import asyncio
import logging

import gradio as gr
import pandas as pd

from data_access import get_questions, get_source_finders, get_run_ids, get_baseline_rankers, \
    get_unified_sources, get_source_text, calculate_cumulative_statistics_for_all_questions, get_metadata, \
    get_async_connection

logger = logging.getLogger(__name__)

ALL_QUESTIONS_STR = "All questions"

# Initialize data at the module level
questions = []
source_finders = []
questions_dict = {}
source_finders_dict = {}
question_options = []
baseline_rankers_dict = {}
baseline_ranker_options = []
run_ids = []
available_run_id_dict = {}
finder_options = []
previous_run_id = "initial_run"
run_id_options = []

run_id_dropdown = None


# Get all questions

# Initialize data in a single async function
async def initialize_data():
    global source_finders, source_finders_dict, finder_options, baseline_rankers_dict, source_finders_dict, baseline_ranker_options
    async with get_async_connection() as conn:
        source_finders = await get_source_finders(conn)
        baseline_rankers = await get_baseline_rankers(conn)

    # Convert to dictionaries for easier lookup
    baseline_rankers_dict = {f["name"]: f["id"] for f in baseline_rankers}
    source_finders_dict = {f["name"]: f["id"] for f in source_finders}

    # Create formatted options for dropdowns
    finder_options = [s["name"] for s in source_finders]
    baseline_ranker_options = [b["name"] for b in baseline_rankers]


def update_run_ids(question_option, source_finder_name, baseline_ranker_name):
    return asyncio.run(update_run_ids_async(question_option, source_finder_name, baseline_ranker_name))


async def update_run_ids_async(question_option, source_finder_name, baseline_ranker_name):
    global question_options, questions_dict, previous_run_id, available_run_id_dict, run_id_options
    async with get_async_connection() as conn:
        finder_id_int = source_finders_dict.get(source_finder_name)
        available_run_id_dict = await get_run_ids(conn, finder_id_int)
        run_id_options = list(available_run_id_dict.keys())
        return gr.Dropdown(choices=[]), None, None, gr.Dropdown(choices=run_id_options,
                                                                value=None), "Select Question to see results.csv", ""


def update_questions_list(source_finder_name, run_id, baseline_ranker_name):
    return asyncio.run(update_questions_list_async(source_finder_name, run_id, baseline_ranker_name))


async def update_questions_list_async(source_finder_name, run_id, baseline_ranker_name):
    global available_run_id_dict
    if source_finder_name and run_id and baseline_ranker_name:
        async with get_async_connection() as conn:
            run_id_int = available_run_id_dict.get(run_id)
            baseline_ranker_id = baseline_rankers_dict.get(baseline_ranker_name)
            questions = await get_updated_question_list(conn, baseline_ranker_id, run_id_int)
            return gr.Dropdown(choices=questions, value=None), None, None, None, None
    else:
        return None, None, None, None, None


async def get_updated_question_list(conn, baseline_ranker_id, finder_id_int):
    global questions_dict, questions
    questions = await get_questions(conn, finder_id_int, baseline_ranker_id)
    if questions:
        questions_dict = {q["text"]: q["id"] for q in questions}
        question_options = [ALL_QUESTIONS_STR] + [q['text'] for q in questions]
    else:
        question_options = []
    return question_options


def update_sources_list(question_option, source_finder_id, run_id: str, baseline_ranker_id: str,
                        evt: gr.EventData = None):
    global previous_run_id
    if evt:
        logger.info(f"event: {evt.target.elem_id}")
        if evt.target.elem_id == "run_id_dropdown" and (type(run_id) == list or run_id == previous_run_id):
            return gr.skip(), gr.skip(), gr.skip(), gr.skip(), gr.skip()

    if type(run_id) == str:
        previous_run_id = run_id
    return asyncio.run(update_sources_list_async(question_option, source_finder_id, run_id, baseline_ranker_id))


# Main function to handle UI interactions
async def update_sources_list_async(question_option, source_finder_name, run_id, baseline_ranker_name: str):
    global available_run_id_dict, previous_run_id, questions_dict
    if not question_option:
        return gr.skip(), gr.skip(), "No question selected", ""
    if not source_finder_name or not run_id or not baseline_ranker_name:
        return gr.skip(), gr.skip(), "Need to select source finder and baseline", ""
    logger.info("processing update")
    async with get_async_connection() as conn:
        if type(baseline_ranker_name) == list:
            baseline_ranker_name = baseline_ranker_name[0]

        baseline_ranker_id_int = 1 if len(baseline_ranker_name) == 0 else baseline_rankers_dict.get(
            baseline_ranker_name)

        if len(source_finder_name):
            finder_id_int = source_finders_dict.get(source_finder_name)
        else:
            finder_id_int = None

        if question_option == ALL_QUESTIONS_STR:
            if finder_id_int:
                run_id_int = available_run_id_dict.get(run_id)
                all_stats = await calculate_cumulative_statistics_for_all_questions(conn, list(questions_dict.values()),
                                                                                    run_id_int,
                                                                                    baseline_ranker_id_int)
            else:
                all_stats = None
            return None, all_stats, "Select Run Id and source finder to see results.csv", ""

        # Extract question ID from selection
        question_id = questions_dict.get(question_option)

        available_run_id_dict = await get_run_ids(conn, finder_id_int, question_id)
        previous_run_id = run_id
        run_id_int = available_run_id_dict.get(run_id)

        source_runs = None
        stats = None
        # Get source runs data
        if finder_id_int:
            source_runs, stats = await get_unified_sources(conn, question_id, run_id_int, baseline_ranker_id_int)
            # Create DataFrame for display
            df = pd.DataFrame(source_runs)

        if not source_runs:
            return None, None, "No results.csv found for the selected filters",

        # Format table columns
        columns_to_display = ['sugya_id', 'in_baseline', 'baseline_rank', 'in_source_run', 'source_run_rank',
                              'tractate',
                              'folio', 'reason']
        df_display = df[columns_to_display] if all(col in df.columns for col in columns_to_display) else df

        # CSV for download
        # csv_data = df.to_csv(index=False)
        metadata = await get_metadata(conn, question_id, run_id_int)

    result_message = f"Found {len(source_runs)} results.csv"
    return df_display, stats, result_message, metadata


# Add a new function to handle row selection
async def handle_row_selection_async(evt: gr.SelectData):
    if evt is None or evt.value is None:
        return "No source selected"

    try:
        # Get the ID from the selected row
        tractate_chunk_id = evt.row_value[0]
        # Get the source text
        async with get_async_connection() as conn:
            text = await get_source_text(conn, tractate_chunk_id)
        return text
    except Exception as e:
        return f"Error retrieving source text: {str(e)}"


def handle_row_selection(evt: gr.SelectData):
    return asyncio.run(handle_row_selection_async(evt))


# Create Gradio app

# Ensure we clean up when done
async def main():
    global run_id_dropdown
    await initialize_data()
    with gr.Blocks(title="Source Runs Explorer", theme=gr.themes.Citrus()) as app:
        gr.Markdown("# Source Runs Explorer")

        with gr.Row():
            with gr.Column(scale=3):
                with gr.Row():
                    with gr.Column(scale=1):
                        source_finder_dropdown = gr.Dropdown(
                            choices=finder_options,
                            value=None,
                            label="Source Finder",
                            interactive=True,
                            elem_id="source_finder_dropdown"
                        )
                    with gr.Column(scale=1):
                        run_id_dropdown = gr.Dropdown(
                            choices=run_id_options,
                            value=None,
                            allow_custom_value=True,
                            label="source finder Run ID",
                            interactive=True,
                            elem_id="run_id_dropdown"
                        )
                    with gr.Column(scale=1):
                        baseline_rankers_dropdown = gr.Dropdown(
                            choices=baseline_ranker_options,
                            value=None,
                            label="Select Baseline Ranker",
                            interactive=True,
                            elem_id="baseline_rankers_dropdown"
                        )
                with gr.Row():
                    with gr.Column(scale=1):
                        # Main content area
                        question_dropdown = gr.Dropdown(
                            choices=[ALL_QUESTIONS_STR] + question_options,
                            label="Select Question (if list is empty this means there is no overlap between source run and baseline)",
                            value=None,
                            interactive=True,
                            elem_id="question_dropdown"
                        )

            with gr.Column(scale=1):
                # Sidebar area
                gr.Markdown("""To Get started select the following:                
                * Source Finder
                * Source Finder Run ID (corresponds to a run of the source finder for a group of questions)
                * Baseline Ranker (corresponds to a run of the baseline ranker for a group of questions)
                
                **Note: if there is no overlap between the baseline questions and the source finder questions, the question list will be empty.**
                """)

        with gr.Row():
            result_text = gr.Markdown("Select a question to view source runs")
        with gr.Row():
            gr.Markdown("# Source Run Statistics")
        with gr.Row():
            statistics_table = gr.DataFrame(
                headers=["num_high_ranked_baseline_sources",
                         "num_high_ranked_found_sources",
                         "overlap_count",
                         "overlap_percentage",
                         "high_ranked_overlap_count",
                         "high_ranked_overlap_percentage"
                         ],
                interactive=False,
            )
        with gr.Row():
            metadata_text = gr.TextArea(
                label="Metadata of Source Finder for Selected Question",
                elem_id="metadata",
                lines=2
            )
        with gr.Row():
            gr.Markdown("# Sources Found")
        with gr.Row():
            with gr.Column(scale=3):
                results_table = gr.DataFrame(
                    headers=['id', 'tractate', 'folio', 'in_baseline', 'baseline_rank', 'in_source_run',
                             'source_run_rank', 'source_reason', 'metadata'],
                    interactive=False
                )
            with gr.Column(scale=1):
                source_text = gr.TextArea(
                    value="Text of the source will appear here",
                    lines=15,
                    label="Source Text",
                    interactive=False,
                    elem_id="source_text"
                )

            # download_button = gr.DownloadButton(
            #     label="Download Results as CSV",
            #     interactive=True,
            #     visible=True
            # )

        # Set up event handlers
        results_table.select(
            handle_row_selection,
            inputs=None,
            outputs=source_text
        )

        baseline_rankers_dropdown.change(
            update_questions_list,
            inputs=[source_finder_dropdown, run_id_dropdown, baseline_rankers_dropdown],
            outputs=[question_dropdown, result_text, metadata_text]

        )

        run_id_dropdown.change(
            update_questions_list,
            inputs=[source_finder_dropdown, run_id_dropdown, baseline_rankers_dropdown],
            outputs=[question_dropdown, result_text, metadata_text, results_table, statistics_table]
        )

        question_dropdown.change(
            update_sources_list,
            inputs=[question_dropdown, source_finder_dropdown, run_id_dropdown, baseline_rankers_dropdown],
            outputs=[results_table, statistics_table, result_text, metadata_text]
        )

        source_finder_dropdown.change(
            update_run_ids,
            inputs=[question_dropdown, source_finder_dropdown, baseline_rankers_dropdown],
            # outputs=[run_id_dropdown, results_table, result_text, download_button]
            outputs=[question_dropdown, results_table, statistics_table, run_id_dropdown, result_text, metadata_text]
        )

    app.queue()
    app.launch()


if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO)
    asyncio.run(main())