from functools import lru_cache
from typing import Literal

from pydantic import field_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=".env", env_file_encoding="utf-8", extra="ignore"
    )

    host: str = "0.0.0.0"
    port: int = 7860
    model_dir: str = "/app/models/supertonic-2"
    kitten_model_name: str = "KittenML/kitten-tts-micro-0.8"
    kitten_cache_dir: str = "/app/models/hf-cache"
    enable_melo_tts: bool = False
    melo_device: Literal["cpu"] = "cpu"
    melo_fail_fast: bool = True
    custom_voice_dir: str = "/app/voices"
    kokoro_model_dir: str = "/app/models/kokoro"
    kokoro_model_file: str = "model_q8f16.onnx"
    default_model: str = "supertonic-2"
    default_voice: str = "alloy"
    default_response_format: Literal["wav"] = "wav"
    default_speed: float = 1.05
    default_quality: Literal["low", "balanced", "high"] = "balanced"
    default_language: Literal["en", "ko", "es", "pt", "fr"] = "en"
    require_auth: bool = False
    api_key: str = ""
    log_level: str = "info"
    omp_num_threads: int = 1
    ort_intra_op_num_threads: int = 1
    ort_inter_op_num_threads: int = 1
    max_input_length: int = 5000
    job_poll_interval: float = 2.0
    workspace_dir: str = "/tmp/tts-server"
    persistent_output_dir: str = "/store"

    @field_validator("default_speed")
    @classmethod
    def validate_default_speed(cls, value: float) -> float:
        if not 0.25 <= value <= 4.0:
            raise ValueError("default_speed must be between 0.25 and 4.0")
        return value


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()