from __future__ import annotations

import os
import shlex
from pathlib import Path

from pydantic import BaseModel, Field


class Settings(BaseModel):
    sab_url: str = "http://sabnzbd:8080"
    sab_api_key: str | None = None
    sab_category: str = "manual"
    sab_storage_root: Path | None = None
    download_root: Path = Path("/data/downloads/manual")
    movies_root: Path = Path("/data/movies")
    tv_root: Path = Path("/data/tv")
    state_path: Path = Path("/config/importarr.db")
    log_level: str = "info"
    radarr_url: str | None = None
    radarr_api_key: str | None = None
    sonarr_url: str | None = None
    sonarr_api_key: str | None = None
    auth_token: str | None = None
    restart_command: list[str] = Field(default_factory=lambda: ["systemctl", "restart", "importarr.service"])
    update_command: list[str] = Field(default_factory=lambda: ["sh", "deploy/repo-upgrade.sh"])
    update_release_url: str = "https://gitea.delphas.dk/api/v1/repos/daniels/importarr/releases/latest"
    update_check_timeout_seconds: int = Field(default=15, ge=1)
    control_command_timeout_seconds: int = Field(default=120, ge=1)
    bind_host: str = "127.0.0.1"
    bind_port: int = 8765
    poll_seconds: int = Field(default=60, ge=5)

    @classmethod
    def from_env(cls) -> "Settings":
        return cls(
            sab_url=os.getenv("IMPORTARR_SAB_URL", cls.model_fields["sab_url"].default),
            sab_api_key=_env_secret("IMPORTARR_SAB_API_KEY"),
            sab_category=os.getenv("IMPORTARR_SAB_CATEGORY", "manual"),
            sab_storage_root=Path(os.getenv("IMPORTARR_SAB_STORAGE_ROOT")) if os.getenv("IMPORTARR_SAB_STORAGE_ROOT") else None,
            download_root=Path(os.getenv("IMPORTARR_DOWNLOAD_ROOT", "/data/downloads/manual")),
            movies_root=Path(os.getenv("IMPORTARR_MOVIES_ROOT", "/data/movies")),
            tv_root=Path(os.getenv("IMPORTARR_TV_ROOT", "/data/tv")),
            state_path=Path(os.getenv("IMPORTARR_STATE_PATH", "/config/importarr.db")),
            log_level=os.getenv("IMPORTARR_LOG_LEVEL", "info"),
            radarr_url=os.getenv("IMPORTARR_RADARR_URL"),
            radarr_api_key=_env_secret("IMPORTARR_RADARR_API_KEY"),
            sonarr_url=os.getenv("IMPORTARR_SONARR_URL"),
            sonarr_api_key=_env_secret("IMPORTARR_SONARR_API_KEY"),
            auth_token=_env_secret("IMPORTARR_AUTH_TOKEN"),
            restart_command=_env_command("IMPORTARR_RESTART_COMMAND", ["systemctl", "restart", "importarr.service"]),
            update_command=_env_command("IMPORTARR_UPDATE_COMMAND", ["sh", "deploy/repo-upgrade.sh"]),
            update_release_url=os.getenv("IMPORTARR_UPDATE_RELEASE_URL", "https://gitea.delphas.dk/api/v1/repos/daniels/importarr/releases/latest"),
            update_check_timeout_seconds=int(os.getenv("IMPORTARR_UPDATE_CHECK_TIMEOUT_SECONDS", "15")),
            control_command_timeout_seconds=int(os.getenv("IMPORTARR_CONTROL_COMMAND_TIMEOUT_SECONDS", "120")),
            bind_host=os.getenv("IMPORTARR_BIND_HOST", "127.0.0.1"),
            bind_port=int(os.getenv("IMPORTARR_BIND_PORT", "8765")),
            poll_seconds=int(os.getenv("IMPORTARR_POLL_SECONDS", "60")),
        )

    def resolve_under_download_root(self, user_path: str) -> Path:
        root = self.download_root.resolve()
        candidate = Path(user_path)
        if not candidate.is_absolute():
            candidate = root / candidate
        resolved = candidate.resolve()
        if resolved != root and root not in resolved.parents:
            raise ValueError("path must resolve under IMPORTARR_DOWNLOAD_ROOT")
        return resolved


def _env_secret(name: str) -> str | None:
    file_value = os.getenv(f"{name}_FILE")
    if file_value:
        return Path(file_value).read_text(encoding="utf-8").strip()
    return os.getenv(name)


def _env_command(name: str, default: list[str]) -> list[str]:
    value = os.getenv(name)
    if not value:
        return default
    return shlex.split(value)