from __future__ import annotations

from pathlib import Path
from typing import Dict

from core.settings import (
    AGENT_MD_TEMPLATES_FILE,
    DATA_ROOT,
    RUNTIME_SKILLS_ROOT,
    RUNTIME_TEMPLATES_ROOT,
    TOPIC_PRESETS_TEMPLATES_FILE,
)


def _require_dir(path: Path, *, label: str) -> str:
    resolved = path.resolve()
    if not resolved.exists() or not resolved.is_dir():
        raise RuntimeError(
            f"Missing required {label} directory: {resolved}. "
            "Please mount the project-root data directory to /app/data before starting the backend."
        )
    return str(resolved)


def _require_file(path: Path, *, label: str) -> str:
    resolved = path.resolve()
    if not resolved.exists() or not resolved.is_file():
        raise RuntimeError(
            f"Missing required {label} file: {resolved}. "
            "Please restore the tracked files under data/templates before starting the backend."
        )
    return str(resolved)


def validate_runtime_data_assets() -> Dict[str, str]:
    return {
        "data_root": _require_dir(Path(DATA_ROOT), label="data"),
        "templates_root": _require_dir(RUNTIME_TEMPLATES_ROOT, label="templates"),
        "skills_root": _require_dir(RUNTIME_SKILLS_ROOT, label="skills"),
        "agent_md_templates_file": _require_file(AGENT_MD_TEMPLATES_FILE, label="agent templates"),
        "topic_presets_file": _require_file(TOPIC_PRESETS_TEMPLATES_FILE, label="topic presets"),
    }