"""Configuration, paths, and constants for espmon."""

import os
import re
from pathlib import Path


# Paths
SCRIPT_DIR = Path(__file__).resolve().parent          # tools/espmon/
TOOLS_DIR = SCRIPT_DIR.parent                          # tools/
LOGS_DIR = TOOLS_DIR / "logs"
C3PO_DIR = TOOLS_DIR / "C3PO"
ENV_FILE = C3PO_DIR / ".env"
DEPLOY_JSON = TOOLS_DIR / "deploy.json"
PID_FILE = LOGS_DIR / ".espmon.pid"

# Serial
DEFAULT_BAUD = 115200

# API polling
POLL_INTERVAL = 0.5      # seconds between polls
POLL_TIMEOUT = 120        # max wait for command result

# ANSI escape codes
ANSI_RE = re.compile(r'\x1b\[[0-9;]*[a-zA-Z]|\x1b\(B')


def strip_ansi(text: str) -> str:
    """Remove ANSI escape codes from text."""
    return ANSI_RE.sub('', text)


class Config:
    """C3PO connection configuration.

    Reads from (in order of priority):
    1. Environment variables: ESPMON_HOST, ESPMON_PORT, ESPMON_TOKEN
    2. tools/C3PO/.env file
    3. Hardcoded defaults
    """

    def __init__(self):
        self.host = "localhost"
        self.port = 8000
        self.token = ""
        self._load()

    def _load(self):
        env_vars = {}
        if ENV_FILE.exists():
            with open(ENV_FILE) as f:
                for line in f:
                    line = line.strip()
                    if not line or line.startswith('#'):
                        continue
                    if '=' in line:
                        key, _, value = line.partition('=')
                        env_vars[key.strip()] = value.strip().strip('"').strip("'")

        # Host
        self.host = (
            os.environ.get("ESPMON_HOST")
            or env_vars.get("WEB_HOST", "").replace("0.0.0.0", "localhost")
            or "localhost"
        )

        # Port
        try:
            self.port = int(
                os.environ.get("ESPMON_PORT")
                or env_vars.get("WEB_PORT", "8000")
            )
        except ValueError:
            self.port = 8000

        # Auth token
        self.token = (
            os.environ.get("ESPMON_TOKEN")
            or env_vars.get("MULTILAT_AUTH_TOKEN", "")
        )

    @property
    def base_url(self) -> str:
        return f"http://{self.host}:{self.port}"