"""Explicit original-language requests without changing shared quality defaults."""
import asyncio
import copy
import hashlib
import json
import re

import httpx

from fastapi import HTTPException

_profile_lock = asyncio.Lock()
_prefix = "Magent Original "


def language_info(details):
    code = str(details.get("originalLanguage") or details.get("original_language") or "").lower()
    if not re.fullmatch(r"[a-z]{2}", code) or code in {"en", "xx", "zz"}:
        return None
    return {"code": code}


def profile_body(profile):
    return {key: copy.deepcopy(value) for key, value in profile.items() if key not in {"id", "name"}}


def profile_name(body):
    return _prefix + hashlib.sha256(json.dumps(body, sort_keys=True).encode()).hexdigest()[:16]


def is_original_profile(profile):
    return ((profile.get("language") or {}).get("id") == -2
            and profile.get("name") == profile_name(profile_body(profile)))


async def original_profile(client, default_id):
    # Reuse immutable copies; never edit a profile already used by other titles.
    async with _profile_lock:
        try:
            profiles = await client.get_quality_profiles()
        except httpx.HTTPError as exc:
            raise HTTPException(502, "Radarr could not load the language profile. Try again.") from exc
        if not isinstance(profiles, list):
            raise HTTPException(502, "Radarr returned invalid quality profiles.")
        default = next((p for p in profiles if p.get("id") == default_id), None)
        if not default:
            raise HTTPException(409, "The default quality profile changed. Reload the request.")
        body = profile_body(default)
        body["language"] = {"id": -2, "name": "Original"}
        name = profile_name(body)
        match = next((p for p in profiles if p.get("name") == name and profile_body(p) == body), None)
        if match:
            return match["id"]
        try:
            result = await client.post("/api/v3/qualityprofile", payload={**body, "name": name})
        except httpx.HTTPError as exc:
            raise HTTPException(502, "Radarr could not prepare the original-language profile. Try again.") from exc
        if not isinstance(result, dict) or not isinstance(result.get("id"), int):
            raise HTTPException(502, "Radarr could not prepare the original-language profile. Try again.")
        return result["id"]