from __future__ import annotations

from functools import lru_cache
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


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

    # App
    debug: bool = Field(default=True, alias="DEBUG")
    cors_allowed_origins: list[str] = Field(
        default_factory=lambda: ["http://localhost:3000", "http://localhost:8000"],
        alias="CORS_ALLOWED_ORIGINS",
    )

    # JWT
    jwt_secret_key: str = Field(default="dev-secret", alias="JWT_SECRET_KEY")
    jwt_algorithm: str = Field(default="HS256", alias="JWT_ALGORITHM")
    jwt_access_ttl_minutes: int = Field(default=60, alias="JWT_ACCESS_TTL_MINUTES")
    jwt_refresh_ttl_days: int = Field(default=30, alias="JWT_REFRESH_TTL_DAYS")

    # DB
    postgres_user: str = Field(default="postgres", alias="POSTGRES_USER")
    postgres_password: str = Field(default="postgres", alias="POSTGRES_PASSWORD")
    postgres_host: str = Field(default="localhost", alias="POSTGRES_HOST")
    postgres_port: int = Field(default=5332, alias="POSTGRES_PORT")
    postgres_database: str = Field(
        default="coffee_project_db", alias="POSTGRES_DATABASE"
    )

    database_url: str | None = Field(default=None, alias="DATABASE_URL")

    # Storage
    storage_backend: str = Field(default="S3", alias="STORAGE_BACKEND")

    s3_access_key: str | None = Field(default=None, alias="S3_ACCESS_KEY")
    s3_secret_key: str | None = Field(default=None, alias="S3_SECRET_KEY")
    s3_bucket_name: str = Field(default="coffee-bucket", alias="S3_BUCKET_NAME")

    # Internal endpoint is used by the API container to talk to MinIO/S3.
    s3_endpoint_url_internal: str | None = Field(
        default=None, alias="S3_ENDPOINT_URL_INTERNAL"
    )
    # Public endpoint is only used to generate browser-accessible URLs.
    s3_endpoint_url_public: str | None = Field(
        default=None, alias="S3_ENDPOINT_URL_PUBLIC"
    )

    s3_presign_expires_seconds: int = Field(default=3600, alias="S3_PRESIGN_EXPIRES")

    local_storage_dir: Path = Field(
        default=Path("./.local_storage"), alias="LOCAL_STORAGE_DIR"
    )

    # External services
    remotion_service_url: str = Field(
        default="http://localhost:8001", alias="REMOTION_SERVICE_URL"
    )

    transcription_models_dir: Path = Field(
        default=Path("./.artifacts/Models/transcription"),
        alias="TRANSCRIPTION_MODELS_DIR",
    )

    google_service_key_path: Path = Field(
        default=Path("./.s_data/keyapispeech.json"),
        alias="GOOGLE_APPLICATION_CREDENTIALS",
    )

    def get_database_url(self) -> str:
        if self.database_url:
            return self.database_url
        return (
            f"postgresql+asyncpg://{self.postgres_user}:{self.postgres_password}"
            f"@{self.postgres_host}:{self.postgres_port}/{self.postgres_database}"
        )


@lru_cache
def get_settings() -> Settings:
    return Settings()