import logging

import gradio as gr

from backend import get_backend
from ui_components import (
    build_data_info,
    build_multi_year_summary,
    build_prediction_summary,
    get_forecast_placeholder,
    get_prediction_placeholder,
)
from utils import setup_logging

setup_logging("INFO")
logger = logging.getLogger("GradioApp")


# Backend Interface
def get_data_info() -> str:
    backend = get_backend()
    data = backend.get_data_info()
    return build_data_info(data)


def generate_predictions(year: int, semester: int):
    backend = get_backend()
    result = backend.generate_predictions(year, semester)

    if result.error:
        return f"Error: {result.error}", None, None

    summary_html = build_prediction_summary(result.summary_data)
    return summary_html, result.predictions_df, result.comparison_df


def generate_multi_year_forecast(year: int, semester: int, years_ahead: int = 3):
    backend = get_backend()
    result = backend.generate_multi_year_forecast(year, semester, years_ahead)

    if result.error:
        return f"Error: {result.error}", None

    summary_html = build_multi_year_summary(result.summary_data)
    return summary_html, result.forecast_df


def update_ui_with_predictions(year: int, semester: int):
    summary, all_predictions, comparison = generate_predictions(year, semester)

    logger.info(
        f"UI Update: comparison is None: {comparison is None}, "
        f"empty: {comparison.empty if comparison is not None else 'N/A'}"
    )

    if comparison is not None and not comparison.empty:
        logger.info(f"Showing comparison table with {len(comparison)} rows")
        return (
            summary,
            all_predictions,
            gr.update(open=True),
            gr.update(
                value=f"Validasi terhadap {len(comparison)} mata kuliah - "
                "termasuk perbandingan jumlah kelas aktual vs prediksi"
            ),
            gr.update(value=comparison),
        )
    else:
        logger.info("Hiding comparison table - no data available")
        return (
            summary,
            all_predictions,
            gr.update(open=False),
            gr.update(value="Tidak ada data validasi untuk prediksi masa depan"),
            gr.update(value=None),
        )


# Gradio UI
def create_gradio_app() -> gr.Blocks:
    """Create and configure the Gradio application."""

    with gr.Blocks(title="SKS Enrollment Predictor") as demo:
        # Header
        gr.Markdown("# Course Enrollment & Class Capacity Predictor")
        gr.Markdown(
            "Sistem prediksi **jumlah kelas yang perlu dibuka** berdasarkan "
            "forecasting enrollment dengan mempertimbangkan kapasitas maksimum per kelas."
        )

        with gr.Tabs():
            # Single Year
            with gr.TabItem("Prediksi Semester"):
                with gr.Row():
                    with gr.Column(scale=1, min_width=300):
                        year_input = gr.Number(
                            label="Tahun",
                            value=2025,
                            precision=0,
                            minimum=2020,
                            maximum=2030,
                        )

                        semester_input = gr.Radio(
                            choices=[("1 (Ganjil)", 1), ("2 (Genap)", 2)],
                            label="Semester",
                            value=2,
                        )

                        predict_btn = gr.Button(
                            "Generate Predictions",
                            variant="primary",
                            size="lg",
                        )

                        gr.Markdown("---")

                        with gr.Accordion("Dataset Info", open=False):
                            data_info_output = gr.HTML()
                            demo.load(
                                fn=get_data_info, inputs=[], outputs=data_info_output
                            )

                    with gr.Column(scale=3):
                        summary_output = gr.HTML(value=get_prediction_placeholder())

                gr.Markdown("---")

                gr.Markdown("### Rekomendasi Jumlah Kelas per Mata Kuliah")
                gr.Markdown(
                    "*Jumlah kelas dihitung berdasarkan prediksi enrollment ÷ "
                    "kapasitas per kelas*"
                )
                all_predictions_output = gr.Dataframe(
                    label="",
                    wrap=True,
                    interactive=False,
                )

                with gr.Accordion(
                    "Detail Validasi", open=False
                ) as comparison_accordion:
                    comparison_info = gr.Markdown(
                        value="Data validasi muncul ketika data aktual tersedia"
                    )
                    comparison_output = gr.Dataframe(
                        label="",
                        wrap=True,
                        interactive=False,
                    )

            # Multi-Year Forecast
            with gr.TabItem("Proyeksi Multi-Tahun"):
                gr.Markdown("### Forecasting Kebutuhan Kelas Beberapa Tahun ke Depan")
                gr.Markdown(
                    "Memprediksi tren jumlah mahasiswa dan kebutuhan kelas "
                    "untuk perencanaan jangka panjang."
                )

                with gr.Row():
                    with gr.Column(scale=1):
                        forecast_year = gr.Number(
                            label="Tahun Mulai",
                            value=2025,
                            precision=0,
                            minimum=2020,
                            maximum=2030,
                        )

                        forecast_semester = gr.Radio(
                            choices=[("1 (Ganjil)", 1), ("2 (Genap)", 2)],
                            label="Semester",
                            value=2,
                        )

                        forecast_years = gr.Slider(
                            label="Tahun ke Depan",
                            minimum=1,
                            maximum=5,
                            value=3,
                            step=1,
                        )

                        forecast_btn = gr.Button(
                            "Generate Forecast",
                            variant="primary",
                            size="lg",
                        )

                    with gr.Column(scale=3):
                        forecast_summary = gr.HTML(value=get_forecast_placeholder())

                gr.Markdown("---")
                gr.Markdown("### Detail Proyeksi per Mata Kuliah per Tahun")
                forecast_table = gr.Dataframe(
                    label="",
                    wrap=True,
                    interactive=False,
                )

        predict_btn.click(
            fn=update_ui_with_predictions,
            inputs=[year_input, semester_input],
            outputs=[
                summary_output,
                all_predictions_output,
                comparison_accordion,
                comparison_info,
                comparison_output,
            ],
        )

        forecast_btn.click(
            fn=generate_multi_year_forecast,
            inputs=[forecast_year, forecast_semester, forecast_years],
            outputs=[forecast_summary, forecast_table],
        )

    return demo


logger.info("Starting Gradio app...")
backend = get_backend()
init_success = backend.initialize()

if not init_success:
    logger.error("Failed to initialize system. App may not work correctly.")

demo = create_gradio_app()

# Launch the app
if __name__ == "__main__":
    demo.launch(
        server_name="0.0.0.0",
        server_port=7860,
        share=False,
        show_error=True,
    )