"""File logging for WESP admin server-log viewer (SERVER_LOG_PATH)."""

from __future__ import annotations

import logging
from datetime import UTC, datetime
from pathlib import Path
from typing import Any

from app.core.config import settings

_LOG_FORMAT = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"


def server_log_path() -> Path:
    return Path(settings.server_log_path)


def ensure_server_log_file() -> Path:
    path = server_log_path()
    path.parent.mkdir(parents=True, exist_ok=True)
    if not path.is_file():
        started = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%SZ")
        path.write_text(f"{started} [INFO] compton.api: server log initialized\n", encoding="utf-8")
    return path.resolve()


def build_uvicorn_log_config() -> dict[str, Any]:
    log_path = str(ensure_server_log_file())
    return {
        "version": 1,
        "disable_existing_loggers": False,
        "formatters": {
            "default": {
                "format": _LOG_FORMAT,
            },
        },
        "handlers": {
            "file": {
                "class": "logging.FileHandler",
                "filename": log_path,
                "encoding": "utf-8",
                "formatter": "default",
            },
            "console": {
                "class": "logging.StreamHandler",
                "formatter": "default",
            },
        },
        "loggers": {
            "uvicorn": {"handlers": ["file", "console"], "level": settings.log_level, "propagate": False},
            "uvicorn.error": {"handlers": ["file", "console"], "level": settings.log_level, "propagate": False},
            "uvicorn.access": {"handlers": ["file", "console"], "level": "INFO", "propagate": False},
        },
        "root": {"handlers": ["file", "console"], "level": settings.log_level},
    }


def append_server_log_line(message: str, level: str = "INFO") -> None:
    path = ensure_server_log_file()
    ts = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%SZ")
    with path.open("a", encoding="utf-8") as fh:
        fh.write(f"{ts} [{level}] compton.api: {message}\n")