from __future__ import annotations

import gzip
import re
from datetime import date, datetime
from pathlib import Path

from .config import TIMEZONE

UUID_RE = re.compile(r"[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}")


def as_int(value: object) -> int:
    if value is None:
        return 0
    if isinstance(value, bool):
        return int(value)
    if isinstance(value, (int, float)):
        return int(value)
    return 0


def as_float(value: object) -> float:
    if value is None:
        return 0.0
    if isinstance(value, bool):
        return float(value)
    if isinstance(value, (int, float)):
        return float(value)
    return 0.0


def today_in_tz() -> date:
    return datetime.now(TIMEZONE).date()


def now_in_tz() -> datetime:
    return datetime.now(TIMEZONE)


def sanitize_label(value: object, default: str = "unknown") -> str:
    if value is None:
        return default
    text = str(value).strip()
    return text or default


def prom_value(value: str) -> str:
    return value.replace("\\", r"\\").replace("\n", r"\n").replace('"', r'\"')


def metric_line(name: str, value: object, **labels: object) -> str:
    if labels:
        rendered = ",".join(f'{key}="{prom_value(sanitize_label(val))}"' for key, val in sorted(labels.items()))
        return f"{name}{{{rendered}}} {value}"
    return f"{name} {value}"


def open_session_file(path: Path):
    if path.suffix == ".gz":
        return gzip.open(path, "rt", encoding="utf-8")
    return path.open("r", encoding="utf-8")


def session_id_from_path(path: Path) -> str | None:
    match = UUID_RE.search(path.name)
    if match:
        return match.group(0).lower()
    return None