from __future__ import annotations

import base64
from pathlib import Path

import requests

from app.config import Config


class EmailConfigurationError(RuntimeError):
    pass


def send_pdf_report(
    config: Config,
    to_email: str,
    subject: str,
    body: str,
    pdf_path: Path,
) -> dict[str, object]:
    if not config.smtp2go_api_key:
        raise EmailConfigurationError("SMTP2GO_API_KEY is not configured.")
    if not config.report_sender_email:
        raise EmailConfigurationError("REPORT_SENDER_EMAIL is not configured.")

    sender = config.report_sender_email
    if config.report_sender_name:
        sender = f"{config.report_sender_name} <{config.report_sender_email}>"

    payload = {
        "api_key": config.smtp2go_api_key,
        "sender": sender,
        "to": [to_email],
        "subject": subject,
        "text_body": body,
        "attachments": [
            {
                "filename": pdf_path.name,
                "fileblob": base64.b64encode(pdf_path.read_bytes()).decode("ascii"),
                "mimetype": "application/pdf",
            }
        ],
    }
    response = requests.post(
        config.smtp2go_api_url,
        json=payload,
        timeout=config.smtp2go_timeout_seconds,
    )
    response.raise_for_status()
    data = response.json()
    if data.get("data", {}).get("succeeded") == 0:
        failures = data.get("data", {}).get("failures") or []
        raise RuntimeError(f"SMTP2GO did not send the report: {failures}")
    return data