from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


def _load_dotenv() -> None:
    here = Path(__file__).resolve()
    module_dir = here.parent

    candidates: list[Path] = [module_dir / ".env"]

    # Optional project-root fallback when running from full repository layout.
    if len(here.parents) > 2:
        candidates.append(here.parents[2] / ".env")

    for env_path in candidates:
        if not env_path.exists():
            continue

        for raw_line in env_path.read_text(encoding="utf-8").splitlines():
            line = raw_line.strip()
            if not line or line.startswith("#") or "=" not in line:
                continue

            key, value = line.split("=", 1)
            key = key.strip()
            value = value.strip().strip('"').strip("'")
            if key and key not in os.environ:
                os.environ[key] = value

        break


_load_dotenv()


def _env_bool(name: str, default: bool) -> bool:
    raw = os.environ.get(name)
    if raw is None:
        return default
    return raw.strip().lower() in {"1", "true", "yes", "on"}


@dataclass
class VoiceRuntimeConfig:
    groq_api_key: str = os.environ.get("GROQ_API_KEY", "")
    groq_model_id: str = os.environ.get("GROQ_MODEL_ID", "whisper-large-v3-turbo")
    sample_rate: int = int(os.environ.get("VOICE_SAMPLE_RATE", "16000"))

    silence_threshold_db: float = float(os.environ.get("VOICE_SILENCE_THRESHOLD_DB", "-40"))
    min_silence_sec: float = float(os.environ.get("VOICE_MIN_SILENCE_SEC", "0.30"))
    keep_padding_sec: float = float(os.environ.get("VOICE_KEEP_PADDING_SEC", "0.05"))
    analysis_window_ms: int = int(os.environ.get("VOICE_ANALYSIS_WINDOW_MS", "10"))

    diarization_enabled: bool = _env_bool("VOICE_DIARIZATION_ENABLED", True)
    diarization_model_id: str = os.environ.get("VOICE_DIARIZATION_MODEL_ID", "pyannote/speaker-diarization-3.1")
    hf_token: str = os.environ.get("HF_TOKEN", "")
    diarization_min_speakers: int = int(os.environ.get("VOICE_DIARIZATION_MIN_SPEAKERS", "0"))
    diarization_max_speakers: int = int(os.environ.get("VOICE_DIARIZATION_MAX_SPEAKERS", "0"))

    @classmethod
    def from_env(cls) -> "VoiceRuntimeConfig":
        return cls()