import requests
import logging
import duckdb
from gradio_huggingfacehub_search import HuggingfaceHubSearch
from bertopic import BERTopic
import pandas as pd
import gradio as gr
from bertopic.representation import KeyBERTInspired
from umap import UMAP

# from cuml.cluster import HDBSCAN
# from cuml.manifold import UMAP
from sentence_transformers import SentenceTransformer

logging.basicConfig(
    level=logging.INFO, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)


session = requests.Session()


def get_parquet_urls(dataset, config, split):
    parquet_files = session.get(
        f"https://datasets-server.huggingface.co/parquet?dataset={dataset}&config={config}&split={split}",
        timeout=20,
    ).json()
    if "error" in parquet_files:
        raise Exception(f"Error fetching parquet files: {parquet_files['error']}")
    parquet_urls = [file["url"] for file in parquet_files["parquet_files"]]
    logging.debug(f"Parquet files: {parquet_urls}")
    return ",".join(f"'{url}'" for url in parquet_urls)


def get_docs_from_parquet(parquet_urls, column, offset, limit):
    SQL_QUERY = f"SELECT {column} FROM read_parquet([{parquet_urls}]) LIMIT {limit} OFFSET {offset};"
    df = duckdb.sql(SQL_QUERY).to_df()
    logging.debug(f"Dataframe: {df.head(5)}")
    return df[column].tolist()


def generate_topics(dataset, config, split, column, nested_column):
    logging.info(
        f"Generating topics for {dataset} with config {config} {split} {column} {nested_column}"
    )

    parquet_urls = get_parquet_urls(dataset, config, split)
    limit = 1_000
    chunk_size = 300
    offset = 0
    representation_model = KeyBERTInspired()
    base_model = None
    # docs = get_docs_from_parquet(parquet_urls, column, offset, chunk_size)

    # base_model = BERTopic(
    #     "english", representation_model=representation_model, min_topic_size=15
    # )
    # base_model.fit_transform(docs)

    # yield base_model.get_topic_info(), base_model.visualize_topics()
    # Create instances of GPU-accelerated UMAP and HDBSCAN
    # umap_model = UMAP(n_components=5, n_neighbors=15, min_dist=0.0)
    # hdbscan_model = HDBSCAN(min_samples=10, gen_min_span_tree=True)
    sentence_model = SentenceTransformer("all-MiniLM-L6-v2", device="cuda")
    while True:
        docs = get_docs_from_parquet(parquet_urls, column, offset, chunk_size)
        logging.info(f"------------> New chunk data {offset=} {chunk_size=}")
        embeddings = sentence_model.encode(docs, show_progress_bar=True, batch_size=100)
        logging.info(f"Embeddings shape: {embeddings.shape}")
        offset = offset + chunk_size
        if not docs or offset >= limit:
            break

        new_model = BERTopic(
            "english",
            embedding_model=sentence_model,
            representation_model=representation_model,
            min_topic_size=15,  # umap_model=umap_model, hdbscan_model=hdbscan_model
        )
        logging.info("Fitting new model")
        new_model.fit(docs, embeddings)
        logging.info("End fitting new model")
        if base_model is not None:
            updated_model = BERTopic.merge_models([base_model, new_model])
            nr_new_topics = len(set(updated_model.topics_)) - len(
                set(base_model.topics_)
            )
            new_topics = list(updated_model.topic_labels_.values())[-nr_new_topics:]
            logging.info("The following topics are newly found:")
            logging.info(f"{new_topics}\n")
            base_model = updated_model
        else:
            base_model = new_model
        logging.info(base_model.get_topic_info())
        reduced_embeddings = UMAP(
            n_neighbors=10, n_components=2, min_dist=0.0, metric="cosine"
        ).fit_transform(embeddings)
        logging.info(f"Reduced embeddings shape: {reduced_embeddings.shape}")
        yield (
            base_model.get_topic_info(),
            new_model.visualize_documents(
                docs, embeddings=embeddings
            ), # TODO: Visualize the merged models  
        ) 
    logging.info("Finished processing all data")
    return base_model.get_topic_info(), base_model.visualize_topics()


with gr.Blocks() as demo:
    gr.Markdown(
        """
        # 💠 Dataset Topic Discovery 🔭
        ## Select dataset and text column
        """
    )
    with gr.Row():
        with gr.Column(scale=3):
            dataset_name = HuggingfaceHubSearch(
                label="Hub Dataset ID",
                placeholder="Search for dataset id on Huggingface",
                search_type="dataset",
            )
        subset_dropdown = gr.Dropdown(label="Subset", visible=False)
        split_dropdown = gr.Dropdown(label="Split", visible=False)

    with gr.Accordion("Dataset preview", open=False):

        @gr.render(inputs=[dataset_name, subset_dropdown, split_dropdown])
        def embed(name, subset, split):
            html_code = f"""
            <iframe
              src="https://huggingface.co/datasets/{name}/embed/viewer/{subset}/{split}"
              frameborder="0"
              width="100%"
              height="600px"
            ></iframe>
                """
            return gr.HTML(value=html_code)

    with gr.Row():
        text_column_dropdown = gr.Dropdown(label="Text column name")
        nested_text_column_dropdown = gr.Dropdown(
            label="Nested text column name", visible=False
        )

    generate_button = gr.Button("Generate Notebook", variant="primary")

    gr.Markdown("## Topics info")
    topics_df = gr.DataFrame(interactive=False, visible=True)
    topics_plot = gr.Plot()
    generate_button.click(
        generate_topics,
        inputs=[
            dataset_name,
            subset_dropdown,
            split_dropdown,
            text_column_dropdown,
            nested_text_column_dropdown,
        ],
        outputs=[topics_df, topics_plot],
    )

    # TODO: choose num_rows, random, or offset -> By default limit max to 1176 rows
    # -> From the article, it could be in GPU 1176/sec

    def _resolve_dataset_selection(
        dataset: str, default_subset: str, default_split: str, text_feature
    ):
        if "/" not in dataset.strip().strip("/"):
            return {
                subset_dropdown: gr.Dropdown(visible=False),
                split_dropdown: gr.Dropdown(visible=False),
                text_column_dropdown: gr.Dropdown(label="Text column name"),
                nested_text_column_dropdown: gr.Dropdown(visible=False),
            }
        info_resp = session.get(
            f"https://datasets-server.huggingface.co/info?dataset={dataset}", timeout=20
        ).json()
        if "error" in info_resp:
            return {
                subset_dropdown: gr.Dropdown(visible=False),
                split_dropdown: gr.Dropdown(visible=False),
                text_column_dropdown: gr.Dropdown(label="Text column name"),
                nested_text_column_dropdown: gr.Dropdown(visible=False),
            }
        subsets: list[str] = list(info_resp["dataset_info"])
        subset = default_subset if default_subset in subsets else subsets[0]
        splits: list[str] = list(info_resp["dataset_info"][subset]["splits"])
        split = default_split if default_split in splits else splits[0]
        features = info_resp["dataset_info"][subset]["features"]

        def _is_string_feature(feature):
            return isinstance(feature, dict) and feature.get("dtype") == "string"

        text_features = [
            feature_name
            for feature_name, feature in features.items()
            if _is_string_feature(feature)
        ]
        nested_features = [
            feature_name
            for feature_name, feature in features.items()
            if isinstance(feature, dict)
            and isinstance(next(iter(feature.values())), dict)
        ]
        nested_text_features = [
            feature_name
            for feature_name in nested_features
            if any(
                _is_string_feature(nested_feature)
                for nested_feature in features[feature_name].values()
            )
        ]
        if not text_feature:
            return {
                subset_dropdown: gr.Dropdown(
                    value=subset, choices=subsets, visible=len(subsets) > 1
                ),
                split_dropdown: gr.Dropdown(
                    value=split, choices=splits, visible=len(splits) > 1
                ),
                text_column_dropdown: gr.Dropdown(
                    choices=text_features + nested_text_features,
                    label="Text column name",
                ),
                nested_text_column_dropdown: gr.Dropdown(visible=False),
            }
        if text_feature in nested_text_features:
            nested_keys = [
                feature_name
                for feature_name, feature in features[text_feature].items()
                if _is_string_feature(feature)
            ]
            return {
                subset_dropdown: gr.Dropdown(
                    value=subset, choices=subsets, visible=len(subsets) > 1
                ),
                split_dropdown: gr.Dropdown(
                    value=split, choices=splits, visible=len(splits) > 1
                ),
                text_column_dropdown: gr.Dropdown(
                    choices=text_features + nested_text_features,
                    label="Text column name",
                ),
                nested_text_column_dropdown: gr.Dropdown(
                    value=nested_keys[0],
                    choices=nested_keys,
                    label="Nested text column name",
                    visible=True,
                ),
            }
        return {
            subset_dropdown: gr.Dropdown(
                value=subset, choices=subsets, visible=len(subsets) > 1
            ),
            split_dropdown: gr.Dropdown(
                value=split, choices=splits, visible=len(splits) > 1
            ),
            text_column_dropdown: gr.Dropdown(
                choices=text_features + nested_text_features, label="Text column name"
            ),
            nested_text_column_dropdown: gr.Dropdown(visible=False),
        }

    @dataset_name.change(
        inputs=[dataset_name],
        outputs=[
            subset_dropdown,
            split_dropdown,
            text_column_dropdown,
            nested_text_column_dropdown,
        ],
    )
    def show_input_from_subset_dropdown(dataset: str) -> dict:
        return _resolve_dataset_selection(
            dataset, default_subset="default", default_split="train", text_feature=None
        )

    @subset_dropdown.change(
        inputs=[dataset_name, subset_dropdown],
        outputs=[
            subset_dropdown,
            split_dropdown,
            text_column_dropdown,
            nested_text_column_dropdown,
        ],
    )
    def show_input_from_subset_dropdown(dataset: str, subset: str) -> dict:
        return _resolve_dataset_selection(
            dataset, default_subset=subset, default_split="train", text_feature=None
        )

    @split_dropdown.change(
        inputs=[dataset_name, subset_dropdown, split_dropdown],
        outputs=[
            subset_dropdown,
            split_dropdown,
            text_column_dropdown,
            nested_text_column_dropdown,
        ],
    )
    def show_input_from_split_dropdown(dataset: str, subset: str, split: str) -> dict:
        return _resolve_dataset_selection(
            dataset, default_subset=subset, default_split=split, text_feature=None
        )

    @text_column_dropdown.change(
        inputs=[dataset_name, subset_dropdown, split_dropdown, text_column_dropdown],
        outputs=[
            subset_dropdown,
            split_dropdown,
            text_column_dropdown,
            nested_text_column_dropdown,
        ],
    )
    def show_input_from_text_column_dropdown(
        dataset: str, subset: str, split: str, text_column
    ) -> dict:
        return _resolve_dataset_selection(
            dataset,
            default_subset=subset,
            default_split=split,
            text_feature=text_column,
        )


demo.launch()