"""Email delivery tool — send files as attachments via Gmail SMTP."""

from __future__ import annotations

import logging
from pathlib import Path

from ..docx_export import text_to_docx
from ..email import EmailClient
from . import tool

log = logging.getLogger(__name__)


@tool(
    "email_file",
    description=(
        "Email a file as an attachment. If the file is .txt it is auto-converted "
        "to .docx before sending. Defaults to the configured recipient address."
    ),
    category="delivery",
)
def email_file(
    file_path: str,
    to: str = "",
    subject: str = "",
    ctx: dict | None = None,
) -> str:
    """Send a file by email, auto-converting .txt to .docx."""
    if not ctx or "config" not in ctx:
        return "Error: email tool requires agent context."

    email_cfg = ctx["config"].email
    if not email_cfg.enabled:
        return "Error: email not configured. Set GMAIL_USERNAME and GMAIL_APP_PASSWORD in .env."

    src = Path(file_path)
    if not src.exists():
        return f"Error: file not found: {file_path}"

    # Auto-convert .txt → .docx
    if src.suffix.lower() == ".txt":
        docx_path = src.with_suffix(".docx")
        text_to_docx(src.read_text(encoding="utf-8"), docx_path)
        attachment = docx_path
    else:
        attachment = src

    recipient = to or email_cfg.default_to
    if not recipient:
        return "Error: no recipient specified and EMAIL_DEFAULT_TO not set."

    mail_subject = subject or f"CheddahBot: {attachment.stem}"

    client = EmailClient(
        smtp_host=email_cfg.smtp_host,
        smtp_port=email_cfg.smtp_port,
        username=email_cfg.username,
        password=email_cfg.password,
    )

    try:
        client.send(
            to=recipient,
            subject=mail_subject,
            body=f"Attached: {attachment.name}",
            attachments=[attachment],
        )
    except Exception as e:
        log.error("Email send failed: %s", e)
        return f"Error sending email: {e}"

    return f"Sent {attachment.name} to {recipient}."