"""
Hold Slayer Gateway — Configuration

All settings loaded from environment variables / .env file.
"""

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class SIPTrunkSettings(BaseSettings):
    """SIP trunk provider configuration."""

    model_config = SettingsConfigDict(env_prefix="SIP_TRUNK_")

    host: str = "sip.provider.com"
    port: int = 5060
    username: str = ""
    password: str = ""
    transport: str = "udp"  # udp, tcp, tls
    did: str = ""  # Your phone number (E.164)


class GatewaySIPSettings(BaseSettings):
    """Gateway SIP listener for device registration."""

    model_config = SettingsConfigDict(env_prefix="GATEWAY_SIP_")

    host: str = "0.0.0.0"
    port: int = 5060
    domain: str = "gateway.local"


class SpeachesSettings(BaseSettings):
    """Speaches STT service configuration."""

    model_config = SettingsConfigDict(env_prefix="SPEACHES_")

    url: str = "http://localhost:22070"
    prod_url: str = "http://localhost:22070"
    model: str = "whisper-large-v3"


class ClassifierSettings(BaseSettings):
    """Audio classifier thresholds."""

    model_config = SettingsConfigDict(env_prefix="CLASSIFIER_")

    music_threshold: float = 0.7
    speech_threshold: float = 0.6
    silence_threshold: float = 0.85
    window_seconds: float = 3.0


class LLMSettings(BaseSettings):
    """LLM service configuration (OpenAI-compatible API)."""

    model_config = SettingsConfigDict(env_prefix="LLM_")

    base_url: str = "http://localhost:11434/v1"
    model: str = "llama3"
    api_key: str = "not-needed"
    timeout: float = 30.0
    max_tokens: int = 1024
    temperature: float = 0.3


class HoldSlayerSettings(BaseSettings):
    """Hold Slayer behavior settings."""

    model_config = SettingsConfigDict(env_prefix="HOLD_SLAYER_", env_prefix_allow_empty=True)

    default_transfer_device: str = Field(
        default="sip_phone", validation_alias="DEFAULT_TRANSFER_DEVICE"
    )
    max_hold_time: int = Field(default=7200, validation_alias="MAX_HOLD_TIME")
    hold_check_interval: float = Field(default=2.0, validation_alias="HOLD_CHECK_INTERVAL")


class Settings(BaseSettings):
    """Root application settings."""

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

    # Database
    database_url: str = "postgresql+asyncpg://holdslayer:changeme@localhost:5432/holdslayer"

    # Server
    host: str = "0.0.0.0"
    port: int = 8000
    debug: bool = True
    log_level: str = "info"

    # Notifications
    notify_sms_number: str = ""

    # Sub-configs
    sip_trunk: SIPTrunkSettings = Field(default_factory=SIPTrunkSettings)
    gateway_sip: GatewaySIPSettings = Field(default_factory=GatewaySIPSettings)
    speaches: SpeachesSettings = Field(default_factory=SpeachesSettings)
    classifier: ClassifierSettings = Field(default_factory=ClassifierSettings)
    llm: LLMSettings = Field(default_factory=LLMSettings)
    hold_slayer: HoldSlayerSettings = Field(default_factory=HoldSlayerSettings)


# Singleton
_settings: Settings | None = None


def get_settings() -> Settings:
    """Get cached application settings."""
    global _settings
    if _settings is None:
        _settings = Settings()
    return _settings