import gradio as gr
import numpy as np
import os
import pandas as pd
import pysr
import tempfile
from typing import Optional

empty_df = pd.DataFrame(
    {
        "equation": [],
        "loss": [],
        "complexity": [],
    }
)


def greet(
    file_obj: Optional[tempfile._TemporaryFileWrapper],
    col_to_fit: str,
    niterations: int,
    maxsize: int,
    binary_operators: list,
    unary_operators: list,
    force_run: bool,
):
    if col_to_fit == "":
        return (
            empty_df,
            "Please enter a column to predict!",
        )
    if len(binary_operators) == 0 and len(unary_operators) == 0:
        return (
            empty_df,
            "Please select at least one operator!",
        )
    if file_obj is None:
        return (
            empty_df,
            "Please upload a CSV file!",
        )
    # Look at some statistics of the file:
    df = pd.read_csv(file_obj.name)
    if len(df) == 0:
        return (
            empty_df,
            "The file is empty!",
        )
    if len(df.columns) == 1:
        return (
            empty_df,
            "The file has only one column!",
        )
    if col_to_fit not in df.columns:
        return (
            empty_df,
            f"The column to predict, {col_to_fit}, is not in the file!"
            f"I found {df.columns}.",
        )
    if len(df) > 10_000 and not force_run:
        return (
            empty_df,
            "You have uploaded a file with more than 10,000 rows. "
            "This will take very long to run. "
            "Please upload a subsample of the data, "
            "or check the box 'Ignore Warnings'.",
        )

    binary_operators = str(binary_operators).replace("'", '"')
    unary_operators = str(unary_operators).replace("'", '"')

    df = pd.read_csv(file_obj)
    y = np.array(df[col_to_fit])
    X = df.drop([col_to_fit], axis=1)

    model = pysr.PySRRegressor(
        progress=False,
        bumper=True,
        maxsize=maxsize,
        niterations=niterations,
        binary_operators=binary_operators,
        unary_operators=unary_operators,
    )
    model.fit(X, y)

    df = model.equations_[["equation", "loss", "complexity"]]
    # Convert all columns to string type:
    df = df.astype(str)
    msg = (
            "Success!\n"
            f"You may run the model locally (faster) with "
            f"the following parameters:"
            +f"""
model = PySRRegressor(
    niterations={niterations},
    binary_operators={str(binary_operators)},
    unary_operators={str(unary_operators)},
    maxsize={maxsize},
)
model.fit(X, y)""")

    df.to_csv("pysr_output.csv", index=False)
    return df, msg

def main():
    demo = gr.Interface(
        fn=greet,
        description="Symbolic Regression with PySR. Watch search progress by clicking 'See logs'!",
        inputs=[
            gr.File(label="Upload a CSV File"),
            gr.Textbox(label="Column to Predict", placeholder="y"),
            gr.Slider(
                minimum=1,
                maximum=1000,
                value=40,
                label="Number of Iterations",
                step=1,
            ),
            gr.Slider(
                minimum=7,
                maximum=35,
                value=20,
                label="Maximum Complexity",
                step=1,
            ),
            gr.CheckboxGroup(
                choices=["+", "-", "*", "/", "^"],
                label="Binary Operators",
                value=["+", "-", "*", "/"],
            ),
            gr.CheckboxGroup(
                choices=[
                    "sin",
                    "cos",
                    "exp",
                    "log",
                    "square",
                    "cube",
                    "sqrt",
                    "abs",
                    "tan",
                ],
                label="Unary Operators",
                value=[],
            ),
            gr.Checkbox(
                value=False,
                label="Ignore Warnings",
            ),
        ],
        outputs=[
            "dataframe",
            gr.Textbox(label="Error Log"),
        ],
    )
    # Add file to the demo:

    demo.launch()


if __name__ == "__main__":
    main()