# space/tools/report_tool.py
import os
from typing import Optional, Dict, Any

import pandas as pd
from jinja2 import Environment, FileSystemLoader

from utils.tracing import Tracer
from utils.config import AppConfig


class ReportTool:
    def __init__(self, cfg: AppConfig, tracer: Tracer):
        self.cfg = cfg
        self.tracer = tracer

        # Resolve the /space/templates directory reliably whether run as script or module
        templates_dir = os.path.abspath(
            os.path.join(os.path.dirname(__file__), "..", "templates")
        )
        self.env = Environment(loader=FileSystemLoader(templates_dir), autoescape=False)
        self.templates_dir = templates_dir  # keep for any future file refs

    def render_and_save(
        self,
        user_query: str,
        sql_preview: Optional[pd.DataFrame],
        predict_preview: Optional[pd.DataFrame],
        explain_images: Dict[str, str],
        plan: Dict[str, Any],
    ) -> str:
        """
        Render a simple HTML report from the Markdown-like template, then save it next to app.py.
        Returns the relative path to the generated HTML file.
        """
        tmpl = self.env.get_template("report_template.md")

        html_body = tmpl.render(
            user_query=user_query,
            plan=plan,
            sql_preview=sql_preview.to_markdown(index=False) if isinstance(sql_preview, pd.DataFrame) else "",
            predict_preview=predict_preview.to_markdown(index=False) if isinstance(predict_preview, pd.DataFrame) else "",
            explain_images=explain_images or {},
        )

        # Name the output in the working dir (HF Spaces serves from cwd)
        out_name = f"report_{pd.Timestamp.utcnow().strftime('%Y%m%d_%H%M%S')}.html"
        out_path = os.path.abspath(os.path.join(os.getcwd(), out_name))

        # Link stylesheet relative to the app working dir (matches scaffold layout)
        css_link = "templates/report_styles.css"
        html = f'<link rel="stylesheet" href="{css_link}">\n' + html_body

        with open(out_path, "w", encoding="utf-8") as f:
            f.write(html)

        # trace
        try:
            self.tracer.trace_event("report", {"path": out_name})
        except Exception:
            pass

        # Return a relative path so Gradio can offer it as a download if needed
        return out_name