"""Application configuration via pydantic-settings."""

from typing import Literal

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings loaded from environment variables."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
    )

    # Database
    database_url: str

    # Redis (legacy default for Celery broker)
    redis_url: str = "redis://localhost:6379/0"

    # Task queue
    task_queue_driver: Literal["celery", "inmemory"] = "celery"
    task_queue_broker_url: str | None = None
    task_queue_backend: Literal["redis", "sqs"] = "redis"
    task_queue_default_queue: str = "default"
    task_queue_critical_queue: str = "critical"
    task_queue_visibility_timeout: int = 600
    task_queue_polling_interval: float = 1.0
    notification_escalation_delay_seconds: int = 900

    # AWS (used when task_queue_backend="sqs")
    aws_region: str | None = None

    # JWT
    jwt_secret_key: str
    jwt_algorithm: str = "HS256"
    jwt_issuer: str = "incidentops"
    jwt_audience: str = "incidentops-api"
    access_token_expire_minutes: int = 15
    refresh_token_expire_days: int = 30

    # Application
    debug: bool = False
    api_v1_prefix: str = "/v1"

    # OpenTelemetry
    otel_enabled: bool = True
    otel_service_name: str = "incidentops-api"
    otel_environment: str = "development"
    otel_exporter_otlp_endpoint: str | None = None  # e.g., "http://tempo:4317"
    otel_exporter_otlp_insecure: bool = True
    otel_log_level: str = "INFO"

    # Metrics
    prometheus_port: int = 9464  # Port for Prometheus metrics endpoint

    @property
    def resolved_task_queue_broker_url(self) -> str:
        """Return the broker URL with redis fallback for backwards compatibility."""

        return self.task_queue_broker_url or self.redis_url


settings = Settings()  # type: ignore[call-arg]