(
                        "link", help="Instagram link", width="small"
                    )
                },
                hide_index=True,
            )

    elif selected_tab == "Image to Image":
        image_to_image_k_top = st.slider("Number of results", 1, 20, 8)
        image_to_image_input = st.file_uploader("Upload an image", type=["jpg", "jpeg", "png"])
        if st.button("Search"):
            st.dataframe(
                data=image_to_image(image_to_image_input, image_to_image_k_top),
                column_config={
                    "Download URL": st.column_config.ImageColumn(
                        "image", help="Instagram image"
                    ),
                    "URL": st.column_config.LinkColumn(
                        "link", help="Instagram link", width="small"
                    )
                },
                hide_index=True,
            )

    elif selected_tab == "Image to Text":
        image_to_text_k_top = st.slider("Number of results", 1, 20, 8)
        image_to_text_input = st.file_uploader("Upload an image", type=["jpg", "jpeg", "png"])
        if st.button("Search"):
            st.dataframe(
                data=image_to_text(image_to_text_input, image_to_text_k_top),
                column_config={
                    "Download URL": st.column_config.ImageColumn(
                        "image", help="Instagram image"
                    ),
                    "URL": st.column_config.LinkColumn(
                        "link", help="Instagram link", width="small"
                    )
                },
                hide_index=True,
            )   
            
with tab3:
    st.markdown("### Time Series Analysis")
    # Dropdown to select variables
    variable = st.selectbox('Select Variable', ['Total Interactions', 'Likes', 'Comments', 'Overperforming Score (weighted — Likes 1x Comments 1x )'])

    # Dropdown to select time resampling
    resample_dict = {
        'Day': 'D',
        'Three Days': '3D',
        'Week': 'W',
        'Two Weeks': '2W',
        'Month': 'M',
        'Quarter': 'Q',
        'Year': 'Y'
    }

    # Dropdown to select time resampling
    resample_time = st.selectbox('Select Time Resampling', list(resample_dict.keys()))

    df_filtered = df.set_index('Post Created Date')

    # Slider for date range selection
    min_date = df_filtered.index.min().date()
    max_date = df_filtered.index.max().date()

    date_range = st.slider('Select Date Range', min_value=min_date, max_value=max_date, value=(min_date, max_date))

    # Filter dataframe based on selected date range
    df_filtered = df_filtered[(df_filtered.index.date >= date_range[0]) & (df_filtered.index.date <= date_range[1])]

    # Resample and plot
    df_filtered = df_filtered[variable].resample(resample_dict[resample_time]).sum()
    st.line_chart(df_filtered)

    # Dropdown to select variables for scatter plot
    scatter_variable_1 = st.selectbox('Select Variable 1 for Scatter Plot', ['num_comments', 'score', 'cosine'])
    scatter_variable_2 = st.selectbox('Select Variable 2 for Scatter Plot', ['num_comments', 'score', 'cosine'])

    # Plot scatter chart
    st.write(f"Scatter Plot of {scatter_variable_1} vs {scatter_variable_2}")
    # Plot scatter chart
    scatter_fig = px.scatter(df, x=scatter_variable_1, y=scatter_variable_2)
    st.plotly_chart(scatter_fig)