"""
L1 Server Configuration.

Environment-based configuration with sensible defaults.
"""

import os
from pathlib import Path
from dataclasses import dataclass, field
from typing import Optional


@dataclass
class Settings:
    """Application settings loaded from environment."""

    # Server
    host: str = field(default_factory=lambda: os.environ.get("HOST", "0.0.0.0"))
    port: int = field(default_factory=lambda: int(os.environ.get("PORT", "8000")))
    debug: bool = field(default_factory=lambda: os.environ.get("DEBUG", "").lower() == "true")

    # Cache (use /data/cache in Docker via env var, ~/.artdag/cache locally)
    cache_dir: Path = field(
        default_factory=lambda: Path(os.environ.get("CACHE_DIR", str(Path.home() / ".artdag" / "cache")))
    )

    # Redis
    redis_url: str = field(
        default_factory=lambda: os.environ.get("REDIS_URL", "redis://localhost:6379/5")
    )

    # Database
    database_url: str = field(
        default_factory=lambda: os.environ.get(
            "DATABASE_URL", "postgresql://artdag:artdag@localhost:5432/artdag"
        )
    )

    # IPFS
    ipfs_api: str = field(
        default_factory=lambda: os.environ.get("IPFS_API", "/dns/localhost/tcp/5001")
    )
    ipfs_gateway_url: str = field(
        default_factory=lambda: os.environ.get("IPFS_GATEWAY_URL", "https://ipfs.io/ipfs")
    )

    # L2 Server
    l2_server: Optional[str] = field(
        default_factory=lambda: os.environ.get("L2_SERVER")
    )
    l2_domain: Optional[str] = field(
        default_factory=lambda: os.environ.get("L2_DOMAIN")
    )

    # Derived paths
    @property
    def plan_cache_dir(self) -> Path:
        return self.cache_dir / "plans"

    @property
    def analysis_cache_dir(self) -> Path:
        return self.cache_dir / "analysis"

    def ensure_dirs(self) -> None:
        """Create required directories."""
        self.cache_dir.mkdir(parents=True, exist_ok=True)
        self.plan_cache_dir.mkdir(parents=True, exist_ok=True)
        self.analysis_cache_dir.mkdir(parents=True, exist_ok=True)


# Singleton settings instance
settings = Settings()