"""Load and save CaseFile artifacts as JSON.

Sharing a case means sharing the generated artifact, not a seed: model generation is
not bit-deterministic, so the JSON is the portable, reproducible unit.
"""

from __future__ import annotations

from pathlib import Path

from ..schemas.case import CaseFile
from .paths import runtime_cases_dir, seed_case_path


def save_case(case: CaseFile, path: Path) -> Path:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(case.model_dump_json(indent=2), encoding="utf-8")
    return path


def load_case(path: Path) -> CaseFile:
    return CaseFile.model_validate_json(path.read_text(encoding="utf-8"))


def save_runtime_case(case: CaseFile) -> Path:
    return save_case(case, runtime_cases_dir() / f"{case.case_id}.json")


def load_seed_case(name: str) -> CaseFile:
    path = seed_case_path(name)
    if not path.exists():
        raise FileNotFoundError(f"seed case not found: {path}")
    return load_case(path)