import os
import pandas as pd
import plotly.graph_objects as go
from flask import url_for
from abc import ABC, abstractmethod

from .base import BaseAnalysis
from app.analysis.data_utils import prepare_data, mk_plotdir

# -------------------------------------------
# Base Class for All Plotly Plot Analyses
# -------------------------------------------
class BasePlotlyAnalysis(BaseAnalysis, ABC):
    """
    Base class for all Plotly plot-based analyses.
    It enforces a structure for:
    - Data preparation
    - Transformation
    - Plot generation
    - Memory cleanup
    """
    
    plot_filename = "default_plot.html"
    alt_text = "Default Alt Text"

    def execute(self, df: pd.DataFrame):
        """Executes the full analysis pipeline"""
        df = prepare_data(df)  # Step 1: Prepare data

        paths = mk_plotdir(self.plot_filename)
        self.output_path, self.plot_url = paths['output_path'], paths['plot_url']

        df = self.transform_data(df)  # Step 2: Transform data (implemented by subclass)
        self.plot_data(df)  # Step 3: Create the plot

        # Save the plot as an HTML file
        self.fig.write_html(self.output_path)

        del df  # Step 4: Free memory
        return f'<iframe src="{self.plot_url}" width="100%" height="600"></iframe>'

    @abstractmethod
    def transform_data(self, df: pd.DataFrame) -> pd.DataFrame:
        """Subclasses must define how they transform the data"""
        pass

    @abstractmethod
    def plot_data(self, df: pd.DataFrame):
        """Subclasses must define how they generate the plot"""
        pass