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_prefix="TUXDMX_", env_file=".env", extra="ignore")

    app_name: str = "TuxDMX"
    env: str = "development"
    secret_key: str = "development-secret-change-me"
    database_url: str = "sqlite+aiosqlite:///./data/tuxdmx.db"
    simulator_enabled: bool = True
    allow_local_docs: bool = True
    log_level: str = "INFO"
    target_fps: int = Field(default=30, ge=1, le=44)
    ola_universe: int = Field(default=1, ge=1, le=63999)
    ola_output_port: str | None = None
    ola_send_timeout_ms: int = Field(default=1000, ge=100, le=10000)
    system_control_enabled: bool = True
    system_service_name: str = "tuxdmx.service"
    system_control_helper: str = "/opt/tuxdmx/scripts/control-system.sh"
    frontend_dist: Path = Path("frontend/dist")
    data_dir: Path = Path("data")
    backup_dir: Path = Path("data/backups")
    fixture_cache_dir: Path = Path("data/fixtures")
    diagnostics_dir: Path = Path("data/diagnostics")
    uploads_dir: Path = Path("data/uploads")
    log_dir: Path = Path("data")


def resolve_path(path: Path) -> Path:
    return path.expanduser().resolve(strict=False)


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    settings = Settings()
    settings.frontend_dist = resolve_path(settings.frontend_dist)
    settings.data_dir = resolve_path(settings.data_dir)
    settings.backup_dir = resolve_path(settings.backup_dir)
    settings.fixture_cache_dir = resolve_path(settings.fixture_cache_dir)
    settings.diagnostics_dir = resolve_path(settings.diagnostics_dir)
    settings.uploads_dir = resolve_path(settings.uploads_dir)
    settings.log_dir = resolve_path(settings.log_dir)
    settings.data_dir.mkdir(parents=True, exist_ok=True)
    settings.backup_dir.mkdir(parents=True, exist_ok=True)
    settings.fixture_cache_dir.mkdir(parents=True, exist_ok=True)
    settings.diagnostics_dir.mkdir(parents=True, exist_ok=True)
    settings.uploads_dir.mkdir(parents=True, exist_ok=True)
    settings.log_dir.mkdir(parents=True, exist_ok=True)
    return settings


def get_alembic_database_url(database_url: str) -> str:
    if database_url.startswith("sqlite+aiosqlite:///"):
        return database_url.replace("sqlite+aiosqlite:///", "sqlite:///", 1)
    return database_url