"""
Shared utilities for the Email Triage environment.

Provides logging configuration, constants, and helper functions used
across multiple modules.
"""

from __future__ import annotations

import logging
import re
from typing import Optional, Tuple

from src.models import Action

# ── Logging ──────────────────────────────────────────────────────────────────

LOG_FORMAT = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"
LOG_DATE_FORMAT = "%Y-%m-%d %H:%M:%S"


def setup_logging(level: int = logging.INFO) -> None:
    """Configure root logger with consistent format."""
    logging.basicConfig(
        level=level,
        format=LOG_FORMAT,
        datefmt=LOG_DATE_FORMAT,
    )


# ── Action Parsing ───────────────────────────────────────────────────────────

_MOVE_PATTERN = re.compile(
    r"move\s*\(\s*(\d+)\s*,\s*(['\"]?)(\w+)\2\s*\)", re.IGNORECASE
)
_FLAG_PATTERN = re.compile(r"flag\s*\(\s*(\d+)\s*\)", re.IGNORECASE)
_DELETE_PATTERN = re.compile(r"delete\s*\(\s*(\d+)\s*\)", re.IGNORECASE)
_SPAM_PATTERN = re.compile(r"mark_spam\s*\(\s*(\d+)\s*\)", re.IGNORECASE)
_SNOOZE_PATTERN = re.compile(r"snooze\s*\(\s*(\d+)\s*\)", re.IGNORECASE)


def parse_action_string(action_str: str) -> Optional[Action]:
    """Parse a text action like ``move(3, finance)`` into an Action model.

    Supports formats:
      - move(id, folder)
      - flag(id)
      - delete(id)
      - mark_spam(id)
      - snooze(id)

    Args:
        action_str: Raw text from the LLM.

    Returns:
        An Action instance, or None if parsing fails.
    """
    action_str = action_str.strip()

    m = _MOVE_PATTERN.search(action_str)
    if m:
        return Action(
            action_type="move",
            email_id=int(m.group(1)),
            target_folder=m.group(3).lower(),
        )

    m = _FLAG_PATTERN.search(action_str)
    if m:
        return Action(action_type="flag", email_id=int(m.group(1)))

    m = _DELETE_PATTERN.search(action_str)
    if m:
        return Action(action_type="delete", email_id=int(m.group(1)))

    m = _SPAM_PATTERN.search(action_str)
    if m:
        return Action(action_type="mark_spam", email_id=int(m.group(1)))

    m = _SNOOZE_PATTERN.search(action_str)
    if m:
        return Action(action_type="snooze", email_id=int(m.group(1)))

    return None


def format_action_for_log(action: Action) -> str:
    """Format an action into a compact log string."""
    if action.action_type == "move":
        return f"move({action.email_id}, {action.target_folder})"
    return f"{action.action_type}({action.email_id})"