"""Application-local runtime; a bundle never falls back to tools on PATH."""
from __future__ import annotations
import json
import os
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent
PRODUCT = "YouTubeDL.Helper"


def manifest():
    path = ROOT / "bundle.json"
    if not path.is_file():
        return None
    value = json.loads(path.read_text(encoding="utf-8"))
    if value.get("product") != PRODUCT or value.get("mode") != "autonomous":
        raise ValueError("Повреждён комплект помощника. Повторите установку.")
    return value


def executable(name):
    bundle = manifest()
    if not bundle:
        return None
    relative = bundle.get("tools", {}).get(name)
    if not isinstance(relative, str):
        raise ValueError(f"В комплекте отсутствует {name}. Повторите установку помощника.")
    candidate = (ROOT / relative).resolve()
    if ROOT not in candidate.parents or not candidate.is_file():
        raise ValueError(f"Встроенный {name} повреждён. Повторите установку помощника.")
    return str(candidate)


def installation_root():
    # The installer puts each complete release under <application>/releases/<id>.
    if manifest() and ROOT.parent.name == "releases":
        return ROOT.parent.parent
    return None


def history_path():
    installed = installation_root()
    return (installed / "data" if installed else ROOT / ".runtime") / "completed-jobs.json"


def information():
    bundle = manifest()
    return {"mode": "autonomous" if bundle else "source", "version": bundle.get("version") if bundle else None,
            "updateTogether": bool(bundle)}